com.espertech.esper.epl.expression.table

Class ExprTableAccessNodeTopLevel

java.lang.Object

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

com.espertech.esper.epl.expression.table.ExprTableAccessNode

com.espertech.esper.epl.expression.table.ExprTableAccessNodeTopLevel

All Implemented Interfaces:

ExprEvaluator, ExprEvaluatorTypableReturn, ExprNode, ExprValidator, MetaDefItem, Serializable

public class ExprTableAccessNodeTopLevel
extends ExprTableAccessNode
implements ExprEvaluatorTypableReturn

See Also:

Serialized Form

Field Summary

Fields inherited from class com.espertech.esper.epl.expression.table.ExprTableAccessNode

groupKeyEvaluators, strategy, tableName

Constructor Summary

Constructors

Constructor and Description
ExprTableAccessNodeTopLevel(String tableName)

Method Summary

Modifier and Type	Method and Description
protected boolean	equalsNodeInternal(ExprTableAccessNode other)
Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) Evaluate event tuple and return result.
Object[][]	evaluateTypableMulti(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
Object[]	evaluateTypableSingle(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context)
ExprEvaluator	getExprEvaluator()
LinkedHashMap<String,Object>	getRowProperties() Return null to indicate no row-type result available, or a map of property names and types to indicate a row-type result is available.
Class	getType() Returns the type that the node's evaluate method returns an instance of.
Boolean	isMultirow() Return true for multi-row return, return false for return of single row only
void	setStrategy(ExprTableAccessEvalStrategy strategy)
void	toPrecedenceFreeEPL(StringWriter writer)
protected void	validateBindingInternal(ExprValidationContext validationContext, TableMetadata tableMetadata)

Methods inherited from class com.espertech.esper.epl.expression.table.ExprTableAccessNode

equalsNode, getGroupKeyEvaluators, getPrecedence, getTableName, hashCode, isConstantResult, toPrecedenceFreeEPLInternal, toPrecedenceFreeEPLInternal, validate, validateGroupKeys, validateSubpropertyGetCol

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprTableAccessNodeTopLevel

public ExprTableAccessNodeTopLevel(String tableName)

Method Detail

setStrategy

public void setStrategy(ExprTableAccessEvalStrategy strategy)

Overrides:

setStrategy in class ExprTableAccessNode

getExprEvaluator

public ExprEvaluator getExprEvaluator()

Specified by:

getExprEvaluator in interface ExprNode

validateBindingInternal

protected void validateBindingInternal(ExprValidationContext validationContext,
                                       TableMetadata tableMetadata)
                                throws ExprValidationException

Specified by:

validateBindingInternal in class ExprTableAccessNode

Throws:

ExprValidationException

getType

public Class getType()

Description copied from interface: ExprEvaluator

Returns the type that the node's evaluate method returns an instance of.

Specified by:

getType in interface ExprEvaluator

Returns:

type returned when evaluated

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.

getRowProperties

public LinkedHashMap<String,Object> getRowProperties()
                                              throws ExprValidationException

Description copied from interface: ExprEvaluatorTypableReturn

Return null to indicate no row-type result available, or a map of property names and types to indicate a row-type result is available.

Specified by:

getRowProperties in interface ExprEvaluatorTypableReturn

Returns:

map of property names and types or null

Throws:

ExprValidationException - if the expression is invalid

isMultirow

public Boolean isMultirow()

Description copied from interface: ExprEvaluatorTypableReturn

Return true for multi-row return, return false for return of single row only

Specified by:

isMultirow in interface ExprEvaluatorTypableReturn

Returns:

multi-row flag

evaluateTypableSingle

public Object[] evaluateTypableSingle(EventBean[] eventsPerStream,
                                      boolean isNewData,
                                      ExprEvaluatorContext context)

Specified by:

evaluateTypableSingle in interface ExprEvaluatorTypableReturn

evaluateTypableMulti

public Object[][] evaluateTypableMulti(EventBean[] eventsPerStream,
                                       boolean isNewData,
                                       ExprEvaluatorContext context)

Specified by:

evaluateTypableMulti in interface ExprEvaluatorTypableReturn

toPrecedenceFreeEPL

public void toPrecedenceFreeEPL(StringWriter writer)

Specified by:

toPrecedenceFreeEPL in class ExprNodeBase

equalsNodeInternal

protected boolean equalsNodeInternal(ExprTableAccessNode other)

Specified by:

equalsNodeInternal in class ExprTableAccessNode