| 1 | package de.uka.ipd.sdq.simucomframework.variables.functions; |
| 2 | |
| 3 | import java.util.List; |
| 4 | |
| 5 | import org.apache.log4j.Logger; |
| 6 | |
| 7 | /**Implements the minimum function as in @link{@link Math}, e.g. {@link Math#min(double, double)}. |
| 8 | * @author groenda |
| 9 | */ |
| 10 | public class MinFunction implements IFunction { |
| 11 | /** Logger for this class. */ |
| 12 | private static final Logger logger = Logger.getLogger(MinFunction.class); |
| 13 | |
| 14 | /** Name used in the stochastic expression for this function. */ |
| 15 | public static final String MIN_FUNCTION_NAME = "Min"; |
| 16 | |
| 17 | /* (non-Javadoc) |
| 18 | * @see de.uka.ipd.sdq.simucomframework.variables.functions.IFunction#checkParameters(java.util.List) |
| 19 | */ |
| 20 | public boolean checkParameters(List<Object> parameters) { |
| 21 | if (parameters.size() != 2) |
| 22 | return false; |
| 23 | boolean valid = false; |
| 24 | valid = parameterIsNumber(parameters.get(0)) || parameters.get(0) instanceof String; |
| 25 | valid &= parameterIsNumber(parameters.get(1)); |
| 26 | valid &= parameters.get(0).getClass().isInstance(parameters.get(1)); |
| 27 | return valid; |
| 28 | } |
| 29 | |
| 30 | /**Checks if the given parameter is a number. |
| 31 | * Valid numbers are of the types {@link Integer}, {@link Long}, {@link Float}, and {@link Double}. |
| 32 | * @param obj Parameter. |
| 33 | * @return {@code true} if, and only if, the parameter is a number. |
| 34 | */ |
| 35 | private boolean parameterIsNumber(Object obj) { |
| 36 | boolean valid = false; |
| 37 | if (obj instanceof Integer |
| 38 | || obj instanceof Long |
| 39 | || obj instanceof Float |
| 40 | || obj instanceof Double) { |
| 41 | valid = true; |
| 42 | } |
| 43 | return valid; |
| 44 | } |
| 45 | |
| 46 | /* (non-Javadoc) |
| 47 | * @see de.uka.ipd.sdq.simucomframework.variables.functions.IFunction#evaluate(java.util.List) |
| 48 | */ |
| 49 | public Object evaluate(List<Object> parameters) { |
| 50 | if (parameters.get(0) instanceof Double || parameters.get(1) instanceof Double) { |
| 51 | return Math.min((Double) parameters.get(0), (Double) parameters.get(1)); |
| 52 | } else if (parameters.get(0) instanceof Long || parameters.get(1) instanceof Long) { |
| 53 | return Math.min((Long) parameters.get(0), (Long) parameters.get(1)); |
| 54 | } else if (parameters.get(0) instanceof Integer || parameters.get(1) instanceof Integer) { |
| 55 | return Math.min((Integer) parameters.get(0), (Integer) parameters.get(1)); |
| 56 | } else if (parameters.get(0) instanceof Float || parameters.get(1) instanceof Float) { |
| 57 | return Math.min((Float) parameters.get(0), (Float) parameters.get(1)); |
| 58 | } else if (parameters.get(0) instanceof String) { |
| 59 | logger.debug("String/Enum-based parameter was provided to Min function. The parameter will be returned directly."); |
| 60 | return parameters.get(0); |
| 61 | } else { |
| 62 | throw new IllegalArgumentException("Both parameters must have the same type and have one of the type Integer, Long, Float, or Double."); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | } |