com.sun.electric.tool.util.concurrent.utils.BlockedRange1D Maven / Gradle / Ivy
/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: BlockedRange1D.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 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.tool.util.concurrent.utils;
import java.util.List;
/**
*
* 1 dimensional block range. Use this range for 1 dimensional for loops
*
* @author Felix Schmidt
*
*/
public class BlockedRange1D extends BlockedRange {
private Range range;
private Integer current = null;
public BlockedRange1D(int start, int end, int step) {
this.range = new Range(start, end, step);
}
public int start() {
return range.start();
}
public int end() {
return range.end();
}
public int step() {
return range.step();
}
/**
* split the current block range into smaller pieces according to step
* width
*/
public List splitBlockedRange(int step) {
if (current != null && current >= range.end())
return null;
List result = ConcurrentCollectionFactory.createArrayList();
for (int i = 0; i < step; i++) {
if (current == null)
current = range.start();
if (current >= range.end())
return result;
result.add(new BlockedRange1D(current, Math.min(current + range.step(), this.range.end()),
range.step()));
current += range.step();
}
return result;
}
/*
* (non-Javadoc)
*
* @see
* com.sun.electric.tool.util.concurrent.patterns.PForJob.BlockedRange
* #createInstance(int, int)
*/
public BlockedRange1D createInstance(int number, int total) {
int size = this.range.end() - this.range.start();
int split = size / total;
BlockedRange1D result = new BlockedRange1D(number * split,
(number + 1 == total) ? this.range.end() : (number + 1) * split, this.range.step());
return result;
}
}