| /* |
| * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.utilities; |
| |
| /** An interval is an immutable data structure defined by its two |
| endpoints. */ |
| |
| import java.util.Comparator; |
| |
| public class Interval { |
| private Object lowEndpoint; |
| private Object highEndpoint; |
| |
| /** It is required that the low endpoint be less than or equal to |
| the high endpoint according to the Comparator which will be |
| passed into the overlaps() routines. */ |
| public Interval(Object lowEndpoint, Object highEndpoint) { |
| this.lowEndpoint = lowEndpoint; |
| this.highEndpoint = highEndpoint; |
| } |
| |
| public Object getLowEndpoint() { |
| return lowEndpoint; |
| } |
| |
| public Object getHighEndpoint() { |
| return highEndpoint; |
| } |
| |
| /** This takes the Interval to compare against as well as a |
| Comparator which will be applied to the low and high endpoints |
| of the given intervals. */ |
| public boolean overlaps(Interval arg, Comparator endpointComparator) { |
| return overlaps(arg.getLowEndpoint(), arg.getHighEndpoint(), endpointComparator); |
| } |
| |
| /** Routine which can be used instead of the one taking an interval, |
| for the situation where the endpoints are being retrieved from |
| different data structures */ |
| public boolean overlaps(Object otherLowEndpoint, |
| Object otherHighEndpoint, |
| Comparator endpointComparator) { |
| if (endpointComparator.compare(highEndpoint, otherLowEndpoint) <= 0) { |
| return false; |
| } |
| if (endpointComparator.compare(lowEndpoint, otherHighEndpoint) >= 0) { |
| return false; |
| } |
| return true; |
| } |
| |
| public String toString() { |
| return "[ " + getLowEndpoint().toString() + ", " + getHighEndpoint().toString() + ")"; |
| } |
| } |