private void checkForInvariant()

in tapestry-framework/src/org/apache/tapestry/binding/ExpressionBinding.java [427:501]
51 lines of code
10 McCabe index (conditional complexity)

    private void checkForInvariant(int start, String[] split)
    {
        // For now, all of our conditions are two properties
        // from a root component.

        if (split.length - start != 2)
            return;

        try
        {
            if (!Ognl.isSimpleNavigationChain(_parsedExpression, getOgnlContext()))
                return;
        }
        catch (OgnlException ex)
        {
            throw new BindingException(
                    Tapestry.format(
                            "ExpressionBinding.unable-to-resolve-expression",
                            _expression,
                            _root),
                    this,
                    ex);
        }

        String first = split[start];

        if (first.equals("listeners"))
        {
            _invariant = true;

            // Could cast to AbstractComponent, get listenersMap, etc.,
            // but this is easier.

            _cachedValue = resolveProperty();
            return;
        }

        if (first.equals("assets"))
        {
            String name = split[start + 1];

            _invariant = true;
            _cachedValue = _root.getAsset(name);
            return;
        }

        if (first.equals("beans"))
        {
            String name = split[start + 1];

            IBeanSpecification bs = _root.getSpecification().getBeanSpecification(name);

            if (bs == null || bs.getLifecycle() != BeanLifecycle.PAGE)
                return;

            // Again, could cast to AbstractComponent, but this
            // is easier.

            _invariant = true;
            _cachedValue = resolveProperty();
            return;
        }

        if (first.equals("bindings"))
        {
            String name = split[start + 1];

            _invariant = true;
            _cachedValue = _root.getBinding(name);
            return;
        }

        // Not a recognized pattern for conversion
        // to invariant.
    }