IModel Apache Wicket 在哪里检索对象?
首先,请看一下本示例中如何使用 IModel:
@SuppressWarnings("serial")
public static List<IColumn> getTableColumns(
final ReportParams reportParams, final boolean columnsSortable
) {
List<IColumn> columns = new ArrayList<IColumn>();
final Map<String,ToolInfo> eventIdToolMap = Locator.getFacade().getEventRegistryService().getEventIdToolMap();
// site
if(Locator.getFacade().getReportManager().isReportColumnAvailable(reportParams, StatsManager.T_SITE)) {
columns.add(new PropertyColumn(new ResourceModel("th_site"), columnsSortable ? ReportsDataProvider.COL_SITE : null, ReportsDataProvider.COL_SITE) {
@Override
public void populateItem(Item item, String componentId, IModel model) {
final String site = ((Stat) model.getObject()).getSiteId();
String lbl = "", href = "";
Site s = null;
try{
s = Locator.getFacade().getSiteService().getSite(site);
lbl = s.getTitle();
href = s.getUrl();
}catch(IdUnusedException e){
lbl = (String) new ResourceModel("site_unknown").getObject();
href = null;
}
item.add(new ImageWithLink(componentId, null, href, lbl, "_parent"));
}
});
}
我的问题是:
populateItem 如何获取 IModel 参数的输入?
我在此应用程序中找不到任何显式构造 IModel 对象的代码。我假设直接从数据库中的表检索对象是否正确?我之所以想到这一点,是因为该应用程序使用了映射 Hibernate。
First of all, please take a look at how IModel is used in this example:
@SuppressWarnings("serial")
public static List<IColumn> getTableColumns(
final ReportParams reportParams, final boolean columnsSortable
) {
List<IColumn> columns = new ArrayList<IColumn>();
final Map<String,ToolInfo> eventIdToolMap = Locator.getFacade().getEventRegistryService().getEventIdToolMap();
// site
if(Locator.getFacade().getReportManager().isReportColumnAvailable(reportParams, StatsManager.T_SITE)) {
columns.add(new PropertyColumn(new ResourceModel("th_site"), columnsSortable ? ReportsDataProvider.COL_SITE : null, ReportsDataProvider.COL_SITE) {
@Override
public void populateItem(Item item, String componentId, IModel model) {
final String site = ((Stat) model.getObject()).getSiteId();
String lbl = "", href = "";
Site s = null;
try{
s = Locator.getFacade().getSiteService().getSite(site);
lbl = s.getTitle();
href = s.getUrl();
}catch(IdUnusedException e){
lbl = (String) new ResourceModel("site_unknown").getObject();
href = null;
}
item.add(new ImageWithLink(componentId, null, href, lbl, "_parent"));
}
});
}
And my questions are:
How does populateItem get an input for IModel parameter?
I cannot find any code in this application, which explicitly constructs IModel object. Is it correct for me to assume that the object is retrieved directly from a table in the database? I'm thinking of this because Mapping Hibernate is used for this application.
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这些模型是使用您提供给 DataTable (DataTable 构造函数还将获取您的 IColumn 列表)。
IDataProvider 可以使用 Hibernate - 如果没有有关该实现的更多信息,很难说。
The models are created using the IDataProvider you provide to the DataTable (DataTable constructor will also take your IColumn List) .
The IDataProvider could use Hibernate - hard to say without having more information on that implementation.