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