We use cookies to serve our customers and website visitors in the best possible way. Cookies are used for the proper functioning of the website and for improving the user experience, monitoring visitor traffic and marketing purposes. By continuing to browse the site, you agree to our use of cookies. You can read more about cookies here.
com.vaadin.data.provider.
Interface HierarchicalDataProvider<T,F>
-
Type Parameters:
T- data typeF- filter typeAll Superinterfaces:
DataProvider<T,F>, Serializable
All Known Subinterfaces:
All Known Implementing Classes:
AbstractBackEndHierarchicalDataProvider, AbstractHierarchicalDataProvider, TreeDataProvider
public interface HierarchicalDataProvider<T,F> extends DataProvider<T,F>A common interface for fetching hierarchical data from a data source, such as an in-memory collection or a backend database.
Since:
8.1
Author:
Vaadin Ltd
-
-
Method Summary
All Methods Modifier and Type Method and Description default Stream<T>fetch(Query<T,F> query)Fetches data from this HierarchicalDataProvider using given
query.Stream<T>fetchChildren(HierarchicalQuery<T,F> query)Fetches data from this HierarchicalDataProvider using given
query.intgetChildCount(HierarchicalQuery<T,F> query)Get the number of immediate child data items for the parent item returned by a given query.
booleanhasChildren(T item)Check whether a given item has any children associated with it.
default intsize(Query<T,F> query)Get the number of immediate child data items for the parent item returned by a given query.
-
Methods inherited from interface com.vaadin.data.provider.DataProvider
addDataProviderListener, fromCallbacks, fromFilteringCallbacks, fromStream, getId, isInMemory, ofCollection, ofItems, refreshAll, refreshItem, withConfigurableFilter, withConfigurableFilter, withConvertedFilter
-
-
-
-
Method Detail
-
size
default int size(Query<T,F> query)Get the number of immediate child data items for the parent item returned by a given query.
Specified by:
sizein interfaceDataProvider<T,F>Parameters:
query- given query to request the count forReturns:
the count of child data items for the data item
HierarchicalQuery.getParent()Throws:
IllegalArgumentException- if the query is not of type HierarchicalQuery
-
fetch
default Stream<T> fetch(Query<T,F> query)Fetches data from this HierarchicalDataProvider using given
query. Only the immediate children ofHierarchicalQuery.getParent()will be returned.Specified by:
fetchin interfaceDataProvider<T,F>Parameters:
query- given query to request data withReturns:
a stream of data objects resulting from the query
Throws:
IllegalArgumentException- if the query is not of type HierarchicalQuery
-
getChildCount
int getChildCount(HierarchicalQuery<T,F> query)Get the number of immediate child data items for the parent item returned by a given query.
Parameters:
query- given query to request the count forReturns:
the count of child data items for the data item
HierarchicalQuery.getParent()
-
fetchChildren
Stream<T> fetchChildren(HierarchicalQuery<T,F> query)Fetches data from this HierarchicalDataProvider using given
query. Only the immediate children ofHierarchicalQuery.getParent()will be returned.Parameters:
query- given query to request data withReturns:
a stream of data objects resulting from the query
-
hasChildren
boolean hasChildren(T item)Check whether a given item has any children associated with it.
Parameters:
item- the item to check for childrenReturns:
whether the given item has children
-
-