/// <summary>
/// Examine the children of the specified element and process them as an aggregate. An aggregate is essentially a "reduce" operation
/// that combines a series of inputs into a single value.
/// </summary>
/// <param name="aggFuncType"></param>
/// <param name="aggFunc"></param>
/// <param name="fieldOrProperty"></param>
/// <param name="element"></param>
/// <param name="ti"></param>
/// <param name="o"></param>
void _RecurseAggregate(Type aggFuncType, string aggFunc, IFieldOrProperty fieldOrProperty, XmlNode element, TypeInfo ti, ref object o)
{
// create list for storage of aggregate data
List<object> data = new List<object>();
foreach (XmlNode child in element.ChildNodes)
{
if (child.NodeType != XmlNodeType.Element)
continue;
// check for obj type ref
IXmlPostProcessAction action = null;
action = _LookupObjectTypeRef(child);
if (action != null)
{
data.Add(action);
continue;
}
// check for name ref
action = _LookupNameRef(child);
if (action != null)
{
data.Add(action);
continue;
}
// recurse on type
TypeInfo subType = null;
object subObj = null;
// create new object
_MakeNewObject(ti.Type.FullName, out subObj, out subType);
if (subObj == null)
{
_Warn("Ignoring aggregate subelement: " + child.LocalName);
continue;
}
// if the subType is a primitive or enum, do not recurse on it - instead just set the value directly
if (TypeUtil.IsPrimitiveType(subType.Type))
{
try
{
subObj = TypeUtil.GetPrimitiveValue(subType.Type, child.InnerText);
}
catch (Exception)
{
_Error("TorqueXmlDeserializer._SetFieldOrProperty - Unable to parse format string {0} for type {1}.", child.InnerText, subType.Type.FullName);
}
}
else
{
_Recurse(child, ref subObj, subType);
}
data.Add(subObj);
}
// if we have data, create a post process task to handle the aggregation and set the final value
if (data.Count > 0)
{
IXmlPostProcessAction action = new ProcessAggregateAction(aggFuncType, aggFunc, data, fieldOrProperty, ref o);
_postProcessActions.Add(action);
}
}
/// <summary>
/// Set the value of the input field or property using the element. This function will examine the inputs to determine the
/// best match for the element. In some cases this may trigger a recursive examination of the element's children.
/// </summary>
/// <param name="fieldOrProperty">Field or property whose value will be set.</param>
/// <param name="element">Element to obtain the value from.</param>
/// <param name="o">Object instance whose field or property will be set.</param>
void _SetFieldOrProperty(IFieldOrProperty fieldOrProperty, XmlNode element, ref object o)
{
// first check for valueOf
object value = _CheckValueOf(element);
if (value != null)
{
fieldOrProperty.SetValue(o, value);
// done
return;
}
// check for aggregate
if (_CheckAggregate(fieldOrProperty, element, ref o))
// no need to set value; values of aggregates are set as post process action.
return;
string objName = _GetObjectName(o);
// if its a string we can just set it
if (fieldOrProperty.DeclaredType == typeof(System.String))
{
fieldOrProperty.SetValue(o, element.InnerText);
}
else if (TypeUtil.IsPrimitiveType(fieldOrProperty.DeclaredType))
{
if (element.InnerText == null || element.InnerText.Trim() == string.Empty)
{
_Error("Empty primitive value for type, won't set it: element: " + element.LocalName + ", type: " + fieldOrProperty.DeclaredType.FullName + ", object: " + objName);
}
else
{
// extract primitive value and set it
try
{
fieldOrProperty.SetValue(o, TypeUtil.GetPrimitiveValue(fieldOrProperty.DeclaredType, element.InnerText));
}
catch (Exception)
{
_Error("TorqueXmlDeserializer._SetFieldOrProperty - Unable to parse format string {0} for type {1} for element {2} in object {3}.", element.InnerText, fieldOrProperty.DeclaredType.FullName, element.LocalName, objName);
}
}
}
// if it is a reference type, we can deserialize in to it
else if (fieldOrProperty.DeclaredType.IsClass || fieldOrProperty.DeclaredType.IsInterface || fieldOrProperty.DeclaredType.IsAbstract)
{
bool isInstantiable = !(fieldOrProperty.DeclaredType.IsInterface || fieldOrProperty.DeclaredType.IsAbstract);
object subObj;
TypeInfo subType;
// check for name ref
if (_BindNameRef(element, fieldOrProperty, ref o) != null)
// done with this field
return;
// for reference types, allow deserializing into the existing object, if the attribute is present
// and there is a valid object.
subObj = fieldOrProperty.GetValue(o);
bool inPlace = false;
if (subObj != null)
{
// instance exists, check for attribute - use the property/field type for this, not
// declared type.
object[] attributes = fieldOrProperty.GetCustomAttributes(true);
foreach (object attr in attributes)
if (attr is TorqueXmlDeserializeInPlace)
{
inPlace = true;
break;
}
if (!inPlace)
{
// check for xml attribute
XmlNode inPlaceAttribute = element.Attributes.GetNamedItem("inPlace");
if (inPlaceAttribute != null && Boolean.Parse(inPlaceAttribute.Value))
inPlace = true;
}
}
if (subObj != null && inPlace)
{
// ok to deserialize in place; get the typeinfo object for later use.
subType = TypeUtil.FindTypeInfo(subObj.GetType().FullName);
}
else
{
// log if we are replacing, but there was an instance already
//if (subObj != null)
// _Info("Field has object instance but TorqueXmlDeserializeInPlace/inPlace attribute not specified: creating new object:" + element.LocalName);
// in case we are making a fixed size list, pass the number of children down to the object maker
int childCount = element.ChildNodes.Count;
// if type is not instantiable, we might be able to come up with an instantiable type by looking for type mappings
if (!isInstantiable)
_MakeNewObject(element, out subObj, out subType, childCount);
else
// instantiable type, so make object used declared type
_MakeNewObject(fieldOrProperty.DeclaredType.FullName, out subObj, out subType, childCount);
if (subObj == null)
{
_Error("Unable to create new instance for element {0} on object {1}", element.LocalName, objName);
return;
}
}
// if it is a list of objects, handle it specially
if (subType.IsList)
{
DeserializedList dlist = new DeserializedList(subObj);
_RecurseList(element, ref dlist, subType);
}
else
_Recurse(element, ref subObj, subType);
// set value
// it is important to do this after the element has been deserialized - some property accessors
// assume this (such as lists of link points and object types).
fieldOrProperty.SetValue(o, subObj);
}
// if it is a value type, then it must be a struct (because we handled primitives earlier)
else if (fieldOrProperty.DeclaredType.IsValueType)
{
// look for object type ref
if (_BindObjectTypeRef(element, fieldOrProperty, ref o) != null)
return;
object subObj;
TypeInfo subType;
_MakeNewObject(fieldOrProperty.DeclaredType.FullName, out subObj, out subType);
if (subType == null) // check type for null instead of object, since this is a value type
{
_Error("Unable to create new instance for element {0} on object {1}", element.LocalName, objName);
return;
}
_Recurse(element, ref subObj, subType);
// set value
fieldOrProperty.SetValue(o, subObj);
}
else
_Error("Don't know how to set field or property of type {0} for element {1} on object: {2}", fieldOrProperty.DeclaredType.FullName, element.LocalName, objName);
}
/// <summary>
/// Process the specified name or object type ref.
/// </summary>
/// <param name="nameRefAttribute">the attribute to look for</param>
/// <param name="lookupOnly">whether this is just a lookup (not a bind). if true, fieldOrProperty and object can be null.</param>
/// <param name="isObjectTypeRef">true if this is an object type ref lookup, false if it is a nameref lookup</param>
/// <param name="element">the element to examine</param>
/// <param name="fieldOrProperty">the field or property to set the value on</param>
/// <param name="o">the object instance to set the value on</param>
/// <returns>A post process action, or null if none is appropriate.</returns>
IXmlPostProcessAction _CheckNameRef(string nameRefAttribute, bool lookupOnly, bool isObjectTypeRef, XmlNode element, IFieldOrProperty fieldOrProperty, ref object o)
{
Assert.Fatal(lookupOnly || (fieldOrProperty != null && o != null), "field and instance required for name bind operations");
// see if the element has a nameRef
IXmlPostProcessAction action = null;
XmlNode nameRefAttr = element.Attributes[nameRefAttribute];
if (nameRefAttr != null)
{
if (lookupOnly)
action = new LookupNameRefAction(isObjectTypeRef, nameRefAttr.Value, this);
else
action = new BindNameRefAction(isObjectTypeRef, nameRefAttr.Value, fieldOrProperty, ref o, this);
_postProcessActions.Add(action);
return action;
}
return action;
}
/// <summary>
/// Check to see if the element has an aggregate attribute and process it appropriately if so.
/// </summary>
/// <param name="fieldOrProperty">The IFieldOrProperty instance where the aggregate value will be set.</param>
/// <param name="element">The element to check.</param>
/// <param name="o">The object instance to set the field or property value on.</param>
/// <returns>true if there is an aggregate, false otherwise</returns>
bool _CheckAggregate(IFieldOrProperty fieldOrProperty, XmlNode element, ref object o)
{
// if the element has no child nodes, it cannot be an aggregate
if (element.ChildNodes.Count == 0)
return false;
TypeInfo ti = TypeUtil.FindTypeInfo(fieldOrProperty.DeclaredType.FullName);
if (ti == null)
return false;
bool isAggregate = false;
string aggregateFunction = string.Empty;
if (ti.Type == typeof(TorqueObjectType))
{
isAggregate = true;
aggregateFunction = "Aggregate";
}
// allow override with aggregate attribute
XmlNode aggAttr = element.Attributes.GetNamedItem("aggregateWith");
if (aggAttr != null && aggAttr.Value != null && aggAttr.Value.Trim() != string.Empty)
{
isAggregate = true;
aggregateFunction = aggAttr.Value.Trim();
}
if (!isAggregate)
return false;
Type aggFuncType = null;
string baseType = string.Empty;
string target = string.Empty;
if (aggregateFunction.IndexOf(".") != -1)
{
// its possible to aggregate data using an arbitrary function type. lookup that type
if (!TypeUtil.ParseType(aggregateFunction, out baseType, out target))
{
_Error("Unable to parse aggregate function: " + aggregateFunction);
return false;
}
if (baseType != string.Empty)
{
TypeInfo ati = TypeUtil.FindTypeInfo(baseType);
if (ati == null)
{
_Error("Unable to find aggregate type: " + baseType);
return false;
}
aggFuncType = ati.Type;
}
}
else
{
// no "." in name, so use unqualifed function name on the declared type
target = aggregateFunction;
}
_RecurseAggregate(aggFuncType, target, fieldOrProperty, element, ti, ref o);
return true;
}
/// <summary>
/// Create an object type ref bind action for the specified element, if applicable.
/// </summary>
/// <param name="element"></param>
/// <returns>The object type bind action, or null if no action is required.</returns>
IXmlPostProcessAction _BindObjectTypeRef(XmlNode element, IFieldOrProperty fieldOrProperty, ref object o)
{
IXmlPostProcessAction action = _CheckNameRef("objTypeRef", false, true, element, fieldOrProperty, ref o);
// cannot bind these on value types, because we cannot store a ref reference.
Assert.Fatal(action == null || !(o is ValueType), "Cannot bind object type refs on valuetypes");
return action;
}
/// <summary>
/// Sets the various properties associated with this action.
/// </summary>
/// <param name="aggFuncType">The type of aggregate this is.</param>
/// <param name="aggFunc">The function to use to aggregate the data.</param>
/// <param name="data">The list of objects to aggregate.</param>
/// <param name="fieldOrProperty">The field or property to set.</param>
/// <param name="targetInstance">The object whose field or property is to be set.</param>
public ProcessAggregateAction(Type aggFuncType, string aggFunc, List<object> data, IFieldOrProperty fieldOrProperty, ref object targetInstance)
{
Assert.Fatal(data != null && data.Count > 0, "ProcessAggregateAction Constructor - Invalid data!");
Assert.Fatal(fieldOrProperty != null, "ProcessAggregateAction Constructor - Invalid field or property!");
Assert.Fatal(targetInstance != null, "ProcessAggregateAction Constructor - Invalid target!");
_aggFuncType = aggFuncType;
_aggFunc = aggFunc;
_data = data;
_fieldOrProperty = fieldOrProperty;
_targetInstance = targetInstance;
}
/// <summary>
/// Sets the various properties associated with this action.
/// </summary>
/// <param name="isObjTypeRef">True if the name is an object type, false if it is a named object.</param>
/// <param name="nameRef">The name.</param>
/// <param name="fieldOrProperty">The field or property instance to set.</param>
/// <param name="targetInstance">The object whose property is being set.</param>
/// <param name="d">The deserializer.</param>
public BindNameRefAction(bool isObjTypeRef, string nameRef, IFieldOrProperty fieldOrProperty, ref object targetInstance, TorqueXmlDeserializer d)
: base(d)
{
Assert.Fatal(nameRef != null && nameRef != string.Empty, "BindNameRefAction Constructor - Invalid name specified!");
Assert.Fatal(fieldOrProperty != null, "BindNameRefAction Constructor - Invalid field or property specified!");
Assert.Fatal(targetInstance != null, "BindNameRefAction Constructor - Invalid target instance specified!");
_lookup = new LookupNameRefAction(isObjTypeRef, nameRef, d);
_fieldOrProperty = fieldOrProperty;
_targetInstance = targetInstance;
}
