| 1 | package com.hammurapi.extract; |
| 2 | |
| 3 | import java.util.Collections; |
| 4 | import java.util.Map; |
| 5 | import java.util.Set; |
| 6 | import java.util.TreeSet; |
| 7 | import java.util.concurrent.TimeUnit; |
| 8 | |
| 9 | public abstract class ComparisonPredicate<T, V, C> extends ExtractorBase<T, Boolean, C> implements Predicate<T, C>, Mappable<T,Boolean,C>, BinaryExtractor<T,V,C> { |
| 10 | |
| 11 | protected Extractor<T, V, C> leftExtractor; |
| 12 | protected Extractor<T, V, C> rightExtractor; |
| 13 | |
| 14 | protected Set<Integer> parameterIndices = new TreeSet<Integer>(); |
| 15 | |
| 16 | protected enum PromotionLevel { |
| 17 | INT(0), |
| 18 | LONG(1), |
| 19 | FLOAT(2), |
| 20 | DOUBLE(3); |
| 21 | |
| 22 | private PromotionLevel(int level) { |
| 23 | this.level = level; |
| 24 | } |
| 25 | |
| 26 | int level; |
| 27 | } |
| 28 | |
| 29 | protected ComparisonPredicate(double initialCost, TimeUnit costUnit, Extractor<T, V, C> leftExtractor, Extractor<T, V, C> rightExtractor) { |
| 30 | super(initialCost, costUnit); |
| 31 | this.leftExtractor = leftExtractor; |
| 32 | this.rightExtractor = rightExtractor; |
| 33 | parameterIndices.addAll(leftExtractor.parameterIndices()); |
| 34 | parameterIndices.addAll(rightExtractor.parameterIndices()); |
| 35 | } |
| 36 | |
| 37 | public Set<Integer> parameterIndices() { |
| 38 | return Collections.unmodifiableSet(parameterIndices); |
| 39 | } |
| 40 | |
| 41 | protected boolean operandsAreEqual(ComparisonPredicate<T, V, C> other) { |
| 42 | return other.leftExtractor.equals(leftExtractor) && other.rightExtractor.equals(rightExtractor); |
| 43 | } |
| 44 | |
| 45 | protected boolean operandsAreReverseEqual(ComparisonPredicate<T, V, C> other) { |
| 46 | return other.leftExtractor.equals(rightExtractor) && other.rightExtractor.equals(leftExtractor); |
| 47 | } |
| 48 | |
| 49 | @Override |
| 50 | public int hashCode() { |
| 51 | final int prime = 31; |
| 52 | int result = 1; |
| 53 | result = prime * result |
| 54 | + ((leftExtractor == null) ? 0 : leftExtractor.hashCode()); |
| 55 | result = prime |
| 56 | * result |
| 57 | + ((parameterIndices == null) ? 0 : parameterIndices.hashCode()); |
| 58 | result = prime * result |
| 59 | + ((rightExtractor == null) ? 0 : rightExtractor.hashCode()); |
| 60 | return result; |
| 61 | } |
| 62 | |
| 63 | @Override |
| 64 | public boolean equals(Object obj) { |
| 65 | if (this == obj) |
| 66 | return true; |
| 67 | if (obj == null) |
| 68 | return false; |
| 69 | if (getClass() != obj.getClass()) |
| 70 | return false; |
| 71 | @SuppressWarnings("rawtypes") |
| 72 | ComparisonPredicate other = (ComparisonPredicate) obj; |
| 73 | if (leftExtractor == null) { |
| 74 | if (other.leftExtractor != null) |
| 75 | return false; |
| 76 | } else if (!leftExtractor.equals(other.leftExtractor)) |
| 77 | return false; |
| 78 | if (parameterIndices == null) { |
| 79 | if (other.parameterIndices != null) |
| 80 | return false; |
| 81 | } else if (!parameterIndices.equals(other.parameterIndices)) |
| 82 | return false; |
| 83 | if (rightExtractor == null) { |
| 84 | if (other.rightExtractor != null) |
| 85 | return false; |
| 86 | } else if (!rightExtractor.equals(other.rightExtractor)) |
| 87 | return false; |
| 88 | return true; |
| 89 | } |
| 90 | |
| 91 | public boolean isContextDependent() { |
| 92 | return leftExtractor.isContextDependent() || rightExtractor.isContextDependent(); |
| 93 | } |
| 94 | |
| 95 | @Override |
| 96 | public String toString() { |
| 97 | return getClass().getName()+"(cost="+getCost()+", "+leftExtractor+", "+rightExtractor+")"; |
| 98 | } |
| 99 | |
| 100 | @SuppressWarnings("unchecked") |
| 101 | protected Boolean extractInternal( |
| 102 | C context, |
| 103 | Map<C, Map<Extractor<T, ? super Boolean, C>, ? super Boolean>> cache, |
| 104 | T... obj) { |
| 105 | |
| 106 | @SuppressWarnings("rawtypes") |
| 107 | Object o1 = leftExtractor.extract(context, (Map) cache, obj); |
| 108 | @SuppressWarnings("rawtypes") |
| 109 | Object o2 = rightExtractor.extract(context, (Map) cache, obj); |
| 110 | |
| 111 | if (isPromoteable(o1) && isPromoteable(o2)) { |
| 112 | Number n1 = (Number) o1; |
| 113 | Number n2 = (Number) o2; |
| 114 | switch (promote(n1, n2)) { |
| 115 | case INT: |
| 116 | return compare(n1.intValue(), n2.intValue()); |
| 117 | case LONG: |
| 118 | return compare(n1.longValue(), n2.longValue()); |
| 119 | case FLOAT: |
| 120 | return compare(n1.floatValue(), n2.floatValue()); |
| 121 | case DOUBLE: |
| 122 | return compare(n1.doubleValue(), n2.doubleValue()); |
| 123 | default: |
| 124 | throw new IllegalArgumentException("Unexpected promotion level "+promote(n1, n2)); |
| 125 | } |
| 126 | } else { |
| 127 | return compare(o1, o2); |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | private boolean isPromoteable(Object obj) { |
| 132 | return obj instanceof Integer |
| 133 | || obj instanceof Long |
| 134 | || obj instanceof Float |
| 135 | || obj instanceof Double; |
| 136 | } |
| 137 | |
| 138 | protected abstract boolean compare(Object o1, Object o2); |
| 139 | |
| 140 | protected abstract boolean compare(int n1, int n2); |
| 141 | protected abstract boolean compare(long n1, long n2); |
| 142 | protected abstract boolean compare(float n1, float n2); |
| 143 | protected abstract boolean compare(double n1, double n2); |
| 144 | |
| 145 | private PromotionLevel nLevel(Number n) { |
| 146 | if (n instanceof Integer) { |
| 147 | return PromotionLevel.INT; |
| 148 | } |
| 149 | if (n instanceof Long) { |
| 150 | return PromotionLevel.LONG; |
| 151 | } |
| 152 | if (n instanceof Float) { |
| 153 | return PromotionLevel.FLOAT; |
| 154 | } |
| 155 | if (n instanceof Double) { |
| 156 | return PromotionLevel.DOUBLE; |
| 157 | } |
| 158 | throw new IllegalArgumentException(n.getClass()+" is not supported"); |
| 159 | } |
| 160 | |
| 161 | protected PromotionLevel promote(Number n1, Number n2) { |
| 162 | PromotionLevel pl1 = nLevel(n1); |
| 163 | PromotionLevel pl2 = nLevel(n2); |
| 164 | return pl1.level>=pl2.level ? pl1 : pl2; |
| 165 | } |
| 166 | |
| 167 | @Override |
| 168 | public double getCost() { |
| 169 | if (cost==0 && costUnit==null) { |
| 170 | return leftExtractor.getCost()+rightExtractor.getCost(); |
| 171 | } |
| 172 | return super.getCost(); |
| 173 | } |
| 174 | |
| 175 | @Override |
| 176 | public Extractor<T, Boolean, C> map(int[] map) { |
| 177 | Mappable<T, V, C> leftMappable = ExtractorUtil.toMappable(leftExtractor); |
| 178 | if (leftMappable!=null) { |
| 179 | Mappable<T, V, C> rightMappable = ExtractorUtil.toMappable(rightExtractor); |
| 180 | if (rightMappable!=null) { |
| 181 | Extractor<T,V,C> lMapped = leftMappable.map(map); |
| 182 | if (lMapped!=null) { |
| 183 | Extractor<T,V,C> rMapped = rightMappable.map(map); |
| 184 | if (rMapped!=null) { |
| 185 | return newInstance(lMapped, rMapped); |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | } |
| 190 | return null; |
| 191 | } |
| 192 | |
| 193 | protected abstract Extractor<T, Boolean, C> newInstance(Extractor<T, V, C> leftExtractor, Extractor<T, V, C> rightExtractor); |
| 194 | |
| 195 | public Extractor<T, V, C> getLeftExtractor() { |
| 196 | return leftExtractor; |
| 197 | } |
| 198 | |
| 199 | public Extractor<T, V, C> getRightExtractor() { |
| 200 | return rightExtractor; |
| 201 | } |
| 202 | } |