/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.mina.filter.codec.statemachine;
import org.apache.mina.common.IoBuffer;
import org.apache.mina.filter.codec.ProtocolDecoderException;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
/**
* @author The Apache MINA Project (dev@mina.apache.org)
* @version $Rev: 601994 $, $Date: 2007-12-07 13:58:00 +0900 (금, 07 12월 2007) $
*/
public abstract class IntegerDecodingState implements DecodingState {
private int firstByte;
private int secondByte;
private int thirdByte;
private int counter;
public IntegerDecodingState() {
}
public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out)
throws Exception {
while (in.hasRemaining()) {
switch (counter) {
case 0:
firstByte = in.getUnsigned();
break;
case 1:
secondByte = in.getUnsigned();
break;
case 2:
thirdByte = in.getUnsigned();
break;
case 3:
counter = 0;
return finishDecode(
(firstByte << 24) | (secondByte << 16) | (thirdByte << 8) | in.getUnsigned(),
out);
default:
throw new InternalError();
}
counter ++;
}
return this;
}
public DecodingState finishDecode(ProtocolDecoderOutput out)
throws Exception {
throw new ProtocolDecoderException(
"Unexpected end of session while waiting for an integer.");
}
protected abstract DecodingState finishDecode(int value,
ProtocolDecoderOutput out) throws Exception;
}