protected void emitEventHandlers()

in tapestry-framework/src/org/apache/tapestry/form/Form.java [474:557]
61 lines of code
11 McCabe index (conditional complexity)

    protected void emitEventHandlers(IMarkupWriter writer, IRequestCycle cycle)
    {

        if (_events == null || _events.isEmpty())
            return;

        Body body = Body.get(cycle);

        if (body == null)
            throw new ApplicationRuntimeException(
                Tapestry.getMessage("Form.needs-body-for-event-handlers"),
                this,
                null,
                null);

        StringBuffer buffer = new StringBuffer();

        Iterator i = _events.entrySet().iterator();
        while (i.hasNext())
        {

            Map.Entry entry = (Map.Entry) i.next();
            FormEventType type = (FormEventType) entry.getKey();
            Object value = entry.getValue();

            buffer.append("document.");
            buffer.append(_name);
            buffer.append(".");
            buffer.append(type.getPropertyName());
            buffer.append(" = ");

            // The typical case; one event one event handler.  Easy enough.

            if (value instanceof String)
            {
                buffer.append(value.toString());
                buffer.append(";");
            }
            else
            {
                // Build a composite function in-place

                buffer.append("function ()\n{\n");

                boolean combineWithAnd = type.getCombineUsingAnd();

                List l = (List) value;
                int count = l.size();

                for (int j = 0; j < count; j++)
                {
                    String functionName = (String) l.get(j);

                    if (j > 0)
                    {

                        if (combineWithAnd)
                            buffer.append(" &&");
                        else
                            buffer.append(";");
                    }

                    buffer.append("\n  ");

                    if (combineWithAnd)
                    {
                        if (j == 0)
                            buffer.append("return ");
                        else
                            buffer.append("  ");
                    }

                    buffer.append(functionName);
                    buffer.append("()");
                }

                buffer.append(";\n}");
            }

            buffer.append("\n\n");
        }

        body.addInitializationScript(buffer.toString());
    }