net.esper.eql.expression
Class ExprStaticMethodNode

java.lang.Object
  extended by net.esper.eql.expression.ExprNode
      extended by net.esper.eql.expression.ExprStaticMethodNode
All Implemented Interfaces:
ExprEvaluator, ExprValidator

public class ExprStaticMethodNode
extends ExprNode

Represents an invocation of a static library method in the expression tree.


Constructor Summary
ExprStaticMethodNode(java.lang.String className, java.lang.String methodName)
          Ctor.
 
Method Summary
 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)
          Evaluate event tuple and return result.
protected  java.lang.String getClassName()
          Returns the class name.
protected  java.lang.String getMethodName()
          Returns the method name.
 java.lang.Class[] getParamTypes()
          Returns parameter descriptor.
protected  java.lang.reflect.Method getStaticMethod()
          Returns the static method.
 java.lang.Class getType()
          Returns the type that the node's evaluate method returns an instance of.
 java.lang.String toExpressionString()
          Returns the expression node rendered as a string.
 void validate(StreamTypeService streamTypeService, AutoImportService autoImportService)
          Validate node.
 
Methods inherited from class net.esper.eql.expression.ExprNode
accept, addChildNode, deepEquals, dumpDebug, getChildNodes, getValidatedSubtree
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ExprStaticMethodNode

public ExprStaticMethodNode(java.lang.String className,
                            java.lang.String methodName)
Ctor.

Parameters:
className - - the declaring class for the method that this node will invoke
methodName - - the name of the method that this node will invoke
Method Detail

getStaticMethod

protected java.lang.reflect.Method getStaticMethod()
Returns the static method.

Returns:
the static method that this node invokes

getClassName

protected java.lang.String getClassName()
Returns the class name.

Returns:
the class that declared the static method

getMethodName

protected java.lang.String getMethodName()
Returns the method name.

Returns:
the name of the method

getParamTypes

public java.lang.Class[] getParamTypes()
Returns parameter descriptor.

Returns:
the types of the child nodes of this node

toExpressionString

public java.lang.String toExpressionString()
Description copied from class: ExprNode
Returns the expression node rendered as a string.

Specified by:
toExpressionString in class ExprNode
Returns:
string rendering of expression

equalsNode

public boolean equalsNode(ExprNode node)
Description copied from class: 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.

Specified by:
equalsNode in class ExprNode
Parameters:
node - to compare to
Returns:
true if semantically equal, or false if not equals

validate

public void validate(StreamTypeService streamTypeService,
                     AutoImportService autoImportService)
              throws ExprValidationException
Description copied from interface: ExprValidator
Validate node.

Parameters:
streamTypeService - serves stream event type info
autoImportService - - for resolving class names in library method invocations
Throws:
ExprValidationException - thrown when validation failed

getType

public java.lang.Class getType()
                        throws ExprValidationException
Description copied from interface: ExprValidator
Returns the type that the node's evaluate method returns an instance of.

Returns:
type returned when evaluated
Throws:
ExprValidationException - thrown when validation failed

evaluate

public java.lang.Object evaluate(EventBean[] eventsPerStream)
Description copied from interface: ExprEvaluator
Evaluate event tuple and return result.

Parameters:
eventsPerStream - - event tuple
Returns:
evaluation result, a boolean value for OR/AND-type evalution nodes.