com.vaadin.data.provider

Class TreeDataProvider<T>

java.lang.Object

com.vaadin.data.provider.AbstractDataProvider<T,F>

com.vaadin.data.provider.AbstractHierarchicalDataProvider<T,SerializablePredicate<T>>

com.vaadin.data.provider.TreeDataProvider<T>

Type Parameters:

T - data type

All Implemented Interfaces:

ConfigurableFilterDataProvider<T,SerializablePredicate<T>,SerializablePredicate<T>>, DataProvider<T,SerializablePredicate<T>>, HierarchicalDataProvider<T,SerializablePredicate<T>>, InMemoryDataProvider<T>, Serializable

public class TreeDataProvider<T>
extends AbstractHierarchicalDataProvider<T,SerializablePredicate<T>>
implements InMemoryDataProvider<T>

An in-memory data provider for listing components that display hierarchical data. Uses an instance of TreeData as its source of data.

Since:

8.1

Author:

Vaadin Ltd

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TreeDataProvider(TreeData<T> treeData) Constructs a new TreeDataProvider.

Method Summary

Modifier and Type	Method and Description
Stream<T>	fetchChildren(HierarchicalQuery<T,SerializablePredicate<T>> query) Fetches data from this HierarchicalDataProvider using given query.
int	getChildCount(HierarchicalQuery<T,SerializablePredicate<T>> query) Get the number of immediate child data items for the parent item returned by a given query.
SerializablePredicate<T>	getFilter() Gets the current filter of this data provider.
SerializableComparator<T>	getSortComparator() Gets the current sort comparator of this data provider.
TreeData<T>	getTreeData() Return the underlying hierarchical data of this provider.
boolean	hasChildren(T item) Check whether a given item has any children associated with it.
void	setFilter(SerializablePredicate<T> filter) Sets a filter to be applied to all queries.
void	setSortComparator(SerializableComparator<T> comparator) Sets the comparator to use as the default sorting for this data provider.
<C> DataProvider<T,C>	withConvertedFilter(SerializableFunction<C,SerializablePredicate<T>> filterConverter) Wraps this data provider to create a data provider that uses a different filter type.

Methods inherited from class com.vaadin.data.provider.AbstractDataProvider

addDataProviderListener, addListener, fireEvent, refreshAll, refreshItem

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.vaadin.data.provider.InMemoryDataProvider

addFilter, addFilter, addFilterByValue, addSortComparator, addSortOrder, clearFilters, filteringBy, filteringBy, filteringByEquals, filteringByPrefix, filteringByPrefix, filteringBySubstring, filteringBySubstring, isInMemory, setFilter, setFilterByValue, setSortOrder

Methods inherited from interface com.vaadin.data.provider.DataProvider

addDataProviderListener, fetch, fromCallbacks, fromFilteringCallbacks, fromStream, getId, ofCollection, ofItems, refreshAll, refreshItem, size, withConfigurableFilter, withConfigurableFilter

Methods inherited from interface com.vaadin.data.provider.HierarchicalDataProvider

fetch, size

Constructor Detail

TreeDataProvider

public TreeDataProvider(TreeData<T> treeData)

Constructs a new TreeDataProvider.

This data provider should be refreshed after making changes to the underlying TreeData instance.

Parameters:

treeData - the backing TreeData for this provider, not null

Method Detail

getTreeData

public TreeData<T> getTreeData()

Return the underlying hierarchical data of this provider.

Returns:

the underlying data of this provider

hasChildren

public boolean hasChildren(T item)

Description copied from interface: HierarchicalDataProvider

Check whether a given item has any children associated with it.

Specified by:

hasChildren in interface HierarchicalDataProvider<T,SerializablePredicate<T>>

Parameters:

item - the item to check for children

Returns:

whether the given item has children

getChildCount

public int getChildCount(HierarchicalQuery<T,SerializablePredicate<T>> query)

Description copied from interface: HierarchicalDataProvider

Get the number of immediate child data items for the parent item returned by a given query.

Specified by:

getChildCount in interface HierarchicalDataProvider<T,SerializablePredicate<T>>

Parameters:

query - given query to request the count for

Returns:

the count of child data items for the data item HierarchicalQuery.getParent()

fetchChildren

public Stream<T> fetchChildren(HierarchicalQuery<T,SerializablePredicate<T>> query)

Description copied from interface: HierarchicalDataProvider

Fetches data from this HierarchicalDataProvider using given query. Only the immediate children of HierarchicalQuery.getParent() will be returned.

Specified by:

fetchChildren in interface HierarchicalDataProvider<T,SerializablePredicate<T>>

Parameters:

query - given query to request data with

Returns:

a stream of data objects resulting from the query

getFilter

public SerializablePredicate<T> getFilter()

Description copied from interface: InMemoryDataProvider

Gets the current filter of this data provider.

Specified by:

getFilter in interface InMemoryDataProvider<T>

Returns:

the filter of this data provider

setFilter

public void setFilter(SerializablePredicate<T> filter)

Description copied from interface: InMemoryDataProvider

Sets a filter to be applied to all queries. The filter replaces any filter that has been set or added previously.

Specified by:

setFilter in interface ConfigurableFilterDataProvider<T,SerializablePredicate<T>,SerializablePredicate<T>>

Specified by:

setFilter in interface InMemoryDataProvider<T>

Parameters:

filter - the filter to set, or null to remove any set filters

See Also:

InMemoryDataProvider.setFilter(ValueProvider, SerializablePredicate), InMemoryDataProvider.setFilterByValue(ValueProvider, Object), InMemoryDataProvider.addFilter(SerializablePredicate)

getSortComparator

public SerializableComparator<T> getSortComparator()

Description copied from interface: InMemoryDataProvider

Gets the current sort comparator of this data provider.

Specified by:

getSortComparator in interface InMemoryDataProvider<T>

Returns:

the sort comparator of this data provider

setSortComparator

public void setSortComparator(SerializableComparator<T> comparator)

Description copied from interface: InMemoryDataProvider

Sets the comparator to use as the default sorting for this data provider. This overrides the sorting set by any other method that manipulates the default sorting of this data provider.

The default sorting is used if the query defines no sorting. The default sorting is also used to determine the ordering of items that are considered equal by the sorting defined in the query.

Specified by:

setSortComparator in interface InMemoryDataProvider<T>

Parameters:

comparator - a comparator to use, or null to clear any previously set sort order

See Also:

InMemoryDataProvider.setSortOrder(ValueProvider, SortDirection), InMemoryDataProvider.addSortComparator(SerializableComparator)

withConvertedFilter

public <C> DataProvider<T,C> withConvertedFilter(SerializableFunction<C,SerializablePredicate<T>> filterConverter)

Description copied from interface: DataProvider

Wraps this data provider to create a data provider that uses a different filter type. This can be used for adapting this data provider to a filter type provided by a Component such as ComboBox.

For example receiving a String from ComboBox and making a Predicate based on it:

 DataProvider<Person, Predicate<Person>> dataProvider;
 // ComboBox uses String as the filter type
 DataProvider<Person, String> wrappedProvider = dataProvider
         .withConvertedFilter(filterText -> {
             SerializablePredicate<Person> predicate = person -> person
                     .getName().startsWith(filterText);
             return predicate;
         });
 comboBox.setDataProvider(wrappedProvider);
 

Specified by:

withConvertedFilter in interface DataProvider<T,SerializablePredicate<T>>

Type Parameters:

C - the filter type that the wrapped data provider accepts; typically provided by a Component

Parameters:

filterConverter - callback that converts the filter in the query of the wrapped data provider into a filter supported by this data provider. Will only be called if the query contains a filter. Not null

Returns:

wrapped data provider, not null