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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 org.apache.qpid.amqp_1_0.type.AmqpErrorException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.LinkedHashMap;
import java.util.Map;
public class StringTypeConstructor extends VariableWidthTypeConstructor
{
private Charset _charSet;
private BinaryString _defaultBinaryString = new BinaryString();
private ValueCache<BinaryString, String> _cachedValues = new ValueCache<BinaryString, String>(10);
private static final class ValueCache<K,V> extends LinkedHashMap<K,V>
{
private final int _cacheSize;
public ValueCache(int cacheSize)
{
_cacheSize = cacheSize;
}
@Override
protected boolean removeEldestEntry(Map.Entry<K, V> eldest)
{
return size() > _cacheSize;
}
public boolean isFull()
{
return size() == _cacheSize;
}
}
public static StringTypeConstructor getInstance(int i, Charset c)
{
return new StringTypeConstructor(i, c);
}
private StringTypeConstructor(int size, Charset c)
{
super(size);
_charSet = c;
}
@Override
public Object construct(final ByteBuffer in, boolean isCopy, ValueHandler handler) throws AmqpErrorException
{
int size;
if(getSize() == 1)
{
size = in.get() & 0xFF;
}
else
{
size = in.getInt();
}
int origPosition = in.position();
_defaultBinaryString.setData(in.array(), in.arrayOffset()+ origPosition, size);
BinaryString binaryStr = _defaultBinaryString;
boolean isFull = _cachedValues.isFull();
String str = isFull ? _cachedValues.remove(binaryStr) : _cachedValues.get(binaryStr);
if(str == null)
{
ByteBuffer dup = in.duplicate();
try
{
dup.limit(dup.position()+size);
}
catch(IllegalArgumentException e)
{
throw new IllegalArgumentException("position: " + dup.position() + "size: " + size + " capacity: " + dup.capacity());
}
CharBuffer charBuf = _charSet.decode(dup);
str = charBuf.toString();
byte[] data = new byte[size];
in.get(data);
binaryStr = new BinaryString(data, 0, size);
_cachedValues.put(binaryStr, str);
}
else if(isFull)
{
byte[] data = new byte[size];
in.get(data);
binaryStr = new BinaryString(data, 0, size);
_cachedValues.put(binaryStr, str);
}
in.position(origPosition+size);
return str;
}
}
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