com.helger.commons.parent.impl

Class ChildrenProviderHasChildren<CHILDTYPE extends IHasChildren<CHILDTYPE>>

java.lang.Object

com.helger.commons.parent.impl.ChildrenProviderHasChildren<CHILDTYPE>

Type Parameters:

CHILDTYPE - The data type of the child objects.

All Implemented Interfaces:

IChildrenProvider<CHILDTYPE>

Direct Known Subclasses:

AbstractChildrenProviderWithUniqueIDHasChildren, ChildrenProviderHasChildrenSorted, ChildrenProviderHasChildrenSorting, ChildrenProviderHasChildrenWithID

public class ChildrenProviderHasChildren<CHILDTYPE extends IHasChildren<CHILDTYPE>>
extends Object
implements IChildrenProvider<CHILDTYPE>

A standard implementation of the IChildrenProvider interface that works with all types that implement IHasChildren.

Author:

Philip Helger

Constructor Summary

Constructors

Constructor and Description
ChildrenProviderHasChildren()

Method Summary

Modifier and Type	Method and Description
int	getChildCount(CHILDTYPE aCurrent)
Collection<? extends CHILDTYPE>	getChildren(CHILDTYPE aCurrent) Get the children of the passed object.
boolean	hasChildren(CHILDTYPE aCurrent) Check if an item has children.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChildrenProviderHasChildren

public ChildrenProviderHasChildren()

Method Detail

hasChildren

public final boolean hasChildren(@Nullable
                                 CHILDTYPE aCurrent)

Description copied from interface: IChildrenProvider

Check if an item has children.

Specified by:

hasChildren in interface IChildrenProvider<CHILDTYPE extends IHasChildren<CHILDTYPE>>

Parameters:

aCurrent - The object to determine the children of. No null or non- null constraint possible.

Returns:

true if this item has children, false otherwise.

getChildCount

@Nonnegative
public final int getChildCount(@Nullable
                                             CHILDTYPE aCurrent)

Specified by:

getChildCount in interface IChildrenProvider<CHILDTYPE extends IHasChildren<CHILDTYPE>>

Parameters:

aCurrent - The object to determine the children count of. No null or non- null constraint possible.

Returns:

The number of contained direct children. Always ≥ 0.

getChildren

@Nullable
public Collection<? extends CHILDTYPE> getChildren(@Nullable
                                                              CHILDTYPE aCurrent)

Description copied from interface: IChildrenProvider

Get the children of the passed object.

Specified by:

getChildren in interface IChildrenProvider<CHILDTYPE extends IHasChildren<CHILDTYPE>>

Parameters:

aCurrent - The object to determine the children of. No null or non- null constraint possible.

Returns:

The child objects, or null if there are no children. If null is passed, the resolver is expected to return any possible top level (root) elements. This method may NOT return null if the call to IChildrenProvider.hasChildren(Object) with the same object returned true.