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/*
 * Copyright 2005 The Apache Software Foundation.
 *
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 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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/*
 * Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
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/*
 * $Id: DOMXPathTransform.java,v 1.2 2008/07/24 15:20:32 mullan Exp $
 */
package org.jcp.xml.dsig.internal.dom;

import javax.xml.crypto.*;
import javax.xml.crypto.dsig.*;
import javax.xml.crypto.dsig.spec.TransformParameterSpec;
import javax.xml.crypto.dsig.spec.XPathFilterParameterSpec;
import java.security.InvalidAlgorithmParameterException;
import java.util.Iterator;
import java.util.Map;
import java.util.HashMap;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;

DOM-based implementation of XPath Filtering Transform. (Uses Apache XML-Sec Transform implementation)
Author:Sean Mullan
/** * DOM-based implementation of XPath Filtering Transform. * (Uses Apache XML-Sec Transform implementation) * * @author Sean Mullan */
public final class DOMXPathTransform extends ApacheTransform { public void init(TransformParameterSpec params) throws InvalidAlgorithmParameterException { if (params == null) { throw new InvalidAlgorithmParameterException("params are required"); } else if (!(params instanceof XPathFilterParameterSpec)) { throw new InvalidAlgorithmParameterException ("params must be of type XPathFilterParameterSpec"); } this.params = params; } public void init(XMLStructure parent, XMLCryptoContext context) throws InvalidAlgorithmParameterException { super.init(parent, context); unmarshalParams(DOMUtils.getFirstChildElement(transformElem)); } private void unmarshalParams(Element paramsElem) { String xPath = paramsElem.getFirstChild().getNodeValue(); // create a Map of namespace prefixes NamedNodeMap attributes = paramsElem.getAttributes(); if (attributes != null) { int length = attributes.getLength(); Map namespaceMap = new HashMap(length); for (int i = 0; i < length; i++) { Attr attr = (Attr) attributes.item(i); String prefix = attr.getPrefix(); if (prefix != null && prefix.equals("xmlns")) { namespaceMap.put(attr.getLocalName(), attr.getValue()); } } this.params = new XPathFilterParameterSpec(xPath, namespaceMap); } else { this.params = new XPathFilterParameterSpec(xPath); } } public void marshalParams(XMLStructure parent, XMLCryptoContext context) throws MarshalException { super.marshalParams(parent, context); XPathFilterParameterSpec xp = (XPathFilterParameterSpec) getParameterSpec(); Element xpathElem = DOMUtils.createElement (ownerDoc, "XPath", XMLSignature.XMLNS, DOMUtils.getSignaturePrefix(context)); xpathElem.appendChild(ownerDoc.createTextNode(xp.getXPath())); // add namespace attributes, if necessary Iterator i = xp.getNamespaceMap().entrySet().iterator(); while (i.hasNext()) { Map.Entry entry = (Map.Entry) i.next(); xpathElem.setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:" + (String) entry.getKey(), (String) entry.getValue()); } transformElem.appendChild(xpathElem); } }