| 1 | package de.uka.ipd.sdq.stoex.analyser.operations; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.List; |
| 5 | |
| 6 | import de.uka.ipd.sdq.probfunction.math.IProbabilityFunctionFactory; |
| 7 | import de.uka.ipd.sdq.probfunction.math.IProbabilityMassFunction; |
| 8 | import de.uka.ipd.sdq.probfunction.math.ISample; |
| 9 | import de.uka.ipd.sdq.probfunction.math.IUnit; |
| 10 | |
| 11 | /** |
| 12 | * Abstract class with interface for logical operations (AND, OR). |
| 13 | * |
| 14 | * @author brosch |
| 15 | * |
| 16 | */ |
| 17 | public abstract class LogicalOperation { |
| 18 | |
| 19 | /** |
| 20 | * String constant for FALSE value. |
| 21 | */ |
| 22 | private static final Object FALSE_STRING = "false"; |
| 23 | |
| 24 | /** |
| 25 | * String constant for TRUE value. |
| 26 | */ |
| 27 | private static final Object TRUE_STRING = "true"; |
| 28 | |
| 29 | /** |
| 30 | * Evaluates two objects that represent the left-hand side and the |
| 31 | * right-hand side of a logical expression. |
| 32 | * |
| 33 | * @param left |
| 34 | * left-hand side of expression |
| 35 | * @param right |
| 36 | * right-hand side of expression |
| 37 | * @return evaluation result |
| 38 | */ |
| 39 | public IProbabilityMassFunction evaluate(Object left, Object right) { |
| 40 | |
| 41 | // Assure proper handling of boolean values: |
| 42 | if (left instanceof String) { |
| 43 | if (((String) left).toLowerCase().equals(TRUE_STRING)) { |
| 44 | left = new Boolean(true); |
| 45 | } else if (((String) left).toLowerCase().equals(FALSE_STRING)) { |
| 46 | left = new Boolean(false); |
| 47 | } |
| 48 | } |
| 49 | if (right instanceof String) { |
| 50 | if (((String) right).toLowerCase().equals(TRUE_STRING)) { |
| 51 | right = new Boolean(true); |
| 52 | } else if (((String) right).toLowerCase().equals(FALSE_STRING)) { |
| 53 | right = new Boolean(false); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | // Propagate to the type-dependent handling: |
| 58 | if ((left instanceof IProbabilityMassFunction) |
| 59 | && (right instanceof IProbabilityMassFunction)) { |
| 60 | return getEvaluatedPMF((IProbabilityMassFunction) left, |
| 61 | (IProbabilityMassFunction) right); |
| 62 | } |
| 63 | if ((left instanceof Boolean) |
| 64 | && (right instanceof IProbabilityMassFunction)) { |
| 65 | return getEvaluatedPMF((Boolean) left, |
| 66 | (IProbabilityMassFunction) right); |
| 67 | } |
| 68 | if ((left instanceof IProbabilityMassFunction) |
| 69 | && (right instanceof Boolean)) { |
| 70 | return getEvaluatedPMF((IProbabilityMassFunction) left, |
| 71 | (Boolean) right); |
| 72 | } |
| 73 | if ((left instanceof Boolean) && (right instanceof Boolean)) { |
| 74 | return getEvaluatedPMF((Boolean) left, (Boolean) right); |
| 75 | } |
| 76 | |
| 77 | // Type not supported: |
| 78 | throw new UnsupportedOperationException(); |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Retrieves the probability of the given boolean value from the given |
| 83 | * Boolean PMF. |
| 84 | * |
| 85 | * @param left |
| 86 | * @return |
| 87 | */ |
| 88 | protected double findBooleanProbability( |
| 89 | final IProbabilityMassFunction left, final boolean value) { |
| 90 | |
| 91 | // Search for the sample that represents the TRUE value: |
| 92 | for (ISample leftSamplingPoint : left.getSamples()) { |
| 93 | if (!(leftSamplingPoint.getValue() instanceof String)) { |
| 94 | // Found non-boolean sample: |
| 95 | throw new UnsupportedOperationException(); |
| 96 | } |
| 97 | if (((String) leftSamplingPoint.getValue()).toUpperCase().equals( |
| 98 | Boolean.toString(value).toUpperCase())) { |
| 99 | return leftSamplingPoint.getProbability(); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | // Did not find a sample for the requested boolean value: |
| 104 | throw new UnsupportedOperationException(); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Converts a boolean value to a boolean PMF. |
| 109 | * |
| 110 | * @param value |
| 111 | * @return |
| 112 | */ |
| 113 | protected IProbabilityMassFunction getBoolPMF(boolean value) { |
| 114 | return (value) ? getBoolPMF(1.0) : getBoolPMF(0.0); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Converts a probability into a boolean PMF. |
| 119 | * |
| 120 | * @param left |
| 121 | * @param right |
| 122 | * @return |
| 123 | */ |
| 124 | protected IProbabilityMassFunction getBoolPMF(double trueProb) { |
| 125 | IProbabilityFunctionFactory probFac = IProbabilityFunctionFactory.eINSTANCE; |
| 126 | |
| 127 | IUnit unit = probFac.createUnit("bool"); |
| 128 | |
| 129 | List<ISample> sampleList = new ArrayList<ISample>(); |
| 130 | sampleList.add(probFac.createSample(TRUE_STRING, trueProb)); |
| 131 | sampleList.add(probFac.createSample(FALSE_STRING, 1 - trueProb)); |
| 132 | |
| 133 | IProbabilityMassFunction boolPMF = probFac |
| 134 | .createProbabilityMassFunction(sampleList, unit, true); |
| 135 | |
| 136 | return boolPMF; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Evaluates two boolean values. |
| 141 | */ |
| 142 | protected IProbabilityMassFunction getEvaluatedPMF(Boolean left, |
| 143 | Boolean right) { |
| 144 | return getBoolPMF(new Boolean(left && right)); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Evaluates a boolean value and a PMF. |
| 149 | */ |
| 150 | protected IProbabilityMassFunction getEvaluatedPMF(Boolean left, |
| 151 | IProbabilityMassFunction right) { |
| 152 | return getEvaluatedPMF(getBoolPMF(left), right); |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Evaluates a boolean value and a PMF. |
| 157 | */ |
| 158 | protected IProbabilityMassFunction getEvaluatedPMF( |
| 159 | IProbabilityMassFunction left, Boolean right) { |
| 160 | return getEvaluatedPMF(left, getBoolPMF(right)); |
| 161 | } |
| 162 | |
| 163 | protected abstract IProbabilityMassFunction getEvaluatedPMF( |
| 164 | IProbabilityMassFunction left, IProbabilityMassFunction right); |
| 165 | } |