org.apache.nifi.attribute.expression.language

Class CompiledExpression

java.lang.Object

org.apache.nifi.attribute.expression.language.CompiledExpression

All Implemented Interfaces:

Expression

public class CompiledExpression
extends Object
implements Expression

Field Summary

Fields

Modifier and Type	Field and Description
private Set<Evaluator<?>>	allEvaluators
private String	expression
private Evaluator<?>	rootEvaluator
private org.antlr.runtime.tree.Tree	tree

Constructor Summary

Constructors

Constructor and Description
CompiledExpression(String expression, Evaluator<?> rootEvaluator, org.antlr.runtime.tree.Tree tree, Set<Evaluator<?>> allEvaluators)

Method Summary

Modifier and Type	Method and Description
String	evaluate(EvaluationContext evaluationContext, AttributeValueDecorator decorator) Evaluates this Expression against the given variables, attribute decorator, and state variables
Set<Evaluator<?>>	getAllEvaluators()
String	getExpression()
Evaluator<?>	getRootEvaluator()
org.antlr.runtime.tree.Tree	getTree()

Methods inherited from class java.lang.Object

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

Field Detail

rootEvaluator

private final Evaluator<?> rootEvaluator

tree

private final org.antlr.runtime.tree.Tree tree

expression

private final String expression

allEvaluators

private final Set<Evaluator<?>> allEvaluators

Constructor Detail

CompiledExpression

public CompiledExpression(String expression,
                          Evaluator<?> rootEvaluator,
                          org.antlr.runtime.tree.Tree tree,
                          Set<Evaluator<?>> allEvaluators)

Method Detail

getRootEvaluator

public Evaluator<?> getRootEvaluator()

getTree

public org.antlr.runtime.tree.Tree getTree()

getExpression

public String getExpression()

getAllEvaluators

public Set<Evaluator<?>> getAllEvaluators()

evaluate

public String evaluate(EvaluationContext evaluationContext,
                       AttributeValueDecorator decorator)

Description copied from interface: Expression

Evaluates this Expression against the given variables, attribute decorator, and state variables

Specified by:

evaluate in interface Expression

Parameters:

evaluationContext - the context used to evaluate the Expression

decorator - decorator to decorate variable values

Returns:

the evaluated value