/*
* 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.ProtocolDecoderOutput;
/**
* Consumes until a fixed (ASCII) character is reached.
* The terminator is skipped.
*
* @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 ConsumeToTerminatorDecodingState implements DecodingState {
private final byte terminator;
private IoBuffer buffer;
/**
* @param terminator The terminator character
*/
public ConsumeToTerminatorDecodingState(byte terminator) {
this.terminator = terminator;
}
public DecodingState decode(IoBuffer in, ProtocolDecoderOutput out)
throws Exception {
int terminatorPos = in.indexOf(terminator);
if (terminatorPos >= 0) {
int limit = in.limit();
IoBuffer product;
if (in.position() < terminatorPos) {
in.limit(terminatorPos);
if (buffer == null) {
product = in.slice();
} else {
buffer.put(in);
product = buffer.flip();
buffer = null;
}
in.limit(limit);
} else {
// When input contained only terminator rather than actual data...
if (buffer == null) {
product = IoBuffer.allocate(0);
} else {
product = buffer.flip();
buffer = null;
}
}
in.position(terminatorPos + 1);
return finishDecode(product, out);
} else {
if (buffer == null) {
buffer = IoBuffer.allocate(in.remaining());
buffer.setAutoExpand(true);
}
buffer.put(in);
return this;
}
}
public DecodingState finishDecode(ProtocolDecoderOutput out)
throws Exception {
IoBuffer product;
// When input contained only terminator rather than actual data...
if (buffer == null) {
product = IoBuffer.allocate(0);
} else {
product = buffer.flip();
buffer = null;
}
return finishDecode(product, out);
}
protected abstract DecodingState finishDecode(IoBuffer product,
ProtocolDecoderOutput out) throws Exception;
}