org.apache.commons.jexl3
Interface JexlExpression

All Known Implementing Classes:

Closure, Script, Script.Curried

public interface JexlExpression

Represents a single JEXL expression.

This simple interface provides access to the underlying textual expression through getSourceText().

An expression is different than a script - it is simply a reference to a single expression, not to multiple statements. This implies 'if','for','while','var' and blocks '{'... '}'are not allowed in expressions.

Do not create classes that implement this interface; delegate or compose instead.

Since:

1.0

evaluate

Object evaluate(JexlContext context)

Evaluates the expression with the variables contained in the supplied JexlContext.

Parameters:

context - A JexlContext containing variables.

Returns:

The result of this evaluation

Throws:

JexlException - on any error

getSourceText

String getSourceText()

Returns the source text of this expression.

Returns:

the source text

getParsedText

String getParsedText()

Recreates the source text of this expression from the internal syntactic tree.

Returns:

the source text

callable

Callable<Object> callable(JexlContext context)

Creates a Callable from this expression.

This allows to submit it to an executor pool and provides support for asynchronous calls.

The interpreter will handle interruption/cancellation gracefully if needed.

Parameters:

context - the context

Returns:

the callable

Since:

3.1