Creating a branch for experimenting with some ideas for JMS client.rajith_jms_client

git-svn-id: https://svn.apache.org/repos/asf/qpid/branches/rajith_jms_client@1128369 13f79535-47bb-0310-9956-ffa450edef68

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;
+        }
+    }
+}