/// <seealso cref="Com.Adobe.Xmp.XMPMeta.Iterator(Com.Adobe.Xmp.Options.IteratorOptions)"/>
/// <exception cref="Com.Adobe.Xmp.XMPException"/>
public virtual XMPIterator Iterator(IteratorOptions options)
{
return Iterator(null, null, options);
}
/// <seealso cref="Com.Adobe.Xmp.XMPMeta.Iterator(string, string, Com.Adobe.Xmp.Options.IteratorOptions)"/>
/// <exception cref="Com.Adobe.Xmp.XMPException"/>
public virtual XMPIterator Iterator(string schemaNS, string propName, IteratorOptions options)
{
return new XMPIteratorImpl(this, schemaNS, propName, options);
}
/// <summary>Constructor with optionsl initial values.</summary>
/// <remarks>
/// Constructor with optionsl initial values. If <code>propName</code> is provided,
/// <code>schemaNS</code> has also be provided.
/// </remarks>
/// <param name="xmp">the iterated metadata object.</param>
/// <param name="schemaNS">the iteration is reduced to this schema (optional)</param>
/// <param name="propPath">the iteration is redurce to this property within the <code>schemaNS</code></param>
/// <param name="options">
/// advanced iteration options, see
/// <see cref="Com.Adobe.Xmp.Options.IteratorOptions"/>
/// </param>
/// <exception cref="Com.Adobe.Xmp.XMPException">If the node defined by the paramters is not existing.</exception>
public XMPIteratorImpl(XMPMetaImpl xmp, string schemaNS, string propPath, IteratorOptions options)
{
// make sure that options is defined at least with defaults
this.options = options != null ? options : new IteratorOptions();
// the start node of the iteration depending on the schema and property filter
XMPNode startNode = null;
string initialPath = null;
bool baseSchema = schemaNS != null && schemaNS.Length > 0;
bool baseProperty = propPath != null && propPath.Length > 0;
if (!baseSchema && !baseProperty)
{
// complete tree will be iterated
startNode = xmp.GetRoot();
}
else
{
if (baseSchema && baseProperty)
{
// Schema and property node provided
XMPPath path = XMPPathParser.ExpandXPath(schemaNS, propPath);
// base path is the prop path without the property leaf
XMPPath basePath = new XMPPath();
for (int i = 0; i < path.Size() - 1; i++)
{
basePath.Add(path.GetSegment(i));
}
startNode = XMPNodeUtils.FindNode(xmp.GetRoot(), path, false, null);
baseNS = schemaNS;
initialPath = basePath.ToString();
}
else
{
if (baseSchema && !baseProperty)
{
// Only Schema provided
startNode = XMPNodeUtils.FindSchemaNode(xmp.GetRoot(), schemaNS, false);
}
else
{
// !baseSchema && baseProperty
// No schema but property provided -> error
throw new XMPException("Schema namespace URI is required", XMPErrorConstants.Badschema);
}
}
}
// create iterator
if (startNode != null)
{
if (!this.options.IsJustChildren())
{
nodeIterator = new XMPIteratorImpl.NodeIterator(this, startNode, initialPath, 1);
}
else
{
nodeIterator = new XMPIteratorImpl.NodeIteratorChildren(this, startNode, initialPath);
}
}
else
{
// create null iterator
nodeIterator = Sharpen.Collections.EmptyList().Iterator();
}
}