| /* |
| * dk.brics.automaton |
| * |
| * Copyright (c) 2001-2009 Anders Moeller |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.apache.lucene.util.automaton; |
| |
| /** |
| * Pair of states. |
| * |
| * @lucene.experimental |
| */ |
| public class StatePair { |
| int s; |
| int s1; |
| int s2; |
| |
| StatePair(int s, int s1, int s2) { |
| this.s = s; |
| this.s1 = s1; |
| this.s2 = s2; |
| } |
| |
| /** |
| * Constructs a new state pair. |
| * |
| * @param s1 first state |
| * @param s2 second state |
| */ |
| public StatePair(int s1, int s2) { |
| this.s1 = s1; |
| this.s2 = s2; |
| this.s = -1; |
| } |
| |
| /** |
| * Checks for equality. |
| * |
| * @param obj object to compare with |
| * @return true if <tt>obj</tt> represents the same pair of states as this |
| * pair |
| */ |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof StatePair) { |
| StatePair p = (StatePair) obj; |
| return p.s1 == s1 && p.s2 == s2; |
| } else return false; |
| } |
| |
| /** |
| * Returns hash code. |
| * |
| * @return hash code |
| */ |
| @Override |
| public int hashCode() { |
| // Don't use s1 ^ s2 since it's vulnerable to the case where s1 == s2 always --> hashCode = 0, e.g. if you call Operations.sameLanguage, |
| // passing the same automaton against itself: |
| return s1 * 31 + s2; |
| } |
| |
| @Override |
| public String toString() { |
| return "StatePair(s1=" + s1 + " s2=" + s2 + ")"; |
| } |
| } |