flex.messaging.config.XPathServerConfigurationParser Maven / Gradle / Ivy
/*
* 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.
*
* Note: Since reference ids are used between elements, certain
* sections of the document need to be parsed first.
*
*
*
*/
public class XPathServerConfigurationParser extends ServerConfigurationParser
{
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;
}
}