| /******************************************************************************* |
| * Copyright (C) 2007 The University of Manchester |
| * |
| * Modifications to the initial code base are copyright of their |
| * respective authors, or their employers as appropriate. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public License |
| * as published by the Free Software Foundation; either version 2.1 of |
| * the License, or (at your option) any later version. |
| * |
| * This program 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| ******************************************************************************/ |
| package net.sf.taverna.t2.workflowmodel; |
| |
| /** |
| * A simple generic class to hold a pair of same type objects. Used by various |
| * Edit implementations that operate on pairs of Processors amongst other |
| * things. |
| * |
| * @author Tom Oinn |
| * |
| * @param <T> |
| * Type of the pair of contained objects |
| */ |
| public class OrderedPair<T> { |
| |
| private T a, b; |
| |
| /** |
| * Build a new ordered pair with the specified objects. |
| * |
| * @throws RuntimeException |
| * if either a or b are null |
| * @param a |
| * @param b |
| */ |
| public OrderedPair(T a, T b) { |
| if (a == null || b == null) { |
| throw new RuntimeException( |
| "Cannot construct ordered pair with null arguments"); |
| } |
| this.a = a; |
| this.b = b; |
| } |
| |
| /** |
| * Return object a |
| */ |
| public T getA() { |
| return this.a; |
| } |
| |
| /** |
| * Return object b |
| */ |
| public T getB() { |
| return this.b; |
| } |
| |
| /** |
| * A pair of objects (a,b) is equal to another pair (c,d) if and only if a, |
| * b, c and d are all the same type and the condition (a.equals(c) & |
| * b.equals(d)) is true. |
| */ |
| @Override |
| public boolean equals(Object other) { |
| if (other instanceof OrderedPair) { |
| OrderedPair<?> op = (OrderedPair<?>) other; |
| return (a.equals(op.getA()) && b.equals(op.getB())); |
| } else { |
| return false; |
| } |
| } |
| |
| } |