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Java example source code file (Interval.java)

This example Java source code file (Interval.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

comparator, interval, object, string, util

The Interval.java Java example source code

/*
 * 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() + ")";
  }
}

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