net.javacrumbs.springws.test.common.XPathExpressionEvaluator.java Source code

Introduction

Here is the source code for net.javacrumbs.springws.test.common.XPathExpressionEvaluator.java

Source

/**
 * Copyright 2009-2010 the original author or authors.
 *
 * Licensed 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 net.javacrumbs.springws.test.common;

import java.net.URI;

import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import net.javacrumbs.springws.test.expression.ExpressionResolverException;
import net.javacrumbs.springws.test.expression.WsTestXPathVariableResolver;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Document;

public class XPathExpressionEvaluator implements ExpressionEvaluator {

    private final Log logger = LogFactory.getLog(getClass());

    public String evaluateExpression(Document document, String expression, URI uri,
            NamespaceContext namespaceContext) {
        XPathFactory factory = XPathFactory.newInstance();
        factory.setXPathVariableResolver(new WsTestXPathVariableResolver(uri));
        try {
            XPath xpath = factory.newXPath();
            if (namespaceContext != null) {
                xpath.setNamespaceContext(namespaceContext);
            }
            String result = xpath.evaluate(expression, document);
            logger.debug("Expression \"" + expression + "\" resolved to \"" + result + "\"");
            return result;
        } catch (XPathExpressionException e) {
            throw new ExpressionResolverException(
                    "Could not evaluate XPath expression \"" + expression + "\" : \"" + e.getMessage() + "\"", e);
        }
    }

}