/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* $Id: DOMXPathTransform.java,v 1.16 2005/05/12 19:28:35 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);
}
}