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java.lang.Objectcom.espertech.esper.epl.expression.ExprNodeBase
com.espertech.esper.epl.expression.ExprAggregateNodeBase
com.espertech.esper.epl.expression.ExprStddevNode
public class ExprStddevNode
Represents the stddev(...) aggregate function is an expression tree.
Field Summary |
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Fields inherited from class com.espertech.esper.epl.expression.ExprAggregateNodeBase |
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aggregationResultFuture, column, isDistinct |
Constructor Summary | |
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ExprStddevNode(boolean distinct,
boolean hasFilter)
Ctor. |
Method Summary | |
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boolean |
equalsNodeAggregate(ExprAggregateNode node)
Return true if a expression aggregate node semantically equals the current node, or false if not. |
protected java.lang.String |
getAggregationFunctionName()
Returns the aggregation function name for representation in a generate expression string. |
AggregationMethodFactory |
validateAggregationChild(ExprValidationContext validationContext)
Gives the aggregation node a chance to validate the sub-expression types. |
Methods inherited from class com.espertech.esper.epl.expression.ExprAggregateNodeBase |
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equalsNode, evaluate, getEventType, getExprEvaluator, getFactory, getType, isConstantResult, isDistinct, setAggregationResultFuture, toExpressionString, validate, validateFilter, validateNumericChildAllowFilter |
Methods inherited from class com.espertech.esper.epl.expression.ExprNodeBase |
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accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.espertech.esper.epl.expression.ExprNode |
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accept, accept, acceptChildnodes, addChildNode, addChildNodes, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes |
Constructor Detail |
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public ExprStddevNode(boolean distinct, boolean hasFilter)
distinct
- - flag indicating unique or non-unique value aggregationMethod Detail |
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public AggregationMethodFactory validateAggregationChild(ExprValidationContext validationContext) throws ExprValidationException
ExprAggregateNodeBase
validateAggregationChild
in class ExprAggregateNodeBase
validationContext
- validation information
ExprValidationException
- when expression validation failedpublic final boolean equalsNodeAggregate(ExprAggregateNode node)
ExprAggregateNodeBase
For use by the equalsNode implementation which compares the distinct flag.
equalsNodeAggregate
in class ExprAggregateNodeBase
node
- to compare to
protected java.lang.String getAggregationFunctionName()
ExprAggregateNodeBase
getAggregationFunctionName
in class ExprAggregateNodeBase
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© 2006-2011 EsperTech Inc. All rights reserved. Visit us at espertech.com |
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