org.apache.qpid.proton.codec.impl.DescribedTypeElement Maven / Gradle / Ivy
/*
*
* 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.proton.codec.impl;
import java.nio.ByteBuffer;
import java.util.AbstractSequentialList;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import org.apache.qpid.proton.amqp.DescribedType;
import org.apache.qpid.proton.codec.Data;
class DescribedTypeElement extends AbstractElement
{
private Element _first;
DescribedTypeElement(Element parent, Element prev)
{
super(parent, prev);
}
@Override
public int size()
{
int count = 0;
int size = 0;
Element elt = _first;
while(elt != null)
{
count++;
size += elt.size();
elt = elt.next();
}
if(isElementOfArray())
{
throw new IllegalArgumentException("Cannot add described type members to an array");
}
else if(count > 2)
{
throw new IllegalArgumentException("Too many elements in described type");
}
else if(count == 0)
{
size = 3;
}
else if(count == 1)
{
size += 2;
}
else
{
size+=1;
}
return size;
}
@Override
public DescribedType getValue()
{
final Object descriptor = _first == null ? null : _first.getValue();
Element second = _first == null ? null : _first.next();
final Object described = second == null ? null : second.getValue();
return new DescribedTypeImpl(descriptor,described);
}
@Override
public Data.DataType getDataType()
{
return Data.DataType.DESCRIBED;
}
@Override
public int encode(ByteBuffer b)
{
int encodedSize = size();
if(encodedSize > b.remaining())
{
return 0;
}
else
{
b.put((byte) 0);
if(_first == null)
{
b.put((byte)0x40);
b.put((byte)0x40);
}
else
{
_first.encode(b);
if(_first.next() == null)
{
b.put((byte)0x40);
}
else
{
_first.next().encode(b);
}
}
}
return encodedSize;
}
@Override
public boolean canEnter()
{
return true;
}
@Override
public Element child()
{
return _first;
}
@Override
public void setChild(Element elt)
{
_first = elt;
}
@Override
public Element checkChild(Element element)
{
if(element.prev() != _first)
{
throw new IllegalArgumentException("Described Type may only have two elements");
}
return element;
}
@Override
public Element addChild(Element element)
{
_first = element;
return element;
}
@Override
String startSymbol() {
return "(";
}
@Override
String stopSymbol() {
return ")";
}
}