Package org.apache.nifi.attribute.expression.language

Class StandardEvaluationContext

java.lang.Object

org.apache.nifi.attribute.expression.language.StandardEvaluationContext

All Implemented Interfaces:

EvaluationContext

public class StandardEvaluationContext
extends Object
implements EvaluationContext

Field Summary

Fields

Modifier and Type	Field	Description
private final EvaluatorState	evaluatorState
private final ParameterLookup	parameterLookup
private final Map<String,String>	stateMap
private final ValueLookup	valueLookup

Constructor Summary

Constructors

Constructor	Description
StandardEvaluationContext(Map<String,String> variables)
StandardEvaluationContext(Map<String,String> variables, Map<String,String> stateMap, ParameterLookup parameterLookup)
StandardEvaluationContext(ValueLookup valueLookup, Map<String,String> stateMap, ParameterLookup parameterLookup)

Method Summary

Modifier and Type	Method	Description
EvaluatorState	getEvaluatorState()
Set<String>	getExpressionKeys()	Returns the names of all attributes, variables, etc. that can be used in Expression Language
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)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

valueLookup

private final ValueLookup valueLookup

stateMap

private final Map<String,String> stateMap

parameterLookup

private final ParameterLookup parameterLookup

evaluatorState

private final EvaluatorState evaluatorState

Constructor Details

StandardEvaluationContext

public StandardEvaluationContext(Map<String,String> variables)

StandardEvaluationContext

public StandardEvaluationContext(Map<String,String> variables,
 Map<String,String> stateMap,
 ParameterLookup parameterLookup)

StandardEvaluationContext

public StandardEvaluationContext(ValueLookup valueLookup,
 Map<String,String> stateMap,
 ParameterLookup parameterLookup)

Method Details

getExpressionValue

public String getExpressionValue(String name)

Description copied from interface: EvaluationContext

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

Specified by:

getExpressionValue in interface EvaluationContext

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

public Set<String> getExpressionKeys()

Description copied from interface: EvaluationContext

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

Specified by:

getExpressionKeys in interface EvaluationContext

Returns:

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

getState

public String getState(String key)

Specified by:

getState in interface EvaluationContext

getParameter

public Parameter getParameter(String parameterName)

Specified by:

getParameter in interface EvaluationContext

getEvaluatorState

public EvaluatorState getEvaluatorState()

Specified by:

getEvaluatorState in interface EvaluationContext