cn.quickj.test.mock.MockRequestDispatcher.java Source code

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Here is the source code for cn.quickj.test.mock.MockRequestDispatcher.java

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/*
 * Copyright 2002-2010 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 cn.quickj.test.mock;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import cn.quickj.utils.Assert;

/**
 * Mock implementation of the {@link javax.servlet.RequestDispatcher} interface.
 *
 * <p>Used for testing the web framework; typically not necessary for
 * testing application controllers.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 1.0.2
 */
public class MockRequestDispatcher implements RequestDispatcher {

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

    private final String url;

    /**
     * Create a new MockRequestDispatcher for the given URL.
     * @param url the URL to dispatch to.
     */
    public MockRequestDispatcher(String url) {
        Assert.notNull(url, "URL must not be null");
        this.url = url;
    }

    public void forward(ServletRequest request, ServletResponse response) {
        Assert.notNull(request, "Request must not be null");
        Assert.notNull(response, "Response must not be null");
        if (response.isCommitted()) {
            throw new IllegalStateException("Cannot perform forward - response is already committed");
        }
        getMockHttpServletResponse(response).setForwardedUrl(this.url);
        if (logger.isDebugEnabled()) {
            logger.debug("MockRequestDispatcher: forwarding to URL [" + this.url + "]");
        }
    }

    public void include(ServletRequest request, ServletResponse response) {
        Assert.notNull(request, "Request must not be null");
        Assert.notNull(response, "Response must not be null");
        getMockHttpServletResponse(response).addIncludedUrl(this.url);
        if (logger.isDebugEnabled()) {
            logger.debug("MockRequestDispatcher: including URL [" + this.url + "]");
        }
    }

    /**
     * Obtain the underlying MockHttpServletResponse,
     * unwrapping {@link HttpServletResponseWrapper} decorators if necessary.
     */
    protected MockHttpServletResponse getMockHttpServletResponse(ServletResponse response) {
        if (response instanceof MockHttpServletResponse) {
            return (MockHttpServletResponse) response;
        }
        if (response instanceof HttpServletResponseWrapper) {
            return getMockHttpServletResponse(((HttpServletResponseWrapper) response).getResponse());
        }
        throw new IllegalArgumentException("MockRequestDispatcher requires MockHttpServletResponse");
    }

}