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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.management.domain.model.type;
import java.io.Serializable;
import java.util.Arrays;
import java.util.UUID;
import org.apache.qpid.transport.codec.Encoder;
/**
* It is a simple wrapper for a byte array (for example a 128bin).
* It is used to let QMan deal with an object instead of an array.
*
* @author Andrea Gazzarini
*/
public final class Binary implements Serializable
{
private static final long serialVersionUID = -6865585077320637567L;
// Marker internal (empty) interface
private interface State extends Serializable{}
/**
* Internal state of this object used to denote the situation when the hashcode() method has never been called.
* After the hashcode has been computed this class switches the state of the outer object to the next state.
*/
State hashCodeNotYetComputed = new State()
{
private static final long serialVersionUID = 221632033761266959L;
@Override
public int hashCode ()
{
hashCode = Arrays.hashCode(_bytes);
state = hashCodeAlreadyComputed;
return hashCode;
}
};
/**
* Internal state of this object used to denote the situation where the hashcode() method has already been computed.
* Simply it returns the just computed value for the hashcode.
*/
State hashCodeAlreadyComputed = new State()
{
private static final long serialVersionUID = 221632033761266959L;
@Override
public int hashCode ()
{
return hashCode;
}
};
private final UUID uuid;
private final byte [] _bytes;
private long _first;
private int hashCode;
/** Current state (hashcode computation). */
State state = hashCodeNotYetComputed;
/**
* Builds a new binary with the given byte array.
*
* @param bytes the wrapped data.
*/
public Binary(byte [] bytes)
{
this._bytes = bytes;
byte [] array = new byte [8];
System.arraycopy(_bytes, 0, array, 0, 8);
_first = unpack64(array);
uuid = UUID.randomUUID();
}
@Override
public int hashCode ()
{
return state.hashCode();
}
@Override
public boolean equals (Object obj)
{
try
{
Binary binary = (Binary)obj;
return Arrays.equals(_bytes, binary._bytes);
} catch (Exception exception)
{
return false;
}
}
/**
* Encodes the content (wrapped byte array) of this instance using the given encoder.
*
* @param encoder the encoder used to encode instance content.
*/
public void encode(Encoder encoder)
{
encoder.writeBin128(_bytes);
}
@Override
public String toString ()
{
return uuid.toString();
}
/**
* Returns the bank identifier derived from this object identifier.
*
* @return the bank identifier derived from this object identifier.
*/
public long getBankId()
{
return _first & 0x000000000FFFFFFF;
}
/**
* Returns the broker identifier derived from this object identifier.
*
* @return the broker identifier derived from this object identifier.
*/
public long getBrokerId()
{
return (_first & 281474708275200L) >> 28;
}
public final long unpack64(byte data[]) {
return (
((long) (data[0] & 0xff) << 56) |
((long)(data[1] & 0xff) << 48) |
((long)(data[2] & 0xff) << 40) |
((long)(data[3] & 0xff) << 32) |
((long)(data[4] & 0xff) << 24) |
((long)(data[5] & 0xff) << 16) |
((long)(data[6] & 0xff) << 8) |
(long) data[7] & 0xff);
}
}
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