org.apache.qpid.proton.codec.ListType Maven / Gradle / Ivy
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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.proton.codec;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
public class ListType extends AbstractPrimitiveType
{
private final ListEncoding _listEncoding;
private final ListEncoding _shortListEncoding;
private final ListEncoding _zeroListEncoding;
private EncoderImpl _encoder;
private static interface ListEncoding extends PrimitiveTypeEncoding
{
void setValue(List value, int length);
}
ListType(final EncoderImpl encoder, final DecoderImpl decoder)
{
_encoder = encoder;
_listEncoding = new AllListEncoding(encoder, decoder);
_shortListEncoding = new ShortListEncoding(encoder, decoder);
_zeroListEncoding = new ZeroListEncoding(encoder, decoder);
encoder.register(List.class, this);
decoder.register(this);
}
public Class getTypeClass()
{
return List.class;
}
public ListEncoding getEncoding(final List val)
{
int calculatedSize = calculateSize(val, _encoder);
ListEncoding encoding = val.isEmpty()
? _zeroListEncoding
: (val.size() > 255 || calculatedSize >= 254)
? _listEncoding
: _shortListEncoding;
encoding.setValue(val, calculatedSize);
return encoding;
}
private static int calculateSize(final List val, EncoderImpl encoder)
{
int len = 0;
final int count = val.size();
for(int i = 0; i < count; i++)
{
Object element = val.get(i);
AMQPType type = encoder.getType(element);
if(type == null)
{
throw new IllegalArgumentException("No encoding defined for type: " + element.getClass());
}
TypeEncoding elementEncoding = type.getEncoding(element);
len += elementEncoding.getConstructorSize()+elementEncoding.getValueSize(element);
}
return len;
}
public ListEncoding getCanonicalEncoding()
{
return _listEncoding;
}
public Collection getAllEncodings()
{
return Arrays.asList(_zeroListEncoding, _shortListEncoding, _listEncoding);
}
private class AllListEncoding
extends LargeFloatingSizePrimitiveTypeEncoding
implements ListEncoding
{
private List _value;
private int _length;
public AllListEncoding(final EncoderImpl encoder, final DecoderImpl decoder)
{
super(encoder, decoder);
}
@Override
protected void writeEncodedValue(final List val)
{
getEncoder().writeRaw(val.size());
final int count = val.size();
for(int i = 0; i < count; i++)
{
Object element = val.get(i);
TypeEncoding elementEncoding = getEncoder().getType(element).getEncoding(element);
elementEncoding.writeConstructor();
elementEncoding.writeValue(element);
}
}
@Override
protected int getEncodedValueSize(final List val)
{
return 4 + ((val == _value) ? _length : calculateSize(val, getEncoder()));
}
@Override
public byte getEncodingCode()
{
return EncodingCodes.LIST32;
}
public ListType getType()
{
return ListType.this;
}
public boolean encodesSuperset(final TypeEncoding encoding)
{
return (getType() == encoding.getType());
}
public List readValue()
{
DecoderImpl decoder = getDecoder();
int size = decoder.readRawInt();
// todo - limit the decoder with size
int count = decoder.readRawInt();
// Ensure we do not allocate an array of size greater then the available data, otherwise there is a risk for an OOM error
if (count > decoder.getByteBufferRemaining()) {
throw new IllegalArgumentException("List element count "+count+" is specified to be greater than the amount of data available ("+
decoder.getByteBufferRemaining()+")");
}
List list = new ArrayList(count);
for(int i = 0; i < count; i++)
{
list.add(decoder.readObject());
}
return list;
}
public void setValue(final List value, final int length)
{
_value = value;
_length = length;
}
}
private class ShortListEncoding
extends SmallFloatingSizePrimitiveTypeEncoding
implements ListEncoding
{
private List _value;
private int _length;
public ShortListEncoding(final EncoderImpl encoder, final DecoderImpl decoder)
{
super(encoder, decoder);
}
@Override
protected void writeEncodedValue(final List val)
{
getEncoder().writeRaw((byte)val.size());
final int count = val.size();
for(int i = 0; i < count; i++)
{
Object element = val.get(i);
TypeEncoding elementEncoding = getEncoder().getType(element).getEncoding(element);
elementEncoding.writeConstructor();
elementEncoding.writeValue(element);
}
}
@Override
protected int getEncodedValueSize(final List val)
{
return 1 + ((val == _value) ? _length : calculateSize(val, getEncoder()));
}
@Override
public byte getEncodingCode()
{
return EncodingCodes.LIST8;
}
public ListType getType()
{
return ListType.this;
}
public boolean encodesSuperset(final TypeEncoding encoder)
{
return encoder == this;
}
public List readValue()
{
DecoderImpl decoder = getDecoder();
int size = ((int)decoder.readRawByte()) & 0xff;
// todo - limit the decoder with size
int count = ((int)decoder.readRawByte()) & 0xff;
List list = new ArrayList(count);
for(int i = 0; i < count; i++)
{
list.add(decoder.readObject());
}
return list;
}
public void setValue(final List value, final int length)
{
_value = value;
_length = length;
}
}
private class ZeroListEncoding
extends FixedSizePrimitiveTypeEncoding
implements ListEncoding
{
public ZeroListEncoding(final EncoderImpl encoder, final DecoderImpl decoder)
{
super(encoder, decoder);
}
@Override
public byte getEncodingCode()
{
return EncodingCodes.LIST0;
}
@Override
protected int getFixedSize()
{
return 0;
}
public ListType getType()
{
return ListType.this;
}
public void setValue(List value, int length)
{
}
public void writeValue(final List val)
{
}
public boolean encodesSuperset(final TypeEncoding encoder)
{
return encoder == this;
}
public List readValue()
{
return Collections.EMPTY_LIST;
}
}
}