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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;
import java.util.List;
public class ListWriter implements ValueWriter<List>
{
private static class NonEmptyListWriter extends AbstractListWriter<List>
{
private List _list;
private int _position = 0;
public NonEmptyListWriter(final Registry registry)
{
super(registry);
}
@Override
protected void onSetValue(final List value)
{
_list = value;
_position = 0;
}
@Override
protected int getCount()
{
return _list.size();
}
@Override
protected boolean hasNext()
{
return _position < getCount();
}
@Override
protected Object next()
{
return _list.get(_position++);
}
@Override
protected void clear()
{
_list = null;
_position = 0;
}
@Override
protected void reset()
{
_position = 0;
}
}
private final NonEmptyListWriter _nonEmptyListWriter;
private static final byte ZERO_BYTE_FORMAT_CODE = (byte) 0x45;
private final ValueWriter<List> _emptyListWriter = new EmptyListValueWriter();
private ValueWriter<List> _delegate;
public ListWriter(final Registry registry)
{
_nonEmptyListWriter = new NonEmptyListWriter(registry);
}
public int writeToBuffer(ByteBuffer buffer)
{
return _delegate.writeToBuffer(buffer);
}
public void setValue(List frameBody)
{
if(frameBody.isEmpty())
{
_delegate = _emptyListWriter;
}
else
{
_delegate = _nonEmptyListWriter;
}
_delegate.setValue(frameBody);
}
public boolean isComplete()
{
return _delegate.isComplete();
}
public boolean isCacheable()
{
return false;
}
private static Factory<List> FACTORY = new Factory<List>()
{
public ValueWriter<List> newInstance(Registry registry)
{
return new ListWriter(registry);
}
};
public static void register(ValueWriter.Registry registry)
{
registry.register(List.class, FACTORY);
}
public static class EmptyListValueWriter implements ValueWriter<List>
{
private boolean _complete;
public int writeToBuffer(ByteBuffer buffer)
{
if(!_complete && buffer.hasRemaining())
{
buffer.put(ZERO_BYTE_FORMAT_CODE);
_complete = true;
}
return 1;
}
public void setValue(List list)
{
_complete = false;
}
public boolean isCacheable()
{
return true;
}
public boolean isComplete()
{
return _complete;
}
}
}
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