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    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * License.  You may obtain a copy of the License at:
    7    *
    8    *    http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.handler.codec.embedder;
    17
    18  import static org.jboss.netty.channel.Channels.*;
    19
    20  import org.jboss.netty.buffer.ChannelBuffer;
    21  import org.jboss.netty.buffer.ChannelBufferFactory;
    22  import org.jboss.netty.buffer.ChannelBuffers;
    23  import org.jboss.netty.channel.ChannelPipeline;
    24  import org.jboss.netty.channel.ChannelUpstreamHandler;
    25  import org.jboss.netty.handler.codec.base64.Base64Decoder;
    26  import org.jboss.netty.handler.codec.string.StringDecoder;
    27
    28  /**
    29   * A helper that wraps a decoder so that it can be used without doing actual
    30   * I/O in unit tests or higher level codecs.  For example, you can decode a
    31   * Base64-encoded {@link ChannelBuffer} with {@link Base64Decoder} and
    32   * {@link StringDecoder} without setting up the {@link ChannelPipeline} and
    33   * other mock objects by yourself:
    34   * <pre>
    35   * {@link ChannelBuffer} base64Data = {@link ChannelBuffers}.copiedBuffer("Zm9vYmFy", CharsetUtil.US_ASCII);
    36   *
    37   * {@link DecoderEmbedder}&lt;String&gt; embedder = new {@link DecoderEmbedder}&lt;String&gt;(
    38   *         new {@link Base64Decoder}(), new {@link StringDecoder}());
    39   *
    40   * embedded.offer(base64Data);
    41   *
    42   * String decoded = embedded.poll();
    43   * assert decoded.equals("foobar");
    44   * </pre>
    45   *
    46   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    47   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    48   * @version $Rev: 2122 $, $Date: 2010-02-02 11:00:04 +0900 (Tue, 02 Feb 2010) $
    49   *
    50   * @apiviz.landmark
    51   * @see EncoderEmbedder
    52   */
    53  public class DecoderEmbedder<E> extends AbstractCodecEmbedder<E> {
    54
    55      /**
    56       * Creates a new embedder whose pipeline is composed of the specified
    57       * handlers.
    58       */
    59      public DecoderEmbedder(ChannelUpstreamHandler... handlers) {
    60          super(handlers);
    61      }
    62
    63      /**
    64       * Creates a new embedder whose pipeline is composed of the specified
    65       * handlers.
    66       *
    67       * @param bufferFactory the {@link ChannelBufferFactory} to be used when
    68       *                      creating a new buffer.
    69       */
    70      public DecoderEmbedder(ChannelBufferFactory bufferFactory, ChannelUpstreamHandler... handlers) {
    71          super(bufferFactory, handlers);
    72      }
    73
    74      public boolean offer(Object input) {
    75          fireMessageReceived(getChannel(), input);
    76          return !super.isEmpty();
    77      }
    78  }