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 }