| 1 | /* |
| 2 | * JTiger Unit Testing Framework for J2SE 1.5 |
| 3 | * Copyright (C) 2005 Tony Morris |
| 4 | * |
| 5 | * This software is licenced under the |
| 6 | * Common Public Licence version 1.0 |
| 7 | * http://www.opensource.org/licenses/cpl1.0.php |
| 8 | * |
| 9 | * You received a copy of this licence with this software. |
| 10 | */ |
| 11 | package org.jtiger.assertion; |
| 12 | |
| 13 | import java.lang.reflect.Method; |
| 14 | import java.lang.reflect.InvocationTargetException; |
| 15 | |
| 16 | final class ComparableTesterFactory |
| 17 | { |
| 18 | private static final String COMPARE_TO = "compareTo"; |
| 19 | |
| 20 | private ComparableTesterFactory() |
| 21 | { |
| 22 | |
| 23 | } |
| 24 | |
| 25 | public static ComparableTester newComparableTester(final ObjectFactory<? extends java.lang.Comparable> factory) throws NullPointerException |
| 26 | { |
| 27 | if(factory == null) |
| 28 | { |
| 29 | throw new NullPointerException(); |
| 30 | } |
| 31 | |
| 32 | return new ComparableTesterImpl(factory); |
| 33 | } |
| 34 | |
| 35 | private static final class ComparableTesterImpl implements ComparableTester |
| 36 | { |
| 37 | private static Method compareTo; |
| 38 | |
| 39 | static |
| 40 | { |
| 41 | try |
| 42 | { |
| 43 | compareTo = java.lang.Comparable.class.getMethod(ComparableTesterFactory.COMPARE_TO, Object.class); |
| 44 | |
| 45 | if(!compareTo.isAccessible()) |
| 46 | { |
| 47 | compareTo.setAccessible(true); |
| 48 | } |
| 49 | } |
| 50 | catch(NoSuchMethodException e) |
| 51 | { |
| 52 | throw new AssertionException(e.getMessage(), e); |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | private final ObjectFactory<? extends java.lang.Comparable> factory; |
| 57 | |
| 58 | ComparableTesterImpl(final ObjectFactory<? extends java.lang.Comparable> factory) |
| 59 | { |
| 60 | this.factory = factory; |
| 61 | } |
| 62 | |
| 63 | public boolean equalComparesToZero() throws AssertionException |
| 64 | { |
| 65 | final java.lang.Comparable<?> x = factory.newInstanceX(); |
| 66 | final java.lang.Comparable<?> y = factory.newInstanceY(); |
| 67 | |
| 68 | try |
| 69 | { |
| 70 | return ((Integer)compareTo.invoke(x, x)) == 0 && ((Integer)compareTo.invoke(y, y)) == 0; |
| 71 | } |
| 72 | catch(IllegalAccessException e) |
| 73 | { |
| 74 | throw new AssertionException(e.getMessage(), e); |
| 75 | } |
| 76 | catch(InvocationTargetException e) |
| 77 | { |
| 78 | throw new AssertionException(e.getMessage(), e); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | public boolean notEqualNotComparesToZero() throws AssertionException |
| 83 | { |
| 84 | final java.lang.Comparable<?> x = factory.newInstanceX(); |
| 85 | final java.lang.Comparable<?> y = factory.newInstanceY(); |
| 86 | |
| 87 | try |
| 88 | { |
| 89 | return ((Integer)compareTo.invoke(x, y)) != 0 && ((Integer)compareTo.invoke(y, x)) != 0; |
| 90 | } |
| 91 | catch(IllegalAccessException e) |
| 92 | { |
| 93 | throw new AssertionException(e.getMessage(), e); |
| 94 | } |
| 95 | catch(InvocationTargetException e) |
| 96 | { |
| 97 | throw new AssertionException(e.getMessage(), e); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | } |