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/*******************************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.wink.common.internal.providers.entity;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.nio.charset.Charset;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.apache.wink.common.internal.utils.MediaTypeUtils;
import org.apache.wink.common.utils.ProviderUtils;

@Provider
@Consumes
@Produces
public class StringProvider implements MessageBodyReader, MessageBodyWriter {

    public boolean isReadable(Class type,
                              Type genericType,
                              Annotation[] annotations,
                              MediaType mediaType) {
        return type.isAssignableFrom(String.class);
    }

    public String readFrom(Class type,
                           Type genericType,
                           Annotation[] annotations,
                           MediaType mediaType,
                           MultivaluedMap httpHeaders,
                           InputStream entityStream) throws IOException, WebApplicationException {
        byte[] bytes = ProviderUtils.readFromStreamAsBytes(entityStream);
        return new String(bytes, ProviderUtils.getCharset(mediaType));
    }

    public long getSize(String t,
                        Class type,
                        Type genericType,
                        Annotation[] annotations,
                        MediaType mediaType) {
        return -1;
    }

    public boolean isWriteable(Class type,
                               Type genericType,
                               Annotation[] annotations,
                               MediaType mediaType) {
        return type == String.class;
    }

    public void writeTo(String t,
                        Class type,
                        Type genericType,
                        Annotation[] annotations,
                        MediaType mediaType,
                        MultivaluedMap httpHeaders,
                        OutputStream entityStream) throws IOException, WebApplicationException {
        mediaType = MediaTypeUtils.setDefaultCharsetOnMediaTypeHeader(httpHeaders, mediaType);
        Charset charset = Charset.forName(ProviderUtils.getCharset(mediaType));
        OutputStreamWriter writer = new OutputStreamWriter(entityStream, charset);
        BufferedWriter bw = new BufferedWriter(writer);
        bw.write(t, 0, t.length());
        bw.flush();
    }

}