/// <summary>
/// Method is used by Copy and Move to avoid duplicate code
/// </summary>
/// <param name="location">Location where value should be</param>
/// <param name="objectToGetValueFrom">Object to inspect for the desired value</param>
/// <param name="operationToReport">Operation to report in case of an error</param>
/// <returns>GetValueResult containing value and a bool signifying a possible error</returns>
private GetValueResult GetValueAtLocation(
string location,
object objectToGetValueFrom,
Operation operationToReport)
{
if (location == null)
{
throw new ArgumentNullException(nameof(location));
}
if (objectToGetValueFrom == null)
{
throw new ArgumentNullException(nameof(objectToGetValueFrom));
}
if (operationToReport == null)
{
throw new ArgumentNullException(nameof(operationToReport));
}
// get path result
var pathResult = GetActualPropertyPath(
location,
objectToGetValueFrom,
operationToReport);
if (pathResult == null)
{
return(new GetValueResult(null, true));
}
var getAtEndOfList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var treeAnalysisResult = new ObjectTreeAnalysisResult(
objectToGetValueFrom,
actualPathToProperty,
ContractResolver);
if (treeAnalysisResult.UseDynamicLogic)
{
// if it's not an array, we can remove the property from
// the dictionary. If it's an array, we need to check the position first.
if (getAtEndOfList || positionAsInteger > -1)
{
var propertyValue = treeAnalysisResult.Container
.GetValueForCaseInsensitiveKey(treeAnalysisResult.PropertyPathInParent);
// we cannot continue when the value is null, because to be able to
// continue we need to be able to check if the array is a non-string array
if (propertyValue == null)
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatCannotDeterminePropertyType(location)));
return(new GetValueResult(null, true));
}
var typeOfPathProperty = propertyValue.GetType();
if (!IsNonStringArray(typeOfPathProperty))
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, location)));
return(new GetValueResult(null, true));
}
// get the array
var array = (IList)treeAnalysisResult.Container.GetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent);
if (positionAsInteger >= array.Count)
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
location)));
return(new GetValueResult(null, true));
}
if (getAtEndOfList)
{
return(new GetValueResult(array[array.Count - 1], false));
}
else
{
return(new GetValueResult(array[positionAsInteger], false));
}
}
else
{
// get the property
var propertyValueAtLocation = treeAnalysisResult.Container.GetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent);
return(new GetValueResult(propertyValueAtLocation, false));
}
}
else
{
// not dynamic
var patchProperty = treeAnalysisResult.JsonPatchProperty;
if (getAtEndOfList || positionAsInteger > -1)
{
if (!IsNonStringArray(patchProperty.Property.PropertyType))
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, location)));
return(new GetValueResult(null, true));
}
if (!patchProperty.Property.Readable)
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatCannotReadProperty(location)));
return(new GetValueResult(null, true));
}
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (positionAsInteger >= array.Count)
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
location)));
return(new GetValueResult(null, true));
}
if (getAtEndOfList)
{
return(new GetValueResult(array[array.Count - 1], false));
}
else
{
return(new GetValueResult(array[positionAsInteger], false));
}
}
else
{
if (!patchProperty.Property.Readable)
{
LogError(new JsonPatchError(
objectToGetValueFrom,
operationToReport,
Resources.FormatCannotReadProperty(
location)));
return(new GetValueResult(null, true));
}
var propertyValueAtLocation = patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
return(new GetValueResult(propertyValueAtLocation, false));
}
}
}
/// <summary>
/// Add is used by various operations (eg: add, copy, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error
/// </summary>
private void Add(
string path,
object value,
object objectToApplyTo,
Operation operationToReport)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
if (objectToApplyTo == null)
{
throw new ArgumentNullException(nameof(objectToApplyTo));
}
if (operationToReport == null)
{
throw new ArgumentNullException(nameof(operationToReport));
}
// first up: if the path ends in a numeric value, we're inserting in a list and
// that value represents the position; if the path ends in "-", we're appending
// to the list.
// get path result
var pathResult = GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport);
if (pathResult == null)
{
return;
}
var appendList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var treeAnalysisResult = new ObjectTreeAnalysisResult(
objectToApplyTo,
actualPathToProperty,
ContractResolver);
if (!treeAnalysisResult.IsValidPathForAdd)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatPropertyCannotBeAdded(path)));
return;
}
if (treeAnalysisResult.UseDynamicLogic)
{
var container = treeAnalysisResult.Container;
if (container.ContainsCaseInsensitiveKey(treeAnalysisResult.PropertyPathInParent))
{
// Existing property.
// If it's not an array, we need to check if the value fits the property type
//
// If it's an array, we need to check if the value fits in that array type,
// and add it at the correct position (if allowed).
if (appendList || positionAsInteger > -1)
{
// get the actual type
var propertyValue = container.GetValueForCaseInsensitiveKey(treeAnalysisResult.PropertyPathInParent);
var typeOfPathProperty = propertyValue.GetType();
if (!IsNonStringArray(typeOfPathProperty))
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, path)));
return;
}
// now, get the generic type of the enumerable
var genericTypeOfArray = GetIListType(typeOfPathProperty);
var conversionResult = ConvertToActualType(genericTypeOfArray, value);
if (!conversionResult.CanBeConverted)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidValueForProperty(value, path)));
return;
}
// get value (it can be cast, we just checked that)
var array = treeAnalysisResult.Container.GetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent) as IList;
if (appendList)
{
array.Add(conversionResult.ConvertedInstance);
treeAnalysisResult.Container.SetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent, array);
}
else
{
// specified index must not be greater than
// the amount of items in the array
if (positionAsInteger > array.Count)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
path)));
return;
}
array.Insert(positionAsInteger, conversionResult.ConvertedInstance);
treeAnalysisResult.Container.SetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent, array);
}
}
else
{
// get the actual type
var typeOfPathProperty = treeAnalysisResult.Container
.GetValueForCaseInsensitiveKey(treeAnalysisResult.PropertyPathInParent).GetType();
// can the value be converted to the actual type?
var conversionResult = ConvertToActualType(typeOfPathProperty, value);
if (conversionResult.CanBeConverted)
{
treeAnalysisResult.Container.SetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent,
conversionResult.ConvertedInstance);
}
else
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidValueForProperty(conversionResult.ConvertedInstance, path)));
return;
}
}
}
else
{
// New property - add it.
treeAnalysisResult.Container.Add(treeAnalysisResult.PropertyPathInParent, value);
}
}
else
{
// If it's an array, add to that array. If it's not, we replace.
// is the path an array (but not a string (= char[]))? In this case,
// the path must end with "/position" or "/-", which we already determined before.
var patchProperty = treeAnalysisResult.JsonPatchProperty;
if (appendList || positionAsInteger > -1)
{
if (!IsNonStringArray(patchProperty.Property.PropertyType))
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, path)));
return;
}
// now, get the generic type of the IList<> from Property type.
var genericTypeOfArray = GetIListType(patchProperty.Property.PropertyType);
var conversionResult = ConvertToActualType(genericTypeOfArray, value);
if (!conversionResult.CanBeConverted)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidValueForProperty(conversionResult.ConvertedInstance, path)));
return;
}
if (!patchProperty.Property.Readable)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatCannotReadProperty(path)));
return;
}
var array = (IList)patchProperty.Property.ValueProvider.GetValue(patchProperty.Parent);
if (appendList)
{
array.Add(conversionResult.ConvertedInstance);
}
else if (positionAsInteger <= array.Count)
{
array.Insert(positionAsInteger, conversionResult.ConvertedInstance);
}
else
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, path)));
return;
}
}
else
{
var conversionResultTuple = ConvertToActualType(
patchProperty.Property.PropertyType,
value);
if (!conversionResultTuple.CanBeConverted)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidValueForProperty(value, path)));
return;
}
if (!patchProperty.Property.Writable)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatCannotUpdateProperty(path)));
return;
}
patchProperty.Property.ValueProvider.SetValue(
patchProperty.Parent,
conversionResultTuple.ConvertedInstance);
}
}
}
/// <summary>
/// Remove is used by various operations (eg: remove, move, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error. The return value
/// contains the type of the item that has been removed (and a bool possibly signifying an error)
/// This can be used by other methods, like replace, to ensure that we can pass in the correctly
/// typed value to whatever method follows.
/// </summary>
private RemovedPropertyTypeResult Remove(string path, object objectToApplyTo, Operation operationToReport)
{
// get path result
var pathResult = GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport);
if (pathResult == null)
{
return(new RemovedPropertyTypeResult(null, true));
}
var removeFromList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var treeAnalysisResult = new ObjectTreeAnalysisResult(
objectToApplyTo,
actualPathToProperty,
ContractResolver);
if (!treeAnalysisResult.IsValidPathForRemove)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatPropertyCannotBeRemoved(path)));
return(new RemovedPropertyTypeResult(null, true));
}
if (treeAnalysisResult.UseDynamicLogic)
{
// if it's not an array, we can remove the property from
// the dictionary. If it's an array, we need to check the position first.
if (removeFromList || positionAsInteger > -1)
{
var propertyValue = treeAnalysisResult.Container
.GetValueForCaseInsensitiveKey(treeAnalysisResult.PropertyPathInParent);
// we cannot continue when the value is null, because to be able to
// continue we need to be able to check if the array is a non-string array
if (propertyValue == null)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatCannotDeterminePropertyType(path)));
return(new RemovedPropertyTypeResult(null, true));
}
var typeOfPathProperty = propertyValue.GetType();
if (!IsNonStringArray(typeOfPathProperty))
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, path)));
return(new RemovedPropertyTypeResult(null, true));
}
// now, get the generic type of the enumerable (we'll return this type)
var genericTypeOfArray = GetIListType(typeOfPathProperty);
// get the array
var array = (IList)treeAnalysisResult.Container.GetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent);
if (array.Count == 0)
{
// if the array is empty, we should throw an error
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
path)));
return(new RemovedPropertyTypeResult(null, true));
}
if (removeFromList)
{
array.RemoveAt(array.Count - 1);
treeAnalysisResult.Container.SetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent, array);
// return the type of the value that has been removed.
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
else
{
if (positionAsInteger >= array.Count)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
path)));
return(new RemovedPropertyTypeResult(null, true));
}
array.RemoveAt(positionAsInteger);
treeAnalysisResult.Container.SetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent, array);
// return the type of the value that has been removed.
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
}
else
{
// get the property
var getResult = treeAnalysisResult.Container.GetValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent);
// remove the property
treeAnalysisResult.Container.RemoveValueForCaseInsensitiveKey(
treeAnalysisResult.PropertyPathInParent);
// value is not null, we can determine the type
if (getResult != null)
{
var actualType = getResult.GetType();
return(new RemovedPropertyTypeResult(actualType, false));
}
else
{
return(new RemovedPropertyTypeResult(null, false));
}
}
}
else
{
// not dynamic
var patchProperty = treeAnalysisResult.JsonPatchProperty;
if (removeFromList || positionAsInteger > -1)
{
if (!IsNonStringArray(patchProperty.Property.PropertyType))
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(operationToReport.op, path)));
return(new RemovedPropertyTypeResult(null, true));
}
// now, get the generic type of the IList<> from Property type.
var genericTypeOfArray = GetIListType(patchProperty.Property.PropertyType);
if (!patchProperty.Property.Readable)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatCannotReadProperty(path)));
return(new RemovedPropertyTypeResult(null, true));
}
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (array.Count == 0)
{
// if the array is empty, we should throw an error
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
path)));
return(new RemovedPropertyTypeResult(null, true));
}
if (removeFromList)
{
array.RemoveAt(array.Count - 1);
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
else
{
if (positionAsInteger >= array.Count)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatInvalidIndexForArrayProperty(
operationToReport.op,
path)));
return(new RemovedPropertyTypeResult(null, true));
}
array.RemoveAt(positionAsInteger);
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
}
else
{
if (!patchProperty.Property.Writable)
{
LogError(new JsonPatchError(
objectToApplyTo,
operationToReport,
Resources.FormatCannotUpdateProperty(path)));
return(new RemovedPropertyTypeResult(null, true));
}
// setting the value to "null" will use the default value in case of value types, and
// null in case of reference types
object value = null;
if (patchProperty.Property.PropertyType.GetTypeInfo().IsValueType &&
Nullable.GetUnderlyingType(patchProperty.Property.PropertyType) == null)
{
value = Activator.CreateInstance(patchProperty.Property.PropertyType);
}
patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent, value);
return(new RemovedPropertyTypeResult(patchProperty.Property.PropertyType, false));
}
}
}
/// <summary>
/// Add is used by various operations (eg: add, copy, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error
/// </summary>
private void Add(string path, object value, object objectToApplyTo, Operation operationToReport)
{
// add, in this implementation, CAN add properties if the container is an
// ExpandoObject.
// first up: if the path ends in a numeric value, we're inserting in a list and
// that value represents the position; if the path ends in "-", we're appending
// to the list.
// get path result
var pathResult = PropertyHelpers.GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport,
true);
var appendList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var result = new ObjectTreeAnalysisResult(objectToApplyTo, actualPathToProperty, ContractResolver);
if (result.UseDynamicLogic)
{
if (result.IsValidPathForAdd)
{
if (result.Container.ContainsCaseInsensitiveKey(result.PropertyPathInParent))
{
// Existing property.
// If it's not an array, we need to check if the value fits the property type
//
// If it's an array, we need to check if the value fits in that array type,
// and add it at the correct position (if allowed).
if (appendList || positionAsInteger > -1)
{
// get the actual type
var typeOfPathProperty = result.Container
.GetValueForCaseInsensitiveKey(result.PropertyPathInParent).GetType();
if (PropertyHelpers.IsNonStringArray(typeOfPathProperty))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetIListType(typeOfPathProperty);
var conversionResult = PropertyHelpers.ConvertToActualType(genericTypeOfArray, value);
if (!conversionResult.CanBeConverted)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided value is invalid for array property type at location path: {0}", path)),
422);
}
// get value (it can be cast, we just checked that)
// var array = containerDictionary[finalPath] as IList;
var array = result.Container.GetValueForCaseInsensitiveKey(result.PropertyPathInParent) as IList;
if (appendList)
{
array.Add(conversionResult.ConvertedInstance);
result.Container.SetValueForCaseInsensitiveKey(result.PropertyPathInParent, array);
}
else
{
// specified index must not be greater than
// the amount of items in the array
if (positionAsInteger > array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.Insert(positionAsInteger, conversionResult.ConvertedInstance);
result.Container.SetValueForCaseInsensitiveKey(
result.PropertyPathInParent, array);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array", path)),
422);
}
}
else
{
// get the actual type
var typeOfPathProperty = result.Container.GetValueForCaseInsensitiveKey(result.PropertyPathInParent).GetType();
// can the value be converted to the actual type?
var conversionResultTuple =
PropertyHelpers.ConvertToActualType(typeOfPathProperty, value);
// conversion successful
if (conversionResultTuple.CanBeConverted)
{
result.Container.SetValueForCaseInsensitiveKey(result.PropertyPathInParent,
conversionResultTuple.ConvertedInstance);
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided value is invalid for property type at location path: {0}", path)),
422);
}
}
}
else
{
// New property - add it.
result.Container.Add(result.PropertyPathInParent, value);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot add to the parent of the property at location path: {0}. To be able to dynamically add properties, the parent must be an ExpandoObject.", path)),
422);
}
}
else
{
if (!result.IsValidPathForAdd)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: the provided path is invalid: {0}.", path)),
422);
}
// If it' an array, add to that array. If it's not, we replace.
// is the path an array (but not a string (= char[]))? In this case,
// the path must end with "/position" or "/-", which we already determined before.
var patchProperty = result.JsonPatchProperty;
if (appendList || positionAsInteger > -1)
{
if (PropertyHelpers.IsNonStringArray(patchProperty.Property.PropertyType))
{
// now, get the generic type of the IList<> from Property type.
var genericTypeOfArray = PropertyHelpers.GetIListType(patchProperty.Property.PropertyType);
var conversionResult = PropertyHelpers.ConvertToActualType(genericTypeOfArray, value);
if (!conversionResult.CanBeConverted)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided value is invalid for array property type at location path: {0}", path)),
422);
}
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (appendList)
{
array.Add(conversionResult.ConvertedInstance);
}
else
{
// specified index must not be greater than the amount of items in the
// array
if (positionAsInteger <= array.Count)
{
array.Insert(positionAsInteger, conversionResult.ConvertedInstance);
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
}
}
else
{
// cannot read the property
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array", path)),
422);
}
}
else
{
var conversionResultTuple = PropertyHelpers.ConvertToActualType(
patchProperty.Property.PropertyType,
value);
if (conversionResultTuple.CanBeConverted)
{
if (patchProperty.Property.Writable)
{
patchProperty.Property.ValueProvider.SetValue(
patchProperty.Parent,
conversionResultTuple.ConvertedInstance);
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property at path location cannot be set: {0}. Possible causes: the property may not have an accessible setter, or the property may be part of an anonymous object (and thus cannot be changed after initialization).", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property value cannot be converted to type of path location {0}.", path)),
422);
}
}
}
}
private GetValueResult GetValueAtLocation(string location, object objectToGetValueFrom, Operation operationToReport)
{
// get value from "objectToGetValueFrom" at location "location"
object valueAtLocation = null;
var pathResult = PropertyHelpers.GetActualPropertyPath(
location,
objectToGetValueFrom,
operationToReport, false);
var positionAsInteger = pathResult.NumericEnd;
var actualFromProperty = pathResult.PathToProperty;
// first, analyze the tree.
var result = new ObjectTreeAnalysisResult(objectToGetValueFrom, actualFromProperty, ContractResolver);
if (result.UseDynamicLogic)
{
// find the property
if (result.Container.ContainsCaseInsensitiveKey(result.PropertyPathInParent))
{
if (positionAsInteger > -1)
{
// get the actual type
var typeOfPathProperty = result.Container
.GetValueForCaseInsensitiveKey(result.PropertyPathInParent).GetType();
if (PropertyHelpers.IsNonStringArray(typeOfPathProperty))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetIListType(typeOfPathProperty);
// get value
var array = result.Container.GetValueForCaseInsensitiveKey(result.PropertyPathInParent) as IList;
if (positionAsInteger >= array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: property at location from: {0} does not exist", location)),
422);
}
valueAtLocation = array[positionAsInteger];
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: provided from path is invalid for array property type at location from: {0}: expected array", location)),
422);
}
}
else
{
// get the value
valueAtLocation =
result.Container.GetValueForCaseInsensitiveKey(result.PropertyPathInParent);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: property at location from: {0} does not exist.", location)),
422);
}
}
else
{
// not dynamic.
var patchProperty = result.JsonPatchProperty;
// is the path an array (but not a string (= char[]))? In this case,
// the path must end with "/position" or "/-", which we already determined before.
if (positionAsInteger > -1)
{
if (PropertyHelpers.IsNonStringArray(patchProperty.Property.PropertyType))
{
// now, get the generic type of the enumerable
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (positionAsInteger >= array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: property at location from: {0} does not exist", location)),
422);
}
valueAtLocation = array[positionAsInteger];
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: cannot get property at location from from: {0}. Possible cause: the property doesn't have an accessible getter.", location)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: provided from path is invalid for array property type at location from: {0}: expected array", location)),
422);
}
}
else
{
if (!patchProperty.Property.Readable)
{
throw new JsonPatchException(
new JsonPatchError(
objectToGetValueFrom,
operationToReport,
string.Format("Patch failed: cannot get property at location from from: {0}. Possible cause: the property doesn't have an accessible getter.", location)),
422);
}
valueAtLocation = patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
}
}
return(new GetValueResult(valueAtLocation, false));
}
/// <summary>
/// Remove is used by various operations (eg: remove, move, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error. The return value
/// contains the type of the item that has been removed (and a bool possibly signifying an error)
/// This can be used by other methods, like replace, to ensure that we can pass in the correctly
/// typed value to whatever method follows.
/// </summary>
private RemovedPropertyTypeResult Remove(string path, object objectToApplyTo, Operation operationToReport)
{
// remove, in this implementation, CAN remove properties if the container is an
// ExpandoObject.
var pathResult = PropertyHelpers.GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport,
true);
var removeFromList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var result = new ObjectTreeAnalysisResult(objectToApplyTo, actualPathToProperty, ContractResolver);
if (result.UseDynamicLogic)
{
if (result.IsValidPathForRemove)
{
// if it's not an array, we can remove the property from
// the dictionary. If it's an array, we need to check the position first.
if (removeFromList || positionAsInteger > -1)
{
var valueOfPathProperty = result.Container
.GetValueForCaseInsensitiveKey(result.PropertyPathInParent);
// we cannot continue when the value is null, because to be able to
// continue we need to be able to check if the array is a non-string array
if (valueOfPathProperty == null)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot determine array property type at location path: {0}.", path)),
422);
}
var typeOfPathProperty = valueOfPathProperty.GetType();
if (PropertyHelpers.IsNonStringArray(typeOfPathProperty))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetIListType(typeOfPathProperty);
var array = (IList)result.Container.GetValueForCaseInsensitiveKey(result.PropertyPathInParent);
if (removeFromList)
{
if (array.Count == 0)
{
// if the array is empty, we should throw an error
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.RemoveAt(array.Count - 1);
result.Container.SetValueForCaseInsensitiveKey(result.PropertyPathInParent, array);
// return the type of the value that has been removed.
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
else
{
if (positionAsInteger >= array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.RemoveAt(positionAsInteger);
result.Container.SetValueForCaseInsensitiveKey(result.PropertyPathInParent, array);
// return the type of the value that has been removed.
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array", path)),
422);
}
}
else
{
// get the property
var getResult = result.Container.GetValueForCaseInsensitiveKey(result.PropertyPathInParent);
// remove the property
result.Container.RemoveValueForCaseInsensitiveKey(result.PropertyPathInParent);
// value is not null, we can determine the type
if (getResult != null)
{
var actualType = getResult.GetType();
return(new RemovedPropertyTypeResult(actualType, false));
}
else
{
return(new RemovedPropertyTypeResult(null, false));
}
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot remove property at location path: {0}. To be able to dynamically remove properties, the parent must be an ExpandoObject.", path)),
422);
}
}
else
{
// not dynamic
if (!result.IsValidPathForRemove)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: the provided path is invalid: {0}.", path)),
422);
}
var patchProperty = result.JsonPatchProperty;
if (removeFromList || positionAsInteger > -1)
{
if (PropertyHelpers.IsNonStringArray(patchProperty.Property.PropertyType))
{
// now, get the generic type of the IList<> from Property type.
var genericTypeOfArray = PropertyHelpers.GetIListType(patchProperty.Property.PropertyType);
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (removeFromList)
{
if (array.Count == 0)
{
// if the array is empty, we should throw an error
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.RemoveAt(array.Count - 1);
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
else
{
if (positionAsInteger >= array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.RemoveAt(positionAsInteger);
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array.", path)),
422);
}
}
else
{
if (!patchProperty.Property.Writable)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property at path location cannot be set: {0}. Possible causes: the property may not have an accessible setter, or the property may be part of an anonymous object (and thus cannot be changed after initialization).", path)),
422);
}
// setting the value to "null" will use the default value in case of value types, and
// null in case of reference types
object value = null;
if (patchProperty.Property.PropertyType.GetTypeInfo().IsValueType &&
Nullable.GetUnderlyingType(patchProperty.Property.PropertyType) == null)
{
value = Activator.CreateInstance(patchProperty.Property.PropertyType);
}
patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent, value);
return(new RemovedPropertyTypeResult(patchProperty.Property.PropertyType, false));
}
}
}
/// <summary>
/// Remove is used by various operations (eg: remove, move, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error
/// </summary>
private RemovedPropertyTypeResult Remove(string path, T objectToApplyTo, Operation <T> operationToReport)
{
// get path result
var pathResult = PropertyHelpers.GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport,
false);
var removeFromList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var expressionToUse = pathResult.ExpressionEnd;
var result = new ObjectTreeAnalysisResult(objectToApplyTo, actualPathToProperty,
ContractResolver);
if (!result.IsValidPathForRemove)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: the provided path is invalid: {0}.", path)),
422);
}
var patchProperty = result.JsonPatchProperty;
if (removeFromList || positionAsInteger > -1)
{
if (expressionToUse != null)
{
// we have an expression.
var elementType = PropertyHelpers.GetCollectionType(patchProperty.Property.PropertyType);
object coll = patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
var remMethod = typeof(ICollection <>).MakeGenericType(elementType).GetMethod("Remove");
var objToRemove = ExpressionHelpers.GetElementAtFromObjectExpression(coll, expressionToUse);
var remResult = remMethod.Invoke(coll, new object[] { objToRemove });
if ((bool)remResult != true)
{
throw new Exception("D'oh");
}
return(new RemovedPropertyTypeResult(elementType, false));
}
else if (PropertyHelpers.IsNonStringList(patchProperty.Property.PropertyType))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetEnumerableType(patchProperty.Property.PropertyType);
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (removeFromList)
{
if (array.Count == 0)
{
// if the array is empty, we should throw an error
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
//NewValue = conversionResultTuple.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property,
Index = array.Count - 1,
};
InvokeWithBeforeSetValue(eArg, () => array.RemoveAt(eArg.Index.Value));
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
else
{
if (positionAsInteger >= array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
//NewValue = conversionResultTuple.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property,
Index = positionAsInteger
};
InvokeWithBeforeSetValue(eArg, () => array.RemoveAt(eArg.Index.Value));
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array.", path)),
422);
}
}
else
{
if (!patchProperty.Property.Writable)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property at path location cannot be set: {0}. Possible causes: the property may not have an accessible setter, or the property may be part of an anonymous object (and thus cannot be changed after initialization).", path)),
422);
}
// set value to null, or for non-nullable value types, to its default value.
object value = null;
if (patchProperty.Property.PropertyType.GetType().IsValueType &&
Nullable.GetUnderlyingType(patchProperty.Property.PropertyType) == null)
{
value = Activator.CreateInstance(patchProperty.Property.PropertyType);
}
// check if it can be converted.
var conversionResultTuple = PropertyHelpers.ConvertToActualType(
patchProperty.Property.PropertyType,
value);
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
//NewValue = conversionResultTuple.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property,
IsRemoveStepOfReplace = operationToReport.OperationType == OperationType.Replace
};
if (!conversionResultTuple.CanBeConverted)
{
// conversion failed, so use reflection (somewhat slower) to
// create a new default instance of the property type to set as value
eArg.NewValue = Activator.CreateInstance(patchProperty.Property.PropertyType);
//patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent,
// Activator.CreateInstance(patchProperty.Property.PropertyType));
//return new RemovedPropertyTypeResult(patchProperty.Property.PropertyType, false);
}
else
{
eArg.NewValue = conversionResultTuple.ConvertedInstance;
}
InvokeWithBeforeSetValue(eArg, () => patchProperty.Property.ValueProvider.SetValue(eArg.ParentObject,
eArg.NewValue));
return(new RemovedPropertyTypeResult(patchProperty.Property.PropertyType, false));
}
}
/// <summary>
/// Add is used by various operations (eg: add, copy, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error
/// </summary>
private void Add(string path, object value, T objectToApplyTo, Operation <T> operationToReport)
{
// add, in this implementation, does not just "add" properties - that's
// technically impossible; It can however be used to add items to arrays,
// or to replace values.
// first up: if the path ends in a numeric value, we're inserting in a list and
// that value represents the position; if the path ends in "-", we're appending
// to the list.
// get path result
var pathResult = PropertyHelpers.GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport,
true);
var appendList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var result = new ObjectTreeAnalysisResult(objectToApplyTo, actualPathToProperty, ContractResolver);
if (!result.IsValidPathForAdd)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: the provided path is invalid: {0}.", path)),
422);
}
// If it' an array, add to that array. If it's not, we replace.
// is the path an array (but not a string (= char[]))? In this case,
// the path must end with "/position" or "/-", which we already determined before.
var patchProperty = result.JsonPatchProperty;
if (appendList || positionAsInteger > -1)
{
if (PropertyHelpers.IsNonStringList(patchProperty.Property.PropertyType))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetEnumerableType(patchProperty.Property.PropertyType);
var conversionResult = PropertyHelpers.ConvertToActualType(genericTypeOfArray, value);
if (!conversionResult.CanBeConverted)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided value is invalid for array property type at location path: {0}", path)),
422);
}
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (array == null)
{
array = (IList)Activator.CreateInstance(typeof(List <>).MakeGenericType(genericTypeOfArray));
patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent, array);
}
if (appendList)
{
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
Index = array.Count + 1,
NewValue = conversionResult.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property
};
InvokeWithBeforeSetValue(eArg, () => array.Add(eArg.NewValue));
}
else
{
// specified index must not be greater than the amount of items in the
// array
if (positionAsInteger <= array.Count)
{
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
Index = positionAsInteger,
NewValue = conversionResult.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property
};
InvokeWithBeforeSetValue(eArg, () => array.Insert(positionAsInteger, eArg.NewValue));
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
}
}
else
{
// cannot read the property
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else if (PropertyHelpers.IsNonStringCollection(patchProperty.Property.PropertyType))
{
// we need to do a little work with collections here. All generic collections have an "Add" operation. In this case, we should ONLY
// support adding to the end.
if (!(positionAsInteger == -1 || appendList))
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: can only insert at end of array when target type is ICollection", path)),
422);
}
var genericTypeOfCollection = PropertyHelpers.GetEnumerableType(patchProperty.Property.PropertyType);
ConversionResult conversionResult;// = PropertyHelpers.ConvertToActualType(genericTypeOfCollection, value);
if (!genericTypeOfCollection.IsValueType && genericTypeOfCollection != typeof(string) && value != null && value.GetType() == typeof(string))
{
object newObj;
if (CustomDeserializationHandler != null)
{
newObj = CustomDeserializationHandler(value.ToString(), genericTypeOfCollection);
}
else
{
newObj = JsonConvert.DeserializeObject(value.ToString(), genericTypeOfCollection);
}
conversionResult = new ConversionResult(true, newObj);
}
else if (value != null && genericTypeOfCollection.IsAssignableFrom(value.GetType()))
{
conversionResult = new ConversionResult(true, value);
}
else
{
conversionResult = PropertyHelpers.ConvertToActualType(
genericTypeOfCollection,
value);
}
if (!conversionResult.CanBeConverted)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided value is invalid for array property type at location path: {0}", path)),
422);
}
if (patchProperty.Property.Readable)
{
var array = patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (array == null)
{
// the array was null. This might mean we are dealing with a fresh object. This is okay. Lets initialize it with a basic collection.
array = Activator.CreateInstance(typeof(Collection <>).MakeGenericType(genericTypeOfCollection));
patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent, array);
}
var addMethod = patchProperty.Property.PropertyType.GetMethod("Add");
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
Index = -1,
NewValue = conversionResult.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property
};
InvokeWithBeforeSetValue(eArg, () => addMethod.Invoke(array, new object[] { eArg.NewValue }));
}
else
{
// cannot read the property
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array", path)),
422);
}
}
else
{
Type propType = patchProperty.Property.PropertyType;
ConversionResult conversionResultTuple;
if (!propType.IsValueType && propType != typeof(string) && value != null && value.GetType() == typeof(string))
{
object newObj;
if (CustomDeserializationHandler != null)
{
newObj = CustomDeserializationHandler(value.ToString(), propType);
}
else
{
newObj = JsonConvert.DeserializeObject(value.ToString(), propType);
}
conversionResultTuple = new ConversionResult(true, newObj);
}
else if (value != null && patchProperty.Property.PropertyType.IsAssignableFrom(value.GetType()))
{
conversionResultTuple = new ConversionResult(true, value);
}
else
{
conversionResultTuple = PropertyHelpers.ConvertToActualType(
patchProperty.Property.PropertyType,
value);
}
if (conversionResultTuple.CanBeConverted)
{
if (patchProperty.Property.Writable)
{
SetValueEventArgs eArg = new SetValueEventArgs(operationToReport)
{
Cancel = false,
NewValue = conversionResultTuple.ConvertedInstance,
ParentObject = patchProperty.Parent,
Property = patchProperty.Property
};
InvokeWithBeforeSetValue(eArg, () => patchProperty.Property.ValueProvider.SetValue(
eArg.ParentObject,
eArg.NewValue));
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property at path location cannot be set: {0}. Possible causes: the property may not have an accessible setter, or the property may be part of an anonymous object (and thus cannot be changed after initialization).", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property value cannot be converted to type of path location {0}.", path)),
422);
}
}
}
/// <summary>
/// Remove is used by various operations (eg: remove, move, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error
/// </summary>
private RemovedPropertyTypeResult Remove(string path, T objectToApplyTo, Operation <T> operationToReport)
{
// get path result
var pathResult = PropertyHelpers.GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport,
false);
var removeFromList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var result = new ObjectTreeAnalysisResult(objectToApplyTo, actualPathToProperty,
ContractResolver);
if (!result.IsValidPathForRemove)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: the provided path is invalid: {0}.", path)),
422);
}
var patchProperty = result.JsonPatchProperty;
if (removeFromList || positionAsInteger > -1)
{
if (PropertyHelpers.IsNonStringList(patchProperty.Property.PropertyType))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetEnumerableType(patchProperty.Property.PropertyType);
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (removeFromList)
{
if (array.Count == 0)
{
// if the array is empty, we should throw an error
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.RemoveAt(array.Count - 1);
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
else
{
if (positionAsInteger >= array.Count)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
array.RemoveAt(positionAsInteger);
// return the type of the value that has been removed
return(new RemovedPropertyTypeResult(genericTypeOfArray, false));
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array.", path)),
422);
}
}
else
{
if (!patchProperty.Property.Writable)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property at path location cannot be set: {0}. Possible causes: the property may not have an accessible setter, or the property may be part of an anonymous object (and thus cannot be changed after initialization).", path)),
422);
}
// set value to null, or for non-nullable value types, to its default value.
object value = null;
if (patchProperty.Property.PropertyType.GetType().IsValueType &&
Nullable.GetUnderlyingType(patchProperty.Property.PropertyType) == null)
{
value = Activator.CreateInstance(patchProperty.Property.PropertyType);
}
// check if it can be converted.
var conversionResultTuple = PropertyHelpers.ConvertToActualType(
patchProperty.Property.PropertyType,
value);
if (!conversionResultTuple.CanBeConverted)
{
// conversion failed, so use reflection (somewhat slower) to
// create a new default instance of the property type to set as value
patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent,
Activator.CreateInstance(patchProperty.Property.PropertyType));
return(new RemovedPropertyTypeResult(patchProperty.Property.PropertyType, false));
}
patchProperty.Property.ValueProvider.SetValue(patchProperty.Parent,
conversionResultTuple.ConvertedInstance);
return(new RemovedPropertyTypeResult(patchProperty.Property.PropertyType, false));
}
}
/// <summary>
/// Add is used by various operations (eg: add, copy, ...), yet through different operations;
/// This method allows code reuse yet reporting the correct operation on error
/// </summary>
private void Add(string path, object value, T objectToApplyTo, Operation <T> operationToReport)
{
// add, in this implementation, does not just "add" properties - that's
// technically impossible; It can however be used to add items to arrays,
// or to replace values.
// first up: if the path ends in a numeric value, we're inserting in a list and
// that value represents the position; if the path ends in "-", we're appending
// to the list.
// get path result
var pathResult = PropertyHelpers.GetActualPropertyPath(
path,
objectToApplyTo,
operationToReport,
true);
var appendList = pathResult.ExecuteAtEnd;
var positionAsInteger = pathResult.NumericEnd;
var actualPathToProperty = pathResult.PathToProperty;
var result = new ObjectTreeAnalysisResult(objectToApplyTo, actualPathToProperty, ContractResolver);
if (!result.IsValidPathForAdd)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: the provided path is invalid: {0}.", path)),
422);
}
// If it' an array, add to that array. If it's not, we replace.
// is the path an array (but not a string (= char[]))? In this case,
// the path must end with "/position" or "/-", which we already determined before.
var patchProperty = result.JsonPatchProperty;
if (appendList || positionAsInteger > -1)
{
if (PropertyHelpers.IsNonStringList(patchProperty.Property.PropertyType))
{
// now, get the generic type of the enumerable
var genericTypeOfArray = PropertyHelpers.GetEnumerableType(patchProperty.Property.PropertyType);
var conversionResult = PropertyHelpers.ConvertToActualType(genericTypeOfArray, value);
if (!conversionResult.CanBeConverted)
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided value is invalid for array property type at location path: {0}", path)),
422);
}
if (patchProperty.Property.Readable)
{
var array = (IList)patchProperty.Property.ValueProvider
.GetValue(patchProperty.Parent);
if (appendList)
{
array.Add(conversionResult.ConvertedInstance);
}
else
{
// specified index must not be greater than the amount of items in the
// array
if (positionAsInteger <= array.Count)
{
array.Insert(positionAsInteger, conversionResult.ConvertedInstance);
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: position larger than array size", path)),
422);
}
}
}
else
{
// cannot read the property
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: cannot get property value at path {0}. Possible cause: the property doesn't have an accessible getter.", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: provided path is invalid for array property type at location path: {0}: expected array", path)),
422);
}
}
else
{
var conversionResultTuple = PropertyHelpers.ConvertToActualType(
patchProperty.Property.PropertyType,
value);
if (conversionResultTuple.CanBeConverted)
{
if (patchProperty.Property.Writable)
{
patchProperty.Property.ValueProvider.SetValue(
patchProperty.Parent,
conversionResultTuple.ConvertedInstance);
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property at path location cannot be set: {0}. Possible causes: the property may not have an accessible setter, or the property may be part of an anonymous object (and thus cannot be changed after initialization).", path)),
422);
}
}
else
{
throw new JsonPatchException(
new JsonPatchError(
objectToApplyTo,
operationToReport,
string.Format("Patch failed: property value cannot be converted to type of path location {0}.", path)),
422);
}
}
}
