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 }