com.espertech.esper.epl.expression.funcs

Class ExprPlugInSingleRowNode

java.lang.Object

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

com.espertech.esper.epl.expression.funcs.ExprPlugInSingleRowNode

All Implemented Interfaces:

ExprFilterOptimizableNode, ExprNode, ExprNodeInnerNodeProvider, ExprNodeRenderable, ExprValidator, MetaDefItem, Serializable

public class ExprPlugInSingleRowNode
extends ExprNodeBase
implements ExprNodeInnerNodeProvider, ExprFilterOptimizableNode

Represents an invocation of a plug-in single-row function in the expression tree.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ExprPlugInSingleRowNode(String functionName, Class clazz, List<ExprChainedSpec> chainSpec, EngineImportSingleRowDesc config)

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.
boolean	equalsNode(ExprNode node, boolean ignoreStreamPrefix) Return true if a expression node semantically equals the current node, or false if not.
List<ExprNode>	getAdditionalNodes()
List<ExprChainedSpec>	getChainSpec()
ExprEvaluator	getExprEvaluator()
FilterSpecLookupable	getFilterLookupable()
boolean	getFilterLookupEligible()
ExprForge	getForge()
String	getFunctionName()
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	toPrecedenceFreeEPL(StringWriter writer)
ExprNode	validate(ExprValidationContext validationContext)

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

addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, setChildNode, setChildNodes, toEPL

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprPlugInSingleRowNode

public ExprPlugInSingleRowNode(String functionName,
                               Class clazz,
                               List<ExprChainedSpec> chainSpec,
                               EngineImportSingleRowDesc config)

Method Detail

getExprEvaluator

public ExprEvaluator getExprEvaluator()

getForge

public ExprForge getForge()

Specified by:

getForge in interface ExprNode

getChainSpec

public List<ExprChainedSpec> getChainSpec()

isConstantResult

public boolean isConstantResult()

Description copied from interface: ExprNode

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.

Specified by:

isConstantResult in interface ExprNode

Returns:

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

getFunctionName

public String getFunctionName()

getFilterLookupEligible

public boolean getFilterLookupEligible()

Specified by:

getFilterLookupEligible in interface ExprFilterOptimizableNode

getFilterLookupable

public FilterSpecLookupable getFilterLookupable()

Specified by:

getFilterLookupable in interface ExprFilterOptimizableNode

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

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Specified by:

validate in interface ExprValidator

Throws:

ExprValidationException

accept

public void accept(ExprNodeVisitor visitor)

Description copied from interface: ExprNode

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.

Specified by:

accept in interface ExprNode

Overrides:

accept in class ExprNodeBase

Parameters:

visitor - to visit each node and each child node.

accept

public void accept(ExprNodeVisitorWithParent visitor)

Description copied from interface: ExprNode

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.

Specified by:

accept in interface ExprNode

Overrides:

accept in class ExprNodeBase

Parameters:

visitor - to visit each node and each child node.

acceptChildnodes

public void acceptChildnodes(ExprNodeVisitorWithParent visitor,
                             ExprNode parent)

Description copied from interface: ExprNode

Accept a visitor that receives both parent and child node.

Specified by:

acceptChildnodes in interface ExprNode

Overrides:

acceptChildnodes in class ExprNodeBase

Parameters:

visitor - to apply

parent - node

replaceUnlistedChildNode

public void replaceUnlistedChildNode(ExprNode nodeToReplace,
                                     ExprNode newNode)

Specified by:

replaceUnlistedChildNode in interface ExprNode

Overrides:

replaceUnlistedChildNode in class ExprNodeBase

getAdditionalNodes

public List<ExprNode> getAdditionalNodes()

Specified by:

getAdditionalNodes in interface ExprNodeInnerNodeProvider