Package com.vaadin.flow.data.provider.hierarchy

Class HierarchicalQuery<T,F>

java.lang.Object

com.vaadin.flow.data.provider.Query<T,F>

com.vaadin.flow.data.provider.hierarchy.HierarchicalQuery<T,F>

Type Parameters:

T - bean type

F - filter type

All Implemented Interfaces:

Serializable

public class HierarchicalQuery<T,F>
extends Query<T,F>

Immutable hierarchical query object used to request data from a backend. Contains the parent node, index limits, sorting and filtering information.

Since:

1.2

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
HierarchicalQuery(int offset, int limit, List<QuerySortOrder> sortOrders, Comparator<T> inMemorySorting, F filter, T parent)	Constructs a new hierarchical query object with given offset, limit, sorting and filtering.
HierarchicalQuery(F filter, T parent)	Constructs a new hierarchical query object with given filter and parent node.

Method Summary

Modifier and Type	Method	Description
T	getParent()	Get the hierarchical parent object, where null corresponds to the root node.
Optional<T>	getParentOptional()	Get an Optional of the hierarchical parent object.

Methods inherited from class com.vaadin.flow.data.provider.Query

getFilter, getInMemorySorting, getLimit, getOffset, getPage, getPageSize, getRequestedRangeEnd, getSortingComparator, getSortOrders

Methods inherited from class java.lang.Object

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

Constructor Details

HierarchicalQuery

public HierarchicalQuery(F filter,
 T parent)

Constructs a new hierarchical query object with given filter and parent node.

Parameters:

filter - filtering for fetching; can be null

parent - the hierarchical parent object, null corresponding to the root node

HierarchicalQuery

public HierarchicalQuery(int offset,
 int limit,
 List<QuerySortOrder> sortOrders,
 Comparator<T> inMemorySorting,
 F filter,
 T parent)

Constructs a new hierarchical query object with given offset, limit, sorting and filtering.

Parameters:

offset - first index to fetch

limit - fetched item count

sortOrders - sorting order for fetching; used for sorting backends

inMemorySorting - comparator for sorting in-memory data

filter - filtering for fetching; can be null

parent - the hierarchical parent object, null corresponding to the root node

Method Details

getParent

public T getParent()

Get the hierarchical parent object, where null corresponds to the root node.

Returns:

the hierarchical parent object

getParentOptional

public Optional<T> getParentOptional()

Get an Optional of the hierarchical parent object.

Returns:

the result of getParent() wrapped by an Optional

See Also:

• getParent()