netty5/src/main/java/org/jboss/netty/handler/codec/http/HttpChunk.java

/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat 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.jboss.netty.handler.codec.http;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelPipeline;

/**
 * An HTTP chunk which is used for HTTP chunked transfer-encoding.
 * {@link HttpMessageDecoder} generates {@link HttpChunk} after
 * {@link HttpMessage} when the content is large or the encoding of the content
 * is 'chunked.  If you prefer not to receive {@link HttpChunk} in your handler,
 * please {@link HttpChunkAggregator} after {@link HttpMessageDecoder} in the
 * {@link ChannelPipeline}.
 *
 * @author The Netty Project (netty-dev@lists.jboss.org)
 * @author Trustin Lee (trustin@gmail.com)
 * @version $Rev$, $Date$
 *
 * @apiviz.landmark
 */
public interface HttpChunk {

    /**
     * The 'end of content' marker in chunked encoding.
     */
    static HttpChunk LAST_CHUNK = new HttpChunk() {
        public ChannelBuffer getContent() {
            return ChannelBuffers.EMPTY_BUFFER;
        }

        public boolean isLast() {
            return true;
        }
    };

    /**
     * Returns {@code true} if and only if this chunk is the 'end of content'
     * marker.
     */
    boolean isLast();

    /**
     * Returns the content of this chunk.  If this is the 'end of content'
     * marker, {@link ChannelBuffers#EMPTY_BUFFER} will be returned.
     */
    ChannelBuffer getContent();
}