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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.xml.security.c14n.implementations;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Set;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.CanonicalizerSpi;
import org.apache.xml.security.c14n.helper.AttrCompare;
import org.apache.xml.security.signature.NodeFilter;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.utils.Constants;
import org.apache.xml.security.utils.UnsyncByteArrayOutputStream;
import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Comment;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.ProcessingInstruction;
import org.xml.sax.SAXException;
/**
* Abstract base class for canonicalization algorithms.
* Please note that these implementations are NOT thread safe - please see the following JIRA for more information:
* https://issues.apache.org/jira/browse/SANTUARIO-463
*/
public abstract class CanonicalizerBase extends CanonicalizerSpi {
public static final String XML = "xml";
public static final String XMLNS = "xmlns";
public static final String XMLNS_URI = Constants.NamespaceSpecNS;
public static final String XML_LANG_URI = Constants.XML_LANG_SPACE_SpecNS;
protected static final AttrCompare COMPARE = new AttrCompare();
// Make sure you clone the following mutable arrays before passing to
// potentially untrusted objects such as OutputStreams.
private static final byte[] END_PI = {'?','>'};
private static final byte[] BEGIN_PI = {'<','?'};
private static final byte[] END_COMM = {'-','-','>'};
private static final byte[] BEGIN_COMM = {'<','!','-','-'};
private static final byte[] XA = {'&','#','x','A',';'};
private static final byte[] X9 = {'&','#','x','9',';'};
private static final byte[] QUOT = {'&','q','u','o','t',';'};
private static final byte[] XD = {'&','#','x','D',';'};
private static final byte[] GT = {'&','g','t',';'};
private static final byte[] LT = {'&','l','t',';'};
private static final byte[] END_TAG = {'<','/'};
private static final byte[] AMP = {'&','a','m','p',';'};
private static final byte[] EQUALS_STR = {'=','\"'};
protected static final int NODE_BEFORE_DOCUMENT_ELEMENT = -1;
protected static final int NODE_NOT_BEFORE_OR_AFTER_DOCUMENT_ELEMENT = 0;
protected static final int NODE_AFTER_DOCUMENT_ELEMENT = 1;
private List nodeFilter;
private boolean includeComments;
private Set xpathNodeSet;
/**
* The node to be skipped/excluded from the DOM tree
* in subtree canonicalizations.
*/
private Node excludeNode;
private OutputStream writer = new ByteArrayOutputStream();
/**
* The null xmlns definition.
*/
private Attr nullNode;
/**
* Constructor CanonicalizerBase
*
* @param includeComments
*/
public CanonicalizerBase(boolean includeComments) {
this.includeComments = includeComments;
}
/**
* Method engineCanonicalizeSubTree
* {@inheritDoc}
* @param rootNode
* @throws CanonicalizationException
*/
public byte[] engineCanonicalizeSubTree(Node rootNode)
throws CanonicalizationException {
return engineCanonicalizeSubTree(rootNode, (Node)null);
}
/**
* Method engineCanonicalizeXPathNodeSet
* {@inheritDoc}
* @param xpathNodeSet
* @throws CanonicalizationException
*/
public byte[] engineCanonicalizeXPathNodeSet(Set xpathNodeSet)
throws CanonicalizationException {
this.xpathNodeSet = xpathNodeSet;
return engineCanonicalizeXPathNodeSetInternal(XMLUtils.getOwnerDocument(this.xpathNodeSet));
}
/**
* Canonicalizes a Subtree node.
* @param input the root of the subtree to canicalize
* @return The canonicalize stream.
* @throws CanonicalizationException
*/
public byte[] engineCanonicalize(XMLSignatureInput input) throws CanonicalizationException {
try {
if (input.isExcludeComments()) {
includeComments = false;
}
if (input.isOctetStream()) {
return engineCanonicalize(input.getBytes());
}
if (input.isElement()) {
return engineCanonicalizeSubTree(input.getSubNode(), input.getExcludeNode());
} else if (input.isNodeSet()) {
nodeFilter = input.getNodeFilters();
circumventBugIfNeeded(input);
if (input.getSubNode() != null) {
return engineCanonicalizeXPathNodeSetInternal(input.getSubNode());
} else {
return engineCanonicalizeXPathNodeSet(input.getNodeSet());
}
}
return null;
} catch (ParserConfigurationException ex) {
throw new CanonicalizationException(ex);
} catch (IOException ex) {
throw new CanonicalizationException(ex);
} catch (SAXException ex) {
throw new CanonicalizationException(ex);
}
}
/**
* @param writer The writer to set.
*/
public void setWriter(OutputStream writer) {
this.writer = writer;
}
protected OutputStream getWriter() {
return writer;
}
/**
* Canonicalizes a Subtree node.
*
* @param rootNode
* the root of the subtree to canonicalize
* @param excludeNode
* a node to be excluded from the canonicalize operation
* @return The canonicalize stream.
* @throws CanonicalizationException
*/
protected byte[] engineCanonicalizeSubTree(Node rootNode, Node excludeNode)
throws CanonicalizationException {
this.excludeNode = excludeNode;
try {
NameSpaceSymbTable ns = new NameSpaceSymbTable();
int nodeLevel = NODE_BEFORE_DOCUMENT_ELEMENT;
if (rootNode != null && Node.ELEMENT_NODE == rootNode.getNodeType()) {
//Fills the nssymbtable with the definitions of the parent of the root subnode
getParentNameSpaces((Element)rootNode, ns);
nodeLevel = NODE_NOT_BEFORE_OR_AFTER_DOCUMENT_ELEMENT;
}
this.canonicalizeSubTree(rootNode, ns, rootNode, nodeLevel);
this.writer.flush();
if (this.writer instanceof ByteArrayOutputStream) {
byte[] result = ((ByteArrayOutputStream)this.writer).toByteArray();
if (reset) {
((ByteArrayOutputStream)this.writer).reset();
} else {
this.writer.close();
}
return result;
} else if (this.writer instanceof UnsyncByteArrayOutputStream) {
byte[] result = ((UnsyncByteArrayOutputStream)this.writer).toByteArray();
if (reset) {
((UnsyncByteArrayOutputStream)this.writer).reset();
} else {
this.writer.close();
}
return result;
} else {
this.writer.close();
}
return null;
} catch (UnsupportedEncodingException ex) {
throw new CanonicalizationException(ex);
} catch (IOException ex) {
throw new CanonicalizationException(ex);
}
}
/**
* Method canonicalizeSubTree, this function is a recursive one.
*
* @param currentNode
* @param ns
* @param endnode
* @throws CanonicalizationException
* @throws IOException
*/
protected final void canonicalizeSubTree(
Node currentNode, NameSpaceSymbTable ns, Node endnode, int documentLevel
) throws CanonicalizationException, IOException {
if (currentNode == null || isVisibleInt(currentNode) == -1) {
return;
}
Node sibling = null;
Node parentNode = null;
final OutputStream writer = this.writer;
final Node excludeNode = this.excludeNode;
final boolean includeComments = this.includeComments;
Map cache = new HashMap<>();
do {
switch (currentNode.getNodeType()) {
case Node.ENTITY_NODE :
case Node.NOTATION_NODE :
case Node.ATTRIBUTE_NODE :
// illegal node type during traversal
throw new CanonicalizationException("empty",
new Object[]{"illegal node type during traversal"});
case Node.DOCUMENT_FRAGMENT_NODE :
case Node.DOCUMENT_NODE :
ns.outputNodePush();
sibling = currentNode.getFirstChild();
break;
case Node.COMMENT_NODE :
if (includeComments) {
outputCommentToWriter((Comment) currentNode, writer, documentLevel);
}
break;
case Node.PROCESSING_INSTRUCTION_NODE :
outputPItoWriter((ProcessingInstruction) currentNode, writer, documentLevel);
break;
case Node.TEXT_NODE :
case Node.CDATA_SECTION_NODE :
outputTextToWriter(currentNode.getNodeValue(), writer);
break;
case Node.ELEMENT_NODE :
documentLevel = NODE_NOT_BEFORE_OR_AFTER_DOCUMENT_ELEMENT;
if (currentNode == excludeNode) {
break;
}
Element currentElement = (Element)currentNode;
//Add a level to the nssymbtable. So latter can be pop-back.
ns.outputNodePush();
writer.write('<');
String name = currentElement.getTagName();
UtfHelpper.writeByte(name, writer, cache);
outputAttributesSubtree(currentElement, ns, cache);
writer.write('>');
sibling = currentNode.getFirstChild();
if (sibling == null) {
writer.write(END_TAG.clone());
UtfHelpper.writeStringToUtf8(name, writer);
writer.write('>');
//We finished with this level, pop to the previous definitions.
ns.outputNodePop();
if (parentNode != null) {
sibling = currentNode.getNextSibling();
}
} else {
parentNode = currentElement;
}
break;
case Node.DOCUMENT_TYPE_NODE :
default :
break;
}
while (sibling == null && parentNode != null) {
writer.write(END_TAG.clone());
UtfHelpper.writeByte(((Element)parentNode).getTagName(), writer, cache);
writer.write('>');
//We finished with this level, pop to the previous definitions.
ns.outputNodePop();
if (parentNode == endnode) {
return;
}
sibling = parentNode.getNextSibling();
parentNode = parentNode.getParentNode();
if (parentNode == null || Node.ELEMENT_NODE != parentNode.getNodeType()) {
documentLevel = NODE_AFTER_DOCUMENT_ELEMENT;
parentNode = null;
}
}
if (sibling == null) {
return;
}
currentNode = sibling;
sibling = currentNode.getNextSibling();
} while(true);
}
private byte[] engineCanonicalizeXPathNodeSetInternal(Node doc)
throws CanonicalizationException {
try {
this.canonicalizeXPathNodeSet(doc, doc);
this.writer.flush();
if (this.writer instanceof ByteArrayOutputStream) {
byte[] sol = ((ByteArrayOutputStream)this.writer).toByteArray();
if (reset) {
((ByteArrayOutputStream)this.writer).reset();
} else {
this.writer.close();
}
return sol;
} else if (this.writer instanceof UnsyncByteArrayOutputStream) {
byte[] result = ((UnsyncByteArrayOutputStream)this.writer).toByteArray();
if (reset) {
((UnsyncByteArrayOutputStream)this.writer).reset();
} else {
this.writer.close();
}
return result;
} else {
this.writer.close();
}
return null;
} catch (UnsupportedEncodingException ex) {
throw new CanonicalizationException(ex);
} catch (IOException ex) {
throw new CanonicalizationException(ex);
}
}
/**
* Canonicalizes all the nodes included in the currentNode and contained in the
* xpathNodeSet field.
*
* @param currentNode
* @param endnode
* @throws CanonicalizationException
* @throws IOException
*/
protected final void canonicalizeXPathNodeSet(Node currentNode, Node endnode)
throws CanonicalizationException, IOException {
if (isVisibleInt(currentNode) == -1) {
return;
}
boolean currentNodeIsVisible = false;
NameSpaceSymbTable ns = new NameSpaceSymbTable();
if (currentNode != null && Node.ELEMENT_NODE == currentNode.getNodeType()) {
getParentNameSpaces((Element)currentNode, ns);
}
if (currentNode == null) {
return;
}
Node sibling = null;
Node parentNode = null;
int documentLevel = NODE_BEFORE_DOCUMENT_ELEMENT;
Map cache = new HashMap<>();
do {
switch (currentNode.getNodeType()) {
case Node.ENTITY_NODE :
case Node.NOTATION_NODE :
case Node.ATTRIBUTE_NODE :
// illegal node type during traversal
throw new CanonicalizationException("empty",
new Object[]{"illegal node type during traversal"});
case Node.DOCUMENT_FRAGMENT_NODE :
case Node.DOCUMENT_NODE :
ns.outputNodePush();
sibling = currentNode.getFirstChild();
break;
case Node.COMMENT_NODE :
if (this.includeComments && isVisibleDO(currentNode, ns.getLevel()) == 1) {
outputCommentToWriter((Comment) currentNode, writer, documentLevel);
}
break;
case Node.PROCESSING_INSTRUCTION_NODE :
if (isVisible(currentNode)) {
outputPItoWriter((ProcessingInstruction) currentNode, writer, documentLevel);
}
break;
case Node.TEXT_NODE :
case Node.CDATA_SECTION_NODE :
if (isVisible(currentNode)) {
outputTextToWriter(currentNode.getNodeValue(), writer);
for (Node nextSibling = currentNode.getNextSibling();
nextSibling != null && (nextSibling.getNodeType() == Node.TEXT_NODE
|| nextSibling.getNodeType() == Node.CDATA_SECTION_NODE);
nextSibling = nextSibling.getNextSibling()) {
outputTextToWriter(nextSibling.getNodeValue(), writer);
currentNode = nextSibling;
sibling = currentNode.getNextSibling();
}
}
break;
case Node.ELEMENT_NODE :
documentLevel = NODE_NOT_BEFORE_OR_AFTER_DOCUMENT_ELEMENT;
Element currentElement = (Element) currentNode;
//Add a level to the nssymbtable. So latter can be pop-back.
String name = null;
int i = isVisibleDO(currentNode, ns.getLevel());
if (i == -1) {
sibling = currentNode.getNextSibling();
break;
}
currentNodeIsVisible = i == 1;
if (currentNodeIsVisible) {
ns.outputNodePush();
writer.write('<');
name = currentElement.getTagName();
UtfHelpper.writeByte(name, writer, cache);
} else {
ns.push();
}
outputAttributes(currentElement, ns, cache);
if (currentNodeIsVisible) {
writer.write('>');
}
sibling = currentNode.getFirstChild();
if (sibling == null) {
if (currentNodeIsVisible) {
writer.write(END_TAG.clone());
UtfHelpper.writeByte(name, writer, cache);
writer.write('>');
//We finished with this level, pop to the previous definitions.
ns.outputNodePop();
} else {
ns.pop();
}
if (parentNode != null) {
sibling = currentNode.getNextSibling();
}
} else {
parentNode = currentElement;
}
break;
case Node.DOCUMENT_TYPE_NODE :
default :
break;
}
while (sibling == null && parentNode != null) {
if (isVisible(parentNode)) {
writer.write(END_TAG.clone());
UtfHelpper.writeByte(((Element)parentNode).getTagName(), writer, cache);
writer.write('>');
//We finished with this level, pop to the previous definitions.
ns.outputNodePop();
} else {
ns.pop();
}
if (parentNode == endnode) {
return;
}
sibling = parentNode.getNextSibling();
parentNode = parentNode.getParentNode();
if (parentNode == null || Node.ELEMENT_NODE != parentNode.getNodeType()) {
parentNode = null;
documentLevel = NODE_AFTER_DOCUMENT_ELEMENT;
}
}
if (sibling == null) {
return;
}
currentNode = sibling;
sibling = currentNode.getNextSibling();
} while(true);
}
protected int isVisibleDO(Node currentNode, int level) {
if (nodeFilter != null) {
Iterator it = nodeFilter.iterator();
while (it.hasNext()) {
int i = it.next().isNodeIncludeDO(currentNode, level);
if (i != 1) {
return i;
}
}
}
if (this.xpathNodeSet != null && !this.xpathNodeSet.contains(currentNode)) {
return 0;
}
return 1;
}
protected int isVisibleInt(Node currentNode) {
if (nodeFilter != null) {
Iterator it = nodeFilter.iterator();
while (it.hasNext()) {
int i = it.next().isNodeInclude(currentNode);
if (i != 1) {
return i;
}
}
}
if (this.xpathNodeSet != null && !this.xpathNodeSet.contains(currentNode)) {
return 0;
}
return 1;
}
protected boolean isVisible(Node currentNode) {
if (nodeFilter != null) {
Iterator it = nodeFilter.iterator();
while (it.hasNext()) {
if (it.next().isNodeInclude(currentNode) != 1) {
return false;
}
}
}
if (this.xpathNodeSet != null && !this.xpathNodeSet.contains(currentNode)) {
return false;
}
return true;
}
protected void handleParent(Element e, NameSpaceSymbTable ns) {
if (!e.hasAttributes() && e.getNamespaceURI() == null) {
return;
}
NamedNodeMap attrs = e.getAttributes();
int attrsLength = attrs.getLength();
for (int i = 0; i < attrsLength; i++) {
Attr attribute = (Attr) attrs.item(i);
String NName = attribute.getLocalName();
String NValue = attribute.getNodeValue();
if (Constants.NamespaceSpecNS.equals(attribute.getNamespaceURI())
&& (!XML.equals(NName) || !Constants.XML_LANG_SPACE_SpecNS.equals(NValue))) {
ns.addMapping(NName, NValue, attribute);
}
}
if (e.getNamespaceURI() != null) {
String NName = e.getPrefix();
String NValue = e.getNamespaceURI();
String Name;
if (NName == null || NName.equals("")) {
NName = XMLNS;
Name = XMLNS;
} else {
Name = XMLNS + ":" + NName;
}
Attr n = e.getOwnerDocument().createAttributeNS("http://www.w3.org/2000/xmlns/", Name);
n.setValue(NValue);
ns.addMapping(NName, NValue, n);
}
}
/**
* Adds to ns the definitions from the parent elements of el
* @param el
* @param ns
*/
protected final void getParentNameSpaces(Element el, NameSpaceSymbTable ns) {
Node n1 = el.getParentNode();
if (n1 == null || Node.ELEMENT_NODE != n1.getNodeType()) {
return;
}
//Obtain all the parents of the element
List parents = new ArrayList<>();
Node parent = n1;
while (parent != null && Node.ELEMENT_NODE == parent.getNodeType()) {
parents.add((Element)parent);
parent = parent.getParentNode();
}
//Visit them in reverse order.
ListIterator it = parents.listIterator(parents.size());
while (it.hasPrevious()) {
Element ele = it.previous();
handleParent(ele, ns);
}
parents.clear();
Attr nsprefix = ns.getMappingWithoutRendered(XMLNS);
if (nsprefix != null && "".equals(nsprefix.getValue())) {
ns.addMappingAndRender(
XMLNS, "", getNullNode(nsprefix.getOwnerDocument()));
}
}
/**
* Output the attributes for this node in XPathNodeSet c14n.
*
* @param element
* @param ns
* @param cache
* @throws CanonicalizationException, DOMException, IOException
*/
abstract void outputAttributes(Element element, NameSpaceSymbTable ns, Map cache)
throws CanonicalizationException, DOMException, IOException;
/**
* Output the attributes for this node in a Subtree c14n.
*
* @param element
* @param ns
* @param cache
* @throws CanonicalizationException, DOMException, IOException
*/
abstract void outputAttributesSubtree(Element element, NameSpaceSymbTable ns, Map cache)
throws CanonicalizationException, DOMException, IOException;
abstract void circumventBugIfNeeded(XMLSignatureInput input)
throws CanonicalizationException, ParserConfigurationException, IOException, SAXException;
/**
* Outputs an Attribute to the internal Writer.
*
* The string value of the node is modified by replacing
*
*
all ampersands with &
*
all open angle brackets with <
*
all quotation mark characters with "
*
and the whitespace characters #x9, #xA, and #xD, with character
* references. The character references are written in uppercase
* hexadecimal with no leading zeroes (for example, #xD is represented
* by the character reference 
)
*
*
* @param name
* @param value
* @param writer
* @throws IOException
*/
protected static final void outputAttrToWriter(
final String name, final String value,
final OutputStream writer, final Map cache
) throws IOException {
writer.write(' ');
UtfHelpper.writeByte(name, writer, cache);
writer.write(EQUALS_STR.clone());
byte[] toWrite;
final int length = value.length();
int i = 0;
while (i < length) {
int c = value.codePointAt(i);
i += Character.charCount(c);
switch (c) {
case '&' :
toWrite = AMP.clone();
break;
case '<' :
toWrite = LT.clone();
break;
case '"' :
toWrite = QUOT.clone();
break;
case 0x09 : // '\t'
toWrite = X9.clone();
break;
case 0x0A : // '\n'
toWrite = XA.clone();
break;
case 0x0D : // '\r'
toWrite = XD.clone();
break;
default :
if (c < 0x80) {
writer.write(c);
} else {
UtfHelpper.writeCodePointToUtf8(c, writer);
}
continue;
}
writer.write(toWrite);
}
writer.write('\"');
}
/**
* Outputs a PI to the internal Writer.
*
* @param currentPI
* @param writer where to write the things
* @throws IOException
*/
protected void outputPItoWriter(
ProcessingInstruction currentPI, OutputStream writer, int position
) throws IOException {
if (position == NODE_AFTER_DOCUMENT_ELEMENT) {
writer.write('\n');
}
writer.write(BEGIN_PI.clone());
final String target = currentPI.getTarget();
int length = target.length();
for (int i = 0; i < length; ) {
int c = target.codePointAt(i);
i += Character.charCount(c);
if (c == 0x0D) {
writer.write(XD.clone());
} else {
if (c < 0x80) {
writer.write(c);
} else {
UtfHelpper.writeCodePointToUtf8(c, writer);
}
}
}
final String data = currentPI.getData();
length = data.length();
if (length > 0) {
writer.write(' ');
for (int i = 0; i < length; ) {
int c = data.codePointAt(i);
i += Character.charCount(c);
if (c == 0x0D) {
writer.write(XD.clone());
} else {
UtfHelpper.writeCodePointToUtf8(c, writer);
}
}
}
writer.write(END_PI.clone());
if (position == NODE_BEFORE_DOCUMENT_ELEMENT) {
writer.write('\n');
}
}
/**
* Method outputCommentToWriter
*
* @param currentComment
* @param writer writer where to write the things
* @throws IOException
*/
protected void outputCommentToWriter(
Comment currentComment, OutputStream writer, int position
) throws IOException {
if (position == NODE_AFTER_DOCUMENT_ELEMENT) {
writer.write('\n');
}
writer.write(BEGIN_COMM.clone());
final String data = currentComment.getData();
final int length = data.length();
for (int i = 0; i < length; ) {
int c = data.codePointAt(i);
i += Character.charCount(c);
if (c == 0x0D) {
writer.write(XD.clone());
} else {
if (c < 0x80) {
writer.write(c);
} else {
UtfHelpper.writeCodePointToUtf8(c, writer);
}
}
}
writer.write(END_COMM.clone());
if (position == NODE_BEFORE_DOCUMENT_ELEMENT) {
writer.write('\n');
}
}
/**
* Outputs a Text of CDATA section to the internal Writer.
*
* @param text
* @param writer writer where to write the things
* @throws IOException
*/
protected static final void outputTextToWriter(
final String text, final OutputStream writer
) throws IOException {
final int length = text.length();
byte[] toWrite;
for (int i = 0; i < length; ) {
int c = text.codePointAt(i);
i += Character.charCount(c);
switch (c) {
case '&' :
toWrite = AMP.clone();
break;
case '<' :
toWrite = LT.clone();
break;
case '>' :
toWrite = GT.clone();
break;
case 0xD :
toWrite = XD.clone();
break;
default :
if (c < 0x80) {
writer.write(c);
} else {
UtfHelpper.writeCodePointToUtf8(c, writer);
}
continue;
}
writer.write(toWrite);
}
}
// The null xmlns definition.
protected Attr getNullNode(Document ownerDocument) {
if (nullNode == null) {
try {
nullNode = ownerDocument.createAttributeNS(
Constants.NamespaceSpecNS, XMLNS);
nullNode.setValue("");
} catch (Exception e) {
throw new RuntimeException("Unable to create nullNode: " + e);
}
}
return nullNode;
}
}
