net.javacrumbs.springws.test.lookup.ExpressionBasedResourceLookup.java Source code

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Here is the source code for net.javacrumbs.springws.test.lookup.ExpressionBasedResourceLookup.java

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/**
 * 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.lookup;

import java.io.IOException;
import java.net.URI;

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

import org.springframework.core.io.Resource;
import org.springframework.ws.WebServiceMessage;
import org.w3c.dom.Document;

/**
 * Loads resources based on expressions and message content. Iterates over
 * expressions, evaluates them and looks for resources with given name. If resource is found, it is returned, if
 * it is not found another expression is applied. If no result is found, <code>null</code> is
 * returned.
 * XPathResourceLookup
 * <br/> 
 * 
 * Following variables can be used:
 * <ul>
 * <li><code>$uri</code> for service URI.</li>
 * <li><Context attributes like <code>$context.departureTime</code></li>
 * <li>Expressions like <code>$uri.host</code>
 * </ul>
 * 
 * @author Lukas Krecan
 * 
 */
public class ExpressionBasedResourceLookup extends AbstractResourceLookup {
    private String[] resourceExpressions;

    /**
     * Iterates over expressions, evaluates them and looks for resource with corresponding name. 
     */
    public Resource lookupResource(URI uri, WebServiceMessage message) throws IOException {
        if (resourceExpressions != null) {
            Document document = loadDocument(message);
            for (String resourceExpression : resourceExpressions) {
                try {
                    Resource resultResource = findResourceForExpression(resourceExpression, uri, document);
                    if (resultResource != null) {
                        logger.debug("Found resource " + resultResource);
                        return processResource(uri, message, resultResource);
                    }
                } catch (ExpressionResolverException e) {
                    logger.warn("Resolution of expression \"" + resourceExpression + "\" failed.", e);
                }
            }
        }
        return null;
    }

    /**
     * Looks for a resource using given expression.
     * @param xpath
     * @param uri
     * @param document
     * @return
     */
    protected Resource findResourceForExpression(String xpath, URI uri, Document document) {
        String resourcePath = evaluateExpression(xpath, uri, document);
        logger.debug("Looking for resource \"" + resourcePath + "\"");
        Resource resultResource = getResourceLoader().getResource(resourcePath);
        resultResource = resultResource.exists() ? resultResource : null;
        return resultResource;
    }

    public String[] getResourceExpressions() {
        return resourceExpressions;
    }

    public void setResourceExpressions(String... resourceExpressions) {
        this.resourceExpressions = resourceExpressions;
    }
}