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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 FixedSixteenWriter<T extends Object> implements ValueWriter<T>
{
private int _written = 17;
private long _msb;
private long _lsb;
public final int writeToBuffer(ByteBuffer buffer)
{
int remaining = buffer.remaining();
int written = _written;
switch(written)
{
case 0:
if(buffer.hasRemaining())
{
buffer.put(getFormatCode());
remaining--;
written = 1;
}
else
{
break;
}
case 1:
if(remaining>=8)
{
buffer.putLong(_msb);
written = 9;
break;
}
case 2:
case 3:
case 4:
case 5:
if(remaining >= 4)
{
buffer.putInt((int)((_msb >> ((5-written)<<3)) & 0xFFFFFFFF ));
remaining-=4;
written+=4;
}
case 6:
case 7:
if(remaining >= 2 && written <= 7)
{
buffer.putShort((short)((_msb >> ((7-written)<<3)) & 0xFFFF ));
remaining -= 2;
written += 2;
}
case 8:
if(remaining >=1 && written != 9)
{
buffer.put((byte)((_msb >> ((8-written)<<3)) & 0xFF ));
written++;
}
}
if(remaining != 0)
{
switch(written)
{
case 9:
if(remaining>=8)
{
buffer.putLong(_lsb);
written = 17;
break;
}
case 10:
case 11:
case 12:
case 13:
if(remaining >= 4)
{
buffer.putInt((int)((_lsb >> ((13-written)<<3)) & 0xFFFFFFFF ));
remaining-=4;
written+=4;
}
case 14:
case 15:
if(remaining >= 2 && written <= 15)
{
buffer.putShort((short)((_lsb >> ((15-written)<<3)) & 0xFFFF ));
remaining -= 2;
written += 2;
}
case 16:
if(remaining >=1 && written != 17)
{
buffer.put((byte)((_msb >> ((16-written)<<3)) & 0xFF ));
written++;
}
}
}
_written = written;
return 17;
}
abstract byte getFormatCode();
public final void setValue(T value)
{
_written = 0;
_msb = convertValueToMSB(value);
_lsb = convertValueToLSB(value);
}
abstract long convertValueToMSB(T value);
abstract long convertValueToLSB(T value);
public boolean isCacheable()
{
return true;
}
public final boolean isComplete()
{
return _written == 17;
}
}
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