case-study/jdt-before/core refactoring/org/eclipse/jdt/internal/corext/refactoring/typeconstraints2/SubTypeConstraint2.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2011 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.corext.refactoring.typeconstraints2;
  12
  13 import org.eclipse.core.runtime.Assert;
  14
  15 public final class SubTypeConstraint2 implements ITypeConstraint2 {
  16
  17         private final ConstraintVariable2 fAncestor;
  18
  19         private final ConstraintVariable2 fDescendant;
  20
  21         public SubTypeConstraint2(final ConstraintVariable2 descendant, final ConstraintVariable2 ancestor) {
  22                 Assert.isNotNull(descendant);
  23                 Assert.isNotNull(ancestor);
  24                 fDescendant= descendant;
  25                 fAncestor= ancestor;
  26         }
  27
  28         /*
  29          * @see java.lang.Object#equals(java.lang.Object)
  30          */
  31         @Override
  32         public final boolean equals(Object other) {
  33                 // can use object identity on ConstraintVariables, since we have the stored (or to be stored) objects
  34                 if (other.getClass() != SubTypeConstraint2.class)
  35                         return false;
  36
  37                 ITypeConstraint2 otherTC= (ITypeConstraint2) other;
  38                 return fDescendant == otherTC.getLeft() && fAncestor == otherTC.getRight();
  39         }
  40
  41         public final ConstraintVariable2 getLeft() {
  42                 return fDescendant;
  43         }
  44
  45         public final ConstraintVariable2 getRight() {
  46                 return fAncestor;
  47         }
  48
  49         /*
  50          * @see java.lang.Object#hashCode()
  51          */
  52         @Override
  53         public final int hashCode() {
  54                 return fDescendant.hashCode() ^ 37 * fAncestor.hashCode();
  55         }
  56
  57         /*
  58          * @see java.lang.Object#toString()
  59          */
  60         @Override
  61         public final String toString() {
  62                 return fDescendant.toString() + " <= " + fAncestor.toString(); //$NON-NLS-1$
  63         }
  64 }