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/*
*
* 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.qpid.amqp_1_0.codec;
import java.nio.ByteBuffer;
public abstract class FixedFourWriter<T extends Object> implements ValueWriter<T>
{
private int _written = 5;
private int _value;
public final int writeToBuffer(ByteBuffer buffer)
{
int remaining = buffer.remaining();
int written = _written;
switch(written)
{
case 0:
if(remaining-- != 0)
{
buffer.put(getFormatCode());
written = 1;
}
else
{
break;
}
case 1:
if(remaining>=4)
{
buffer.putInt(_value);
written = 5;
break;
}
else if(remaining-- != 0)
{
buffer.put((byte)((_value >> 24)&0xFF));
written = 2;
}
else
{
break;
}
case 2:
if(remaining-- != 0)
{
buffer.put((byte)((_value >> 16)&0xFF));
written = 3;
}
else
{
break;
}
case 3:
if(remaining-- != 0)
{
buffer.put((byte)((_value >> 8)&0xFF));
written = 4;
}
else
{
break;
}
case 4:
if(remaining-- != 0)
{
buffer.put((byte)(_value&0xFF));
written = 5;
}
}
_written = written;
return 5;
}
abstract byte getFormatCode();
public final void setValue(T value)
{
if(_written==1)
{
// TODO - remove
System.out.println("Remove");
}
_written = 0;
_value = convertValueToInt(value);
}
abstract int convertValueToInt(T value);
public boolean isCacheable()
{
return true;
}
public final boolean isComplete()
{
return _written == 5;
}
}
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