| 1 | package de.uka.ipd.sdq.simucomframework.variables.functions; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.HashMap; |
| 5 | |
| 6 | import de.uka.ipd.sdq.probfunction.math.IPDFFactory; |
| 7 | import de.uka.ipd.sdq.probfunction.math.IRandomGenerator; |
| 8 | |
| 9 | import de.uka.ipd.sdq.simucomframework.variables.exceptions.FunctionParametersNotAcceptedException; |
| 10 | import de.uka.ipd.sdq.simucomframework.variables.exceptions.FunctionUnknownException; |
| 11 | import de.uka.ipd.sdq.stoex.analyser.probfunction.ProbfunctionHelper; |
| 12 | |
| 13 | /** |
| 14 | * Function library of functions available in stoex in simucom |
| 15 | * @author Steffen Becker |
| 16 | * |
| 17 | */ |
| 18 | public class FunctionLib { |
| 19 | |
| 20 | private HashMap<String, IFunction> myFunctions = new HashMap<String, IFunction>(); |
| 21 | private IRandomGenerator randomStream; |
| 22 | |
| 23 | /** |
| 24 | * Initialise the function library. |
| 25 | * |
| 26 | */ |
| 27 | public FunctionLib(IRandomGenerator randomStream, IPDFFactory factory) { |
| 28 | this.randomStream = randomStream; |
| 29 | addStdFunctionsToLib(randomStream, factory); |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * Add the functions available in simucoms standard library |
| 34 | */ |
| 35 | private void addStdFunctionsToLib(IRandomGenerator randomGen, IPDFFactory factory) { |
| 36 | myFunctions.put("Norm",new NormDistFunction(randomGen, factory)); |
| 37 | myFunctions.put("Exp",new ExpDistFunction(randomGen, factory)); |
| 38 | myFunctions.put("Pois",new PoissonDistFunction(randomGen, factory)); |
| 39 | myFunctions.put("UniDouble",new UniDoubleDistFunction(randomGen, factory)); |
| 40 | myFunctions.put("UniInt",new UniIntDistFunction(randomGen, factory)); |
| 41 | myFunctions.put("Trunc",new TruncFunction()); |
| 42 | myFunctions.put(RoundFunction.ROUND_FUNCTION_NAME,new RoundFunction()); |
| 43 | myFunctions.put(ProbfunctionHelper.LOGNORM,new LogNormDistFunction(randomGen, factory)); |
| 44 | myFunctions.put(ProbfunctionHelper.LOGNORM2,new LogNormDistFunctionFromMoments(randomGen, factory)); |
| 45 | myFunctions.put(ProbfunctionHelper.GAMMA,new GammaDistFunction(randomGen, factory)); |
| 46 | myFunctions.put(ProbfunctionHelper.GAMMA2,new GammaDistFunctionFromMoments(randomGen, factory)); |
| 47 | myFunctions.put(MinFunction.MIN_FUNCTION_NAME, new MinFunction()); |
| 48 | myFunctions.put(MaxFunction.MAX_FUNCTION_NAME, new MaxFunction()); |
| 49 | myFunctions.put(MinDeviationFunction.MIN_DEVIATION_FUNCTION_NAME, new MinDeviationFunction()); |
| 50 | myFunctions.put(MaxDeviationFunction.MAX_DEVIATION_FUNCTION_NAME, new MaxDeviationFunction()); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Add a function to this function library. |
| 55 | * The passed function should use the instance of |
| 56 | * SimuComDefaultRandomNumberGenerator returned by |
| 57 | * {@link #getRandomStream()}. |
| 58 | * |
| 59 | * @param id Name of the function to add. It is the ID in the stoex |
| 60 | * @param f The function object used during evaluation |
| 61 | */ |
| 62 | public void addFunction(String id, IFunction f) { |
| 63 | myFunctions.put(id, f); |
| 64 | } |
| 65 | |
| 66 | public IRandomGenerator getRandomStream(){ |
| 67 | return randomStream; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Evaluate the function with the given ID using the given parameters, |
| 72 | * e.g. f(10,29) |
| 73 | * @param functionID ID of the function to evaluate |
| 74 | * @param parameterValues Parameter set to use in evaluation |
| 75 | * @return Value of the function evaluated using the given parameters |
| 76 | */ |
| 77 | public Object evaluate(String functionID, ArrayList<Object> parameterValues) { |
| 78 | if (!myFunctions.containsKey(functionID)) |
| 79 | throw new FunctionUnknownException("Function "+functionID+" is unknown! Evaluation aborted"); |
| 80 | IFunction f = myFunctions.get(functionID); |
| 81 | if (!f.checkParameters(parameterValues)) |
| 82 | throw new FunctionParametersNotAcceptedException("Parameters passed to function "+functionID+" do not match function definition!"); |
| 83 | return f.evaluate(parameterValues); |
| 84 | } |
| 85 | } |