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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.embedder;

import static org.jboss.netty.channel.Channels.*;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBufferFactory;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelUpstreamHandler;
import org.jboss.netty.handler.codec.base64.Base64Decoder;
import org.jboss.netty.handler.codec.string.StringDecoder;

/**
 * A helper that wraps a decoder so that it can be used without doing actual
 * I/O in unit tests or higher level codecs.  For example, you can decode a
 * Base64-encoded {@link ChannelBuffer} with {@link Base64Decoder} and
 * {@link StringDecoder} without setting up the {@link ChannelPipeline} and
 * other mock objects by yourself:
 *  * {@link ChannelBuffer} base64Data = {@link ChannelBuffers}.copiedBuffer("Zm9vYmFy", CharsetUtil.US_ASCII);
 *
 * {@link DecoderEmbedder}<String> embedder = new {@link DecoderEmbedder}<String>(
 *         new {@link Base64Decoder}(), new {@link StringDecoder}());
 *
 * embedder.offer(base64Data);
 *
 * String decoded = embedder.poll();
 * assert decoded.equals("foobar");
 * 
 * @apiviz.landmark
 * @see EncoderEmbedder
 */
public class DecoderEmbedder extends AbstractCodecEmbedder {

    /**
     * Creates a new embedder whose pipeline is composed of the specified
     * handlers.
     */
    public DecoderEmbedder(ChannelUpstreamHandler... handlers) {
        super(handlers);
    }

    /**
     * Creates a new embedder whose pipeline is composed of the specified
     * handlers.
     *
     * @param bufferFactory the {@link ChannelBufferFactory} to be used when
     *                      creating a new buffer.
     */
    public DecoderEmbedder(ChannelBufferFactory bufferFactory, ChannelUpstreamHandler... handlers) {
        super(bufferFactory, handlers);
    }

    public boolean offer(Object input) {
        fireMessageReceived(getChannel(), input);
        return !isEmpty();
    }
}