Method getTarget

java/org/apache/el/parser/AstValue.java:63–121

(EvaluationContext ctx)

    }

    private Target getTarget(EvaluationContext ctx) throws ELException {
        // evaluate expr-a to value-a
        Object base = this.children[0].getValue(ctx);

        // if our base is null (we know there are more properties to evaluate)
        if (base == null) {
            throw new PropertyNotFoundException(
                    MessageFactory.get("error.unreachable.base", this.children[0].getImage()));
        }

        // set up our start/end
        Object property = null;
        int propCount = this.jjtGetNumChildren();

        int i = 1;
        // Evaluate any properties or methods before our target
        ELResolver resolver = ctx.getELResolver();
        while (i < propCount) {
            if (i + 2 < propCount && this.children[i + 1] instanceof AstMethodParameters) {
                // Method call not at end of expression
                base = resolver.invoke(ctx, base, this.children[i].getValue(ctx), null,
                        ((AstMethodParameters) this.children[i + 1]).getParameters(ctx));
                i += 2;
            } else if (i + 2 == propCount && this.children[i + 1] instanceof AstMethodParameters) {
                // Method call at end of expression
                ctx.setPropertyResolved(false);
                property = this.children[i].getValue(ctx);
                if (property == null) {
                    throw new PropertyNotFoundException(
                            MessageFactory.get("error.unreachable.property", this.children[i].getImage()));
                }
                i += 2;
            } else if (i + 1 < propCount) {
                // Object with property not at end of expression
                property = this.children[i].getValue(ctx);
                ctx.setPropertyResolved(false);
                base = resolver.getValue(ctx, base, property);
                i++;
            } else {
                // Object with property at end of expression
                ctx.setPropertyResolved(false);
                property = this.children[i].getValue(ctx);
                if (property == null) {
                    throw new PropertyNotFoundException(
                            MessageFactory.get("error.unreachable.property", this.children[i].getImage()));
                }
                i++;
            }
            if (base == null) {
                throw new PropertyNotFoundException(
                        MessageFactory.get("error.unreachable.property", this.children[propCount - 1].getImage()));
            }
        }

        Target t = new Target();
        t.base = base;
        t.property = property;
        return t;