com.mchange.v1.db.sql.schemarep.TypeRepIdenticator Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v1.db.sql.schemarep;
import java.util.Arrays;
import com.mchange.v1.identicator.Identicator;
public class TypeRepIdenticator implements Identicator
{
private final static TypeRepIdenticator INSTANCE = new TypeRepIdenticator();
public static TypeRepIdenticator getInstance()
{ return INSTANCE; }
private TypeRepIdenticator()
{}
public boolean identical(Object a, Object b)
{
if (a == b)
return true;
TypeRep aa = (TypeRep) a;
TypeRep bb = (TypeRep) b;
return
aa.getTypeCode() == bb.getTypeCode() &&
Arrays.equals( aa.getTypeSize(), bb.getTypeSize() );
}
public int hash(Object o)
{
TypeRep tr = (TypeRep) o;
int out = tr.getTypeCode();
int[] szArray = tr.getTypeSize();
if (szArray != null)
{
int len = szArray.length;
for (int i = 0; i < len; ++i)
out ^= szArray[i];
out ^= len;
}
return out;
}
}