com.espertech.esper.epl.script
Class ExprNodeScript

java.lang.Object
  extended by com.espertech.esper.epl.expression.ExprNodeBase
      extended by com.espertech.esper.epl.script.ExprNodeScript
All Implemented Interfaces:
ExprNode, ExprValidator, MetaDefItem, java.io.Serializable

public class ExprNodeScript
extends ExprNodeBase

See Also:
Serialized Form

Field Summary
static java.lang.String CONTEXT_BINDING_NAME
           
 
Constructor Summary
ExprNodeScript(java.lang.String defaultDialect, ExpressionScriptProvided script, java.util.List<ExprNode> parameters)
           
 
Method Summary
 boolean equalsNode(ExprNode node)
          Return true if a expression node semantically equals the current node, or false if not.
 ExprEvaluator getExprEvaluator()
           
 java.util.List<ExprNode> getParameters()
           
 ExpressionScriptProvided getScript()
           
 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.
 java.lang.String toExpressionString()
          Returns the expression node rendered as a string.
 void validate(ExprValidationContext validationContext)
           
 
Methods inherited from class com.espertech.esper.epl.expression.ExprNodeBase
accept, accept, acceptChildnodes, addChildNode, addChildNodes, addChildNodeToFront, getChildNodes, replaceUnlistedChildNode, setChildNode, setChildNodes
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

CONTEXT_BINDING_NAME

public static java.lang.String CONTEXT_BINDING_NAME
Constructor Detail

ExprNodeScript

public ExprNodeScript(java.lang.String defaultDialect,
                      ExpressionScriptProvided script,
                      java.util.List<ExprNode> parameters)
Method Detail

getExprEvaluator

public ExprEvaluator getExprEvaluator()

getParameters

public java.util.List<ExprNode> getParameters()

toExpressionString

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

Returns:
string rendering of expression

getScript

public ExpressionScriptProvided getScript()

isConstantResult

public boolean isConstantResult()
Description copied from interface: ExprNode
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.

Returns:
true for constant evaluation value, false for non-constant evaluation value

equalsNode

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

Parameters:
node - to compare to
Returns:
true if semantically equal, or false if not equals

validate

public void validate(ExprValidationContext validationContext)
              throws ExprValidationException
Throws:
ExprValidationException

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