Examples of javax.el.LambdaExpression

javax.el.LambdaExpression

Encapsulates a parameterized {@link ValueExpression}.

A LambdaExpression is a representation of the EL Lambda expression syntax. It consists of a list of the formal parameters and a body, represented by a {@link ValueExpression}. The body can be any valid Expression, including another LambdaExpression.

A LambdaExpression is created when an EL expression containing a Lambda expression is evaluated.

A LambdaExpression can be invoked by calling {@link LambdaExpression#invoke}, with an {@link javax.el.ELContext} and a list of the actual arguments.Alternately, a LambdaExpression can be invoked without passing a ELContext, in which case the ELContext previously set by calling {@link LambdaExpression#setELContext} will be used.The evaluation of the ValueExpression in the body uses the {@link ELContext} to resolve references to the parameters, and to evaluatethe lambda expression. The result of the evaluation is returned.

@see ELContext#getLambdaArgument @see ELContext#enterLambdaScope @see ELContext#exitLambdaScope

                                    ctx.getFunctionMapper(),
                                    ctx.getVariableMapper(),
                                    null);
        List<String>parameters =
            ((AstLambdaParameters) this.children[0]).getParameters();
        LambdaExpression lambda = new LambdaExpression(parameters, expr);
        if (this.children.length <= 2) {
            return lambda;
        }


        // There are arguments following the lambda exprn, invoke it now.
        Object ret = null;
        for (int i = 2; i < this.children.length; i++) {
            if (ret != null) {
                if (!(ret instanceof LambdaExpression)) {
                    throw new ELException(MessageFactory.get(
                        "error.lambda.call"));
                }
                lambda = (LambdaExpression) ret;
            }
            AstMethodArguments args = (AstMethodArguments) this.children[i];
            ret = lambda.invoke(ctx, args.getParameters(ctx));
        }
        return ret;
    }

Examples of javax.el.LambdaExpression

Related Classes of javax.el.LambdaExpression