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/*
 *  Copyright 2008-2010 biaoping.yin
 *
 *  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 org.frameworkset.http.converter;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.frameworkset.http.HttpInputMessage;
import org.frameworkset.http.HttpOutputMessage;
import org.frameworkset.http.MediaType;
import org.frameworkset.util.FileCopyUtils;
import org.frameworkset.util.annotations.ValueConstants;

/**
 * Implementation of {@link HttpMessageConverter} that can read and write byte arrays.
 *
 * By default, this converter supports all media types (*/*), and writes with a {@code
 * Content-Type} of {@code application/octet-stream}. This can be overridden by setting the {@link
 * #setSupportedMediaTypes(java.util.List) supportedMediaTypes} property.
 *
 * @author Arjen Poutsma
 * @since 3.0
 */
public class ByteArrayHttpMessageConverter extends AbstractHttpMessageConverter {

	/** Creates a new instance of the {@code ByteArrayHttpMessageConverter}. */
	public ByteArrayHttpMessageConverter() {
		super(new MediaType("application", "octet-stream"), MediaType.ALL);
	}

	@Override
	public boolean supports(Class clazz) {
		return byte[].class.equals(clazz);
	}

	@Override
	public byte[] readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException {
		long contentLength = inputMessage.getHeaders().getContentLength();
		if (contentLength >= 0) {
			ByteArrayOutputStream bos = new ByteArrayOutputStream((int) contentLength);
			FileCopyUtils.copy(inputMessage.getBody(), bos);
			return bos.toByteArray();
		}
		else {
			return FileCopyUtils.copyToByteArray(inputMessage.getBody());
		}
	}

	@Override
	public Long getContentLength(byte[] bytes, MediaType contentType) {
		return (long) bytes.length;
	}

	@Override
	public void writeInternal(byte[] bytes, HttpOutputMessage outputMessage,HttpInputMessage inputMessage) throws IOException {
		FileCopyUtils.copy(bytes, outputMessage.getBody());
	}
	 
	public boolean canWrite(String datatype) {
		// TODO Auto-generated method stub
		if(datatype == null)
			return false;
		
		if(datatype.equals(ValueConstants.datatype_bytearray))
				return true;
		else
			return false;
	}
	
	public boolean canWrite(MediaType mediaType)
	{
		return true;
	}
}