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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.framing;
import org.apache.mina.common.ByteBuffer;
/**
* AMQTypedValue combines together a native Java Object value, and an {@link AMQType}, as a fully typed AMQP parameter
* value. It provides the ability to read and write fully typed parameters to and from byte buffers. It also provides
* the ability to create such parameters from Java native value and a type tag or to extract the native value and type
* from one.
*
* <p/><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities <th> Collaborations
* <tr><td> Create a fully typed AMQP value from a native type and a type tag. <td> {@link AMQType}
* <tr><td> Create a fully typed AMQP value from a binary representation in a byte buffer. <td> {@link AMQType}
* <tr><td> Write a fully typed AMQP value to a binary representation in a byte buffer. <td> {@link AMQType}
* <tr><td> Extract the type from a fully typed AMQP value.
* <tr><td> Extract the value from a fully typed AMQP value.
* </table>
*/
public class AMQTypedValue
{
/** The type of the value. */
private final AMQType _type;
/** The Java native representation of the AMQP typed value. */
private final Object _value;
public AMQTypedValue(AMQType type, Object value)
{
if (type == null)
{
throw new NullPointerException("Cannot create a typed value with null type");
}
_type = type;
_value = type.toNativeValue(value);
}
private AMQTypedValue(AMQType type, ByteBuffer buffer)
{
_type = type;
_value = type.readValueFromBuffer(buffer);
}
public AMQType getType()
{
return _type;
}
public Object getValue()
{
return _value;
}
public void writeToBuffer(ByteBuffer buffer)
{
_type.writeToBuffer(_value, buffer);
}
public int getEncodingSize()
{
return _type.getEncodingSize(_value);
}
public static AMQTypedValue readFromBuffer(ByteBuffer buffer)
{
AMQType type = AMQTypeMap.getType(buffer.get());
return new AMQTypedValue(type, buffer);
}
public String toString()
{
return "[" + getType() + ": " + getValue() + "]";
}
public boolean equals(Object o)
{
if(o instanceof AMQTypedValue)
{
AMQTypedValue other = (AMQTypedValue) o;
return _type == other._type && (_value == null ? other._value == null : _value.equals(other._value));
}
else
{
return false;
}
}
public int hashCode()
{
return _type.hashCode() ^ (_value == null ? 0 : _value.hashCode());
}
}
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