/*
* 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;
/**
* A {@link DecodingState} which consumes all received bytes until a configured
* number of read bytes has been reached. Please note that this state can
* produce the buffer with less data if the associated session has been
* closed unexpectedly.
*
* @author The Apache MINA Project (dev@mina.apache.org)
* @version $Rev: 657740 $, $Date: 2008-05-19 16:24:46 +0900 (Mon, 19 May 2008) $
*/
public abstract class ConsumeToEndOfSessionDecodingState implements DecodingState {
private IoBuffer buffer;
private final int maxLength;
public ConsumeToEndOfSessionDecodingState(int maxLength) {
this.maxLength = maxLength;
}
public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out)
throws Exception {
if (buffer == null) {
buffer = IoBuffer.allocate(256).setAutoExpand(true);
}
if (buffer.position() + in.remaining() > maxLength) {
throw new ProtocolDecoderException("Received data exceeds " + maxLength + " byte(s).");
}
buffer.put(in);
return this;
}
public DecodingState finishDecode(ProtocolDecoderOutput out)
throws Exception {
try {
if (buffer == null) {
buffer = IoBuffer.allocate(0);
}
buffer.flip();
return finishDecode(buffer, out);
} finally {
buffer = null;
}
}
protected abstract DecodingState finishDecode(IoBuffer readData,
ProtocolDecoderOutput out) throws Exception;
}