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annotate graal/com.oracle.max.base/src/com/sun/max/util/Range.java @ 4222:8e2985cdaaa5

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Renaming of VMExits and VMEntries part 3.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 04 Jan 2012 21:13:44 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.util;
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24
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25 /**
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26 * A {@code Range} denotes all the integer values between a {@linkplain #start() start} (inclusive) and
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27 * {@linkplain #end() end} (exclusive) value.
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28 */
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29 public class Range {
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30 private final int start;
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31 private final int end;
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32
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33 public Range(int start) {
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34 this(start, start + 1);
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35 }
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36
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37 /**
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38 * Creates an object representing values in the range {@code [start .. end)}.
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39 *
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40 * @param start
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41 * the lowest value in the range
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42 * @param end
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43 * the value one greater than the highest value in the range
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44 */
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45 public Range(int start, int end) {
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46 assert end >= start;
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47 this.start = start;
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48 this.end = end;
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49 assert length() >= 0;
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50 }
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51
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52 /**
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53 * Gets the lowest value in this range.
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54 * @return
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55 */
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56 public int start() {
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57 return start;
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58 }
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59
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60 /**
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61 * Gets the number of values covered by this range.
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62 */
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63 public long length() {
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64 // This cast and the long return type prevents integer overflow
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65 return ((long) end) - start;
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66 }
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67
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68 /**
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69 * Gets the value one greater than the highest value in this range.
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70 */
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71 public int end() {
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72 return end;
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73 }
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74
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75 public boolean contains(long value) {
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76 return value >= start && value < end;
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77 }
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78
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79 @Override
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80 public String toString() {
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81 return "[" + start() + '-' + (end() - 1) + ']';
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82 }
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83 }