BeanGridConfiguration.java 文件源码

@Bean
@Scope(scopeName = "prototype")
@SuppressWarnings("unchecked")
public <ITEM> Grid<ITEM> configureBeanGrid(DependencyDescriptor dependencyDescriptor) {
    logger.debug("Configuring Vaadin Grid as bean");

    long timestamp = System.currentTimeMillis();

    ResolvableType injectionPointType = dependencyDescriptor.getResolvableType();
    if (!injectionPointType.hasGenerics()) {
        throw new IllegalStateException("Grid injection point is expected to declare a static item type");
    }

    ResolvableType genericType = injectionPointType.getGeneric();
    Class<ITEM> itemType = (Class<ITEM>) genericType.resolve();

    logger.debug("Vaadin Grid will use " + itemType.getCanonicalName() + " as item type");

    Grid<ITEM> grid = configureGridInstance(itemType);
    long configTime = System.currentTimeMillis() - timestamp;
    logger.debug("Done configuring Grid for " + itemType.getName() + " in " + configTime + "ms");

    return grid;
}