| 1 | package de.uka.ipd.sdq.simucomframework.variables.functions; |
| 2 | |
| 3 | import java.util.List; |
| 4 | |
| 5 | import org.apache.log4j.Logger; |
| 6 | |
| 7 | /**Calculates the minimum of a value and given absolute and relative deviations. |
| 8 | * This function has three parameters. The first parameter is the value, the second on the absolute deviation, and the third one the relative deviation. |
| 9 | * @author groenda |
| 10 | */ |
| 11 | public class MinDeviationFunction implements IFunction { |
| 12 | /** Logger for this class. */ |
| 13 | private static final Logger logger = Logger.getLogger(MinDeviationFunction.class); |
| 14 | |
| 15 | /** Name used in the stochastic expression for this function. */ |
| 16 | public static final String MIN_DEVIATION_FUNCTION_NAME = "MinDeviation"; |
| 17 | |
| 18 | /* (non-Javadoc) |
| 19 | * @see de.uka.ipd.sdq.simucomframework.variables.functions.IFunction#checkParameters(java.util.List) |
| 20 | */ |
| 21 | public boolean checkParameters(List<Object> parameters) { |
| 22 | if (parameters.size() != 3) |
| 23 | return false; |
| 24 | if (!(parameterIsNumber(parameters.get(0)) || parameters.get(0) instanceof String)) { |
| 25 | return false; |
| 26 | } |
| 27 | if (!(parameters.get(1) instanceof Double)) { |
| 28 | return false; |
| 29 | } |
| 30 | if (!(parameters.get(2) instanceof Double)) { |
| 31 | return false; |
| 32 | } |
| 33 | return true; |
| 34 | } |
| 35 | |
| 36 | /**Checks if the given parameter is a number. |
| 37 | * Valid numbers are of the types {@link Integer}, {@link Long}, {@link Float}, and {@link Double}. |
| 38 | * @param obj Parameter. |
| 39 | * @return {@code true} if, and only if, the parameter is a number. |
| 40 | */ |
| 41 | private boolean parameterIsNumber(Object obj) { |
| 42 | boolean valid = false; |
| 43 | if (obj instanceof Integer |
| 44 | || obj instanceof Byte |
| 45 | || obj instanceof Character |
| 46 | || obj instanceof Long |
| 47 | || obj instanceof Float |
| 48 | || obj instanceof Double) { |
| 49 | valid = true; |
| 50 | } |
| 51 | return valid; |
| 52 | } |
| 53 | |
| 54 | /* (non-Javadoc) |
| 55 | * @see de.uka.ipd.sdq.simucomframework.variables.functions.IFunction#evaluate(java.util.List) |
| 56 | */ |
| 57 | public Object evaluate(List<Object> parameters) { |
| 58 | Object value = parameters.get(0); |
| 59 | if (value instanceof String) { |
| 60 | logger.debug("String/Enum-based parameter was provided to MinDeviation Function. The parameter will be directly returned."); |
| 61 | return value; |
| 62 | } |
| 63 | Double abs = (Double) parameters.get(1); |
| 64 | Double rel = (Double) parameters.get(2); |
| 65 | if (value instanceof Integer) { |
| 66 | Integer val = (Integer) value; |
| 67 | if (abs > val*rel) { |
| 68 | return Double.valueOf(Math.floor(val - abs)).intValue(); |
| 69 | } else { |
| 70 | return Double.valueOf(Math.floor(val - val * rel)).intValue(); |
| 71 | } |
| 72 | } else if (value instanceof Long) { |
| 73 | Long val = (Long) value; |
| 74 | if (abs > val*rel) { |
| 75 | return Double.valueOf(Math.floor(val - abs)).longValue(); |
| 76 | } else { |
| 77 | return Double.valueOf(Math.floor(val - val * rel)).longValue(); |
| 78 | } |
| 79 | } else if (value instanceof Byte) { |
| 80 | Byte val = (Byte) value; |
| 81 | if (abs > val*rel) { |
| 82 | return Double.valueOf(Math.floor(val - abs)).byteValue(); |
| 83 | } else { |
| 84 | return Double.valueOf(Math.floor(val - val * rel)).byteValue(); |
| 85 | } |
| 86 | } else if (value instanceof Character) { |
| 87 | Character val = (Character) value; |
| 88 | if (abs > val*rel) { |
| 89 | return Double.valueOf(Math.floor(val - abs)).byteValue(); |
| 90 | } else { |
| 91 | return Double.valueOf(Math.floor(val - val * rel)).byteValue(); |
| 92 | } |
| 93 | } else if (value instanceof Float) { |
| 94 | Float val = (Float) value; |
| 95 | if (abs > val*rel) { |
| 96 | return Double.valueOf(Math.floor(val - abs)).floatValue(); |
| 97 | } else { |
| 98 | return Double.valueOf(Math.floor(val - val * rel)).floatValue(); |
| 99 | } |
| 100 | } else if (value instanceof Double) { |
| 101 | Double val = (Double) value; |
| 102 | if (abs > val*rel) { |
| 103 | return Double.valueOf(Math.floor(val - abs)); |
| 104 | } else { |
| 105 | return Double.valueOf(Math.floor(val - val * rel)); |
| 106 | } |
| 107 | } else { |
| 108 | throw new IllegalArgumentException("Unsupported type of value argument experienced."); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | } |