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1 /*
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2 * Copyright 2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 /** An interval is an immutable data structure defined by its two
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28 endpoints. */
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29
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30 import java.util.Comparator;
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31
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32 public class Interval {
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33 private Object lowEndpoint;
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34 private Object highEndpoint;
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35
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36 /** It is required that the low endpoint be less than or equal to
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37 the high endpoint according to the Comparator which will be
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38 passed into the overlaps() routines. */
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39 public Interval(Object lowEndpoint, Object highEndpoint) {
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40 this.lowEndpoint = lowEndpoint;
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41 this.highEndpoint = highEndpoint;
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42 }
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43
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44 public Object getLowEndpoint() {
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45 return lowEndpoint;
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46 }
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47
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48 public Object getHighEndpoint() {
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49 return highEndpoint;
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50 }
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51
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52 /** This takes the Interval to compare against as well as a
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53 Comparator which will be applied to the low and high endpoints
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54 of the given intervals. */
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55 public boolean overlaps(Interval arg, Comparator endpointComparator) {
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56 return overlaps(arg.getLowEndpoint(), arg.getHighEndpoint(), endpointComparator);
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57 }
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58
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59 /** Routine which can be used instead of the one taking an interval,
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60 for the situation where the endpoints are being retrieved from
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61 different data structures */
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62 public boolean overlaps(Object otherLowEndpoint,
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63 Object otherHighEndpoint,
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64 Comparator endpointComparator) {
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65 if (endpointComparator.compare(highEndpoint, otherLowEndpoint) <= 0) {
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66 return false;
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67 }
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68 if (endpointComparator.compare(lowEndpoint, otherHighEndpoint) >= 0) {
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69 return false;
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70 }
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71 return true;
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72 }
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73
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74 public String toString() {
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75 return "[ " + getLowEndpoint().toString() + ", " + getHighEndpoint().toString() + ")";
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76 }
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77 }
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