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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
package com.sun.star.lib.uno.environments.remote;
import com.sun.star.uno.UnoRuntime;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.util.Arrays;
public final class ThreadId {
public static ThreadId createFresh() {
BigInteger c;
synchronized (PREFIX) {
c = count;
count = count.add(BigInteger.ONE);
}
try {
return new ThreadId((PREFIX + c).getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("this cannot happen: " + e);
}
}
public ThreadId(byte[] id) {
this.id = id;
}
/**
* Indicates whether some other object is equal to this one.
*
* @param obj the reference object with which to compare.
* @return <code>true</code> if this object is the same as the obj argument;
* <code>false</code> otherwise.
*
* @see java.lang.Object#equals
*/
@Override
public boolean equals(Object obj) {
return obj instanceof ThreadId
&& Arrays.equals(id, ((ThreadId) obj).id);
}
/**
* Returns a hash code value for the object.
*
* @return a hash code value for this object.
* @see java.lang.Object#hashCode
*/
@Override
public int hashCode() {
int h = hash;
if (h == 0) {
// Same algorithm as java.util.List.hashCode (also see Java 1.5
// java.util.Arrays.hashCode(byte[])):
h = 1;
for (int i = 0; i < id.length; ++i) {
h = 31 * h + id[i];
}
hash = h;
}
return h;
}
/**
* Returns a string representation of the object.
*
* @return a string representation of the object.
* @see java.lang.Object#toString
*/
@Override
public String toString() {
StringBuffer b = new StringBuffer("[ThreadId:");
for (int i = 0; i < id.length; ++i) {
String n = Integer.toHexString(id[i] & 0xFF);
if (n.length() == 1) {
b.append('0');
}
b.append(n);
}
b.append(']');
return b.toString();
}
public byte[] getBytes() {
return id;
}
private static final String PREFIX
= "java:" + UnoRuntime.getUniqueKey() + ":";
private static BigInteger count = BigInteger.ZERO;
private byte[] id;
private int hash = 0;
}
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