org.eclipse.viatra.query.patternlanguage.emf.specification

Class XBaseEvaluator

java.lang.Object

org.eclipse.viatra.query.patternlanguage.emf.specification.XBaseEvaluator

All Implemented Interfaces:

IExpressionEvaluator

public class XBaseEvaluator
extends java.lang.Object
implements IExpressionEvaluator

Evaluates an XBase XExpression inside Rete.

Constructor Summary

Constructors

Constructor and Description
XBaseEvaluator(org.eclipse.xtext.xbase.XExpression xExpression, Pattern pattern)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluateExpression(IValueProvider provider) The expression evaluator code
org.eclipse.xtext.xbase.XExpression	getExpression()
java.lang.Iterable<java.lang.String>	getInputParameterNames() All input parameter names should be reported correctly.
java.lang.String	getShortDescription() A textual description of the expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

XBaseEvaluator

public XBaseEvaluator(org.eclipse.xtext.xbase.XExpression xExpression,
                      Pattern pattern)
               throws org.eclipse.viatra.query.patternlanguage.emf.specification.internal.SpecificationBuilderException

Parameters:

xExpression - the expression to evaluate

pattern -

Throws:

org.eclipse.viatra.query.patternlanguage.emf.specification.internal.SpecificationBuilderException

Method Detail

getInputParameterNames

public java.lang.Iterable<java.lang.String> getInputParameterNames()

Description copied from interface: IExpressionEvaluator

All input parameter names should be reported correctly.

Specified by:

getInputParameterNames in interface IExpressionEvaluator

getExpression

public org.eclipse.xtext.xbase.XExpression getExpression()

evaluateExpression

public java.lang.Object evaluateExpression(IValueProvider provider)
                                    throws java.lang.Exception

Description copied from interface: IExpressionEvaluator

The expression evaluator code

Specified by:

evaluateExpression in interface IExpressionEvaluator

Parameters:

provider - the value provider is an engine-specific way of reading internal variable tuples to evaluate the expression with

Returns:

the result of the expression: in case of predicate evaluation the return value must be true or false; otherwise the result can be an arbitrary object. No null values should be returned.

Throws:

java.lang.Exception

getShortDescription

public java.lang.String getShortDescription()

Description copied from interface: IExpressionEvaluator

A textual description of the expression. Used only for debug purposes, but must not be null.

Specified by:

getShortDescription in interface IExpressionEvaluator