Class XBaseEvaluator
- java.lang.Object
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- org.eclipse.viatra.query.patternlanguage.emf.specification.XBaseEvaluator
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- All Implemented Interfaces:
IExpressionEvaluator
public class XBaseEvaluator extends java.lang.Object implements IExpressionEvaluator
Evaluates an XBase XExpression inside Rete.
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Constructor Summary
Constructors Constructor Description XBaseEvaluator(org.eclipse.xtext.xbase.XExpression xExpression, Pattern pattern)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
evaluateExpression(IValueProvider provider)
The expression evaluator codeorg.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.
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Constructor Detail
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XBaseEvaluator
public XBaseEvaluator(org.eclipse.xtext.xbase.XExpression xExpression, Pattern pattern)
- Parameters:
xExpression
- the expression to evaluatepattern
-- Since:
- 2.0
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Method Detail
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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 interfaceIExpressionEvaluator
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getExpression
public org.eclipse.xtext.xbase.XExpression getExpression()
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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 interfaceIExpressionEvaluator
- 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
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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 interfaceIExpressionEvaluator
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