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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 org.apache.qpid.amqp_1_0.type.Symbol;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.util.concurrent.ConcurrentHashMap;
public class SymbolTypeConstructor extends VariableWidthTypeConstructor
{
private static final Charset ASCII = Charset.forName("US-ASCII");
private BinaryString _defaultBinaryString = new BinaryString();
private static final ConcurrentHashMap<BinaryString, Symbol> SYMBOL_MAP =
new ConcurrentHashMap<BinaryString, Symbol>(2048);
public static SymbolTypeConstructor getInstance(int i)
{
return new SymbolTypeConstructor(i);
}
private SymbolTypeConstructor(int size)
{
super(size);
}
@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();
}
_defaultBinaryString.setData(in.array(), in.arrayOffset()+in.position(), size);
BinaryString binaryStr = _defaultBinaryString;
Symbol symbolVal = SYMBOL_MAP.get(binaryStr);
if(symbolVal == null)
{
ByteBuffer dup = in.duplicate();
try
{
dup.limit(in.position()+size);
}
catch (IllegalArgumentException e)
{
System.err.println("in.position(): " + in.position());
System.err.println("size: " + size);
System.err.println("dup.position(): " + dup.position());
System.err.println("dup.capacity(): " + dup.capacity());
System.err.println("dup.limit(): " + dup.limit());
throw e;
}
CharBuffer charBuf = ASCII.decode(dup);
symbolVal = Symbol.getSymbol(charBuf.toString());
byte[] data = new byte[size];
in.get(data);
binaryStr = new BinaryString(data, 0, size);
SYMBOL_MAP.putIfAbsent(binaryStr, symbolVal);
}
else
{
in.position(in.position()+size);
}
return symbolVal;
}
}
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