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*/
/*
* Copyright 1999-2004 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.
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package com.sun.org.apache.xml.internal.security.transforms.implementations;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import com.sun.org.apache.xml.internal.security.c14n.CanonicalizationException;
import com.sun.org.apache.xml.internal.security.c14n.InvalidCanonicalizerException;
import com.sun.org.apache.xml.internal.security.exceptions.XMLSecurityException;
import com.sun.org.apache.xml.internal.security.signature.NodeFilter;
import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;
import com.sun.org.apache.xml.internal.security.transforms.TransformSpi;
import com.sun.org.apache.xml.internal.security.transforms.TransformationException;
import com.sun.org.apache.xml.internal.security.transforms.Transforms;
import com.sun.org.apache.xml.internal.security.transforms.params.XPath2FilterContainer;
import com.sun.org.apache.xml.internal.security.utils.CachedXPathAPIHolder;
import com.sun.org.apache.xml.internal.security.utils.CachedXPathFuncHereAPI;
import com.sun.org.apache.xml.internal.security.utils.XMLUtils;
import org.w3c.dom.DOMException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
/**
* Implements the <I>XML Signature XPath Filter v2.0</I>
*
* @author $Author: mullan $
* @see <A HREF="http://www.w3.org/TR/xmldsig-filter2/">XPath Filter v2.0 (TR)</A>
* @see <a HREF="http://www.w3.org/Signature/Drafts/xmldsig-xfilter2/">XPath Filter v2.0 (editors copy)</a>
*/
public class TransformXPath2Filter extends TransformSpi {
/** {@link java.util.logging} logging facility */
// static java.util.logging.Logger log =
// java.util.logging.Logger.getLogger(
// TransformXPath2Filter.class.getName());
/** Field implementedTransformURI */
public static final String implementedTransformURI =
Transforms.TRANSFORM_XPATH2FILTER;
//J-
// contains the type of the filter
// contains the node set
/**
* Method engineGetURI
*
* @inheritDoc
*/
protected String engineGetURI() {
return implementedTransformURI;
}
/**
* Method enginePerformTransform
* @inheritDoc
* @param input
*
* @throws TransformationException
*/
protected XMLSignatureInput enginePerformTransform(XMLSignatureInput input)
throws TransformationException {
CachedXPathAPIHolder.setDoc(this._transformObject.getElement().getOwnerDocument());
try {
List unionNodes=new ArrayList();
List substractNodes=new ArrayList();
List intersectNodes=new ArrayList();
CachedXPathFuncHereAPI xPathFuncHereAPI =
new CachedXPathFuncHereAPI(CachedXPathAPIHolder.getCachedXPathAPI());
Element []xpathElements =XMLUtils.selectNodes(
this._transformObject.getElement().getFirstChild(),
XPath2FilterContainer.XPathFilter2NS,
XPath2FilterContainer._TAG_XPATH2);
int noOfSteps = xpathElements.length;
if (noOfSteps == 0) {
Object exArgs[] = { Transforms.TRANSFORM_XPATH2FILTER, "XPath" };
throw new TransformationException("xml.WrongContent", exArgs);
}
Document inputDoc = null;
if (input.getSubNode() != null) {
inputDoc = XMLUtils.getOwnerDocument(input.getSubNode());
} else {
inputDoc = XMLUtils.getOwnerDocument(input.getNodeSet());
}
for (int i = 0; i < noOfSteps; i++) {
Element xpathElement =XMLUtils.selectNode(
this._transformObject.getElement().getFirstChild(),
XPath2FilterContainer.XPathFilter2NS,
XPath2FilterContainer._TAG_XPATH2,i);
XPath2FilterContainer xpathContainer =
XPath2FilterContainer.newInstance(xpathElement,
input.getSourceURI());
NodeList subtreeRoots = xPathFuncHereAPI.selectNodeList(inputDoc,
xpathContainer.getXPathFilterTextNode(),
CachedXPathFuncHereAPI.getStrFromNode(xpathContainer.getXPathFilterTextNode()),
xpathContainer.getElement());
if (xpathContainer.isIntersect()) {
intersectNodes.add(subtreeRoots);
} else if (xpathContainer.isSubtract()) {
substractNodes.add(subtreeRoots);
} else if (xpathContainer.isUnion()) {
unionNodes.add(subtreeRoots);
}
}
input.setNeedsToBeExpanded(true);
input.addNodeFilter(new XPath2NodeFilter(unionNodes,substractNodes,intersectNodes));
input.setNodeSet(true);
return input;
} catch (TransformerException ex) {
throw new TransformationException("empty", ex);
} catch (DOMException ex) {
throw new TransformationException("empty", ex);
} catch (CanonicalizationException ex) {
throw new TransformationException("empty", ex);
} catch (InvalidCanonicalizerException ex) {
throw new TransformationException("empty", ex);
} catch (XMLSecurityException ex) {
throw new TransformationException("empty", ex);
} catch (SAXException ex) {
throw new TransformationException("empty", ex);
} catch (IOException ex) {
throw new TransformationException("empty", ex);
} catch (ParserConfigurationException ex) {
throw new TransformationException("empty", ex);
}
}
}
class XPath2NodeFilter implements NodeFilter {
XPath2NodeFilter(List unionNodes, List substractNodes,
List intersectNodes) {
this.unionNodes=unionNodes;
this.substractNodes=substractNodes;
this.intersectNodes=intersectNodes;
}
List unionNodes=new ArrayList();
List substractNodes=new ArrayList();
List intersectNodes=new ArrayList();
/**
* @see com.sun.org.apache.xml.internal.security.signature.NodeFilter#isNodeInclude(org.w3c.dom.Node)
*/
public boolean isNodeInclude(Node currentNode) {
boolean notIncluded=false;
if (rooted(currentNode,substractNodes)) {
notIncluded=true;
} else if (!rooted(currentNode,intersectNodes)) {
notIncluded=true;
}
if (notIncluded && rooted(currentNode,unionNodes)) {
notIncluded=false;
}
return !notIncluded;
}
/**
* Method rooted
* @param currentNode
* @param nodeList
*
* @return if rooted bye the rootnodes
*/
boolean rooted(Node currentNode, List nodeList ) {
for (int j=0;j<nodeList.size();j++) {
NodeList rootNodes=(NodeList) nodeList.get(j);
int length = rootNodes.getLength();
for (int i = 0; i < length; i++) {
Node rootNode = rootNodes.item(i);
if (XMLUtils.isDescendantOrSelf(rootNode,currentNode)) {
return true;
}
}
}
return false;
}
}