| /* |
| * 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.camel.language.xpath; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| import org.w3c.dom.Text; |
| |
| import org.apache.camel.support.builder.xml.XMLConverterHelper; |
| |
| /** |
| * A simple thread-safe {@link NodeList} that is used by XPathBuilder |
| * to return thread-safe {@link NodeList} instances as its result. |
| * <p/> |
| * This is needed to ensure that end users do not hit any concurrency issues while working |
| * with xpath expressions using built-in from the JDK or via camel-saxon. |
| */ |
| class ThreadSafeNodeList implements NodeList { |
| |
| private final List<Node> list = new ArrayList<>(); |
| |
| public ThreadSafeNodeList(NodeList source) throws Exception { |
| init(source); |
| } |
| |
| @Override |
| public Node item(int index) { |
| return list.get(index); |
| } |
| |
| @Override |
| public int getLength() { |
| return list.size(); |
| } |
| |
| private void init(NodeList source) throws Exception { |
| for (int i = 0; i < source.getLength(); i++) { |
| Node node = source.item(i); |
| if (node != null) { |
| // import node must not occur concurrent on the same node (must be its owner) |
| // so we need to synchronize on it |
| synchronized (node.getOwnerDocument()) { |
| Document doc = new XMLConverterHelper().createDocument(); |
| // import node must not occur concurrent on the same node (must be its owner) |
| // so we need to synchronize on it |
| synchronized (node.getOwnerDocument()) { |
| Node clone = doc.importNode(node, true); |
| if (clone instanceof Text) { |
| // basic text node then add as-is |
| list.add(clone); |
| } else { |
| // more complex node, then add as child (yes its a bit weird but this is working) |
| doc.appendChild(clone); |
| list.add(doc.getChildNodes().item(0)); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| } |