Package org.faktorips.fl

Class ExprEvaluator

java.lang.Object

org.faktorips.fl.ExprEvaluator

public class ExprEvaluator
extends Object

Evaluates a given expression and returns it's result.

Technically this is done by first compiling the expression to Java source code using the JavaExprCompiler. After that a java bean-shell} interpreter interprets the expression and the result is returned by the evaluate method of this class.

Author:

Jan Ortmann

Constructor Summary

Constructors

Constructor	Description
ExprEvaluator(JavaExprCompiler compiler)	Constructs a new processor for the given compiler.
ExprEvaluator(JavaExprCompiler compiler, ClassLoader classLoader)	Constructs a new processor for the given compiler and class loader.

Method Summary

Modifier and Type	Method	Description
Object	evaluate(String expression)	Evaluates and returns the result of the given expression.
Object	evaluate(String expression, String[] variables, Object[] variableValues)	Evaluates and returns the result of the given expression.
Object	evaluate(org.faktorips.codegen.JavaCodeFragment javaCodeFragment)	Evaluates and returns the result of the given java code fragment.

Methods inherited from class java.lang.Object

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

Constructor Details

ExprEvaluator

public ExprEvaluator(JavaExprCompiler compiler)

Constructs a new processor for the given compiler.

ExprEvaluator

public ExprEvaluator(JavaExprCompiler compiler,
 ClassLoader classLoader)

Constructs a new processor for the given compiler and class loader.

Method Details

evaluate

public Object evaluate(String expression)
                throws Exception

Evaluates and returns the result of the given expression.

Throws:

Exception

evaluate

public Object evaluate(String expression,
 String[] variables,
 Object[] variableValues)
                throws Exception

Evaluates and returns the result of the given expression. If the expression contains any variables the variables can be specified with the variables parameter and the values of the variables can be specified by means of the variableValues parameter.

Throws:

Exception

evaluate

public Object evaluate(org.faktorips.codegen.JavaCodeFragment javaCodeFragment)
                throws Exception

Evaluates and returns the result of the given java code fragment.

Throws:

Exception