resourcejavamethoddispatcher.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 115 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
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 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.jersey.impl.model.method.dispatch;

import com.sun.jersey.api.container.ContainerCheckedException;
import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.api.core.HttpContext;
import com.sun.jersey.api.core.HttpRequestContext;
import com.sun.jersey.api.model.AbstractResourceMethod;
import com.sun.jersey.spi.dispatch.RequestDispatcher;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import javax.ws.rs.core.MediaType;

/**
 *
 * @author [e-mail]
 */
public abstract class ResourceJavaMethodDispatcher implements RequestDispatcher {

    protected final Method method;
    
    final private List<MediaType> produceMime;
    
    final private MediaType mediaType;

    public ResourceJavaMethodDispatcher(AbstractResourceMethod abstractResourceMethod) {
        this.method = abstractResourceMethod.getMethod();
        this.produceMime = abstractResourceMethod.getSupportedOutputTypes();
        
        if (this.produceMime.size() == 1) {
            MediaType c = this.produceMime.get(0);
            if (c.getType().equals("*") || c.getSubtype().equals("*")) 
                mediaType = null;
            else
                mediaType = c;
        } else {
            mediaType = null;
        }        
    }    
    
    public final void dispatch(Object resource, HttpContext context) {
        // Invoke the method on the resource
        try {
            _dispatch(resource, context);
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();
            if (t instanceof RuntimeException) {
                // Propagate runtime exception
                throw (RuntimeException)t;
            } else if (t instanceof Exception) {
                // Propagate checked exception wrapping around runtime exception
                throw new ContainerCheckedException((Exception)t);
            } else
                throw new ContainerException(t);
        } catch (IllegalAccessException e) {
            throw new ContainerException(e);
        }
    }
    
    protected final MediaType getAcceptableMediaType(HttpRequestContext requestContext) {
        if (produceMime.size() == 1) {
            return mediaType;
        } else {
            MediaType m = requestContext.getAcceptableMediaType(produceMime);
            if (m != null) {
                if (m.getType().equals(MediaType.MEDIA_TYPE_WILDCARD) ||
                        m.getSubtype().equals(MediaType.MEDIA_TYPE_WILDCARD))
                    return null;
            }

            return m;
        }
    }
    
    protected abstract void _dispatch(Object resource, HttpContext context)
            throws IllegalAccessException, InvocationTargetException;
}