static public Type GetReferenceType(IEntity entity, PropertyInfo property)
{
Type type = null;
using (LogGroup logGroup = LogGroup.StartDebug("Retrieving the referenced entity type."))
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
if (property == null)
{
throw new ArgumentNullException("property");
}
LogWriter.Debug("Entity type: " + entity.GetType().ToString());
LogWriter.Debug("Property name: " + property.Name);
LogWriter.Debug("Property type: " + property.PropertyType.ToString());
ReferenceAttribute attribute = GetReferenceAttribute(property);
type = GetReferenceType(attribute, entity, property);
if (type != null)
{
LogWriter.Debug("Type: " + type.ToString());
}
}
return(type);
}
static public ReferenceAttribute GetReferenceAttribute(PropertyInfo property)
{
if (property == null)
{
throw new ArgumentNullException("property");
}
ReferenceAttribute attribute = null;
// Logging disabled simply to reduce the size of the logs
//using (LogGroup logGroup = LogGroup.Start("Retrieving the reference attribute for the specified property.", NLog.LogLevel.Debug))
//{
// LogWriter.Debug("Entity: " + sourceType.ToString());
// LogWriter.Debug("Property name: " + property.Name);
// LogWriter.Debug("Property type: " + property.PropertyType.ToString());
foreach (Attribute a in property.GetCustomAttributes(true))
{
if (a is ReferenceAttribute)
{
attribute = (ReferenceAttribute)a;
}
}
// LogWriter.Debug("Attribute found: " + (attribute != null).ToString());
//}
return(attribute);
}
static public string GetMirrorPropertyNameReverse(IEntity sourceEntity, string propertyName, Type referencedEntityType)
{
string mirrorPropertyName = String.Empty;
using (LogGroup logGroup = LogGroup.StartDebug("Retrieving mirror property name using reverse method."))
{
foreach (PropertyInfo property in referencedEntityType.GetProperties())
{
using (LogGroup logGroup2 = LogGroup.StartDebug("Checking property: " + property.Name))
{
if (IsReference(sourceEntity.GetType(), property))
{
LogWriter.Debug("Is reference == true");
Type reverseReferenceType = GetReferenceType(sourceEntity, property);
LogWriter.Debug("reverseReferenceType: " + reverseReferenceType.ToString());
ReferenceAttribute attribute = GetReferenceAttribute(property);
LogWriter.Debug("Mirror property name on attribute: " + attribute.MirrorPropertyName);
LogWriter.Debug("Allow auto discovery (as specified by attribute): " + attribute.AutoDiscoverMirror);
bool attributeMirrorPropertyMatches = attribute.MirrorPropertyName == propertyName;
bool canAutoDiscover = attribute.AutoDiscoverMirror;
bool typeMatches = sourceEntity.GetType().FullName.ToString() == reverseReferenceType.FullName.ToString();
LogWriter.Debug("Attribute mirror property matches: " + attributeMirrorPropertyMatches.ToString());
LogWriter.Debug("Can auto discover: " + canAutoDiscover);
LogWriter.Debug("Type matches: " + typeMatches.ToString());
LogWriter.Debug("Equation: " + typeMatches.ToString() + " && (" + canAutoDiscover + " || " + attributeMirrorPropertyMatches + ")");
if (typeMatches &&
(canAutoDiscover ||
attributeMirrorPropertyMatches))
{
LogWriter.Debug("Mirror property name decided: " + property.Name);
mirrorPropertyName = property.Name;
}
}
}
}
LogWriter.Debug("Mirror property name: " + mirrorPropertyName);
}
return(mirrorPropertyName);
}
static public ReferenceAttribute GetReferenceAttribute(IEntity entity, string propertyName)
{
ReferenceAttribute attribute = null;
PropertyInfo property = entity.GetType().GetProperty(propertyName);
if (property == null)
{
throw new ArgumentException("Can't find '" + propertyName + "' property on '" + entity.GetType().FullName + "' entity type.");
}
attribute = GetReferenceAttribute(property);
return(attribute);
}
static public ReferenceAttribute GetReferenceAttribute(IEntity entity, string propertyName, Type returnType)
{
ReferenceAttribute attribute = null;
// Logging disabled simply to reduce the size of the logs
//using (LogGroup logGroup = LogGroup.Start("...", NLog.LogLevel.Debug))
//{
PropertyInfo property = entity.GetType().GetProperty(propertyName, returnType);
// LogWriter.Debug("Entity: " + entity.GetType().ToString());
// LogWriter.Debug("Property name: " + propertyName);
attribute = GetReferenceAttribute(property);
// LogWriter.Debug("Is reference? " + isReference.ToString());
//}
return(attribute);
}
public static Type GetReferenceType(ReferenceAttribute attribute, IEntity sourceEntity, PropertyInfo property)
{
Type type = null;
Type sourceType = sourceEntity.GetType();
if (attribute == null)
throw new Exception("The reference attribute was not found on the '" + property.Name + "' property of the type '" + sourceType.ToString() + "'.");
if (IsReference(sourceType, property))
{
if (attribute.TypeName != null && attribute.TypeName != String.Empty)
{
LogWriter.Debug("attribute.TypeName != String.Empty");
LogWriter.Debug("attribute.TypeName == " + attribute.TypeName);
type = EntityState.GetType(attribute.TypeName);
}
else if (attribute.TypePropertyName != String.Empty)
{
PropertyInfo typeProperty = sourceType.GetProperty(attribute.TypePropertyName);
// TODO: Use a custom exception instead of a general one
if (typeProperty == null)
throw new Exception("'" + attribute.TypePropertyName + "' property not found on '" + sourceType.Name + "' type as specified by reference attribute on '" + property.Name + "' property.");
string typeName = (string)typeProperty.GetValue(sourceEntity, null);
// If a type name is specified then get the type otherwise leave it null
if (typeName != null && typeName != String.Empty)
{
type = EntityState.GetType(typeName);
}
}
else
{
LogWriter.Debug("attribute.TypeName == String.Empty");
// If the property is a single entity instance
if (IsSingleReference(sourceType, property))
{
LogWriter.Debug("Is a single entity");
type = property.PropertyType;
} // Otherwise the property is a collection/array
else
{
LogWriter.Debug("Is a collection/array");
// If it's an array this should work
type = property.PropertyType.GetElementType();
// If it's not an array (ie. it's a collection) then this should work
if (type == null)
type = property.PropertyType.GetGenericArguments()[0];
}
}
}
return type;
}
static public string GetMirrorPropertyName(IEntity sourceEntity, PropertyInfo property)
{
string mirrorPropertyName = String.Empty;
using (LogGroup logGroup = LogGroup.StartDebug("Retrieving the name of the mirror property that corresponds with the specified property."))
{
if (sourceEntity == null)
{
throw new ArgumentNullException("sourceEntity");
}
if (property == null)
{
throw new ArgumentNullException("property");
}
Type sourceType = sourceEntity.GetType();
ReferenceAttribute attribute = GetReferenceAttribute(property);
if (attribute == null)
{
throw new Exception("No ReferenceAttribute found on the '" + property.Name + "' property of the type '" + sourceType.ToString() + "'.");
}
Type referencedEntityType = GetReferenceType(sourceEntity, property);
// Is the mirror property name specified on the attribute?
if (attribute.MirrorPropertyName != String.Empty ||
attribute.MirrorPropertyName != null)
{
mirrorPropertyName = attribute.MirrorPropertyName;
}
else
{
// Should the mirror property name be automatically discovered based on the property type matching the source entity?
if (attribute.AutoDiscoverMirror)
{
// Loop through each property and check the types
foreach (PropertyInfo p in referencedEntityType.GetProperties())
{
// Is the property a reference?
if (IsReference(referencedEntityType, p))
{
IEntity[] referencedEntities = GetReferencedEntities(sourceEntity, property);
// Retrieve the entity type being stored on the property
Type reciprocalType = GetReferenceType(referencedEntities[0], p);
// If the entity types match then return the property name
if (reciprocalType.FullName == sourceType.FullName)
{
mirrorPropertyName = p.Name;
}
}
}
}
}
LogWriter.Debug("Mirror property name: " + mirrorPropertyName);
}
return(mirrorPropertyName);
}
static public bool IsReference(Type sourceType, PropertyInfo property)
{
bool isReference = false;
bool validType = false;
if (property == null)
{
throw new ArgumentNullException("property");
}
if (sourceType == null)
{
throw new ArgumentNullException("sourceType");
}
//using (LogGroup logGroup = LogGroup.Start("Checking if the specified property is an entity reference.", NLog.LogLevel.Debug))
//{
// LogWriter.Debug("Entity: " + sourceType.ToString());
// LogWriter.Debug("Property name: " + property.Name);
ReferenceAttribute reference = GetReferenceAttribute(property);
isReference = reference != null;
if (isReference)
{
Type referenceType = property.PropertyType;
if (typeof(Array).IsAssignableFrom(referenceType))
{
// If it's an array this should work
referenceType = property.PropertyType.GetElementType();
// If it's not an array (ie. it's a collection) then this should work
if (referenceType == null)
{
//LogWriter.Debug("Property is a collection.");
referenceType = property.PropertyType.GetGenericArguments()[0];
}
//else
// LogWriter.Debug("Property is an array.");
}
validType = EntityState.IsType(referenceType);
// If it's not a valid type then try using the type sepcified on the attribute
if (!validType && reference.TypeName != String.Empty)
{
referenceType = EntityState.GetType(reference.TypeName);
validType = EntityState.IsType(referenceType);
}
if (!validType)
{
throw new Exception("Referenced type '" + referenceType.Name + "' on property '" + property.Name + "' of source entity type '" + sourceType.FullName + "' is not registered as a valid entity type. Make sure that the referenced type has an EntityAttribute.");
}
}
// LogWriter.Debug("Is reference? " + isReference.ToString());
// LogWriter.Debug("Valid type? " + validType.ToString());
//}
return(isReference && validType);
}
static public Type GetReferenceType(ReferenceAttribute attribute, IEntity sourceEntity, PropertyInfo property)
{
Type type = null;
Type sourceType = sourceEntity.GetType();
if (attribute == null)
{
throw new Exception("The reference attribute was not found on the '" + property.Name + "' property of the type '" + sourceType.ToString() + "'.");
}
if (IsReference(sourceType, property))
{
if (attribute.TypeName != null && attribute.TypeName != String.Empty)
{
LogWriter.Debug("attribute.TypeName != String.Empty");
LogWriter.Debug("attribute.TypeName == " + attribute.TypeName);
type = EntityState.GetType(attribute.TypeName);
}
else if (attribute.TypePropertyName != String.Empty)
{
PropertyInfo typeProperty = sourceType.GetProperty(attribute.TypePropertyName);
// TODO: Use a custom exception instead of a general one
if (typeProperty == null)
{
throw new Exception("'" + attribute.TypePropertyName + "' property not found on '" + sourceType.Name + "' type as specified by reference attribute on '" + property.Name + "' property.");
}
string typeName = (string)typeProperty.GetValue(sourceEntity, null);
// If a type name is specified then get the type otherwise leave it null
if (typeName != null && typeName != String.Empty)
{
type = EntityState.GetType(typeName);
}
}
else
{
LogWriter.Debug("attribute.TypeName == String.Empty");
// If the property is a single entity instance
if (IsSingleReference(sourceType, property))
{
LogWriter.Debug("Is a single entity");
type = property.PropertyType;
} // Otherwise the property is a collection/array
else
{
LogWriter.Debug("Is a collection/array");
// If it's an array this should work
type = property.PropertyType.GetElementType();
// If it's not an array (ie. it's a collection) then this should work
if (type == null)
{
type = property.PropertyType.GetGenericArguments()[0];
}
}
}
}
return(type);
}
