org.faktorips.runtime.formula

Class AbstractFormulaEvaluator

java.lang.Object

org.faktorips.runtime.formula.AbstractFormulaEvaluator

All Implemented Interfaces:

IFormulaEvaluator

public abstract class AbstractFormulaEvaluator
extends Object
implements IFormulaEvaluator

An abstract implementation of IFormulaEvaluator holding the product component generation or product component and handles the exceptions thrown by the evaluateInternal(String, Object...) method.

There is no method to set the compiled formula expression because the expressions have to be set by the IFormulaEvaluatorFactory while creating the evaluator.

Author:

dirmeier

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMPILED_EXPRESSION_XML_TAG

Constructor Summary

Constructors

Constructor and Description
AbstractFormulaEvaluator(Object object, Map<String,String> nameToExpressionMap)

Method Summary

Modifier and Type	Method and Description
Object	evaluate(String formularName, Object... parameters) Evaluates a formula that was added through the builder
protected abstract Object	evaluateInternal(String formularName, Object... parameters) This method evaluates the formula with the given name and the specified parameters.
Map<String,String>	getNameToExpressionMap() Returns a defensive copy of the map of expressions/formulas held by this evaluator.
Object	getObject() Returns the product component generation or product component this is an evaluator for.

Methods inherited from class java.lang.Object

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

Field Detail

COMPILED_EXPRESSION_XML_TAG

public static final String COMPILED_EXPRESSION_XML_TAG

See Also:

Constant Field Values

Constructor Detail

AbstractFormulaEvaluator

public AbstractFormulaEvaluator(Object object,
                                Map<String,String> nameToExpressionMap)

Method Detail

getObject

public Object getObject()

Description copied from interface: IFormulaEvaluator

Returns the product component generation or product component this is an evaluator for.

Specified by:

getObject in interface IFormulaEvaluator

evaluate

public Object evaluate(String formularName,
                       Object... parameters)

Evaluates a formula that was added through the builder

Specified by:

evaluate in interface IFormulaEvaluator

Parameters:

formularName - The name of the formula to evaluate

parameters - the parameters the formula requires when being evaluated

Returns:

the result of the evaluated formula

Throws:

IllegalArgumentException - if the formula signature is unknown

evaluateInternal

protected abstract Object evaluateInternal(String formularName,
                                           Object... parameters)
                                    throws Exception

This method evaluates the formula with the given name and the specified parameters. With the name and parameters you have the complete formula method signature. The order of the parameters is given by the formula signature.

Parameters:

formularName - name of the formula to evaluate

parameters - the parameters to evaluate the formula

Returns:

the return value of the evaluated formula

Throws:

Exception

getNameToExpressionMap

public Map<String,String> getNameToExpressionMap()

Returns a defensive copy of the map of expressions/formulas held by this evaluator.

Specified by:

getNameToExpressionMap in interface IFormulaEvaluator

Returns:

a map containing the expressions (with their names as keys) held by this formula evaluator