1 | package com.hammurapi.extract; |
2 | |
3 | import java.util.concurrent.TimeUnit; |
4 | |
5 | |
6 | public class Equal<T, V, C> extends ComparisonPredicate<T, V, C> { |
7 | |
8 | private boolean identity; |
9 | |
10 | public Equal( |
11 | double initialCost, |
12 | TimeUnit costUnit, |
13 | Extractor<T, V, C> leftExtractor, |
14 | Extractor<T, V, C> rightExtractor, |
15 | boolean identity) { |
16 | super(initialCost, costUnit, leftExtractor, rightExtractor); |
17 | this.identity = identity; |
18 | } |
19 | |
20 | @Override |
21 | @SuppressWarnings("unchecked") |
22 | public ComparisonResult compareTo(Extractor<T, Boolean, C> otherPredicate) { |
23 | |
24 | if (otherPredicate instanceof Equal) { |
25 | if (equals(otherPredicate) || operandsAreReverseEqual((Equal) otherPredicate)) { |
26 | return ComparisonResult.EQUAL_NM; |
27 | } |
28 | |
29 | ComparisonResult cr = null; |
30 | if (leftExtractor.equals(((ComparisonPredicate) otherPredicate).leftExtractor)) { |
31 | cr = rightExtractor.compareTo(((ComparisonPredicate) otherPredicate).rightExtractor); |
32 | } else if (leftExtractor.equals(((ComparisonPredicate) otherPredicate).rightExtractor)) { |
33 | cr = rightExtractor.compareTo(((ComparisonPredicate) otherPredicate).leftExtractor); |
34 | } else if (rightExtractor.equals(((ComparisonPredicate) otherPredicate).leftExtractor)) { |
35 | cr = leftExtractor.compareTo(((ComparisonPredicate) otherPredicate).rightExtractor); |
36 | } else if (rightExtractor.equals(((ComparisonPredicate) otherPredicate).rightExtractor)) { |
37 | cr = leftExtractor.compareTo(((ComparisonPredicate) otherPredicate).leftExtractor); |
38 | } |
39 | |
40 | if (cr!=null && cr.isOneToOneMapping()) { |
41 | switch (cr.getType()) { |
42 | case UNEQUAL: |
43 | return ComparisonResult.OPPOSITE_LESS_RESTRICTIVE_NM; |
44 | case OPPOSITE: |
45 | return ComparisonResult.OPPOSITE_NM; |
46 | } |
47 | } |
48 | } |
49 | |
50 | if (otherPredicate instanceof NotEqual) { |
51 | NotEqual<T, V, C> op = (NotEqual<T, V, C>) otherPredicate; |
52 | return operandsAreEqual(op) || operandsAreReverseEqual(op) ? ComparisonResult.OPPOSITE_NM : ComparisonResult.NOT_EQUAL_NM; |
53 | } |
54 | |
55 | if (otherPredicate instanceof Not) { |
56 | Not<T, C> op = (Not<T, C>) otherPredicate; |
57 | ComparisonResult cr = compareTo(op.getPredicate()); |
58 | if (cr.isOneToOneMapping()) { |
59 | switch (cr.getType()) { |
60 | case EQUAL: |
61 | return ComparisonResult.OPPOSITE_NM; |
62 | case OPPOSITE: |
63 | return ComparisonResult.EQUAL_NM; |
64 | default: |
65 | return ComparisonResult.NOT_EQUAL_NM; |
66 | } |
67 | } |
68 | /** |
69 | * TODO Implement comparisons. |
70 | * a * b ? c * d, * - can be <, <=, ==, !=, =>, > |
71 | * 36 permutations. Each permutation - compare a/b, c/d |
72 | */ |
73 | |
74 | // TODO Address mappings |
75 | } |
76 | return super.compareTo(otherPredicate); |
77 | } |
78 | |
79 | @Override |
80 | protected boolean compare(int n1, int n2) { |
81 | return n1==n2; |
82 | } |
83 | |
84 | @Override |
85 | protected boolean compare(Object o1, Object o2) { |
86 | if (identity) { |
87 | return o1==o2; |
88 | } |
89 | |
90 | if (o1==null) { |
91 | return o2==null; |
92 | } |
93 | |
94 | return o1.equals(o2); |
95 | } |
96 | |
97 | @Override |
98 | protected boolean compare(long n1, long n2) { |
99 | return n1==n2; |
100 | } |
101 | |
102 | @Override |
103 | protected boolean compare(float n1, float n2) { |
104 | return n1==n2; |
105 | } |
106 | |
107 | @Override |
108 | protected boolean compare(double n1, double n2) { |
109 | return n1==n2; |
110 | } |
111 | |
112 | @Override |
113 | protected Extractor<T, Boolean, C> newInstance(Extractor<T, V, C> leftExtractor, Extractor<T, V, C> rightExtractor) { |
114 | return new Equal<T,V,C>(initialCost, costUnit, leftExtractor, rightExtractor, identity); |
115 | } |
116 | |
117 | public boolean isIdentity() { |
118 | return identity; |
119 | } |
120 | } |