org.apache.nifi.attribute.expression.language

Interface EvaluationContext

All Known Implementing Classes:

StandardEvaluationContext

public interface EvaluationContext

Method Summary

Modifier and Type	Method and Description
EvaluatorState	getEvaluatorState()
Set<String>	getExpressionKeys() Returns the names of all attributes, variables, etc.
String	getExpressionValue(String name) Returns the name of an attribute, variable, environment variable, or system variable that can be referenced in the Expression Language
Parameter	getParameter(String parameterName)
String	getState(String key)

Method Detail

getExpressionValue

String getExpressionValue(String name)

Returns the name of an attribute, variable, environment variable, or system variable that can be referenced in the Expression Language

Parameters:

name - the name of the attribute, variable, etc.

Returns:

the value assigned to the attribute, variable, etc. or null if no such value exists

getExpressionKeys

Set<String> getExpressionKeys()

Returns the names of all attributes, variables, etc. that can be used in Expression Language

Returns:

the names of all keys that can be used in Expression Language

getState

String getState(String key)

getParameter

Parameter getParameter(String parameterName)

getEvaluatorState

EvaluatorState getEvaluatorState()