com.phloc.commons.parent

Interface IChildrenProvider<CHILDTYPE>

Type Parameters:

CHILDTYPE - The type of the children to retrieve.

All Known Subinterfaces:

IChildrenProviderSorted<CHILDTYPE>, IChildrenProviderWithID<KEYTYPE,CHILDTYPE>, IChildrenProviderWithUniqueID<KEYTYPE,CHILDTYPE>, IFolderTree<KEYTYPE,DATATYPE,COLLTYPE,ITEMTYPE>, ITreeWithGlobalUniqueID<KEYTYPE,DATATYPE,ITEMTYPE>

All Known Implementing Classes:

AbstractChildrenProviderWithUniqueIDHasChildren, BasicFolderTree, BasicTreeWithGlobalUniqueID, ChildrenProviderElementWithName, ChildrenProviderHasChildren, ChildrenProviderHasChildrenSorted, ChildrenProviderHasChildrenSorting, ChildrenProviderHasChildrenWithID, ChildrenProviderSorting, ChildrenProviderSortingWithID, ChildrenProviderSortingWithUniqueID, DefaultFolderTree, DefaultTreeWithGlobalUniqueID, FileSystemFolderTree

public interface IChildrenProvider<CHILDTYPE>

This interface can be used to generically resolved children of a certain object.

Author:

Philip Helger

Method Summary

Methods

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.

Method Detail

hasChildren

boolean hasChildren(CHILDTYPE aCurrent)

Check if an item has children.

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
int getChildCount(CHILDTYPE aCurrent)

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
Collection<? extends CHILDTYPE> getChildren(CHILDTYPE aCurrent)

Get the children of the passed object.

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 hasChildren(Object) with the same object returned true.