com.holonplatform.core

Interface Expression.ExpressionResolverFunction<E extends Expression,R extends Expression>

Type Parameters:

E - Expression type

R - Resolved expression type

All Known Subinterfaces:

DataTarget.DataTargetResolver<T>, ExpressionResolver<E,R>, QueryFilter.QueryFilterResolver<T>, QuerySort.QuerySortResolver<T>

All Known Implementing Classes:

CallbackExpressionResolver

Enclosing interface:

Expression

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface Expression.ExpressionResolverFunction<E extends Expression,R extends Expression>

A function to translate an Expression into another Expression type.

See Also:

ExpressionResolver

Method Summary

Modifier and Type	Method and Description
Optional<R>	resolve(E expression, ExpressionResolver.ResolutionContext context) Try to resolve given expression.

Method Detail

resolve

Optional<R> resolve(E expression,
                    ExpressionResolver.ResolutionContext context)
             throws Expression.InvalidExpressionException

Try to resolve given expression. If the resolver is not able to resolve given expression type, an empty Optional must be returned and the expression resolution engine should delegate the resolution to the next resolver, if available.

Concrete resolution environments could provide a more specialized ExpressionResolver.ResolutionContext interface.

Parameters:

expression - Expression to resolve

context - Resolution context

Returns:

Resolved expression, or an empty Optional if this resolver is not able to resolve given expression

Throws:

Expression.InvalidExpressionException - An error occurred during expression resolution