com.vaadin.data.util
Class HierarchicalContainer

java.lang.Object
  com.vaadin.data.util.AbstractContainer
      com.vaadin.data.util.AbstractInMemoryContainer<Object,Object,Item>
          com.vaadin.data.util.IndexedContainer
              com.vaadin.data.util.HierarchicalContainer

All Implemented Interfaces:

Container, Container.Filterable, Container.Hierarchical, Container.Indexed, Container.ItemSetChangeNotifier, Container.Ordered, Container.PropertySetChangeNotifier, Container.SimpleFilterable, Container.Sortable, Property.ValueChangeNotifier, Serializable, Cloneable

public class HierarchicalContainer
extends IndexedContainer
implements Container.Hierarchical

A specialized Container whose contents can be accessed like it was a tree-like structure.

Since:

3.0

Version:

6.8.18

Author:

Vaadin Ltd.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.vaadin.data.util.IndexedContainer

IndexedContainer.ItemSetChangeEvent

Nested classes/interfaces inherited from class com.vaadin.data.util.AbstractContainer

AbstractContainer.BaseItemSetChangeEvent, AbstractContainer.BasePropertySetChangeEvent

Nested classes/interfaces inherited from interface com.vaadin.data.Container

Container.Editor, Container.Filter, Container.Filterable, Container.Hierarchical, Container.Indexed, Container.ItemSetChangeEvent, Container.ItemSetChangeListener, Container.ItemSetChangeNotifier, Container.Ordered, Container.PropertySetChangeEvent, Container.PropertySetChangeListener, Container.PropertySetChangeNotifier, Container.SimpleFilterable, Container.Sortable, Container.Viewer

Constructor Summary

HierarchicalContainer()

Method Summary

Object	addItem() Creates a new Item into the Container, and assign it an automatic ID.
Item	addItem(Object itemId) Creates a new Item with the given ID in the Container.
boolean	areChildrenAllowed(Object itemId) Tests if the Item with given ID can have children.
protected boolean	doFilterContainer(boolean hasFilters) Filters the data in the container and updates internal data structures.
protected void	doSort() Perform the sorting of the data structures in the container.
protected void	fireItemSetChange(Container.ItemSetChangeEvent event) Sends an Item set change event to all registered interested listeners.
Collection<?>	getChildren(Object itemId) Gets the IDs of all Items that are children of the specified Item.
Object	getParent(Object itemId) Gets the ID of the parent Item of the specified Item.
boolean	hasChildren(Object itemId) Tests if the Item specified with itemId has child Items or if it is a leaf.
boolean	isIncludeParentsWhenFiltering() Used to control how filtering works.
boolean	isRoot(Object itemId) Tests if the Item specified with itemId is a root Item.
void	moveAfterSibling(Object itemId, Object siblingId) Moves a node (an Item) in the container immediately after a sibling node.
protected boolean	passesFilters(Object itemId) Checks if the given itemId passes the filters set for the container.
boolean	removeAllItems() Removes all Items from the Container.
boolean	removeItem(Object itemId) Removes the Item identified by ItemId from the Container.
static boolean	removeItemRecursively(Container.Hierarchical container, Object itemId) Removes the Item identified by given itemId and all its children from the given Container.
boolean	removeItemRecursively(Object itemId) Removes the Item identified by given itemId and all its children.
Collection<?>	rootItemIds() Gets the IDs of all Items in the container that don't have a parent.
boolean	setChildrenAllowed(Object itemId, boolean childrenAllowed) Sets the given Item's capability to have children.
void	setIncludeParentsWhenFiltering(boolean includeParentsWhenFiltering) Controls how the filtering of the container works.
boolean	setParent(Object itemId, Object newParentId) Sets the parent of an Item.

Methods inherited from class com.vaadin.data.util.IndexedContainer

addContainerFilter, addContainerFilter, addContainerProperty, addItemAfter, addItemAfter, addItemAt, addItemAt, addListener, addListener, clone, fireItemAdded, fireItemSetChange, getContainerProperty, getContainerPropertyIds, getItemSorter, getListeners, getSortableContainerPropertyIds, getType, getUnfilteredItem, registerNewItem, removeAllContainerFilters, removeContainerFilter, removeContainerFilters, removeContainerProperty, removeListener, removeListener, setItemSorter, sort

Methods inherited from class com.vaadin.data.util.AbstractInMemoryContainer

addFilter, addListener, containsId, filterAll, fireItemRemoved, firstItemId, getAllItemIds, getFilteredItemIds, getFilters, getIdByIndex, getItem, getItemIds, getSortablePropertyIds, getVisibleItemIds, indexOfId, internalAddItemAfter, internalAddItemAt, internalAddItemAtEnd, internalRemoveAllItems, internalRemoveItem, isFiltered, isFirstId, isLastId, isPropertyFiltered, lastItemId, nextItemId, prevItemId, removeAllFilters, removeFilter, removeFilters, removeListener, setAllItemIds, setFilteredItemIds, setFilters, size, sortContainer

Methods inherited from class com.vaadin.data.util.AbstractContainer

fireContainerPropertySetChange, fireContainerPropertySetChange, getItemSetChangeListeners, getPropertySetChangeListeners, setItemSetChangeListeners, setPropertySetChangeListeners

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.data.Container

addContainerProperty, containsId, getContainerProperty, getContainerPropertyIds, getItem, getItemIds, getType, removeContainerProperty, size

Methods inherited from interface com.vaadin.data.Container.Ordered

firstItemId, isFirstId, isLastId, lastItemId, nextItemId, prevItemId

Constructor Detail

HierarchicalContainer

public HierarchicalContainer()

Method Detail

areChildrenAllowed

public boolean areChildrenAllowed(Object itemId)

Description copied from interface: Container.Hierarchical

Tests if the Item with given ID can have children.

Specified by:

areChildrenAllowed in interface Container.Hierarchical

Parameters:

itemId - ID of the Item in the container whose child capability is to be tested

Returns:

true if the specified Item exists in the Container and it can have children, false if it's not found from the container or it can't have children.

getChildren

public Collection<?> getChildren(Object itemId)

Description copied from interface: Container.Hierarchical

Gets the IDs of all Items that are children of the specified Item. The returned collection is unmodifiable.

Specified by:

getChildren in interface Container.Hierarchical

Parameters:

itemId - ID of the Item whose children the caller is interested in

Returns:

An unmodifiable collection containing the IDs of all other Items that are children in the container hierarchy

getParent

public Object getParent(Object itemId)

Description copied from interface: Container.Hierarchical

Gets the ID of the parent Item of the specified Item.

Specified by:

getParent in interface Container.Hierarchical

Parameters:

itemId - ID of the Item whose parent the caller wishes to find out.

Returns:

the ID of the parent Item. Will be null if the specified Item is a root element.

hasChildren

public boolean hasChildren(Object itemId)

Description copied from interface: Container.Hierarchical

Tests if the Item specified with itemId has child Items or if it is a leaf. The Container.Hierarchical.getChildren(Object itemId) method always returns null for leaf Items.

Note that being a leaf does not imply whether or not an Item is allowed to have children.

.

Specified by:

hasChildren in interface Container.Hierarchical

Parameters:

itemId - ID of the Item to be tested

Returns:

true if the specified Item has children, false if not (is a leaf)

isRoot

public boolean isRoot(Object itemId)

Description copied from interface: Container.Hierarchical

Tests if the Item specified with itemId is a root Item. The hierarchical container can have more than one root and must have at least one unless it is empty. The Container.Hierarchical.getParent(Object itemId) method always returns null for root Items.

Specified by:

isRoot in interface Container.Hierarchical

Parameters:

itemId - ID of the Item whose root status is to be tested

Returns:

true if the specified Item is a root, false if not

rootItemIds

public Collection<?> rootItemIds()

Description copied from interface: Container.Hierarchical

Gets the IDs of all Items in the container that don't have a parent. Such items are called root Items. The returned collection is unmodifiable.

Specified by:

rootItemIds in interface Container.Hierarchical

Returns:

An unmodifiable collection containing IDs of all root elements of the container

setChildrenAllowed

public boolean setChildrenAllowed(Object itemId,
                                  boolean childrenAllowed)

Sets the given Item's capability to have children. If the Item identified with the itemId already has children and the areChildrenAllowed is false this method fails and false is returned; the children must be first explicitly removed with setParent(Object itemId, Object newParentId) or Container.removeItem(Object itemId).

Specified by:

setChildrenAllowed in interface Container.Hierarchical

Parameters:

itemId - the ID of the Item in the container whose child capability is to be set.

childrenAllowed - the boolean value specifying if the Item can have children or not.

Returns:

true if the operation succeeded, false if not

setParent

public boolean setParent(Object itemId,
                         Object newParentId)

Sets the parent of an Item. The new parent item must exist and be able to have children. (canHaveChildren(newParentId) == true). It is also possible to detach a node from the hierarchy (and thus make it root) by setting the parent null.

Specified by:

setParent in interface Container.Hierarchical

Parameters:

itemId - the ID of the item to be set as the child of the Item identified with newParentId.

newParentId - the ID of the Item that's to be the new parent of the Item identified with itemId.

Returns:

true if the operation succeeded, false if not

moveAfterSibling

public void moveAfterSibling(Object itemId,
                             Object siblingId)

Moves a node (an Item) in the container immediately after a sibling node. The two nodes must have the same parent in the container.

Parameters:

itemId - the identifier of the moved node (Item)

siblingId - the identifier of the reference node (Item), after which the other node will be located

addItem

public Object addItem()

Description copied from interface: Container

Creates a new Item into the Container, and assign it an automatic ID.

The new ID is returned, or null if the operation fails. After a successful call you can use the getItemmethod to fetch the Item.

This functionality is optional.

Specified by:

addItem in interface Container

Overrides:

addItem in class IndexedContainer

Returns:

ID of the newly created Item, or null in case of a failure

fireItemSetChange

protected void fireItemSetChange(Container.ItemSetChangeEvent event)

Description copied from class: AbstractContainer

Sends an Item set change event to all registered interested listeners.

Overrides:

fireItemSetChange in class AbstractContainer

Parameters:

event - the item set change event to send, optionally with additional information

addItem

public Item addItem(Object itemId)

Description copied from interface: Container

Creates a new Item with the given ID in the Container.

The new Item is returned, and it is ready to have its Properties modified. Returns null if the operation fails or the Container already contains a Item with the given ID.

This functionality is optional.

Specified by:

addItem in interface Container

Overrides:

addItem in class IndexedContainer

Parameters:

itemId - ID of the Item to be created

Returns:

Created new Item, or null in case of a failure

removeAllItems

public boolean removeAllItems()

Description copied from interface: Container

Removes all Items from the Container.

Note that Property ID and type information is preserved. This functionality is optional.

Specified by:

removeAllItems in interface Container

Overrides:

removeAllItems in class IndexedContainer

Returns:

true if the operation succeeded, false if not

removeItem

public boolean removeItem(Object itemId)

Description copied from interface: Container

Removes the Item identified by ItemId from the Container.

Containers that support filtering should also allow removing an item that is currently filtered out.

This functionality is optional.

Specified by:

removeItem in interface Container

Specified by:

removeItem in interface Container.Hierarchical

Overrides:

removeItem in class IndexedContainer

Parameters:

itemId - ID of the Item to remove

Returns:

true if the operation succeeded, false if not

removeItemRecursively

public boolean removeItemRecursively(Object itemId)

Removes the Item identified by given itemId and all its children.

Parameters:

itemId - the identifier of the Item to be removed

Returns:

true if the operation succeeded

See Also:

removeItem(Object)

removeItemRecursively

public static boolean removeItemRecursively(Container.Hierarchical container,
                                            Object itemId)

Removes the Item identified by given itemId and all its children from the given Container.

Parameters:

container - the container where the item is to be removed

itemId - the identifier of the Item to be removed

Returns:

true if the operation succeeded

doSort

protected void doSort()

Description copied from class: AbstractInMemoryContainer

Perform the sorting of the data structures in the container. This is invoked when the itemSorter has been prepared for the sort operation. Typically this method calls Collections.sort(aCollection, getItemSorter()) on all arrays (containing item ids) that need to be sorted.

Overrides:

doSort in class AbstractInMemoryContainer<Object,Object,Item>

isIncludeParentsWhenFiltering

public boolean isIncludeParentsWhenFiltering()

Used to control how filtering works. @see setIncludeParentsWhenFiltering(boolean) for more information.

Returns:

true if all parents for items that match the filter are included when filtering, false if only the matching items are included

setIncludeParentsWhenFiltering

public void setIncludeParentsWhenFiltering(boolean includeParentsWhenFiltering)

Controls how the filtering of the container works. Set this to true to make filtering include parents for all matched items in addition to the items themselves. Setting this to false causes the filtering to only include the matching items and make items with excluded parents into root items.

Parameters:

includeParentsWhenFiltering - true to include all parents for items that match the filter, false to only include the matching items

doFilterContainer

protected boolean doFilterContainer(boolean hasFilters)

Description copied from class: AbstractInMemoryContainer

Filters the data in the container and updates internal data structures. This method should reset any internal data structures and then repopulate them so AbstractInMemoryContainer.getItemIds() and other methods only return the filtered items.

Overrides:

doFilterContainer in class AbstractInMemoryContainer<Object,Object,Item>

Parameters:

hasFilters - true if filters has been set for the container, false otherwise

Returns:

true if the item set has changed as a result of the filtering

passesFilters

protected boolean passesFilters(Object itemId)

Description copied from class: AbstractInMemoryContainer

Checks if the given itemId passes the filters set for the container. The caller should make sure the itemId exists in the container. For non-existing itemIds the behavior is undefined.

Overrides:

passesFilters in class AbstractInMemoryContainer<Object,Object,Item>

Parameters:

itemId - An itemId that exists in the container.

Returns:

true if the itemId passes all filters or no filters are set, false otherwise.