public Set<String> catalogNames() {
		Set<String> catalogs = new HashSet<>();
		for (ResourceSelection selection : selections) {
			catalogs.add(selection.getCatalog());
		}
		return catalogs;
	}
public Set<String> catalogNames() {
		Set<String> catalogs = new HashSet<>();
		for (ResourceSelection selection : selections) {
			catalogs.add(selection.getCatalog());
		}
		return catalogs;
	}
public Set < String > catalogNames ( ) { Set < String > catalogs = new HashSet <> ( ) ; for ( ResourceSelection selection : selections ) { catalogs . add ( selection . getCatalog ( ) ) ; } return catalogs ; }
汇总得到所有资源仓库选择的类别信息。

@return 类别名称集合
汇总得到所有资源仓库选择的类别信息。