Package nz.org.riskscape.engine

Class DefaultFunctionResolver

java.lang.Object

nz.org.riskscape.engine.DefaultFunctionResolver

All Implemented Interfaces:

nz.org.riskscape.engine.function.FunctionResolver

public class DefaultFunctionResolver
extends Object
implements nz.org.riskscape.engine.function.FunctionResolver

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DefaultFunctionResolver.SetPair

Constructor Summary

Constructors

Constructor	Description
DefaultFunctionResolver()

Method Summary

Modifier and Type	Method	Description
static <T> T	evaluateConstant(nz.org.riskscape.engine.rl.RealizationContext context, nz.org.riskscape.rl.ast.FunctionCall functionCall, int argIndex, Class<T> requiredJavaType, nz.org.riskscape.engine.types.Type requiredType)	Helper method for a RealizableFunction to extract a constant from the arguments with various error handling along the way.
nz.org.riskscape.problem.ResultOrProblems<nz.org.riskscape.engine.function.RiskscapeFunction>	resolve(nz.org.riskscape.engine.rl.RealizationContext context, nz.org.riskscape.rl.ast.FunctionCall functionCall, nz.org.riskscape.engine.types.Type inputType, List<nz.org.riskscape.engine.types.Type> argumentTypes, nz.org.riskscape.engine.function.IdentifiedFunction function)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DefaultFunctionResolver

public DefaultFunctionResolver()

Method Details

evaluateConstant

public static <T> T evaluateConstant(nz.org.riskscape.engine.rl.RealizationContext context,
 nz.org.riskscape.rl.ast.FunctionCall functionCall,
 int argIndex,
 Class<T> requiredJavaType,
 nz.org.riskscape.engine.types.Type requiredType)
                              throws nz.org.riskscape.problem.ProblemException

Helper method for a RealizableFunction to extract a constant from the arguments with various error handling along the way. This method will fail if the expression is not a constant expression (e.g. it depends on values extracted from scope).

Type Parameters:

T -

Parameters:

context - context in which realization is happening - typically the argument that was passed to RealizableFunction.realize(RealizationContext, FunctionCall, List)

functionCall - the functionCall expression that contains an argument to be realized constantly

argIndex - the index of the argument (0 based) that should be a constant

requiredJavaType - the desired java type of the constant - must map to a built-in riskscape type via Types.fromJavaType(Class)

requiredType - the Riskscape version of the requiredJavaType argument. Is only used for a problem and no riskscape type checking is actually done against this type.

Returns:

the constant value from the function call expression

Throws:

nz.org.riskscape.problem.ProblemException - if the expression was bad, not a constant, or of the wrong type. Contained problem should be suitable for display to the user without wrapping with more function-call specific context

resolve

public nz.org.riskscape.problem.ResultOrProblems<nz.org.riskscape.engine.function.RiskscapeFunction> resolve(nz.org.riskscape.engine.rl.RealizationContext context,
 nz.org.riskscape.rl.ast.FunctionCall functionCall,
 nz.org.riskscape.engine.types.Type inputType,
 List<nz.org.riskscape.engine.types.Type> argumentTypes,
 nz.org.riskscape.engine.function.IdentifiedFunction function)

Specified by:

resolve in interface nz.org.riskscape.engine.function.FunctionResolver