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    1   /***
    2    *
    3    * Copyright 2004 Hiram Chirino
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18  package org.activeio.filter;
    19
    20  import java.io.IOException;
    21
    22  import org.activeio.FilterSynchChannel;
    23  import org.activeio.Packet;
    24  import org.activeio.SynchChannel;
    25
    26  /***
    27   *
    28   */
    29  public class PushbackSynchChannel extends FilterSynchChannel {
    30
    31      private Packet putback;
    32
    33      public PushbackSynchChannel(SynchChannel next) {
    34          this(next, null);
    35      }
    36
    37      public PushbackSynchChannel(SynchChannel next, Packet putback) {
    38          super(next);
    39          this.putback=putback;
    40      }
    41
    42      public void putback(Packet packet) {
    43          this.putback = packet;
    44      }
    45
    46      public Packet read(long timeout) throws IOException {
    47          if(putback!=null ) {
    48              Packet p = putback;
    49              putback=null;
    50              return p;
    51          }
    52          return super.read(timeout);
    53      }
    54
    55  }