abstractmessagereaderwriterprovider.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]"
 * 
 * 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 java.io.BufferedWriter;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.charset.Charset;
import javax.ws.rs.core.MediaType;

/**
 *
 * @author [e-mail]
 */
public abstract class AbstractMessageReaderWriterProvider<T> implements 
        MessageBodyReader<T>, MessageBodyWriter<T> {

    public static final Charset UTF8 = Charset.forName("UTF-8");
                  
    public static final Charset getCharset(MediaType m) {
        String name = (m == null) ? null : m.getParameters().get("charset");
        return (name == null) ? UTF8 : Charset.forName(name);
    }
        
    public static final Charset getCharset(MediaType m, Charset def) {
        String name = (m == null) ? null : m.getParameters().get("charset");
        try {
            return (name == null) ? UTF8 : Charset.forName(name);
        } catch (RuntimeException e) {
            return UTF8;
        }
    }
    
    public static final void writeTo(InputStream in, OutputStream out) throws IOException {
        int read;
        final byte[] data = new byte[2048];
        while ((read = in.read(data)) != -1)
            out.write(data, 0, read);
    }
    
    public static final void writeTo(Reader in, Writer out) throws IOException {
        int read;
        final char[] data = new char[2048];
        while ((read = in.read(data)) != -1)
            out.write(data, 0, read);
    }
    
    public static final String readFromAsString(InputStream in, 
            MediaType type) throws IOException {
        Reader reader = new InputStreamReader(in, getCharset(type));
        StringBuilder sb = new StringBuilder();
        char[] c = new char[1024];
        int l;
        while ((l = reader.read(c)) != -1) {
            sb.append(c, 0, l);
        } 
        return sb.toString();
    }
    
    public static final void writeToAsString(String s, OutputStream out, 
            MediaType type) throws IOException {
        Writer osw = new BufferedWriter(new OutputStreamWriter(out, 
                getCharset(type, UTF8)));        
        osw.write(s);
        osw.flush();        
    }
    
    // MessageBodyWriter
    
    public long getSize(T t) {
        return -1;
    }
}