/*
* 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.activemq.artemis.selector.filter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.StringReader;
import org.apache.xpath.CachedXPathAPI;
import org.apache.xpath.objects.XObject;
import org.w3c.dom.Document;
import org.w3c.dom.traversal.NodeIterator;
import org.xml.sax.InputSource;
public class XalanXPathEvaluator implements XPathExpression.XPathEvaluator {
private final String xpath;
public XalanXPathEvaluator(String xpath) {
this.xpath = xpath;
}
@Override
public boolean evaluate(Filterable m) throws FilterException {
String stringBody = m.getBodyAs(String.class);
if (stringBody != null) {
return evaluate(stringBody);
}
return false;
}
protected boolean evaluate(String text) {
return evaluate(new InputSource(new StringReader(text)));
}
protected boolean evaluate(InputSource inputSource) {
try {
DocumentBuilder dbuilder = createDocumentBuilder();
Document doc = dbuilder.parse(inputSource);
//An XPath expression could return a true or false value instead of a node.
//eval() is a better way to determine the boolean value of the exp.
//For compliance with legacy behavior where selecting an empty node returns true,
//selectNodeIterator is attempted in case of a failure.
CachedXPathAPI cachedXPathAPI = new CachedXPathAPI();
XObject result = cachedXPathAPI.eval(doc, xpath);
if (result.bool())
return true;
else {
NodeIterator iterator = cachedXPathAPI.selectNodeIterator(doc, xpath);
return (iterator.nextNode() != null);
}
} catch (Throwable e) {
return false;
}
}
private DocumentBuilder createDocumentBuilder() throws ParserConfigurationException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware(true);
factory.setFeature("http://xml.org/sax/features/external-general-entities", false);
factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
return factory.newDocumentBuilder();
}
}