/// <summary>
/// Tweak old XMP: Move an instance ID from rdf:about to the
/// <em>xmpMM:InstanceID</em> property.
/// </summary>
/// <remarks>
/// Tweak old XMP: Move an instance ID from rdf:about to the
/// <em>xmpMM:InstanceID</em> property. An old instance ID usually looks
/// like "uuid:bac965c4-9d87-11d9-9a30-000d936b79c4", plus InDesign
/// 3.0 wrote them like "bac965c4-9d87-11d9-9a30-000d936b79c4". If
/// the name looks like a UUID simply move it to <em>xmpMM:InstanceID</em>,
/// don't worry about any existing <em>xmpMM:InstanceID</em>. Both will
/// only be present when a newer file with the <em>xmpMM:InstanceID</em>
/// property is updated by an old app that uses <em>rdf:about</em>.
/// </remarks>
/// <param name="tree">the root of the metadata tree</param>
/// <exception cref="iText.Kernel.XMP.XMPException">Thrown if tweaking fails.</exception>
private static void TweakOldXMP(XMPNode tree)
{
if (tree.GetName() != null && tree.GetName().Length >= Utils.UUID_LENGTH)
{
String nameStr = tree.GetName().ToLower();
if (nameStr.StartsWith("uuid:"))
{
nameStr = nameStr.Substring(5);
}
if (Utils.CheckUUIDFormat(nameStr))
{
// move UUID to xmpMM:InstanceID and remove it from the root node
XMPPath path = XMPPathParser.ExpandXPath(XMPConst.NS_XMP_MM, "InstanceID");
XMPNode idNode = XMPNodeUtils.FindNode(tree, path, true, null);
if (idNode != null)
{
idNode.SetOptions(null);
// Clobber any existing xmpMM:InstanceID.
idNode.SetValue("uuid:" + nameStr);
idNode.RemoveChildren();
idNode.RemoveQualifiers();
tree.SetName(null);
}
else
{
throw new XMPException("Failure creating xmpMM:InstanceID", XMPError.INTERNALFAILURE
);
}
}
}
}
/// <summary>
/// The internals for setProperty() and related calls, used after the node is
/// found or created.
/// </summary>
/// <param name="node">the newly created node</param>
/// <param name="value">the node value, can be <code>null</code></param>
/// <param name="newOptions">options for the new node, must not be <code>null</code>.
/// </param>
/// <param name="deleteExisting">flag if the existing value is to be overwritten</param>
/// <exception cref="iText.Kernel.XMP.XMPException">thrown if options and value do not correspond</exception>
internal virtual void SetNode(XMPNode node, Object value, PropertyOptions newOptions
, bool deleteExisting)
{
if (deleteExisting)
{
node.Clear();
}
// its checked by setOptions(), if the merged result is a valid options set
node.GetOptions().MergeWith(newOptions);
if (!node.GetOptions().IsCompositeProperty())
{
// This is setting the value of a leaf node.
XMPNodeUtils.SetNodeValue(node, value);
}
else
{
if (value != null && value.ToString().Length > 0)
{
throw new XMPException("Composite nodes can't have values", XMPError.BADXPATH);
}
node.RemoveChildren();
}
}