| /* |
| * 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 flex.messaging.config; |
| |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| import javax.xml.xpath.XPath; |
| import javax.xml.xpath.XPathConstants; |
| import javax.xml.xpath.XPathExpressionException; |
| import javax.xml.xpath.XPathFactory; |
| |
| /** |
| * Uses Sun's JDK 1.5 XPath implementation on a DOM |
| * representation of a messaging configuration file. |
| * <p> |
| * NOTE: Since reference ids are used between elements, certain |
| * sections of the document need to be parsed first. |
| * </p> |
| * |
| * |
| */ |
| public class XPathClientConfigurationParser extends ClientConfigurationParser |
| { |
| private XPath xpath; |
| |
| protected void initializeExpressionQuery() |
| { |
| this.xpath = XPathFactory.newInstance().newXPath(); |
| } |
| |
| protected Node selectSingleNode(Node source, String expression) |
| { |
| try |
| { |
| return (Node) xpath.evaluate(expression, source, XPathConstants.NODE); |
| } |
| catch (XPathExpressionException expressionException) |
| { |
| throw wrapException(expressionException); |
| } |
| } |
| |
| protected NodeList selectNodeList(Node source, String expression) |
| { |
| try |
| { |
| return (NodeList) xpath.evaluate(expression, source, XPathConstants.NODESET); |
| } |
| catch (XPathExpressionException expressionException) |
| { |
| throw wrapException(expressionException); |
| } |
| } |
| |
| protected Object evaluateExpression(Node source, String expression) |
| { |
| try |
| { |
| return xpath.evaluate(expression, source, XPathConstants.STRING); |
| } |
| catch (XPathExpressionException expressionException) |
| { |
| throw wrapException(expressionException); |
| } |
| } |
| |
| private ConfigurationException wrapException(XPathExpressionException exception) |
| { |
| ConfigurationException result = new ConfigurationException(); |
| result.setDetails(PARSER_INTERNAL_ERROR); |
| result.setRootCause(exception); |
| return result; |
| } |
| } |