/// <summary>Writes all used namespaces of the subtree in node to the output.</summary>
/// <remarks>
/// Writes all used namespaces of the subtree in node to the output.
/// The subtree is recursively traversed.
/// </remarks>
/// <param name="node">the root node of the subtree</param>
/// <param name="usedPrefixes">a set containing currently used prefixes</param>
/// <param name="indent">the current indent level</param>
/// <exception cref="System.IO.IOException">Forwards all writer exceptions.</exception>
private void DeclareUsedNamespaces(XmpNode node, ICollection <object> usedPrefixes, int indent)
{
if (node.Options.IsSchemaNode)
{
// The schema node name is the URI, the value is the prefix.
var prefix = node.Value.Substring(0, node.Value.Length - 1 - 0);
DeclareNamespace(prefix, node.Name, usedPrefixes, indent);
}
else if (node.Options.IsStruct)
{
for (var it = node.IterateChildren(); it.HasNext();)
{
var field = (XmpNode)it.Next();
DeclareNamespace(field.Name, null, usedPrefixes, indent);
}
}
for (var it = node.IterateChildren(); it.HasNext();)
{
var child = (XmpNode)it.Next();
DeclareUsedNamespaces(child, usedPrefixes, indent);
}
for (var it = node.IterateQualifier(); it.HasNext();)
{
var qualifier = (XmpNode)it.Next();
DeclareNamespace(qualifier.Name, null, usedPrefixes, indent);
DeclareUsedNamespaces(qualifier, usedPrefixes, indent);
}
}
/// <summary>Make sure that the array is well-formed AltText.</summary>
/// <remarks>
/// Make sure that the array is well-formed AltText. Each item must be simple
/// and have an "xml:lang" qualifier. If repairs are needed, keep simple
/// non-empty items by adding the "xml:lang" with value "x-repair".
/// </remarks>
/// <param name="arrayNode">the property node of the array to repair.</param>
/// <exception cref="XmpException">Forwards unexpected exceptions.</exception>
private static void RepairAltText(XmpNode arrayNode)
{
if (arrayNode == null || !arrayNode.Options.IsArray)
{
// Already OK or not even an array.
return;
}
// fix options
arrayNode.Options.IsArrayOrdered = true;
arrayNode.Options.IsArrayAlternate = true;
arrayNode.Options.IsArrayAltText = true;
for (var it = arrayNode.IterateChildren(); it.HasNext();)
{
var currChild = (XmpNode)it.Next();
if (currChild.Options.IsCompositeProperty)
{
// Delete non-simple children.
it.Remove();
}
else if (!currChild.Options.HasLanguage)
{
if (string.IsNullOrEmpty(currChild.Value))
{
// Delete empty valued children that have no xml:lang.
it.Remove();
}
else
{
// Add an xml:lang qualifier with the value "x-repair".
var repairLang = new XmpNode(XmpConstants.XmlLang, "x-repair", null);
currChild.AddQualifier(repairLang);
}
}
}
}
/// <summary>The outermost call is special.</summary>
/// <remarks>
/// The outermost call is special. The names almost certainly differ. The
/// qualifiers (and hence options) will differ for an alias to the x-default
/// item of a langAlt array.
/// </remarks>
/// <param name="aliasNode">the alias node</param>
/// <param name="baseNode">the base node of the alias</param>
/// <param name="outerCall">marks the outer call of the recursion</param>
/// <exception cref="XmpException">Forwards XMP errors</exception>
private static void CompareAliasedSubtrees(XmpNode aliasNode, XmpNode baseNode, bool outerCall)
{
if (baseNode.Value != aliasNode.Value || aliasNode.GetChildrenLength() != baseNode.GetChildrenLength())
{
throw new XmpException("Mismatch between alias and base nodes", XmpErrorCode.BadXmp);
}
if (!outerCall && (baseNode.Name != aliasNode.Name || !aliasNode.Options.Equals(baseNode.Options) || aliasNode.GetQualifierLength() != baseNode.GetQualifierLength()))
{
throw new XmpException("Mismatch between alias and base nodes", XmpErrorCode.BadXmp);
}
for (IIterator an = aliasNode.IterateChildren(), bn = baseNode.IterateChildren(); an.HasNext() && bn.HasNext();)
{
var aliasChild = (XmpNode)an.Next();
var baseChild = (XmpNode)bn.Next();
CompareAliasedSubtrees(aliasChild, baseChild, false);
}
for (IIterator an = aliasNode.IterateQualifier(), bn1 = baseNode.IterateQualifier(); an.HasNext() && bn1.HasNext();)
{
var aliasQual = (XmpNode)an.Next();
var baseQual = (XmpNode)bn1.Next();
CompareAliasedSubtrees(aliasQual, baseQual, false);
}
}
/// <summary>See if an array is an alt-text array.</summary>
/// <remarks>
/// See if an array is an alt-text array. If so, make sure the x-default item
/// is first.
/// </remarks>
/// <param name="arrayNode">the array node to check if its an alt-text array</param>
internal static void DetectAltText(XmpNode arrayNode)
{
if (!arrayNode.Options.IsArrayAlternate || !arrayNode.HasChildren)
{
return;
}
var isAltText = false;
for (var it = arrayNode.IterateChildren(); it.HasNext();)
{
var child = (XmpNode)it.Next();
if (child.Options.HasLanguage)
{
isAltText = true;
break;
}
}
if (isAltText)
{
arrayNode.Options.IsArrayAltText = true;
NormalizeLangArray(arrayNode);
}
}
/// <summary>Prepares the next node to return if not already done.</summary>
public virtual bool HasNext()
{
if (_returnProperty != null)
{
// hasNext has been called before
return(true);
}
// find next node
switch (_state)
{
case IterateNode:
return(ReportNode());
case IterateChildren:
if (_childrenIterator == null)
{
_childrenIterator = _visitedNode.IterateChildren();
}
var hasNext = IterateChildrenMethod(_childrenIterator);
if (!hasNext && _visitedNode.HasQualifier && !_enclosing.Options.IsOmitQualifiers)
{
_state = IterateQualifier;
_childrenIterator = null;
hasNext = HasNext();
}
return(hasNext);
}
if (_childrenIterator == null)
{
_childrenIterator = _visitedNode.IterateQualifier();
}
return(IterateChildrenMethod(_childrenIterator));
}
/// <summary>
/// Serializes one schema with all contained properties in pretty-printed manner.
/// </summary>
/// <remarks>
/// Each schema's properties are written to a single
/// rdf:Description element. All of the necessary namespaces are declared in
/// the rdf:Description element. The baseIndent is the base level for the
/// entire serialization, that of the x:xmpmeta element. An xml:lang
/// qualifier is written as an attribute of the property start tag, not by
/// itself forcing the qualified property form.
/// <code>
/// <rdf:Description rdf:about="TreeName" xmlns:ns="URI" ... >
/// ... The actual properties of the schema, see SerializePrettyRDFProperty
/// <!-- ns1:Alias is aliased to ns2:Actual --> ... If alias comments are wanted
/// </rdf:Description>
/// </code>
/// </remarks>
/// <param name="schemaNode">a schema node</param>
/// <param name="level"></param>
/// <exception cref="System.IO.IOException">Forwarded writer exceptions</exception>
/// <exception cref="XmpException"></exception>
private void SerializeCanonicalRdfSchema(XmpNode schemaNode, int level)
{
// Write each of the schema's actual properties.
for (var it = schemaNode.IterateChildren(); it.HasNext();)
{
var propNode = (XmpNode)it.Next();
SerializeCanonicalRdfProperty(propNode, _options.UseCanonicalFormat, false, level + 2);
}
}
/// <summary>Constructor</summary>
/// <param name="enclosing"></param>
/// <param name="parentNode">the node which children shall be iterated.</param>
/// <param name="parentPath">the full path of the former node without the leaf node.</param>
public NodeIteratorChildren(XmpIterator enclosing, XmpNode parentNode, string parentPath)
: base(enclosing)
{
_enclosing = enclosing;
if (parentNode.Options.IsSchemaNode)
{
_enclosing.BaseNamespace = parentNode.Name;
}
_parentPath = AccumulatePath(parentNode, parentPath, 1);
_childrenIterator = parentNode.IterateChildren();
}
/// <summary>Remove all schema children according to the flag <c>doAllProperties</c>.</summary>
/// <remarks>Empty schemas are automatically remove by <c>XMPNode</c>.</remarks>
/// <param name="schemaNode">a schema node</param>
/// <param name="doAllProperties">flag if all properties or only externals shall be removed.</param>
/// <returns>Returns true if the schema is empty after the operation.</returns>
private static bool RemoveSchemaChildren(XmpNode schemaNode, bool doAllProperties)
{
for (var it = schemaNode.IterateChildren(); it.HasNext();)
{
var currProp = (XmpNode)it.Next();
if (doAllProperties || !Utils.IsInternalProperty(schemaNode.Name, currProp.Name))
{
it.Remove();
}
}
return(!schemaNode.HasChildren);
}
/// <summary>Remove all empty schemas from the metadata tree that were generated during the rdf parsing.</summary>
/// <param name="tree">the root of the metadata tree</param>
private static void DeleteEmptySchemas(XmpNode tree)
{
// Delete empty schema nodes. Do this last, other cleanup can make empty
// schema.
for (var it = tree.IterateChildren(); it.HasNext();)
{
var schema = (XmpNode)it.Next();
if (!schema.HasChildren)
{
it.Remove();
}
}
}
/// <summary>Write each of the parent's simple unqualified properties as an attribute.</summary>
/// <remarks>
/// Write each of the parent's simple unqualified properties as an attribute. Returns true if all
/// of the properties are written as attributes.
/// </remarks>
/// <param name="parentNode">the parent property node</param>
/// <param name="indent">the current indent level</param>
/// <returns>Returns true if all properties can be rendered as RDF attribute.</returns>
/// <exception cref="System.IO.IOException" />
private bool SerializeCompactRdfAttrProps(XmpNode parentNode, int indent)
{
var allAreAttrs = true;
for (var it = parentNode.IterateChildren(); it.HasNext();)
{
var prop = (XmpNode)it.Next();
if (CanBeRdfAttrProp(prop))
{
WriteNewline();
WriteIndent(indent);
Write(prop.Name);
Write("=\"");
AppendNodeValue(prop.Value, true);
Write('"');
}
else
{
allAreAttrs = false;
}
}
return(allAreAttrs);
}
/// <summary>
/// </summary>
/// <remarks>
/// <list>
/// <item>Look for an exact match with the specific language.</item>
/// <item>If a generic language is given, look for partial matches.</item>
/// <item>Look for an "x-default"-item.</item>
/// <item>Choose the first item.</item>
/// </list>
/// </remarks>
/// <param name="arrayNode">the alt text array node</param>
/// <param name="genericLang">the generic language</param>
/// <param name="specificLang">the specific language</param>
/// <returns>
/// Returns the kind of match as an Integer and the found node in an
/// array.
/// </returns>
/// <exception cref="XmpException"/>
internal static object[] ChooseLocalizedText(XmpNode arrayNode, string genericLang, string specificLang)
{
// See if the array has the right form. Allow empty alt arrays,
// that is what parsing returns.
if (!arrayNode.Options.IsArrayAltText)
{
throw new XmpException("Localized text array is not alt-text", XmpErrorCode.BadXPath);
}
if (!arrayNode.HasChildren)
{
return new object[] { CltNoValues, null }
}
;
var foundGenericMatches = 0;
XmpNode resultNode = null;
XmpNode xDefault = null;
// Look for the first partial match with the generic language.
for (var it = arrayNode.IterateChildren(); it.HasNext();)
{
var currItem = (XmpNode)it.Next();
// perform some checks on the current item
if (currItem.Options.IsCompositeProperty)
{
throw new XmpException("Alt-text array item is not simple", XmpErrorCode.BadXPath);
}
if (!currItem.HasQualifier || currItem.GetQualifier(1).Name != XmpConstants.XmlLang)
{
throw new XmpException("Alt-text array item has no language qualifier", XmpErrorCode.BadXPath);
}
var currLang = currItem.GetQualifier(1).Value;
// Look for an exact match with the specific language.
if (currLang == specificLang)
{
return new object[] { CltSpecificMatch, currItem }
}
;
if (genericLang != null && currLang.StartsWith(genericLang))
{
if (resultNode == null)
{
resultNode = currItem;
}
// ! Don't return/break, need to look for other matches.
foundGenericMatches++;
}
else if (currLang == XmpConstants.XDefault)
{
xDefault = currItem;
}
}
// evaluate loop
if (foundGenericMatches == 1)
{
return new object[] { CltSingleGeneric, resultNode }
}
;
if (foundGenericMatches > 1)
{
return new object[] { CltMultipleGeneric, resultNode }
}
;
if (xDefault != null)
{
return new object[] { CltXDefault, xDefault }
}
;
// Everything failed, choose the first item.
return(new object[] { CltFirstItem, arrayNode.GetChild(1) });
}
/// <summary>Compares two nodes including its children and qualifier.</summary>
/// <param name="leftNode">an <c>XMPNode</c></param>
/// <param name="rightNode">an <c>XMPNode</c></param>
/// <returns>Returns true if the nodes are equal, false otherwise.</returns>
/// <exception cref="XmpException">Forwards exceptions to the calling method.</exception>
private static bool ItemValuesMatch(XmpNode leftNode, XmpNode rightNode)
{
var leftForm = leftNode.Options;
var rightForm = rightNode.Options;
if (leftForm.Equals(rightForm))
{
return(false);
}
if (leftForm.GetOptions() == 0)
{
// Simple nodes, check the values and xml:lang qualifiers.
if (!leftNode.Value.Equals(rightNode.Value))
{
return(false);
}
if (leftNode.Options.HasLanguage != rightNode.Options.HasLanguage)
{
return(false);
}
if (leftNode.Options.HasLanguage && !leftNode.GetQualifier(1).Value.Equals(rightNode.GetQualifier(1).Value))
{
return(false);
}
}
else
{
if (leftForm.IsStruct)
{
// Struct nodes, see if all fields match, ignoring order.
if (leftNode.GetChildrenLength() != rightNode.GetChildrenLength())
{
return(false);
}
for (var it = leftNode.IterateChildren(); it.HasNext();)
{
var leftField = (XmpNode)it.Next();
var rightField = XmpNodeUtils.FindChildNode(rightNode, leftField.Name, false);
if (rightField == null || !ItemValuesMatch(leftField, rightField))
{
return(false);
}
}
}
else
{
// Array nodes, see if the "leftNode" values are present in the
// "rightNode", ignoring order, duplicates,
// and extra values in the rightNode-> The rightNode is the
// destination for AppendProperties.
Debug.Assert(leftForm.IsArray);
for (var il = leftNode.IterateChildren(); il.HasNext();)
{
var leftItem = (XmpNode)il.Next();
var match = false;
for (var ir = rightNode.IterateChildren(); ir.HasNext();)
{
var rightItem = (XmpNode)ir.Next();
if (ItemValuesMatch(leftItem, rightItem))
{
match = true;
break;
}
}
if (!match)
{
return(false);
}
}
}
}
return(true);
}
/// <param name="destXmp">The destination XMP object.</param>
/// <param name="sourceNode">the source node</param>
/// <param name="destParent">the parent of the destination node</param>
/// <param name="replaceOldValues">Replace the values of existing properties.</param>
/// <param name="deleteEmptyValues">flag if properties with empty values should be deleted in the destination object.</param>
/// <exception cref="XmpException"/>
private static void AppendSubtree(XmpMeta destXmp, XmpNode sourceNode, XmpNode destParent, bool replaceOldValues, bool deleteEmptyValues)
{
var destNode = XmpNodeUtils.FindChildNode(destParent, sourceNode.Name, false);
var valueIsEmpty = false;
if (deleteEmptyValues)
{
valueIsEmpty = sourceNode.Options.IsSimple ? string.IsNullOrEmpty(sourceNode.Value) : !sourceNode.HasChildren;
}
if (deleteEmptyValues && valueIsEmpty)
{
if (destNode != null)
{
destParent.RemoveChild(destNode);
}
}
else
{
if (destNode == null)
{
// The one easy case, the destination does not exist.
destParent.AddChild((XmpNode)sourceNode.Clone());
}
else
{
if (replaceOldValues)
{
// The destination exists and should be replaced.
destXmp.SetNode(destNode, sourceNode.Value, sourceNode.Options, true);
destParent.RemoveChild(destNode);
destNode = (XmpNode)sourceNode.Clone();
destParent.AddChild(destNode);
}
else
{
// The destination exists and is not totally replaced. Structs and arrays are merged.
var sourceForm = sourceNode.Options;
var destForm = destNode.Options;
if (sourceForm != destForm)
{
return;
}
if (sourceForm.IsStruct)
{
// To merge a struct process the fields recursively. E.g. add simple missing fields.
// The recursive call to AppendSubtree will handle deletion for fields with empty
// values.
for (var it = sourceNode.IterateChildren(); it.HasNext();)
{
var sourceField = (XmpNode)it.Next();
AppendSubtree(destXmp, sourceField, destNode, replaceOldValues, deleteEmptyValues);
if (deleteEmptyValues && !destNode.HasChildren)
{
destParent.RemoveChild(destNode);
}
}
}
else if (sourceForm.IsArrayAltText)
{
// Merge AltText arrays by the "xml:lang" qualifiers. Make sure x-default is first.
// Make a special check for deletion of empty values. Meaningful in AltText arrays
// because the "xml:lang" qualifier provides unambiguous source/dest correspondence.
for (var it = sourceNode.IterateChildren(); it.HasNext();)
{
var sourceItem = (XmpNode)it.Next();
if (!sourceItem.HasQualifier || !XmpConstants.XmlLang.Equals(sourceItem.GetQualifier(1).Name))
{
continue;
}
var destIndex = XmpNodeUtils.LookupLanguageItem(destNode, sourceItem.GetQualifier(1).Value);
if (deleteEmptyValues && string.IsNullOrEmpty(sourceItem.Value))
{
if (destIndex != -1)
{
destNode.RemoveChild(destIndex);
if (!destNode.HasChildren)
{
destParent.RemoveChild(destNode);
}
}
}
else if (destIndex == -1)
{
// Not replacing, keep the existing item.
if (!XmpConstants.XDefault.Equals(sourceItem.GetQualifier(1).Value) || !destNode.HasChildren)
{
sourceItem.CloneSubtree(destNode);
}
else
{
var destItem = new XmpNode(sourceItem.Name, sourceItem.Value, sourceItem.Options);
sourceItem.CloneSubtree(destItem);
destNode.AddChild(1, destItem);
}
}
}
}
else if (sourceForm.IsArray)
{
// Merge other arrays by item values. Don't worry about order or duplicates. Source
// items with empty values do not cause deletion, that conflicts horribly with
// merging.
for (var children = sourceNode.IterateChildren(); children.HasNext();)
{
var sourceItem = (XmpNode)children.Next();
var match = false;
for (var id = destNode.IterateChildren(); id.HasNext();)
{
var destItem = (XmpNode)id.Next();
if (ItemValuesMatch(sourceItem, destItem))
{
match = true;
}
}
if (!match)
{
destNode = (XmpNode)sourceItem.Clone();
destParent.AddChild(destNode);
}
}
}
}
}
}
}
/// <summary>Recursively handles the "value" for a node.</summary>
/// <remarks>
/// Recursively handles the "value" for a node. It does not matter if it is a
/// top level property, a field of a struct, or an item of an array. The
/// indent is that for the property element. An xml:lang qualifier is written
/// as an attribute of the property start tag, not by itself forcing the
/// qualified property form. The patterns below mostly ignore attribute
/// qualifiers like xml:lang. Except for the one struct case, attribute
/// qualifiers don't affect the output form.
/// <code>
/// <ns:UnqualifiedSimpleProperty>value</ns:UnqualifiedSimpleProperty>
/// <ns:UnqualifiedStructProperty> (If no rdf:resource qualifier)
/// <rdf:Description>
/// ... Fields, same forms as top level properties
/// </rdf:Description>
/// </ns:UnqualifiedStructProperty>
/// <ns:ResourceStructProperty rdf:resource="URI"
/// ... Fields as attributes
/// >
/// <ns:UnqualifiedArrayProperty>
/// <rdf:Bag> or Seq or Alt
/// ... Array items as rdf:li elements, same forms as top level properties
/// </rdf:Bag>
/// </ns:UnqualifiedArrayProperty>
/// <ns:QualifiedProperty>
/// <rdf:Description>
/// <rdf:value> ... Property "value" following the unqualified
/// forms ... </rdf:value>
/// ... Qualifiers looking like named struct fields
/// </rdf:Description>
/// </ns:QualifiedProperty>
/// </code>
/// </remarks>
/// <param name="node">the property node</param>
/// <param name="emitAsRdfValue">property shall be rendered as attribute rather than tag</param>
/// <param name="useCanonicalRdf">
/// use canonical form with inner description tag or
/// the compact form with rdf:ParseType="resource" attribute.
/// </param>
/// <param name="indent">the current indent level</param>
/// <exception cref="System.IO.IOException">Forwards all writer exceptions.</exception>
/// <exception cref="XmpException">If "rdf:resource" and general qualifiers are mixed.</exception>
private void SerializeCanonicalRdfProperty(XmpNode node, bool useCanonicalRdf, bool emitAsRdfValue, int indent)
{
var emitEndTag = true;
var indentEndTag = true;
// Determine the XML element name. Open the start tag with the name and
// attribute qualifiers.
var elemName = node.Name;
if (emitAsRdfValue)
{
elemName = "rdf:value";
}
else if (elemName == XmpConstants.ArrayItemName)
{
elemName = XmpConstants.RdfLi;
}
WriteIndent(indent);
Write('<');
Write(elemName);
var hasGeneralQualifiers = false;
var hasRdfResourceQual = false;
for (var it = node.IterateQualifier(); it.HasNext();)
{
var qualifier = (XmpNode)it.Next();
if (!RdfAttrQualifier.Contains(qualifier.Name))
{
hasGeneralQualifiers = true;
}
else
{
hasRdfResourceQual = qualifier.Name == "rdf:resource";
if (!emitAsRdfValue)
{
Write(' ');
Write(qualifier.Name);
Write("=\"");
AppendNodeValue(qualifier.Value, true);
Write('"');
}
}
}
// Process the property according to the standard patterns.
if (hasGeneralQualifiers && !emitAsRdfValue)
{
// This node has general, non-attribute, qualifiers. Emit using the
// qualified property form.
// ! The value is output by a recursive call ON THE SAME NODE with
// emitAsRDFValue set.
if (hasRdfResourceQual)
{
throw new XmpException("Can't mix rdf:resource and general qualifiers", XmpErrorCode.BadRdf);
}
// Change serialization to canonical format with inner rdf:Description-tag
// depending on option
if (useCanonicalRdf)
{
Write(">");
WriteNewline();
indent++;
WriteIndent(indent);
Write(RdfStructStart);
Write(">");
}
else
{
Write(" rdf:parseType=\"Resource\">");
}
WriteNewline();
SerializeCanonicalRdfProperty(node, useCanonicalRdf, true, indent + 1);
for (var it = node.IterateQualifier(); it.HasNext();)
{
var qualifier = (XmpNode)it.Next();
if (!RdfAttrQualifier.Contains(qualifier.Name))
{
SerializeCanonicalRdfProperty(qualifier, useCanonicalRdf, false, indent + 1);
}
}
if (useCanonicalRdf)
{
WriteIndent(indent);
Write(RdfStructEnd);
WriteNewline();
indent--;
}
}
else
{
// This node has no general qualifiers. Emit using an unqualified form.
if (!node.Options.IsCompositeProperty)
{
// This is a simple property.
if (node.Options.IsUri)
{
Write(" rdf:resource=\"");
AppendNodeValue(node.Value, true);
Write("\"/>");
WriteNewline();
emitEndTag = false;
}
else if (string.IsNullOrEmpty(node.Value))
{
Write("/>");
WriteNewline();
emitEndTag = false;
}
else
{
Write('>');
AppendNodeValue(node.Value, false);
indentEndTag = false;
}
}
else
{
if (node.Options.IsArray)
{
// This is an array.
Write('>');
WriteNewline();
EmitRdfArrayTag(node, true, indent + 1);
if (node.Options.IsArrayAltText)
{
XmpNodeUtils.NormalizeLangArray(node);
}
for (var it1 = node.IterateChildren(); it1.HasNext();)
{
var child = (XmpNode)it1.Next();
SerializeCanonicalRdfProperty(child, useCanonicalRdf, false, indent + 2);
}
EmitRdfArrayTag(node, false, indent + 1);
}
else if (!hasRdfResourceQual)
{
// This is a "normal" struct, use the rdf:parseType="Resource" form.
if (!node.HasChildren)
{
// Change serialization to canonical format with inner rdf:Description-tag
// if option is set
if (useCanonicalRdf)
{
Write(">");
WriteNewline();
WriteIndent(indent + 1);
Write(RdfEmptyStruct);
}
else
{
Write(" rdf:parseType=\"Resource\"/>");
emitEndTag = false;
}
WriteNewline();
}
else
{
// Change serialization to canonical format with inner rdf:Description-tag
// if option is set
if (useCanonicalRdf)
{
Write(">");
WriteNewline();
indent++;
WriteIndent(indent);
Write(RdfStructStart);
Write(">");
}
else
{
Write(" rdf:parseType=\"Resource\">");
}
WriteNewline();
for (var it = node.IterateChildren(); it.HasNext();)
{
var child = (XmpNode)it.Next();
SerializeCanonicalRdfProperty(child, useCanonicalRdf, false, indent + 1);
}
if (useCanonicalRdf)
{
WriteIndent(indent);
Write(RdfStructEnd);
WriteNewline();
indent--;
}
}
}
else
{
// This is a struct with an rdf:resource attribute, use the
// "empty property element" form.
for (var it1 = node.IterateChildren(); it1.HasNext();)
{
var child = (XmpNode)it1.Next();
if (!CanBeRdfAttrProp(child))
{
throw new XmpException("Can't mix rdf:resource and complex fields", XmpErrorCode.BadRdf);
}
WriteNewline();
WriteIndent(indent + 1);
Write(' ');
Write(child.Name);
Write("=\"");
AppendNodeValue(child.Value, true);
Write('"');
}
Write("/>");
WriteNewline();
emitEndTag = false;
}
}
}
// Emit the property element end tag.
if (emitEndTag)
{
if (indentEndTag)
{
WriteIndent(indent);
}
Write("</");
Write(elemName);
Write('>');
WriteNewline();
}
}
/// <summary>Serializes a struct property.</summary>
/// <param name="node">an XMPNode</param>
/// <param name="indent">the current indent level</param>
/// <param name="hasRdfResourceQual">Flag if the element has resource qualifier</param>
/// <returns>Returns true if an end flag shall be emitted.</returns>
/// <exception cref="System.IO.IOException">Forwards the writer exceptions.</exception>
/// <exception cref="XmpException">If qualifier and element fields are mixed.</exception>
private bool SerializeCompactRdfStructProp(XmpNode node, int indent, bool hasRdfResourceQual)
{
// This must be a struct.
var hasAttrFields = false;
var hasElemFields = false;
var emitEndTag = true;
for (var ic = node.IterateChildren(); ic.HasNext();)
{
var field = (XmpNode)ic.Next();
if (CanBeRdfAttrProp(field))
{
hasAttrFields = true;
}
else
{
hasElemFields = true;
}
if (hasAttrFields && hasElemFields)
{
break;
}
}
// No sense looking further.
if (hasRdfResourceQual && hasElemFields)
{
throw new XmpException("Can't mix rdf:resource qualifier and element fields", XmpErrorCode.BadRdf);
}
if (!node.HasChildren)
{
// Catch an empty struct as a special case. The case
// below would emit an empty
// XML element, which gets reparsed as a simple property
// with an empty value.
Write(" rdf:parseType=\"Resource\"/>");
WriteNewline();
emitEndTag = false;
}
else if (!hasElemFields)
{
// All fields can be attributes, use the
// emptyPropertyElt form.
SerializeCompactRdfAttrProps(node, indent + 1);
Write("/>");
WriteNewline();
emitEndTag = false;
}
else if (!hasAttrFields)
{
// All fields must be elements, use the
// parseTypeResourcePropertyElt form.
Write(" rdf:parseType=\"Resource\">");
WriteNewline();
SerializeCompactRdfElementProps(node, indent + 1);
}
else
{
// Have a mix of attributes and elements, use an inner rdf:Description.
Write('>');
WriteNewline();
WriteIndent(indent + 1);
Write(RdfStructStart);
SerializeCompactRdfAttrProps(node, indent + 2);
Write(">");
WriteNewline();
SerializeCompactRdfElementProps(node, indent + 1);
WriteIndent(indent + 1);
Write(RdfStructEnd);
WriteNewline();
}
return(emitEndTag);
}
/// <summary>
/// Recursively handles the "value" for a node that must be written as an RDF
/// property element.
/// </summary>
/// <remarks>
/// Recursively handles the "value" for a node that must be written as an RDF
/// property element. It does not matter if it is a top level property, a
/// field of a struct, or an item of an array. The indent is that for the
/// property element. The patterns below ignore attribute qualifiers such as
/// xml:lang, they don't affect the output form.
/// <code>
/// <ns:UnqualifiedStructProperty-1
/// ... The fields as attributes, if all are simple and unqualified
/// />
/// <ns:UnqualifiedStructProperty-2 rdf:parseType="Resource">
/// ... The fields as elements, if none are simple and unqualified
/// </ns:UnqualifiedStructProperty-2>
/// <ns:UnqualifiedStructProperty-3>
/// <rdf:Description
/// ... The simple and unqualified fields as attributes
/// >
/// ... The compound or qualified fields as elements
/// </rdf:Description>
/// </ns:UnqualifiedStructProperty-3>
/// <ns:UnqualifiedArrayProperty>
/// <rdf:Bag> or Seq or Alt
/// ... Array items as rdf:li elements, same forms as top level properties
/// </rdf:Bag>
/// </ns:UnqualifiedArrayProperty>
/// <ns:QualifiedProperty rdf:parseType="Resource">
/// <rdf:value> ... Property "value"
/// following the unqualified forms ... </rdf:value>
/// ... Qualifiers looking like named struct fields
/// </ns:QualifiedProperty>
/// </code>
/// *** Consider numbered array items, but has compatibility problems.
/// Consider qualified form with rdf:Description and attributes.
/// </remarks>
/// <param name="parentNode">the parent node</param>
/// <param name="indent">the current indent level</param>
/// <exception cref="System.IO.IOException">Forwards writer exceptions</exception>
/// <exception cref="XmpException">If qualifier and element fields are mixed.</exception>
private void SerializeCompactRdfElementProps(XmpNode parentNode, int indent)
{
for (var it = parentNode.IterateChildren(); it.HasNext();)
{
var node = (XmpNode)it.Next();
if (CanBeRdfAttrProp(node))
{
continue;
}
var emitEndTag = true;
var indentEndTag = true;
// Determine the XML element name, write the name part of the start tag. Look over the
// qualifiers to decide on "normal" versus "rdf:value" form. Emit the attribute
// qualifiers at the same time.
var elemName = node.Name;
if (elemName == XmpConstants.ArrayItemName)
{
elemName = XmpConstants.RdfLi;
}
WriteIndent(indent);
Write('<');
Write(elemName);
var hasGeneralQualifiers = false;
var hasRdfResourceQual = false;
for (var iq = node.IterateQualifier(); iq.HasNext();)
{
var qualifier = (XmpNode)iq.Next();
if (!RdfAttrQualifier.Contains(qualifier.Name))
{
hasGeneralQualifiers = true;
}
else
{
hasRdfResourceQual = qualifier.Name == "rdf:resource";
Write(' ');
Write(qualifier.Name);
Write("=\"");
AppendNodeValue(qualifier.Value, true);
Write('"');
}
}
// Process the property according to the standard patterns.
if (hasGeneralQualifiers)
{
SerializeCompactRdfGeneralQualifier(indent, node);
}
else
{
// This node has only attribute qualifiers. Emit as a property element.
if (!node.Options.IsCompositeProperty)
{
var result = SerializeCompactRdfSimpleProp(node);
emitEndTag = (bool)result[0];
indentEndTag = (bool)result[1];
}
else
{
if (node.Options.IsArray)
{
SerializeCompactRdfArrayProp(node, indent);
}
else
{
emitEndTag = SerializeCompactRdfStructProp(node, indent, hasRdfResourceQual);
}
}
}
// Emit the property element end tag.
if (emitEndTag)
{
if (indentEndTag)
{
WriteIndent(indent);
}
Write("</");
Write(elemName);
Write('>');
WriteNewline();
}
}
}