com.sun.xml.wss.impl.dsig.DOMSubTreeData Maven / Gradle / Ivy
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/*
* $Id: DOMSubTreeData.java,v 1.2 2010-10-21 15:37:28 snajper Exp $
*/
package com.sun.xml.wss.impl.dsig;
import javax.xml.crypto.NodeSetData;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
* This is a subtype of NodeSetData that represents a dereferenced
* same-document URI as the root of a subdocument. The main reason is
* for efficiency and performance, as some transforms can operate
* directly on the subdocument and there is no need to convert it
* first to an XPath node-set.
*/
public class DOMSubTreeData implements NodeSetData {
private boolean excludeComments;
private Iterator ni;
private Node root;
public DOMSubTreeData(Node root, boolean excludeComments) {
this.root = root;
this.ni = new DelayedNodeIterator(root, excludeComments);
this.excludeComments = excludeComments;
}
public Iterator iterator() {
return ni;
}
public Node getRoot() {
return root;
}
public boolean excludeComments() {
return excludeComments;
}
/**
* This is an Iterator that contains a backing node-set that is
* not populated until the caller first attempts to advance the iterator.
*/
static class DelayedNodeIterator implements Iterator {
private Node root;
private List nodeSet;
private ListIterator li;
private boolean withComments;
DelayedNodeIterator(Node root, boolean excludeComments) {
this.root = root;
this.withComments = !excludeComments;
}
public boolean hasNext() {
if (nodeSet == null) {
nodeSet = dereferenceSameDocumentURI(root);
li = nodeSet.listIterator();
}
return li.hasNext();
}
public Object next() {
if (nodeSet == null) {
nodeSet = dereferenceSameDocumentURI(root);
li = nodeSet.listIterator();
}
if (li.hasNext()) {
return (Node) li.next();
} else {
throw new NoSuchElementException();
}
}
public void remove() {
throw new UnsupportedOperationException();
}
/**
* Dereferences a same-document URI fragment.
*
* @param node the node (document or element) referenced by the
* URI fragment. If null, returns an empty set.
* @return a set of nodes (minus any comment nodes)
*/
private List dereferenceSameDocumentURI(Node node) {
List nodeSet = new ArrayList();
if (node != null) {
nodeSetMinusCommentNodes(node, nodeSet, null);
}
return nodeSet;
}
/**
* Recursively traverses the subtree, and returns an XPath-equivalent
* node-set of all nodes traversed, excluding any comment nodes,
* if specified.
*
* @param node the node to traverse
* @param nodeSet the set of nodes traversed so far
* @param the previous sibling node
*/
@SuppressWarnings("unchecked")
private void nodeSetMinusCommentNodes(Node node, List nodeSet,
Node prevSibling) {
switch (node.getNodeType()) {
case Node.ELEMENT_NODE :
NamedNodeMap attrs = node.getAttributes();
if (attrs != null) {
for (int i = 0; i