jsonjaxbelementprovider.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 132 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]"
 * 
 * Contributor(s):
 * 
 * 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.provider.entity;

import com.sun.jersey.impl.ImplMessages;
import com.sun.jersey.api.json.JSONJAXBContext;
import com.sun.jersey.impl.json.JSONMarshaller;
import com.sun.jersey.impl.json.JSONUnmarshaller;
import com.sun.jersey.impl.json.reader.JsonXmlStreamReader;
import com.sun.jersey.impl.json.writer.JsonXmlStreamWriter;
import com.sun.jersey.impl.util.ThrowHelper;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import javax.ws.rs.ConsumeMime;
import javax.ws.rs.ProduceMime;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.transform.stream.StreamSource;

/**
 *
 * @author japod
 */
@ProduceMime("application/json")
@ConsumeMime("application/json")
public final class JSONJAXBElementProvider extends AbstractJAXBElementProvider {
    
    public JSONJAXBElementProvider() {
        Class<?> c = JAXBContext.class;
    }
    
    @SuppressWarnings("unchecked")
    public JAXBElement<?> readFrom(
            Class<JAXBElement<?>> type, 
            Type genericType, 
            Annotation annotations[],
            MediaType mediaType, 
            MultivaluedMap<String, String> httpHeaders, 
            InputStream entityStream) throws IOException {
        ParameterizedType pt = (ParameterizedType)genericType;
        Class ta = (Class)pt.getActualTypeArguments()[0];
        
        try {
            StreamSource source = new StreamSource(entityStream);
            JAXBContext context = getJAXBContext(ta);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            if (unmarshaller instanceof JSONUnmarshaller) {
                unmarshaller.setProperty(JSONJAXBContext.JSON_ENABLED, Boolean.TRUE);
                return unmarshaller.unmarshal(source, ta);
            } else {
                return (JAXBElement) unmarshaller.unmarshal(new JsonXmlStreamReader(
                        new InputStreamReader(entityStream, getCharset(mediaType)), true), ta);
            }
        } catch (JAXBException cause) {
            throw ThrowHelper.withInitCause(cause,
                    new IOException(ImplMessages.ERROR_MARSHALLING_JAXB(type))
                    );
        }    
    }
    
    public void writeTo(
            JAXBElement<?> t, 
            Class<?> type, 
            Type genericType, 
            Annotation annotations[], 
            MediaType mediaType, 
            MultivaluedMap<String, Object> httpHeaders,
            OutputStream entityStream) throws IOException {
        try {
            JAXBContext context = getJAXBContext(t.getDeclaredType());            
            Marshaller marshaller = context.createMarshaller();
            if (marshaller instanceof JSONMarshaller) {
                marshaller.setProperty(JSONJAXBContext.JSON_ENABLED, Boolean.TRUE);
                marshaller.marshal(t, 
                        new OutputStreamWriter(entityStream, getCharset(mediaType, UTF8)));
            } else {
                marshaller.marshal(t, new JsonXmlStreamWriter(
                        new OutputStreamWriter(entityStream, getCharset(mediaType, UTF8)), true));
            }
        } catch (JAXBException cause) {
            throw ThrowHelper.withInitCause(cause,
                    new IOException(ImplMessages.ERROR_MARSHALLING_JAXB(t.getClass()))
                    );
        }
    }
}