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/*
* Copyright 2004-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code 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. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.vecmath;
/**
* Utility vecmath class used when computing the hash code for vecmath
* objects containing float or double values. This fixes Issue 36.
*/
class VecMathUtil {
/**
* Do not construct an instance of this class.
*/
private VecMathUtil() {}
static final long hashLongBits(long hash, long l) {
hash *= 31L;
return hash + l;
}
static final long hashFloatBits(long hash, float f) {
hash *= 31L;
// Treat 0.0d and -0.0d the same (all zero bits)
if (f == 0.0f)
return hash;
return hash + Float.floatToIntBits(f);
}
static final long hashDoubleBits(long hash, double d) {
hash *= 31L;
// Treat 0.0d and -0.0d the same (all zero bits)
if (d == 0.0d)
return hash;
return hash + Double.doubleToLongBits(d);
}
/**
* Return an integer hash from a long by mixing it with itself.
*/
static final int hashFinish(long hash) {
return (int)(hash ^ (hash >> 32));
}
}
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