Example usage for com.vaadin.shared ApplicationConstants APP_PROTOCOL_PREFIX

Introduction

In this page you can find the example usage for com.vaadin.shared ApplicationConstants APP_PROTOCOL_PREFIX.

Prototype

String APP_PROTOCOL_PREFIX

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Usage

From source file:org.lucidj.vaadinui.GlobalResourceHandlerEx.java

License:Apache License

@Override
public void register(Resource resource, ClientConnector ownerConnector) {
    // Business as usual
    super.register(resource, ownerConnector);

    // In order to show resources properly, we hook register() to filter
    // all ClassResources that can be transformed into BundleResources.
    // The trick is actually quite simple, we take the associatedClass and
    // use it to find out what bundle it belongs. With the source bundle,
    // getting the resource becomes a trivial bundle.getResource().

    // Do we need to override this resource?
    if (resource instanceof ClassResource) {
        // We use only explicit associatedClass, because the current UI available
        // on ClassResource may come from an unrelated bundle
        Class associated_class = (Class) get_object_field(resource, "associatedClass");
        String resource_name = (String) get_object_field(resource, "resourceName");

        // Is the magic possible??
        if (associated_class != null && resource_name != null) {
            // After super.register() we can retrieve the uri assigned internally
            String uri = super.getUri(ownerConnector, (ConnectorResource) resource);
            String path = uri.substring(ApplicationConstants.APP_PROTOCOL_PREFIX.length() - 1);

            // Now we can track the resource from uri down to its source bundle
            Bundle source_bundle = FrameworkUtil.getBundle(associated_class);
            path_to_resource.put(path, new BundleResource(source_bundle, resource_name));

            // Keep the linked connector allowing cleanup
            path_to_connector.put(path, ownerConnector);
        }//  w w  w . jav a 2s  . c  o  m
    }
}

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