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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 AbstractDescribedTypeWriter<V> implements ValueWriter<V>
{
private int _length;
private Registry _registry;
private static final int LARGE_COMPOUND_THRESHOLD_COUNT = 10;
private ValueWriter _delegate;
private static final byte DESCRIBED_TYPE = (byte)0;
public AbstractDescribedTypeWriter(final Registry registry)
{
_registry = registry;
}
enum State {
FORMAT_CODE,
DESCRIPTOR,
DESCRIBED,
DONE
}
private State _state = State.FORMAT_CODE;
public int writeToBuffer(ByteBuffer buffer)
{
final int length = _length;
if(length == -1)
{
writeFirstPass(buffer);
}
else
{
State state = _state;
switch(state)
{
case FORMAT_CODE:
if(buffer.hasRemaining())
{
buffer.put(DESCRIBED_TYPE);
state = State.DESCRIPTOR;
_delegate = createDescriptorWriter();
}
else
{
break;
}
case DESCRIPTOR:
if(buffer.hasRemaining())
{
_delegate.writeToBuffer(buffer);
if(_delegate.isComplete())
{
state = State.DESCRIBED;
_delegate = createDescribedWriter();
}
else
{
break;
}
}
case DESCRIBED:
if(buffer.hasRemaining())
{
_delegate.writeToBuffer(buffer);
if(_delegate.isComplete())
{
state = State.DONE;
_delegate = null;
}
else
{
break;
}
}
}
_state = state;
}
return _length;
}
private void writeFirstPass(ByteBuffer buffer)
{
int length = 1;
State state = State.FORMAT_CODE;
ValueWriter descriptorWriter = createDescriptorWriter();
if(buffer.hasRemaining())
{
buffer.put(DESCRIBED_TYPE);
state = State.DESCRIPTOR;
_delegate = descriptorWriter;
}
length += descriptorWriter.writeToBuffer(buffer);
ValueWriter describedWriter = createDescribedWriter();
if(descriptorWriter.isComplete())
{
state = State.DESCRIBED;
_delegate = describedWriter;
}
length += describedWriter.writeToBuffer(buffer);
if(describedWriter.isComplete())
{
_delegate = null;
state = State.DONE;
}
_state = state;
_length = length;
}
public void setValue(V value)
{
_length = -1;
_delegate = null;
_state = State.FORMAT_CODE;
onSetValue(value);
}
public void setRegistry(Registry registry)
{
_registry = registry;
}
protected Registry getRegistry()
{
return _registry;
}
protected abstract void onSetValue(final V value);
protected abstract void clear();
protected abstract ValueWriter createDescribedWriter();
protected abstract Object getDescriptor();
protected final ValueWriter createDescriptorWriter()
{
return getRegistry().getValueWriter(getDescriptor());
}
public boolean isComplete()
{
return _state == State.DONE;
}
public boolean isCacheable()
{
return false;
}
}
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