/// <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>
/// 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>
/// A node can be serialized as RDF-Attribute, if it meets the following conditions:
/// <ul>
/// <li>is not array item
/// <li>don't has qualifier
/// <li>is no URI
/// <li>is no composite property
/// </ul>
/// </summary>
/// <param name="node"> an XMPNode </param>
/// <returns> Returns true if the node serialized as RDF-Attribute </returns>
private bool canBeRDFAttrProp(XmpNode node) {
return !node.HasQualifier() && !node.Options.Uri && !node.Options.CompositeProperty &&
!XmpConst.ARRAY_ITEM_NAME.Equals(node.Name);
}
/// <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) });
}
}
/// <seealso cref= XMPUtilsImpl#appendProperties(XMPMeta, XMPMeta, boolean, boolean, boolean) </seealso>
/// <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"> </exception>
private static void AppendSubtree(XmpMetaImpl destXmp, XmpNode sourceNode, XmpNode destParent,
bool replaceOldValues, bool deleteEmptyValues)
{
XmpNode destNode = XmpNodeUtils.FindChildNode(destParent, sourceNode.Name, false);
bool valueIsEmpty = false;
if (deleteEmptyValues)
{
valueIsEmpty = sourceNode.Options.Simple
? 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.
PropertyOptions sourceForm = sourceNode.Options;
PropertyOptions destForm = destNode.Options;
if (sourceForm != destForm)
{
return;
}
if (sourceForm.Struct)
{
// 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 (IEnumerator it = sourceNode.IterateChildren(); it.MoveNext();)
{
XmpNode sourceField = (XmpNode)it.Current;
if (sourceField == null)
{
continue;
}
AppendSubtree(destXmp, sourceField, destNode, replaceOldValues, deleteEmptyValues);
if (deleteEmptyValues && !destNode.HasChildren())
{
destParent.RemoveChild(destNode);
}
}
}
else if (sourceForm.ArrayAltText)
{
// 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 (IEnumerator it = sourceNode.IterateChildren(); it.MoveNext();)
{
XmpNode sourceItem = (XmpNode)it.Current;
if (sourceItem == null)
{
continue;
}
if (!sourceItem.HasQualifier() || !XML_LANG.Equals(sourceItem.GetQualifier(1).Name))
{
continue;
}
int 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 (!X_DEFAULT.Equals(sourceItem.GetQualifier(1).Value) || !destNode.HasChildren())
{
sourceItem.CloneSubtree(destNode);
}
else
{
XmpNode destItem = new XmpNode(sourceItem.Name, sourceItem.Value, sourceItem.Options);
sourceItem.CloneSubtree(destItem);
destNode.AddChild(1, destItem);
}
}
}
}
else if (sourceForm.Array)
{
// 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 (IEnumerator @is = sourceNode.IterateChildren(); @is.MoveNext();)
{
XmpNode sourceItem = (XmpNode)@is.Current;
if (sourceItem == null)
{
continue;
}
bool match = false;
for (IEnumerator id = destNode.IterateChildren(); id.MoveNext();)
{
XmpNode destItem = (XmpNode)id.Current;
if (destItem == null)
{
continue;
}
if (ItemValuesMatch(sourceItem, destItem))
{
match = true;
}
}
if (!match)
{
destNode = (XmpNode)sourceItem.Clone();
destParent.AddChild(destNode);
}
}
}
}
}