com.espertech.esper.common.internal.epl.expression.variable

Class ExprVariableNodeImpl

java.lang.Object

com.espertech.esper.common.internal.epl.expression.core.ExprNodeBase

com.espertech.esper.common.internal.epl.expression.variable.ExprVariableNodeImpl

All Implemented Interfaces:

ExprEvaluator, ExprForge, ExprForgeInstrumentable, ExprNode, ExprNodeDeployTimeConst, ExprNodeRenderable, ExprValidator, ExprVariableNode, Serializable

public class ExprVariableNodeImpl
extends ExprNodeBase
implements ExprForgeInstrumentable, ExprEvaluator, ExprVariableNode

Represents a variable in an expression tree.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ExprVariableNodeImpl(VariableMetaData variableMeta, String optSubPropName)

Method Summary

Modifier and Type	Method and Description
CodegenExpression	codegenGetDeployTimeConstValue(CodegenClassScope classScope)
boolean	equalsNode(ExprNode node, boolean ignoreStreamPrefix) Return true if a expression node semantically equals the current node, or false if not.
Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) Evaluate event tuple and return result.
CodegenExpression	evaluateCodegen(Class requiredType, CodegenMethodScope parent, ExprForgeCodegenSymbol symbols, CodegenClassScope classScope)
CodegenExpression	evaluateCodegenUninstrumented(Class requiredType, CodegenMethodScope parent, ExprForgeCodegenSymbol symbols, CodegenClassScope classScope)
Class	getEvaluationType()
ExprEvaluator	getExprEvaluator()
ExprForge	getForge()
ExprForgeConstantType	getForgeConstantType()
ExprNodeRenderable	getForgeRenderable()
ExprPrecedenceEnum	getPrecedence() Returns precedence.
VariableMetaData	getVariableMetadata()
String	getVariableNameWithSubProp()
void	toPrecedenceFreeEPL(StringWriter writer)
String	toString()
ExprNode	validate(ExprValidationContext validationContext)

Methods inherited from class com.espertech.esper.common.internal.epl.expression.core.ExprNodeBase

accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, checkValidated, checkValidatedException, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprVariableNodeImpl

public ExprVariableNodeImpl(VariableMetaData variableMeta,
                            String optSubPropName)

Method Detail

getExprEvaluator

public ExprEvaluator getExprEvaluator()

Specified by:

getExprEvaluator in interface ExprForge

getVariableMetadata

public VariableMetaData getVariableMetadata()

Specified by:

getVariableMetadata in interface ExprVariableNode

getEvaluationType

public Class getEvaluationType()

Specified by:

getEvaluationType in interface ExprForge

getForge

public ExprForge getForge()

Specified by:

getForge in interface ExprNode

getForgeRenderable

public ExprNodeRenderable getForgeRenderable()

Specified by:

getForgeRenderable in interface ExprForge

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Specified by:

validate in interface ExprValidator

Throws:

ExprValidationException

toString

public String toString()

Overrides:

toString in class Object

evaluate

public Object evaluate(EventBean[] eventsPerStream,
                       boolean isNewData,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: ExprEvaluator

Evaluate event tuple and return result.

Specified by:

evaluate in interface ExprEvaluator

Parameters:

eventsPerStream - - event tuple

isNewData - - indicates whether we are dealing with new data (istream) or old data (rstream)

exprEvaluatorContext - context for expression evaluation

Returns:

evaluation result, a boolean value for OR/AND-type evalution nodes.

evaluateCodegenUninstrumented

public CodegenExpression evaluateCodegenUninstrumented(Class requiredType,
                                                       CodegenMethodScope parent,
                                                       ExprForgeCodegenSymbol symbols,
                                                       CodegenClassScope classScope)

Specified by:

evaluateCodegenUninstrumented in interface ExprForgeInstrumentable

codegenGetDeployTimeConstValue

public CodegenExpression codegenGetDeployTimeConstValue(CodegenClassScope classScope)

Specified by:

codegenGetDeployTimeConstValue in interface ExprNodeDeployTimeConst

evaluateCodegen

public CodegenExpression evaluateCodegen(Class requiredType,
                                         CodegenMethodScope parent,
                                         ExprForgeCodegenSymbol symbols,
                                         CodegenClassScope classScope)

Specified by:

evaluateCodegen in interface ExprForge

getForgeConstantType

public ExprForgeConstantType getForgeConstantType()

Specified by:

getForgeConstantType in interface ExprForge

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(StringWriter writer)

Specified by:

toPrecedenceFreeEPL in class ExprNodeBase

getPrecedence

public ExprPrecedenceEnum getPrecedence()

Description copied from interface: ExprNode

Returns precedence.

Specified by:

getPrecedence in interface ExprNode

Returns:

precedence

equalsNode

public boolean equalsNode(ExprNode node,
                          boolean ignoreStreamPrefix)

Description copied from interface: ExprNode

Return true if a expression node semantically equals the current node, or false if not.

Concrete implementations should compare the type and any additional information that impact the evaluation of a node.

Specified by:

equalsNode in interface ExprNode

Parameters:

node - to compare to

ignoreStreamPrefix - when the equals-comparison can ignore prefix of event properties

Returns:

true if semantically equal, or false if not equals

getVariableNameWithSubProp

public String getVariableNameWithSubProp()

Specified by:

getVariableNameWithSubProp in interface ExprVariableNode