/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 2005 The Apache Software Foundation.
*
* Licensed 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.
*
*/
/*
* Copyright (c) 2005, 2008, Oracle and/or its affiliates. All rights reserved.
*/
/*
* $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
*/
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);
}
}