001    // --- BEGIN LICENSE BLOCK ---
002    /* 
003     * Copyright (c) 2009, Mikio L. Braun
004     * All rights reserved.
005     * 
006     * Redistribution and use in source and binary forms, with or without
007     * modification, are permitted provided that the following conditions are
008     * met:
009     * 
010     *     * Redistributions of source code must retain the above copyright
011     *       notice, this list of conditions and the following disclaimer.
012     * 
013     *     * Redistributions in binary form must reproduce the above
014     *       copyright notice, this list of conditions and the following
015     *       disclaimer in the documentation and/or other materials provided
016     *       with the distribution.
017     * 
018     *     * Neither the name of the Technische Universit?t Berlin nor the
019     *       names of its contributors may be used to endorse or promote
020     *       products derived from this software without specific prior
021     *       written permission.
022     * 
023     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
024     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
025     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
026     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
027     * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
028     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
029     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
030     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
031     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
032     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
033     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
034     */
035    // --- END LICENSE BLOCK ---
036    
037    /*
038     * To change this template, choose Tools | Templates
039     * and open the template in the editor.
040     */
041    package org.jblas.ranges;
042    
043    /**
044     * Range which varies from a given interval. Endpoint is exclusive!
045     *
046     * "new IntervalRange(0, 3)" enumerates 0, 1, 2.
047     */
048    public class IntervalRange implements Range {
049        private int start;
050        private int end;
051        private int value;
052    
053        /** Construct new interval range. Endpoints are inclusive. */
054        public IntervalRange(int a, int b) {
055            start = a;
056            end = b;
057        }
058    
059        public void init(int lower, int upper) {
060            value = start;
061            if (start < lower || end > upper + 1) {
062                throw new IllegalArgumentException("Bounds " + lower + " to " + upper + " are beyond range interval " + start + " to " + end + ".");
063            }
064        }
065    
066        public int length() {
067            return end - start;
068        }
069    
070        public void next() {
071            value++;
072        }
073        
074        public int index() {
075            return value;
076        }
077        
078        public int value() {
079            return value;
080        }
081    
082        public boolean hasMore() {
083            return value < end;
084        }
085    }