com.ericsson.research.trap.utils.UIDImpl Maven / Gradle / Ivy
package com.ericsson.research.trap.utils;
/*
* ##_BEGIN_LICENSE_##
* Transport Abstraction Package (trap)
* ----------
* Copyright (C) 2014 Ericsson AB
* ----------
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the Ericsson AB nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* ##_END_LICENSE_##
*/
import java.util.concurrent.atomic.AtomicInteger;
public class UIDImpl extends UID
{
AtomicInteger suffixGen = new AtomicInteger();
@Override
protected String doRandomUID()
{
double random = Math.random();
String prefix = Double.toHexString(random).substring(4);
prefix = prefix.substring(0, Math.min(prefix.length()-2, 8));
String suffix = Integer.toHexString(suffixGen.incrementAndGet());
StringBuilder out = new StringBuilder();
int pos = (int) (Math.random() * (prefix.length()+1));
if (pos > 0)
out.append(prefix.substring(0, pos));
out.append(suffix);
if (pos < prefix.length())
out.append(prefix.substring(pos, prefix.length()));
return out.toString();
}
}