diff options
Diffstat (limited to 'qpid/java/broker/src/main/java/org/apache/qpid/server/filter/XalanXPathEvaluator.java')
-rw-r--r-- | qpid/java/broker/src/main/java/org/apache/qpid/server/filter/XalanXPathEvaluator.java | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/qpid/java/broker/src/main/java/org/apache/qpid/server/filter/XalanXPathEvaluator.java b/qpid/java/broker/src/main/java/org/apache/qpid/server/filter/XalanXPathEvaluator.java new file mode 100644 index 0000000000..f83eb63ac5 --- /dev/null +++ b/qpid/java/broker/src/main/java/org/apache/qpid/server/filter/XalanXPathEvaluator.java @@ -0,0 +1,101 @@ +/** + * + * 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.qpid.server.filter; +// +// Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html> +// + +import java.io.ByteArrayInputStream; +import java.io.StringReader; + +import javax.xml.parsers.DocumentBuilder; +import javax.xml.parsers.DocumentBuilderFactory; + +import org.apache.qpid.server.queue.Filterable; +import org.apache.xpath.CachedXPathAPI; +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; + } + + public boolean evaluate(Filterable m) + { + // TODO - we would have to check the content type and then evaluate the content + // here... is this really a feature we wish to implement? - RobG + /* + + if( m instanceof TextMessage ) { + String text = ((TextMessage)m).getText(); + return evaluate(text); + } else if ( m instanceof BytesMessage ) { + BytesMessage bm = (BytesMessage) m; + byte data[] = new byte[(int) bm.getBodyLength()]; + bm.readBytes(data); + return evaluate(data); + } + */ + return false; + + } + + private boolean evaluate(byte[] data) { + try { + + InputSource inputSource = new InputSource(new ByteArrayInputStream(data)); + + DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); + factory.setNamespaceAware(true); + DocumentBuilder dbuilder = factory.newDocumentBuilder(); + Document doc = dbuilder.parse(inputSource); + + CachedXPathAPI cachedXPathAPI = new CachedXPathAPI(); + NodeIterator iterator = cachedXPathAPI.selectNodeIterator(doc,xpath); + return iterator.nextNode()!=null; + + } catch (Throwable e) { + return false; + } + } + + private boolean evaluate(String text) { + try { + InputSource inputSource = new InputSource(new StringReader(text)); + + DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); + factory.setNamespaceAware(true); + DocumentBuilder dbuilder = factory.newDocumentBuilder(); + Document doc = dbuilder.parse(inputSource); + + // We should associated the cachedXPathAPI object with the message being evaluated + // since that should speedup subsequent xpath expressions. + CachedXPathAPI cachedXPathAPI = new CachedXPathAPI(); + NodeIterator iterator = cachedXPathAPI.selectNodeIterator(doc,xpath); + return iterator.nextNode()!=null; + } catch (Throwable e) { + return false; + } + } +} |