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java.lang.Objectcom.espertech.esper.epl.expression.ExprNode
com.espertech.esper.epl.expression.ExprStreamInstanceMethodNode
public class ExprStreamInstanceMethodNode
Represents an invocation of a instance method on an event of a given stream in the expression tree.
Nested Class Summary |
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Nested classes/interfaces inherited from class com.espertech.esper.epl.expression.ExprNode |
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ExprNode.MappedPropertyParseResult |
Constructor Summary | |
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ExprStreamInstanceMethodNode(String streamName,
String methodName)
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. |
String |
getMethodName()
Returns the method name. |
Class[] |
getParamTypes()
Returns parameter descriptor. |
int |
getStreamId()
Returns stream id supplying the property value. |
String |
getStreamName()
Returns the stream name. |
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,
VariableService variableService)
Validate node. |
Methods inherited from class com.espertech.esper.epl.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 ExprStreamInstanceMethodNode(String streamName, String methodName)
streamName
- - the declaring class for the method that this node will invokemethodName
- - the name of the method that this node will invokeMethod Detail |
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public boolean isConstantResult()
ExprNode
isConstantResult
in class ExprNode
public String getStreamName()
public String getMethodName()
public Class[] getParamTypes()
public int getStreamId()
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 void validate(StreamTypeService streamTypeService, MethodResolutionService methodResolutionService, ViewResourceDelegate viewResourceDelegate, TimeProvider timeProvider, VariableService variableService) 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 timevariableService
- - provides access to variable values
ExprValidationException
- thrown when validation failedpublic Class getType() throws ExprValidationException
ExprValidator
ExprValidationException
- thrown when validation failedpublic Object evaluate(EventBean[] eventsPerStream, boolean isNewData)
ExprEvaluator
eventsPerStream
- - event tupleisNewData
- - indicates whether we are dealing with new data (istream) or old data (rstream)
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© 2007 EsperTech Inc. All rights reserved. Visit us at espertech.com |
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