com.espertech.esper.epl.expression.core

Interface ExprNode

All Superinterfaces:

ExprValidator, MetaDefItem, Serializable

All Known Subinterfaces:

ExprAggregateNode, ExprAndNode, ExprBetweenNode, ExprConstantNode, ExprDeclaredNode, ExprDotNode, ExprEqualsNode, ExprIdentNode, ExprInNode, ExprRelationalOpNode, ExprStreamRefNode, ExprStreamUnderlyingNode, ExprTimePeriod, ExprVariableNode

All Known Implementing Classes:

ExprAggCountMinSketchNode, ExprAggMultiFunctionLinearAccessNode, ExprAggMultiFunctionSortedMinMaxByNode, ExprAggregateNodeBase, ExprAggregateNodeGroupKey, ExprAndNodeImpl, ExprAppDotMethodImpl, ExprArrayNode, ExprAvedevNode, ExprAvgNode, ExprBetweenNodeImpl, ExprBitWiseNode, ExprCaseNode, ExprCastNode, ExprCoalesceNode, ExprConcatNode, ExprConstantNodeImpl, ExprContextPropertyNode, ExprCountEverNode, ExprCountNode, ExprCurrentEvaluationContextNode, ExprDeclaredNodeImpl, ExprDotNodeImpl, ExprEqualsAllAnyNode, ExprEqualsNodeImpl, ExprFirstEverNode, ExprGroupingIdNode, ExprGroupingNode, ExprIdentNodeImpl, ExprInNodeImpl, ExprInstanceofNode, ExprIStreamNode, ExprLambdaGoesNode, ExprLastEverNode, ExprLeavingAggNode, ExprLikeNode, ExprMathNode, ExprMedianNode, ExprMinMaxAggrNode, ExprMinMaxRowNode, ExprNamedParameterNodeImpl, ExprNewInstanceNode, ExprNewStructNode, ExprNodeBase, ExprNodeScript, ExprNodeValidated, ExprNotNode, ExprNthAggNode, ExprNumberSetCronParam, ExprNumberSetFrequency, ExprNumberSetList, ExprNumberSetRange, ExprOrderedExpr, ExprOrNode, ExprPlugInAggMultiFunctionNode, ExprPlugInAggNode, ExprPlugInSingleRowNode, ExprPreviousMatchRecognizeNode, ExprPreviousNode, ExprPriorNode, ExprPropertyExistsNode, ExprRateAggNode, ExprRegexpNode, ExprRelationalOpAllAnyNode, ExprRelationalOpNodeImpl, ExprStddevNode, ExprStreamUnderlyingNodeImpl, ExprSubselectAllSomeAnyNode, ExprSubselectExistsNode, ExprSubselectInNode, ExprSubselectNode, ExprSubselectRowNode, ExprSubstitutionNode, ExprSumNode, ExprTableAccessNode, ExprTableAccessNodeKeys, ExprTableAccessNodeSubprop, ExprTableAccessNodeSubpropAccessor, ExprTableAccessNodeTopLevel, ExprTableIdentNode, ExprTableIdentNodeSubpropAccessor, ExprTimePeriodImpl, ExprTimestampNode, ExprTypedNoEvalNode, ExprTypeofNode, ExprVariableNodeImpl, ExprWildcardImpl

public interface ExprNode
extends ExprValidator, MetaDefItem, Serializable

Method Summary

Modifier and Type	Method and Description
void	accept(ExprNodeVisitor visitor) Accept the visitor.
void	accept(ExprNodeVisitorWithParent visitor) Accept the visitor.
void	acceptChildnodes(ExprNodeVisitorWithParent visitor, ExprNode parent) Accept a visitor that receives both parent and child node.
void	addChildNode(ExprNode childNode) Adds a child node.
void	addChildNodes(Collection<ExprNode> childNodes) Adds child nodes.
boolean	equalsNode(ExprNode node, boolean ignoreStreamPrefix) Return true if a expression node semantically equals the current node, or false if not.
ExprNode[]	getChildNodes() Returns list of child nodes.
ExprEvaluator	getExprEvaluator()
ExprPrecedenceEnum	getPrecedence() Returns precedence.
boolean	isConstantResult() Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.
void	replaceUnlistedChildNode(ExprNode nodeToReplace, ExprNode newNode)
void	setChildNode(int index, ExprNode newNode)
void	setChildNodes(ExprNode... nodes)
void	toEPL(StringWriter writer, ExprPrecedenceEnum parentPrecedence)

Methods inherited from interface com.espertech.esper.epl.expression.core.ExprValidator

validate

Method Detail

getExprEvaluator

ExprEvaluator getExprEvaluator()

toEPL

void toEPL(StringWriter writer,
           ExprPrecedenceEnum parentPrecedence)

getPrecedence

ExprPrecedenceEnum getPrecedence()

Returns precedence.

Returns:

precedence

isConstantResult

boolean isConstantResult()

Returns true if the expression node's evaluation value doesn't depend on any events data, as must be determined at validation time, which is bottom-up and therefore reliably allows each node to determine constant value.

Returns:

true for constant evaluation value, false for non-constant evaluation value

equalsNode

boolean equalsNode(ExprNode node,
                   boolean ignoreStreamPrefix)

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.

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

accept

void accept(ExprNodeVisitor visitor)

Accept the visitor. The visitor will first visit the parent then visit all child nodes, then their child nodes.

The visitor can decide to skip child nodes by returning false in isVisit.

Parameters:

visitor - to visit each node and each child node.

accept

void accept(ExprNodeVisitorWithParent visitor)

Accept the visitor. The visitor will first visit the parent then visit all child nodes, then their child nodes.

The visitor can decide to skip child nodes by returning false in isVisit.

Parameters:

visitor - to visit each node and each child node.

acceptChildnodes

void acceptChildnodes(ExprNodeVisitorWithParent visitor,
                      ExprNode parent)

Accept a visitor that receives both parent and child node.

Parameters:

visitor - to apply

parent - node

addChildNode

void addChildNode(ExprNode childNode)

Adds a child node.

Parameters:

childNode - is the child evaluation tree node to add

addChildNodes

void addChildNodes(Collection<ExprNode> childNodes)

Adds child nodes.

Parameters:

childNodes - are the child evaluation tree node to add

getChildNodes

ExprNode[] getChildNodes()

Returns list of child nodes.

Returns:

list of child nodes

replaceUnlistedChildNode

void replaceUnlistedChildNode(ExprNode nodeToReplace,
                              ExprNode newNode)

setChildNode

void setChildNode(int index,
                  ExprNode newNode)

setChildNodes

void setChildNodes(ExprNode... nodes)