com.vaadin.data.util.

Class ContainerHierarchicalWrapper

java.lang.Object
  com.vaadin.data.util.ContainerHierarchicalWrapper

All Implemented Interfaces:

Container, Container.Hierarchical, Container.ItemSetChangeNotifier, Container.PropertySetChangeNotifier, Serializable

extends Object
implements Container.Hierarchical, Container.ItemSetChangeNotifier, Container.PropertySetChangeNotifier

A wrapper class for adding external hierarchy to containers not implementing the Container.Hierarchical interface.

If the wrapped container is changed directly (that is, not through the wrapper), and does not implement Container.ItemSetChangeNotifier and/or Container.PropertySetChangeNotifier the hierarchy information must be updated with the updateHierarchicalWrapper() method.

Since:

3.0

Version:

6.8.18

Author:

Vaadin Ltd.

See Also:

Serialized Form

Nested Class Summary

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
`ContainerHierarchicalWrapper(Container toBeWrapped)` Constructs a new hierarchical wrapper for an existing Container.

Method Summary
`boolean`	`addContainerProperty(Object propertyId, Class<?> type, Object defaultValue)` Adds a new Property to all Items in the Container.
`Object`	`addItem()` Creates a new Item into the Container, assigns it an automatic ID, and adds it to the hierarchy.
`Item`	`addItem(Object itemId)` Adds a new Item by its ID to the underlying container and to the hierarchy.
`void`	`addListener(Container.ItemSetChangeListener listener)` Adds an Item set change listener for the object.
`void`	`addListener(Container.PropertySetChangeListener listener)` Registers a new Property set change listener for this Container.
`boolean`	`areChildrenAllowed(Object itemId)` Tests if the Item with given ID can have children.
`boolean`	`containsId(Object itemId)` Tests if the Container contains the specified Item.
`Collection<?>`	`getChildren(Object itemId)` Gets the IDs of all Items that are children of the specified Item.
`Property`	`getContainerProperty(Object itemId, Object propertyId)` Gets the Property identified by the given itemId and propertyId from the Container.
`Collection<?>`	`getContainerPropertyIds()` Gets the ID's of all Properties stored in the Container.
`Item`	`getItem(Object itemId)` Gets the `Item` with the given Item ID from the Container.
`Collection<?>`	`getItemIds()` Gets the ID's of all visible (after filtering and sorting) Items stored in the Container.
`Object`	`getParent(Object itemId)` Gets the ID of the parent Item of the specified Item.
`Class<?>`	`getType(Object propertyId)` Gets the data type of all Properties identified by the given Property ID.
`boolean`	`hasChildren(Object itemId)` Tests if the Item specified with `itemId` has child Items or if it is a leaf.
`boolean`	`isRoot(Object itemId)` Tests if the Item specified with `itemId` is a root Item.
`boolean`	`removeAllItems()` Removes all items from the underlying container and from the hierarcy.
`boolean`	`removeContainerProperty(Object propertyId)` Removes the specified Property from the underlying container and from the hierarchy.
`boolean`	`removeItem(Object itemId)` Removes an Item specified by the itemId from the underlying container and from the hierarchy.
`boolean`	`removeItemRecursively(Object itemId)` Removes the Item identified by given itemId and all its children.
`void`	`removeListener(Container.ItemSetChangeListener listener)` Removes the Item set change listener from the object.
`void`	`removeListener(Container.PropertySetChangeListener listener)` Removes a previously registered Property set change listener.
`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.
`boolean`	`setParent(Object itemId, Object newParentId)` Sets the parent of an Item.
`int`	`size()` Gets the number of visible Items in the Container.
`void`	`updateHierarchicalWrapper()` Updates the wrapper's internal hierarchy data to include all Items in the underlying container.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

ContainerHierarchicalWrapper

public ContainerHierarchicalWrapper(Container toBeWrapped)

Constructs a new hierarchical wrapper for an existing Container. Works even if the to-be-wrapped container already implements the Container.Hierarchical interface.

Parameters:: toBeWrapped - the container that needs to be accessed hierarchically
See Also:: updateHierarchicalWrapper()

Method Detail

updateHierarchicalWrapper

public void updateHierarchicalWrapper()

Updates the wrapper's internal hierarchy data to include all Items in the underlying container. If the contents of the wrapped container change without the wrapper's knowledge, this method needs to be called to update the hierarchy information of the Items.

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

addItem

public Object addItem()
               throws UnsupportedOperationException

Creates a new Item into the Container, assigns it an automatic ID, and adds it to the hierarchy.

Specified by:: addItem in interface Container

Returns:: the autogenerated ID of the new Item or null if the operation failed
Throws:: UnsupportedOperationException - if the addItem is not supported.

addItem

public Item addItem(Object itemId)
             throws UnsupportedOperationException

Adds a new Item by its ID to the underlying container and to the hierarchy.

Specified by:: addItem in interface Container

Parameters:: itemId - the ID of the Item to be created.
Returns:: the added Item or null if the operation failed.
Throws:: UnsupportedOperationException - if the addItem is not supported.

removeAllItems

public boolean removeAllItems()
                       throws UnsupportedOperationException

Removes all items from the underlying container and from the hierarcy.

Specified by:: removeAllItems in interface Container

Returns:: true if the operation succeeded, false if not
Throws:: UnsupportedOperationException - if the removeAllItems is not supported.

removeItem

public boolean removeItem(Object itemId)
                   throws UnsupportedOperationException

Removes an Item specified by the itemId from the underlying container and from the hierarchy.

Specified by:: removeItem in interface Container
Specified by:: removeItem in interface Container.Hierarchical

Parameters:: itemId - the ID of the Item to be removed.
Returns:: true if the operation succeeded, false if not
Throws:: UnsupportedOperationException - if the removeItem is not supported.

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)

addContainerProperty

public boolean addContainerProperty(Object propertyId,
                                    Class<?> type,
                                    Object defaultValue)
                             throws UnsupportedOperationException

Adds a new Property to all Items in the Container.

Specified by:: addContainerProperty in interface Container

Parameters:: propertyId - the ID of the new Property.; type - the Data type of the new Property.; defaultValue - the value all created Properties are initialized to.
Returns:: true if the operation succeeded, false if not
Throws:: UnsupportedOperationException - if the addContainerProperty is not supported.

removeContainerProperty

public boolean removeContainerProperty(Object propertyId)
                                throws UnsupportedOperationException

Removes the specified Property from the underlying container and from the hierarchy.

Note : The Property will be removed from all Items in the Container.

Specified by:: removeContainerProperty in interface Container

Parameters:: propertyId - the ID of the Property to remove.
Returns:: true if the operation succeeded, false if not
Throws:: UnsupportedOperationException - if the removeContainerProperty is not supported.