/// <summary>
/// Loads mapping configurations from an XML reader.
/// </summary>
public void Load(XmlReader mappingXml)
{
while (mappingXml.Read())
{
// Check for allowed XML nodex
if (!(mappingXml.NodeType == XmlNodeType.Element))
{
if (mappingXml.NodeType == XmlNodeType.Text)
{
throw new MappingConfigurationException(String.Format("Node type {0} is not allowed here.", mappingXml.NodeType), "Object", mappingXml);
}
else
{
continue;
}
}
else if (mappingXml.Name == "MappingConfiguration" || mappingXml.Name == "Mappings")
{
// Read into content
continue;
}
if (mappingXml.Name == "Object")
{
var objectMapping = new MappingContainer()
{
Root = this
};
string typeName = mappingXml.GetAttribute("Type");
if (typeName == null)
{
throw new MappingConfigurationException("'Type' attribute is missing.", "Object", mappingXml);
}
objectMapping.TargetType = this.ResolveType(typeName);
if (objectMapping.TargetType == null)
{
throw new MappingConfigurationException(String.Format("Type '{0}' could not be found. Did you forget a <Using>? <Using> elements must be defined before any <Object> elements that use it.", typeName), "Object", mappingXml);
}
if (!mappingXml.IsEmptyElement)
{
DeserializeMappings(this, objectMapping, mappingXml);
}
this.Objects.Add(objectMapping.TargetType, objectMapping);
}
else if (mappingXml.Name == "Using")
{
this.Usings.Add(mappingXml.GetAttribute("Namespace"));
}
else
{
throw new MappingConfigurationException(String.Format("<{0}> is not allowed here.", mappingXml.Name), mappingXml);
}
}
}
/// <summary>
/// Parses parentXml and finds MapCommand and ReadCommand objects that should be added to the parent container.
/// </summary>
private static void DeserializeMappings(MappingConfiguration config, MappingContainer parent, XmlReader parentXml)
{
int currentDepth = parentXml.Depth;
string currentName = parentXml.Name;
while (parentXml.Read())
{
// This is the exit condition
if (parentXml.NodeType == XmlNodeType.EndElement && parentXml.Name == currentName && parentXml.Depth == currentDepth)
{
break;
}
else if (parentXml.NodeType == XmlNodeType.Text)
{
throw new MappingConfigurationException(String.Format("<{0}> is not allowed here.", parentXml.Name), parentXml);
}
else if (parentXml.NodeType == XmlNodeType.Element)
{
// Just an alias to make a distinction
XmlReader element = parentXml;
// If a field is specified, create a read command (implicit or explicit)
ReadCommand read = null;
string field = element.GetAttribute("Field");
// Check if mapping command is required
bool required = true;
string srequired = element.GetAttribute("Required");
if (srequired != null && !bool.TryParse(srequired, out required))
{
throw new MappingConfigurationException("Invalid value for Required.", element.Name, element);
}
if (field != null)
{
read = new ReadCommand()
{
Field = field,
VarName = element.GetAttribute("Var") ?? field,
RegexPattern = element.GetAttribute("Regex"),
IsRequired = required
};
}
if (element.Name == "Read")
{
// Field is required for an explicit read command
if (read == null)
{
throw new MappingConfigurationException("Missing 'Field' attribute.", "Read", element);
}
// Register it as a read command
parent.ReadCommands.Add(read);
// Add the command to the parent's inherited list, so that child map commands inherit it also
parent.InheritedReads[read.VarName] = read;
}
else if (element.Name == "Map")
{
// Handle mappings
string to = element.GetAttribute("To");
if (to == null)
{
throw new MappingConfigurationException("Missing 'To' attribute.", "Map", element);
}
string itemType = element.GetAttribute("ItemType");
if (read != null)
{
read.IsImplicit = true;
}
MapCommand map = MapCommand.CreateChild(parent, to, element, read, returnInnermost: true, itemType: itemType);
// Force parent to re-inherit, and then inherit from it
map.Inherit();
map.IsRequired = required;
// Condition
string condition = element.GetAttribute("Condition");
if (condition != null)
{
map.Condition = new EvalComponent(map, condition, element);
}
// Handle value expressions
string valueFormat = element.GetAttribute("Value");
try
{
if (valueFormat != null)
{
map.Value = new ValueFormat(map, valueFormat, element);
}
else
{
if (read != null)
{
map.Value = new ValueFormat(map, "{" + read.VarName + "}", element);
}
}
}
catch (MappingConfigurationException ex)
{
throw new MappingConfigurationException(ex.Message, "Map", element, ex);
}
// Recursively add child nodes
if (!element.IsEmptyElement)
{
DeserializeMappings(config, map, element);
}
}
else
{
throw new MappingConfigurationException(String.Format("Element '{0}' is not allowed here.", parentXml.Name), parentXml);
}
}
}
}
/// <summary>
/// Creates a new map command for a target type, parsing the supplied expression.
/// </summary>
/// <param name="returnInnermost">If true, returns the last nested map created if the expression has multiple parts. If false, returns the top level map.</param>
internal static MapCommand CreateChild(MappingContainer container, string targetExpression, XmlReader xml, ReadCommand implicitRead, bool returnInnermost = false, string itemType = null)
{
if (container == null)
{
throw new ArgumentNullException("container");
}
var map = new MapCommand()
{
Parent = container,
TargetType = container is MapCommand ? ((MapCommand)container).ValueType : container.TargetType,
Root = container.Root
};
// Add to the parent
container.MapCommands.Add(map);
// Keep track of the first one created
var outermost = map;
// No target expression - this is okay, so just return it
if (String.IsNullOrEmpty(targetExpression))
{
return(map);
}
// Parse the expression
MatchCollection matches = _levelRegex.Matches(targetExpression);
for (int i = 0; i < matches.Count; i++)
{
Match match = matches[i];
// ...................................
// READ COMMANDS
if (implicitRead != null)
{
map.ReadCommands.Add(implicitRead);
}
map.Inherit();
// ...................................
// MEMBER
Group memberGroup = match.Groups["member"];
if (!memberGroup.Success)
{
throw new MappingConfigurationException(String.Format("'{0}' is not a valid target for a map command.", targetExpression), "Map", xml);
}
// Do some error checking on target member name type
string targetMemberName = memberGroup.Value;
MemberInfo[] possibleMembers = map.TargetType.GetMember(targetMemberName, BindingFlags.Instance | BindingFlags.Public);
if (possibleMembers == null || possibleMembers.Length < 1)
{
throw new MappingConfigurationException(String.Format("The member '{0}' could not be found on {1}. Make sure it is public and non-static.", targetMemberName, map.TargetType), "Map", xml);
}
if (possibleMembers.Length > 1)
{
throw new MappingConfigurationException(String.Format("'{0}' matched more than one member in type {1}. Make sure it is a property or field.", targetMemberName, map.TargetType));
}
MemberInfo member = possibleMembers[0];
if (member.MemberType != MemberTypes.Field && member.MemberType != MemberTypes.Property)
{
throw new MappingConfigurationException(String.Format("'{0}' is not a property or field and cannot be mapped.", targetMemberName), "Map", xml);
}
if (member.MemberType == MemberTypes.Property && !((PropertyInfo)member).CanWrite)
{
throw new MappingConfigurationException(String.Format("'{0}' is a read-only property and cannot be mapped.", targetMemberName), "Map", xml);
}
map.TargetMember = member;
// ...................................
// INDEXER
// TODO: support more than one indexer (obj[9,2]) + support sequence of indexers (obj[9][2])
Group indexerGroup = match.Groups["indexer"];
if (indexerGroup.Success)
{
string indexer = indexerGroup.Value.Trim();
Type memberType = null;
// Determine indexer type
if (member.MemberType == MemberTypes.Property)
{
memberType = ((PropertyInfo)member).PropertyType;
}
else
{
memberType = ((FieldInfo)member).FieldType;
}
PropertyInfo itemProp = memberType.GetProperty("Item");
ParameterInfo[] indexers = null;
if (itemProp != null)
{
indexers = itemProp.GetIndexParameters();
}
if (indexers == null || indexers.Length == 0)
{
throw new MappingConfigurationException(String.Format("'{0}' does not support indexers.", targetMemberName), "Map", xml);
}
if (indexers.Length > 1)
{
throw new MappingConfigurationException(String.Format("'{0}' has an index with more than one parameter - not currently supported.", targetMemberName), "Map", xml);
}
map.IndexerType = indexers[0].ParameterType;
map.ValueType = itemType == null ? itemProp.PropertyType : Type.GetType(itemType);
if (indexer.StartsWith("{") && indexer.EndsWith("}"))
{
// This is an eval indexer
map.Indexer = new EvalComponent(map, indexer.Substring(1, indexer.Length - 2), xml, inheritedReadOnly: true);
}
else if (indexer.Length > 0)
{
// No eval required, convert the key from string
TypeConverter converter = TypeDescriptor.GetConverter(map.IndexerType);
if (converter == null || !converter.IsValid(indexer))
{
throw new MappingConfigurationException(String.Format("'{0}' cannot be converted to {1} for the {2} indexer.", indexer, map.IndexerType, targetMemberName), "Map", xml);
}
map.Indexer = converter.ConvertFromString(indexer);
}
else
{
// Empty indexers (i.e. 'Add' method) only valid with IList
if (!typeof(IList).IsAssignableFrom(memberType))
{
throw new MappingConfigurationException(String.Format("Invalid indexer defined for target '{0}'.", targetMemberName), "Map", xml);
}
map.Indexer = MapCommand.ListAddingMode;
}
}
// ...................................
// VALUE TYPE
Group valueTypeGroup = match.Groups["valueType"];
if (valueTypeGroup.Success)
{
string valueTypeName = valueTypeGroup.Value;
map.ValueType = map.Root.ResolveType(valueTypeName);
if (map.ValueType == null)
{
throw new MappingConfigurationException(String.Format("The type '{0}' cannot be found - are you missing a '<Using>'?", valueTypeName), "Map", xml);
}
}
else
{
// Use the target member's value type only if no value type was found before (in the case of an indexer, for example)
if (map.ValueType == null)
{
map.ValueType = member.MemberType == MemberTypes.Property ?
((PropertyInfo)member).PropertyType :
((FieldInfo)member).FieldType;
}
}
// ...................................
// DRILL DOWN
if (i < matches.Count - 1)
{
// Since there are more expression matches, create a child map and continue the loop
var child = new MapCommand()
{
TargetType = map.ValueType,
Parent = map,
Root = map.Root,
IsImplicit = true
};
map.MapCommands.Add(child);
map = child;
}
}
// ...................................
return(returnInnermost ? map : outermost);
}
