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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 FixedTwoWriter <T extends Object> implements ValueWriter<T>
{
private int _written = 3;
private short _value;
public int writeToBuffer(ByteBuffer buffer)
{
switch(_written)
{
case 0:
if(buffer.hasRemaining())
{
buffer.put(getFormatCode());
}
else
{
break;
}
case 1:
if(buffer.remaining()>1)
{
buffer.putShort(_value);
_written = 3;
}
else if(buffer.hasRemaining())
{
buffer.put((byte) (0xFF & (_value >> 8)));
_written = 2;
}
else
{
_written = 1;
}
break;
case 2:
if(buffer.hasRemaining())
{
buffer.put((byte)(0xFF & _value));
}
}
return 3;
}
public final void setValue(T value)
{
_written = 0;
_value = convertValueToShort(value);
}
abstract short convertValueToShort(T value);
public boolean isCacheable()
{
return true;
}
public boolean isComplete()
{
return _written == 3;
}
abstract byte getFormatCode();
}
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