public ObjectTreeAnalysisResult(object objectToSearch, string propertyPath
, IContractResolver contractResolver)
{
// construct the analysis result.
// split the propertypath, and if necessary, remove the first
// empty item (that's the case when it starts with a "/")
var propertyPathTree = propertyPath.Split(
new char[] { '/' },
StringSplitOptions.RemoveEmptyEntries).ToList();
object targetObject = objectToSearch;
// we've now got a split up property tree "base/property/otherproperty/..."
int lastPosition = 0;
for (int i = 0; i < propertyPathTree.Count; i++)
{
// if the current target object is an ExpandoObject (IDictionary<string, object>),
// we cannot use the ContractResolver.
lastPosition = i;
// if the current part of the path is numeric, this means we're trying
// to get the propertyInfo of a specific object in an array. To allow
// for this, the previous value (targetObject) must be an IEnumerable, and
// the position must exist.
int numericValue = -1;
if (int.TryParse(propertyPathTree[i], out numericValue))
{
var element = GetElementAtFromObject(targetObject, numericValue);
if (element != null)
{
targetObject = element;
}
else
{
break;
}
}
else
{
var jsonContract = (JsonObjectContract)contractResolver
.ResolveContract(targetObject.GetType());
// does the property exist?
var attemptedProperty = jsonContract.Properties.FirstOrDefault
(p => string.Equals(p.PropertyName, propertyPathTree[i]
, StringComparison.OrdinalIgnoreCase));
if (attemptedProperty != null)
{
// unless we're at the last item, we should continue searching.
// If we're at the last item, we need to stop
if (!(i == propertyPathTree.Count - 1))
{
targetObject = attemptedProperty.ValueProvider.GetValue(targetObject);
}
}
else
{
// property cannot be found
// Stop, and return invalid path.
break;
}
}
}
var leftOverPath = propertyPathTree
.GetRange(lastPosition, propertyPathTree.Count - lastPosition);
if (leftOverPath.Count == 1)
{
var jsonContract = (JsonObjectContract)contractResolver
.ResolveContract(targetObject.GetType());
var attemptedProperty = jsonContract.Properties.FirstOrDefault
(p => string.Equals(p.PropertyName, leftOverPath.Last()
, StringComparison.OrdinalIgnoreCase));
if (attemptedProperty == null)
{
IsValidPathForAdd = false;
IsValidPathForRemove = false;
}
else
{
IsValidPathForAdd = true;
IsValidPathForRemove = true;
JsonPatchProperty = new Helpers.JsonPatchProperty(attemptedProperty, targetObject);
PropertyPathInParent = leftOverPath.Last();
}
}
else
{
IsValidPathForAdd = false;
IsValidPathForRemove = false;
}
}
public ObjectTreeAnalysisResult(object objectToSearch, string propertyPath
, IContractResolver contractResolver)
{
// construct the analysis result.
// split the propertypath, and if necessary, remove the first
// empty item (that's the case when it starts with a "/")
var propertyPathTree = propertyPath.Split(
new char[] { '/' },
StringSplitOptions.RemoveEmptyEntries).ToList();
object targetObject = objectToSearch;
// we've now got a split up property tree "base/property/otherproperty/..."
int lastPosition = 0;
for (int i = 0; i < propertyPathTree.Count; i++)
{
// if the current target object is an ExpandoObject (IDictionary<string, object>),
// we cannot use the ContractResolver.
lastPosition = i;
// if the current part of the path is numeric, this means we're trying
// to get the propertyInfo of a specific object in an array. To allow
// for this, the previous value (targetObject) must be an IEnumerable, and
// the position must exist.
int numericValue = -1;
if (int.TryParse(propertyPathTree[i], out numericValue))
{
var element = GetElementAtFromObject(targetObject, numericValue);
if (element != null)
{
targetObject = element;
}
else
{
break;
}
}
else if (propertyPathTree[i].StartsWith("[") && propertyPathTree[i].EndsWith("]"))
{
// we are going to try a bit of bullshittery here.
// i would use something like dynamic linq, but this is a portable library. When i have time, i will split this out. Until then:
string exprString = propertyPathTree[i].Substring(1, propertyPathTree[i].Length - 2);
var element = ExpressionHelpers.GetElementAtFromObjectExpression(targetObject, exprString);
if (element != null)
{
targetObject = element;
}
else
{
break;
}
}
else
{
var jsonContract = (JsonObjectContract)contractResolver
.ResolveContract(targetObject.GetType());
// does the property exist?
var attemptedProperty = jsonContract.Properties.FirstOrDefault
(p => string.Equals(p.PropertyName, propertyPathTree[i]
, StringComparison.OrdinalIgnoreCase));
if (attemptedProperty != null)
{
// unless we're at the last item, we should continue searching.
// If we're at the last item, we need to stop
if (!(i == propertyPathTree.Count - 1))
{
targetObject = attemptedProperty.ValueProvider.GetValue(targetObject);
if (targetObject == null)
{
throw new Exception($"Attempted to walk path '/{string.Join("/", propertyPathTree.GetRange(0, i + 1))}' on given '{objectToSearch.GetType().Name}' but encountered null");
}
}
}
else
{
// property cannot be found
// Stop, and return invalid path.
break;
}
}
}
var leftOverPath = propertyPathTree
.GetRange(lastPosition, propertyPathTree.Count - lastPosition);
if (leftOverPath.Count == 1)
{
var jsonContract = (JsonObjectContract)contractResolver
.ResolveContract(targetObject.GetType());
var attemptedProperty = jsonContract.Properties.FirstOrDefault
(p => string.Equals(p.PropertyName, leftOverPath.Last()
, StringComparison.OrdinalIgnoreCase));
if (attemptedProperty == null)
{
if (leftOverPath.Last().StartsWith("[") && leftOverPath.Last().EndsWith("]"))
{
attemptedProperty = jsonContract.Properties.FirstOrDefault(p => string.Equals(p.PropertyName, propertyPathTree[lastPosition - 1], StringComparison.OrdinalIgnoreCase));
if (attemptedProperty != null)
{
IsValidPathForAdd = false;
IsValidPathForRemove = true;
JsonPatchProperty = new Helpers.JsonPatchProperty(attemptedProperty, targetObject);
PropertyPathInParent = leftOverPath.Last();
}
else
{
IsValidPathForAdd = false;
IsValidPathForRemove = false;
}
}
else
{
IsValidPathForAdd = false;
IsValidPathForRemove = false;
}
}
else
{
IsValidPathForAdd = true;
IsValidPathForRemove = true;
JsonPatchProperty = new Helpers.JsonPatchProperty(attemptedProperty, targetObject);
PropertyPathInParent = leftOverPath.Last();
}
}
else
{
IsValidPathForAdd = false;
IsValidPathForRemove = false;
}
}