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java.lang.Objectcom.espertech.esper.epl.expression.core.ExprNodeBase
com.espertech.esper.epl.expression.core.ExprSubstitutionNode
public class ExprSubstitutionNode
Represents a substitution value to be substituted in an expression tree, not valid for any purpose of use as an expression, however can take a place in an expression tree.
Constructor Summary | |
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ExprSubstitutionNode(int index)
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. |
java.lang.Object |
evaluate(EventBean[] eventsPerStream,
boolean isNewData,
ExprEvaluatorContext exprEvaluatorContext)
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ExprEvaluator |
getExprEvaluator()
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int |
getIndex()
Returns the substitution parameter index. |
ExprPrecedenceEnum |
getPrecedence()
Returns precedence. |
java.lang.Class |
getType()
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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 |
setIndex(int index)
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void |
toPrecedenceFreeEPL(java.io.StringWriter writer)
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ExprNode |
validate(ExprValidationContext validationContext)
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Methods inherited from class com.espertech.esper.epl.expression.core.ExprNodeBase |
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accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes, toEPL |
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 ExprSubstitutionNode(int index)
index
- is the index of the substitution parameterMethod Detail |
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public ExprNode validate(ExprValidationContext validationContext) throws ExprValidationException
ExprValidationException
public int getIndex()
public void setIndex(int index)
public boolean isConstantResult()
ExprNode
public java.lang.Class getType()
public java.lang.Object evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext)
public ExprEvaluator getExprEvaluator()
public void toPrecedenceFreeEPL(java.io.StringWriter writer)
toPrecedenceFreeEPL
in class ExprNodeBase
public ExprPrecedenceEnum getPrecedence()
ExprNode
public boolean equalsNode(ExprNode node)
ExprNode
Concrete implementations should compare the type and any additional information that impact the evaluation of a node.
node
- to compare to
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© 2006-2014 EsperTech Inc. All rights reserved. Visit us at espertech.com |
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