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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and asynchronously process the HTTP responses.

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/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package com.ning.http.client.providers.netty.request.body;

import com.ning.http.client.Body;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.handler.stream.ChunkedInput;

import java.nio.ByteBuffer;

/**
 * Adapts a {@link Body} to Netty's {@link ChunkedInput}.
 */
public class BodyChunkedInput implements ChunkedInput {

    private static final int DEFAULT_CHUNK_SIZE = 8 * 1024;

    private final Body body;
    private final int contentLength;
    private final int chunkSize;

    private boolean endOfInput;

    public BodyChunkedInput(Body body) {
        if (body == null)
            throw new NullPointerException("body");
        this.body = body;
        contentLength = (int) body.getContentLength();
        if (contentLength <= 0)
            chunkSize = DEFAULT_CHUNK_SIZE;
        else
            chunkSize = Math.min(contentLength, DEFAULT_CHUNK_SIZE);
    }

    public boolean hasNextChunk() throws Exception {
        // unused
        throw new UnsupportedOperationException();
    }

    public Object nextChunk() throws Exception {
        if (endOfInput)
            return null;

        ByteBuffer buffer = ByteBuffer.allocate(chunkSize);
        long r = body.read(buffer);
        if (r < 0L) {
            endOfInput = true;
            return null;
        } else if (r == 0 && body instanceof FeedableBodyGenerator.PushBody) {
            //this will suspend the stream in ChunkedWriteHandler
            return null;
        } else {
            endOfInput = r == contentLength || r < chunkSize && contentLength > 0;
            buffer.flip();
            return ChannelBuffers.wrappedBuffer(buffer);
        }
    }

    public boolean isEndOfInput() throws Exception {
        // called by ChunkedWriteHandler AFTER nextChunk
        return endOfInput;
    }

    public void close() throws Exception {
        body.close();
    }
}