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public GetChild ( int index ) : |
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| index | int | an index [1..size] |
| return | ||
/// <summary>
/// Undo the denormalization performed by the XMP used in Acrobat 5.<br>
/// If a Dublin Core array had only one item, it was serialized as a simple
/// property. <br>
/// The <code>xml:lang</code> attribute was dropped from an
/// <code>alt-text</code> item if the language was <code>x-default</code>.
/// </summary>
/// <param name="dcSchema"> the DC schema node </param>
/// <exception cref="XmpException"> Thrown if normalization fails </exception>
private static void NormalizeDcArrays(XmpNode dcSchema)
{
for (int i = 1; i <= dcSchema.ChildrenLength; i++)
{
XmpNode currProp = dcSchema.GetChild(i);
PropertyOptions arrayForm = (PropertyOptions)_dcArrayForms[currProp.Name];
if (arrayForm == null)
{
continue;
}
if (currProp.Options.Simple)
{
// create a new array and add the current property as child,
// if it was formerly simple
XmpNode newArray = new XmpNode(currProp.Name, arrayForm);
currProp.Name = XmpConst.ARRAY_ITEM_NAME;
newArray.AddChild(currProp);
dcSchema.ReplaceChild(i, newArray);
// fix language alternatives
if (arrayForm.ArrayAltText && !currProp.Options.HasLanguage)
{
XmpNode newLang = new XmpNode(XmpConst.XML_LANG, XmpConst.X_DEFAULT, null);
currProp.AddQualifier(newLang);
}
}
else
{
// clear array options and add corrected array form if it has been an array before
currProp.Options.SetOption(
PropertyOptions.ARRAY | PropertyOptions.ARRAY_ORDERED | PropertyOptions.ARRAY_ALTERNATE |
PropertyOptions.ARRAY_ALT_TEXT, false);
currProp.Options.MergeWith(arrayForm);
if (arrayForm.ArrayAltText)
{
// applying for "dc:description", "dc:rights", "dc:title"
RepairAltText(currProp);
}
}
}
}
/// <summary>
/// The parent is an RDF pseudo-struct containing an rdf:value field. Fix the
/// XMP data model. The rdf:value node must be the first child, the other
/// children are qualifiers. The form, value, and children of the rdf:value
/// node are the real ones. The rdf:value node's qualifiers must be added to
/// the others.
/// </summary>
/// <param name="xmpParent"> the parent xmp node </param>
/// <exception cref="XmpException"> thown on parsing errors </exception>
private static void FixupQualifiedNode(XmpNode xmpParent) {
Debug.Assert(xmpParent.Options.Struct && xmpParent.HasChildren());
XmpNode valueNode = xmpParent.GetChild(1);
Debug.Assert("rdf:value".Equals(valueNode.Name));
// Move the qualifiers on the value node to the parent.
// Make sure an xml:lang qualifier stays at the front.
// Check for duplicate names between the value node's qualifiers and the parent's children.
// The parent's children are about to become qualifiers. Check here, between the groups.
// Intra-group duplicates are caught by XMPNode#addChild(...).
if (valueNode.Options.HasLanguage) {
if (xmpParent.Options.HasLanguage) {
throw new XmpException("Redundant xml:lang for rdf:value element", XmpError.BADXMP);
}
XmpNode langQual = valueNode.GetQualifier(1);
valueNode.RemoveQualifier(langQual);
xmpParent.AddQualifier(langQual);
}
// Start the remaining copy after the xml:lang qualifier.
for (int i = 1; i <= valueNode.QualifierLength; i++) {
XmpNode qualifier = valueNode.GetQualifier(i);
xmpParent.AddQualifier(qualifier);
}
// Change the parent's other children into qualifiers.
// This loop starts at 1, child 0 is the rdf:value node.
for (int i = 2; i <= xmpParent.ChildrenLength; i++) {
XmpNode qualifier = xmpParent.GetChild(i);
xmpParent.AddQualifier(qualifier);
}
// Move the options and value last, other checks need the parent's original options.
// Move the value node's children to be the parent's children.
Debug.Assert(xmpParent.Options.Struct || xmpParent.HasValueChild);
xmpParent.HasValueChild = false;
xmpParent.Options.Struct = false;
xmpParent.Options.MergeWith(valueNode.Options);
xmpParent.Value = valueNode.Value;
xmpParent.RemoveChildren();
for (IEnumerator it = valueNode.IterateChildren(); it.MoveNext();) {
XmpNode child = (XmpNode) it.Current;
xmpParent.AddChild(child);
}
}
/// <summary>
/// Looks for the appropriate language item in a text alternative array.item
/// </summary>
/// <param name="arrayNode">
/// an array node </param>
/// <param name="language">
/// the requested language </param>
/// <returns> Returns the index if the language has been found, -1 otherwise. </returns>
/// <exception cref="XmpException"> </exception>
internal static int LookupLanguageItem(XmpNode arrayNode, string language) {
if (!arrayNode.Options.Array) {
throw new XmpException("Language item must be used on array", XmpError.BADXPATH);
}
for (int index = 1; index <= arrayNode.ChildrenLength; index++) {
XmpNode child = arrayNode.GetChild(index);
if (!child.HasQualifier() || !XML_LANG.Equals(child.GetQualifier(1).Name)) {
continue;
}
if (language.Equals(child.GetQualifier(1).Value)) {
return index;
}
}
return -1;
}
/// <summary>
/// <ol>
/// <li>Look for an exact match with the specific language.
/// <li>If a generic language is given, look for partial matches.
/// <li>Look for an "x-default"-item.
/// <li>Choose the first item.
/// </ol>
/// </summary>
/// <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"> </exception>
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.ArrayAltText) {
throw new XmpException("Localized text array is not alt-text", XmpError.BADXPATH);
}
if (!arrayNode.HasChildren()) {
return new object[] {CLT_NO_VALUES, null};
}
int foundGenericMatches = 0;
XmpNode resultNode = null;
XmpNode xDefault = null;
// Look for the first partial match with the generic language.
for (IEnumerator it = arrayNode.IterateChildren(); it.MoveNext();) {
XmpNode currItem = (XmpNode) it.Current;
// perform some checks on the current item
if (currItem == null || currItem.Options == null || currItem.Options.CompositeProperty) {
throw new XmpException("Alt-text array item is not simple", XmpError.BADXPATH);
}
if (!currItem.HasQualifier() || !XML_LANG.Equals(currItem.GetQualifier(1).Name)) {
throw new XmpException("Alt-text array item has no language qualifier", XmpError.BADXPATH);
}
string currLang = currItem.GetQualifier(1).Value;
// Look for an exact match with the specific language.
if (specificLang.Equals(currLang)) {
return new object[] {CLT_SPECIFIC_MATCH, 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 (X_DEFAULT.Equals(currLang)) {
xDefault = currItem;
}
}
// evaluate loop
if (foundGenericMatches == 1) {
return new object[] {CLT_SINGLE_GENERIC, resultNode};
}
if (foundGenericMatches > 1) {
return new object[] {CLT_MULTIPLE_GENERIC, resultNode};
}
if (xDefault != null) {
return new object[] {CLT_XDEFAULT, xDefault};
}
{
// Everything failed, choose the first item.
return new object[] {CLT_FIRST_ITEM, arrayNode.GetChild(1)};
}
}
/// <summary>
/// Make sure the x-default item is first. Touch up "single value"
/// arrays that have a default plus one real language. This case should have
/// the same value for both items. Older Adobe apps were hardwired to only
/// use the "x-default" item, so we copy that value to the other
/// item.
/// </summary>
/// <param name="arrayNode">
/// an alt text array node </param>
internal static void NormalizeLangArray(XmpNode arrayNode) {
if (!arrayNode.Options.ArrayAltText) {
return;
}
// check if node with x-default qual is first place
for (int i = 2; i <= arrayNode.ChildrenLength; i++) {
XmpNode child = arrayNode.GetChild(i);
if (child.HasQualifier() && X_DEFAULT.Equals(child.GetQualifier(1).Value)) {
// move node to first place
try {
arrayNode.RemoveChild(i);
arrayNode.AddChild(1, child);
}
catch (XmpException) {
// cannot occur, because same child is removed before
Debug.Assert(false);
}
if (i == 2) {
arrayNode.GetChild(2).Value = child.Value;
}
break;
}
}
}
/// <summary>
/// Searches for a qualifier selector in a node:
/// [?qualName="value"] - an element in an array, chosen by a qualifier value.
/// No implicit nodes are created for qualifier selectors,
/// except for an alias to an x-default item.
/// </summary>
/// <param name="arrayNode"> an array node </param>
/// <param name="qualName"> the qualifier name </param>
/// <param name="qualValue"> the qualifier value </param>
/// <param name="aliasForm"> in case the qual selector results from an alias,
/// an x-default node is created if there has not been one. </param>
/// <returns> Returns the index of th </returns>
/// <exception cref="XmpException"> </exception>
private static int LookupQualSelector(XmpNode arrayNode, string qualName, string qualValue, uint aliasForm) {
if (XML_LANG.Equals(qualName)) {
qualValue = Utils.NormalizeLangValue(qualValue);
int index = LookupLanguageItem(arrayNode, qualValue);
if (index < 0 && (aliasForm & AliasOptions.PROP_ARRAY_ALT_TEXT) > 0) {
XmpNode langNode = new XmpNode(ARRAY_ITEM_NAME, null);
XmpNode xdefault = new XmpNode(XML_LANG, X_DEFAULT, null);
langNode.AddQualifier(xdefault);
arrayNode.AddChild(1, langNode);
return 1;
}
return index;
}
for (int index = 1; index < arrayNode.ChildrenLength; index++) {
XmpNode currItem = arrayNode.GetChild(index);
for (IEnumerator it = currItem.IterateQualifier(); it.MoveNext();) {
XmpNode qualifier = (XmpNode) it.Current;
if (qualifier != null && qualName.Equals(qualifier.Name) && qualValue.Equals(qualifier.Value)) {
return index;
}
}
}
return -1;
}
/// <summary>
/// Searches for a field selector in a node:
/// [fieldName="value] - an element in an array of structs, chosen by a field value.
/// No implicit nodes are created by field selectors.
/// </summary>
/// <param name="arrayNode"> </param>
/// <param name="fieldName"> </param>
/// <param name="fieldValue"> </param>
/// <returns> Returns the index of the field if found, otherwise -1. </returns>
/// <exception cref="XmpException"> </exception>
private static int LookupFieldSelector(XmpNode arrayNode, string fieldName, string fieldValue) {
int result = -1;
for (int index = 1; index <= arrayNode.ChildrenLength && result < 0; index++) {
XmpNode currItem = arrayNode.GetChild(index);
if (!currItem.Options.Struct) {
throw new XmpException("Field selector must be used on array of struct", XmpError.BADXPATH);
}
for (int f = 1; f <= currItem.ChildrenLength; f++) {
XmpNode currField = currItem.GetChild(f);
if (!fieldName.Equals(currField.Name)) {
continue;
}
if (fieldValue.Equals(currField.Value)) {
result = index;
break;
}
}
}
return result;
}
/// <summary>
/// After processing by ExpandXPath, a step can be of these forms:
/// <ul>
/// <li>qualName - A top level property or struct field.
/// <li>[index] - An element of an array.
/// <li>[last()] - The last element of an array.
/// <li>[qualName="value"] - An element in an array of structs, chosen by a field value.
/// <li>[?qualName="value"] - An element in an array, chosen by a qualifier value.
/// <li>?qualName - A general qualifier.
/// </ul>
/// Find the appropriate child node, resolving aliases, and optionally creating nodes.
/// </summary>
/// <param name="parentNode"> the node to start to start from </param>
/// <param name="nextStep"> the xpath segment </param>
/// <param name="createNodes"> </param>
/// <returns> returns the found or created XmpPath node </returns>
/// <exception cref="XmpException"> </exception>
private static XmpNode FollowXPathStep(XmpNode parentNode, XmpPathSegment nextStep, bool createNodes) {
XmpNode nextNode = null;
uint stepKind = nextStep.Kind;
if (stepKind == XmpPath.STRUCT_FIELD_STEP) {
nextNode = FindChildNode(parentNode, nextStep.Name, createNodes);
}
else if (stepKind == XmpPath.QUALIFIER_STEP) {
nextNode = FindQualifierNode(parentNode, nextStep.Name.Substring(1), createNodes);
}
else {
// This is an array indexing step. First get the index, then get the node.
int index;
if (!parentNode.Options.Array) {
throw new XmpException("Indexing applied to non-array", XmpError.BADXPATH);
}
if (stepKind == XmpPath.ARRAY_INDEX_STEP) {
index = FindIndexedItem(parentNode, nextStep.Name, createNodes);
}
else if (stepKind == XmpPath.ARRAY_LAST_STEP) {
index = parentNode.ChildrenLength;
}
else if (stepKind == XmpPath.FIELD_SELECTOR_STEP) {
string[] result = Utils.SplitNameAndValue(nextStep.Name);
string fieldName = result[0];
string fieldValue = result[1];
index = LookupFieldSelector(parentNode, fieldName, fieldValue);
}
else if (stepKind == XmpPath.QUAL_SELECTOR_STEP) {
string[] result = Utils.SplitNameAndValue(nextStep.Name);
string qualName = result[0];
string qualValue = result[1];
index = LookupQualSelector(parentNode, qualName, qualValue, nextStep.AliasForm);
}
else {
throw new XmpException("Unknown array indexing step in FollowXPathStep",
XmpError.INTERNALFAILURE);
}
if (1 <= index && index <= parentNode.ChildrenLength) {
nextNode = parentNode.GetChild(index);
}
}
return nextNode;
}
/// <summary>
/// Undo the denormalization performed by the XMP used in Acrobat 5.<br>
/// If a Dublin Core array had only one item, it was serialized as a simple
/// property. <br>
/// The <code>xml:lang</code> attribute was dropped from an
/// <code>alt-text</code> item if the language was <code>x-default</code>.
/// </summary>
/// <param name="dcSchema"> the DC schema node </param>
/// <exception cref="XmpException"> Thrown if normalization fails </exception>
private static void NormalizeDcArrays(XmpNode dcSchema) {
for (int i = 1; i <= dcSchema.ChildrenLength; i++) {
XmpNode currProp = dcSchema.GetChild(i);
PropertyOptions arrayForm = (PropertyOptions) _dcArrayForms[currProp.Name];
if (arrayForm == null) {
continue;
}
if (currProp.Options.Simple) {
// create a new array and add the current property as child,
// if it was formerly simple
XmpNode newArray = new XmpNode(currProp.Name, arrayForm);
currProp.Name = XmpConst.ARRAY_ITEM_NAME;
newArray.AddChild(currProp);
dcSchema.ReplaceChild(i, newArray);
// fix language alternatives
if (arrayForm.ArrayAltText && !currProp.Options.HasLanguage) {
XmpNode newLang = new XmpNode(XmpConst.XML_LANG, XmpConst.X_DEFAULT, null);
currProp.AddQualifier(newLang);
}
}
else {
// clear array options and add corrected array form if it has been an array before
currProp.Options.SetOption(
PropertyOptions.ARRAY | PropertyOptions.ARRAY_ORDERED | PropertyOptions.ARRAY_ALTERNATE |
PropertyOptions.ARRAY_ALT_TEXT, false);
currProp.Options.MergeWith(arrayForm);
if (arrayForm.ArrayAltText) {
// applying for "dc:description", "dc:rights", "dc:title"
RepairAltText(currProp);
}
}
}
}