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java.lang.Objectnet.esper.eql.expression.ExprNode
net.esper.eql.expression.ExprMathNode
public class ExprMathNode
Represents a simple Math (+/-/divide/*) in a filter expression tree.
Nested Class Summary |
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Nested classes/interfaces inherited from class net.esper.eql.expression.ExprNode |
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ExprNode.MappedPropertyParseResult |
Constructor Summary | |
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ExprMathNode(MathArithTypeEnum mathArithTypeEnum)
Ctor. |
Method Summary | |
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boolean |
equalsNode(ExprNode node)
Return true if a expression node semantically equals the current node, or false if not. |
Object |
evaluate(EventBean[] eventsPerStream,
boolean isNewData)
Evaluate event tuple and return result. |
MathArithTypeEnum |
getMathArithTypeEnum()
Returns the type of math. |
Class |
getType()
Returns the type that the node's evaluate method returns an instance of. |
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. |
String |
toExpressionString()
Returns the expression node rendered as a string. |
void |
validate(StreamTypeService streamTypeService,
MethodResolutionService methodResolutionService,
ViewResourceDelegate viewResourceDelegate,
TimeProvider timeProvider)
Validate node. |
Methods inherited from class net.esper.eql.expression.ExprNode |
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accept, addChildNode, deepEquals, dumpDebug, getChildNodes, getValidatedSubtree, parseMappedProperty |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ExprMathNode(MathArithTypeEnum mathArithTypeEnum)
mathArithTypeEnum
- - type of mathMethod Detail |
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public void validate(StreamTypeService streamTypeService, MethodResolutionService methodResolutionService, ViewResourceDelegate viewResourceDelegate, TimeProvider timeProvider) throws ExprValidationException
ExprValidator
streamTypeService
- serves stream event type infomethodResolutionService
- - for resolving class names in library method invocationsviewResourceDelegate
- - delegates for view resources to expression nodestimeProvider
- - provides engine current time
ExprValidationException
- thrown when validation failedpublic Class getType() throws ExprValidationException
ExprValidator
ExprValidationException
- thrown when validation failedpublic boolean isConstantResult()
ExprNode
isConstantResult
in class ExprNode
public Object evaluate(EventBean[] eventsPerStream, boolean isNewData)
ExprEvaluator
eventsPerStream
- - event tupleisNewData
- - indicates whether we are dealing with new data (istream) or old data (rstream)
public String toExpressionString()
ExprNode
toExpressionString
in class ExprNode
public boolean equalsNode(ExprNode node)
ExprNode
Concrete implementations should compare the type and any additional information that impact the evaluation of a node.
equalsNode
in class ExprNode
node
- to compare to
public MathArithTypeEnum getMathArithTypeEnum()
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