Method dereference

etc/future/scanner/InboundVariable.java:84–117

Attempt to de-reference an inbound variable. We try de-referencing as soon as possible (why? there is a good reason for it, it fixes some bug, but I can't remember what right now) However the referenced variable may not exist yet, so the de-referencing may fail, requiring us to have another go later

()

     * @throws ConversionException If cross-references don't add up
     */
    public void dereference() throws ConversionException
    {
        int maxDepth = 0;

        while (ProtocolConstants.TYPE_REFERENCE.equals(type))
        {
            InboundVariable cd = context.getInboundVariable(formField.getString());
            if (cd == null)
            {
                throw new ConversionException(getClass(), "Found reference to variable named '" + formField.getString() + "', but no variable of that name could be found.");
            }

            type = cd.type;
            formField = cd.getFormField();

            // For some reason we used to leave this until the loop finished
            // and then only set it if the key was null. I think this logic
            // may have been broken by named objects
            key = cd.key;

            maxDepth++;
            if (maxDepth > 20)
            {
                throw new ConversionException(getClass(), "Max depth exceeded when dereferencing " + formField.getString());
            }
        }

        // For references without an explicit variable name, we use the
        // name of the thing they point at
        // if (key == null)
        // {
        //     key = formField.getString();
        // }
    }

    /**
     * @return Returns the lookup table.