Package com.espertech.esper.common.internal.epl.expression.ops

Class ExprMathNode

java.lang.Object

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

com.espertech.esper.common.internal.epl.expression.ops.ExprMathNode

All Implemented Interfaces:

ExprNode, ExprNodeRenderable, ExprValidator

public class ExprMathNode
extends ExprNodeBase

Represents a simple Math (+/-/divide/*) in a filter expression tree.

Constructor Summary

Constructors

Constructor	Description
ExprMathNode(MathArithTypeEnum mathArithTypeEnum, boolean isIntegerDivision, boolean isDivisionByZeroReturnsNull)	Ctor.

Method Summary

Modifier and Type	Method	Description
boolean	equalsNode(ExprNode node, boolean ignoreStreamPrefix)	Return true if a expression node semantically equals the current node, or false if not.
ExprEvaluator	getExprEvaluator()
ExprForge	getForge()
MathArithTypeEnum	getMathArithTypeEnum()	Returns the type of math.
ExprPrecedenceEnum	getPrecedence()	Returns precedence.
boolean	isConstantResult()
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 Details

ExprMathNode

public ExprMathNode(MathArithTypeEnum mathArithTypeEnum,
 boolean isIntegerDivision,
 boolean isDivisionByZeroReturnsNull)

Ctor.

Parameters:

mathArithTypeEnum - - type of math

isIntegerDivision - - false for division returns double, true for using Java-standard integer division

isDivisionByZeroReturnsNull - - false for division-by-zero returns infinity, true for null

Method Details

getExprEvaluator

public ExprEvaluator getExprEvaluator()

getForge

public ExprForge getForge()

validate

public ExprNode validate(ExprValidationContext validationContext)
                  throws ExprValidationException

Throws:

ExprValidationException

isConstantResult

public boolean isConstantResult()

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.

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.

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

getMathArithTypeEnum

public MathArithTypeEnum getMathArithTypeEnum()

Returns the type of math.

Returns:

math type