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

Class ExprSubstitutionNode

java.lang.Object

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

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

All Implemented Interfaces:

ExprForge, ExprNode, ExprNodeDeployTimeConst, ExprNodeRenderable, ExprValidator

public class ExprSubstitutionNode
extends ExprNodeBase
implements ExprForge, ExprNodeDeployTimeConst

Represents a substitution value to be substituted in an expression tree, not valid for any purpose of use as an expression, however can take a place in an expression tree.

Constructor Summary

Constructors

Constructor and Description
ExprSubstitutionNode(String optionalName, ClassDescriptor optionalType)

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)
CodegenExpression	evaluateCodegen(EPTypeClass requiredType, CodegenMethodScope codegenMethodScope, ExprForgeCodegenSymbol exprSymbol, CodegenClassScope codegenClassScope)
EPTypeClass	getEvaluationType()
ExprEvaluator	getExprEvaluator()
ExprForge	getForge()
ExprForgeConstantType	getForgeConstantType()
ExprNodeRenderable	getForgeRenderable()
String	getOptionalName() Returns the substitution parameter name (or null if by-index).
ClassDescriptor	getOptionalType()
ExprPrecedenceEnum	getPrecedence() Returns precedence.
EPTypeClass	getResolvedType()
void	renderForFilterPlan(StringBuilder out)
void	toPrecedenceFreeEPL(StringWriter writer, ExprNodeRenderableFlags flags)
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, toString, wait, wait, wait

Constructor Detail

ExprSubstitutionNode

public ExprSubstitutionNode(String optionalName,
                            ClassDescriptor optionalType)

Method Detail

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Specified by:

validate in interface ExprValidator

Throws:

ExprValidationException

getOptionalName

public String getOptionalName()

Returns the substitution parameter name (or null if by-index).

Returns:

name

evaluate

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

getExprEvaluator

public ExprEvaluator getExprEvaluator()

Specified by:

getExprEvaluator in interface ExprForge

getForge

public ExprForge getForge()

Specified by:

getForge in interface ExprNode

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(StringWriter writer,
                                ExprNodeRenderableFlags flags)

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

evaluateCodegen

public CodegenExpression evaluateCodegen(EPTypeClass requiredType,
                                         CodegenMethodScope codegenMethodScope,
                                         ExprForgeCodegenSymbol exprSymbol,
                                         CodegenClassScope codegenClassScope)

Specified by:

evaluateCodegen in interface ExprForge

codegenGetDeployTimeConstValue

public CodegenExpression codegenGetDeployTimeConstValue(CodegenClassScope classScope)

Specified by:

codegenGetDeployTimeConstValue in interface ExprNodeDeployTimeConst

getEvaluationType

public EPTypeClass getEvaluationType()

Specified by:

getEvaluationType in interface ExprForge

getForgeConstantType

public ExprForgeConstantType getForgeConstantType()

Specified by:

getForgeConstantType in interface ExprForge

getForgeRenderable

public ExprNodeRenderable getForgeRenderable()

Specified by:

getForgeRenderable in interface ExprForge

getOptionalType

public ClassDescriptor getOptionalType()

getResolvedType

public EPTypeClass getResolvedType()

renderForFilterPlan

public void renderForFilterPlan(StringBuilder out)

Specified by:

renderForFilterPlan in interface ExprNodeDeployTimeConst