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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.transport.AmqpError;
import java.lang.reflect.Array;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
public abstract class ArrayTypeConstructor implements TypeConstructor<Object[]>
{
public Object[] construct(final ByteBuffer in, final ValueHandler handler) throws AmqpErrorException
{
int size = read(in);
if(in.remaining() < size)
{
throw new AmqpErrorException(AmqpError.DECODE_ERROR,
"Insufficient data to decode array - requires %d octects, only %d remaining.",
size, in.remaining());
}
ByteBuffer dup = in.slice();
dup.limit(size);
in.position(in.position()+size);
int count = read(dup);
TypeConstructor t = handler.readConstructor(dup);
List rval = new ArrayList(count);
for(int i = 0; i < count; i++)
{
rval.add(t.construct(dup, handler));
}
if(dup.hasRemaining())
{
throw new AmqpErrorException(AmqpError.DECODE_ERROR,
"Array incorrectly encoded, %d bytes remaining after decoding %d elements",
dup.remaining(), count);
}
if(rval.size() == 0)
{
return null;
}
else
{
return rval.toArray((Object[])Array.newInstance(rval.get(0).getClass(), rval.size()));
}
}
abstract int read(ByteBuffer in) throws AmqpErrorException;
private static final ArrayTypeConstructor ONE_BYTE_SIZE_ARRAY = new ArrayTypeConstructor()
{
@Override int read(final ByteBuffer in) throws AmqpErrorException
{
if(!in.hasRemaining())
{
throw new AmqpErrorException(AmqpError.DECODE_ERROR, "Insufficient data to decode array");
}
return ((int)in.get()) & 0xff;
}
};
private static final ArrayTypeConstructor FOUR_BYTE_SIZE_ARRAY = new ArrayTypeConstructor()
{
@Override int read(final ByteBuffer in) throws AmqpErrorException
{
if(in.remaining()<4)
{
throw new AmqpErrorException(AmqpError.DECODE_ERROR, "Insufficient data to decode array");
}
return in.getInt();
}
};
public static ArrayTypeConstructor getOneByteSizeTypeConstructor()
{
return ONE_BYTE_SIZE_ARRAY;
}
public static ArrayTypeConstructor getFourByteSizeTypeConstructor()
{
return FOUR_BYTE_SIZE_ARRAY;
}
}
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