/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: MinMaxOperation.java
*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.database.geometry.btree.unboxed;
import java.io.*;
/**
* An associative operation on unboxed values.
*
* http://en.wikipedia.org/wiki/Monoid
* http://en.wikipedia.org/wiki/Semigroup
*/
public class MinMaxOperation<K extends Serializable, V extends Serializable & Comparable>
extends
UnboxedPair< Pair<K,V> , Pair<K,V> >
implements
Serializable,
AssociativeOperation< Pair< Pair<K,V> , Pair<K,V> > >,
AssociativeCommutativeOperation< Pair< Pair<K,V> , Pair<K,V> > >,
UnboxedFunction< Pair<K,V> , Pair< Pair<K,V> , Pair<K,V> > > {
private final Unboxed<K> uk;
private final UnboxedComparable<V> uv;
public MinMaxOperation(Unboxed<K> uk, UnboxedComparable<V> uv) {
super( new UnboxedPair(uk, uv),
new UnboxedPair(uk, uv) );
this.uk = uk;
this.uv = uv;
}
public void call(byte[] buf_arg, int ofs_arg,
byte[] buf_result, int ofs_result) {
System.arraycopy(buf_arg, ofs_arg, buf_result,
ofs_result, uk.getSize()+uv.getSize());
System.arraycopy(buf_arg, ofs_arg, buf_result,
ofs_result+uk.getSize()+uv.getSize(), uk.getSize()+uv.getSize());
}
public void multiply(byte[] buf1, int ofs1,
byte[] buf2, int ofs2,
byte[] buf_dest, int ofs_dest) {
int compareMin = uv.compare(buf1, ofs1+uk.getSize(), buf2, ofs2+uk.getSize());
int compareMax = uv.compare(buf1, ofs1+2*uk.getSize()+uv.getSize(), buf2, ofs2+2*uk.getSize()+uv.getSize());
System.arraycopy(compareMin<0 ? buf1 : buf2,
compareMin<0 ? ofs1 : ofs2,
buf_dest,
ofs_dest,
uk.getSize()+uv.getSize());
System.arraycopy(compareMax>=0 ? buf1 : buf2,
(compareMax>=0 ? ofs1 : ofs2)+uk.getSize()+uv.getSize(),
buf_dest,
ofs_dest+uk.getSize()+uv.getSize(),
uk.getSize()+uv.getSize());
}
}