org.graylog.plugins.pipelineprocessor.ast.expressions

Interface Expression

All Known Subinterfaces:

LogicalExpression, NumericExpression

All Known Implementing Classes:

AdditionExpression, AndExpression, ArrayLiteralExpression, BaseExpression, BinaryExpression, BooleanExpression, BooleanValuedFunctionWrapper, ComparisonExpression, ConstantExpression, DoubleExpression, EqualityExpression, FieldAccessExpression, FieldRefExpression, FunctionExpression, IndexedAccessExpression, LongExpression, MapLiteralExpression, MessageRefExpression, MultiplicationExpression, NotExpression, OrExpression, SignedExpression, StringExpression, UnaryExpression, VarRefExpression

public interface Expression

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Expression.Type

Method Summary

Modifier and Type	Method and Description
Iterable<Expression>	children()
default Object	evaluate(EvaluationContext context)
default Object	evaluateUnsafe() This method is allowed to throw exceptions and evaluates the expression in an empty context.
Object	evaluateUnsafe(EvaluationContext context) This method is allowed to throw exceptions.
org.antlr.v4.runtime.Token	getStartToken()
Class	getType()
boolean	isConstant()
default Expression.Type	nodeType()

Method Detail

isConstant

boolean isConstant()

getStartToken

org.antlr.v4.runtime.Token getStartToken()

evaluate

@Nullable
default Object evaluate(EvaluationContext context)

getType

Class getType()

evaluateUnsafe

@Nullable
Object evaluateUnsafe(EvaluationContext context)

This method is allowed to throw exceptions. The outside world is supposed to call evaluate instead.

evaluateUnsafe

default Object evaluateUnsafe()

This method is allowed to throw exceptions and evaluates the expression in an empty context. It is only useful for the interpreter/code generator to evaluate constant expressions to their effective value.

Returns:

the value of the expression in an empty context

children

Iterable<Expression> children()

nodeType

default Expression.Type nodeType()