org.apache.jackrabbit.core

Class CachingHierarchyManager

java.lang.Object

org.apache.jackrabbit.core.HierarchyManagerImpl

org.apache.jackrabbit.core.CachingHierarchyManager

All Implemented Interfaces:

HierarchyManager, ItemStateListener, NodeStateListener

public class CachingHierarchyManager
extends HierarchyManagerImpl
implements NodeStateListener

Implementation of a HierarchyManager that caches paths of items.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.jackrabbit.core.HierarchyManagerImpl

HierarchyManagerImpl.CycleDetector

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_UPPER_LIMIT Default upper limit of cached states

Fields inherited from class org.apache.jackrabbit.core.HierarchyManagerImpl

provider, rootNodeId

Constructor Summary

Constructors

Constructor and Description
CachingHierarchyManager(NodeId rootNodeId, ItemStateManager provider) Create a new instance of this class.

Method Summary

Modifier and Type	Method and Description
protected void	buildPath(PathBuilder builder, ItemState state, HierarchyManagerImpl.CycleDetector detector) Adds the path element of an item id to the path currently being built.
void	enableConsistencyChecks(boolean enable) Enable or disable consistency checks in this instance.
int	getDepth(ItemId id) Returns the depth of the specified item which is equivalent to getPath(id).getAncestorCount().
Name	getName(ItemId id) Returns the name of the specified item.
Path	getPath(ItemId id) Returns the path to the given item.
boolean	isAncestor(NodeId nodeId, ItemId itemId) Determines whether the node with the specified nodeId is an ancestor of the item denoted by the given itemId.
void	nodeAdded(NodeState state, Name name, int index, NodeId id) Called when a child node has been added
void	nodeModified(NodeState modified) Called when a node has been modified, typically as a result of removal or addition of a child node.
void	nodeRemoved(NodeState state, Name name, int index, NodeId id) Called when a child node has been removed
void	nodesReplaced(NodeState state) Called when the children nodes were replaced by other nodes, typically as result of a reorder operation.
protected void	pathResolved(ItemId id, PathBuilder builder) Called by HierarchyManagerImpl.resolvePath(org.apache.jackrabbit.spi.Path.Element[], int, ItemId, int).
protected ItemId	resolvePath(Path path, int typesAllowed) Internal implementation of HierarchyManagerImpl.resolvePath(Path) that will either resolve to a node or a property.
void	stateCreated(ItemState created) Called when an ItemState has successfully been created (i.e.
void	stateDestroyed(ItemState destroyed) Called when an ItemState has successfully been removed (i.e.
void	stateDiscarded(ItemState discarded) Called when an ItemState has been discarded (i.e.
void	stateModified(ItemState modified) Called when an ItemState has successfully been modified (i.e.
String	toString() Dump contents of path map and elements included to a string.

Methods inherited from class org.apache.jackrabbit.core.HierarchyManagerImpl

getChildNodeEntry, getChildNodeEntry, getItemState, getName, getParentId, getParentIds, getRelativeDepth, getRootNodeId, getShareRelativeDepth, hasItemState, isShareAncestor, resolveNodePath, resolvePath, resolvePath, resolvePropertyPath

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_UPPER_LIMIT

public static final int DEFAULT_UPPER_LIMIT

Default upper limit of cached states

See Also:

Constant Field Values

Constructor Detail

CachingHierarchyManager

public CachingHierarchyManager(NodeId rootNodeId,
                               ItemStateManager provider)

Create a new instance of this class.

Parameters:

rootNodeId - root node id

provider - item state manager

Method Detail

enableConsistencyChecks

public void enableConsistencyChecks(boolean enable)

Enable or disable consistency checks in this instance.

Parameters:

enable - true to enable consistency checks; false to disable

resolvePath

protected ItemId resolvePath(Path path,
                             int typesAllowed)
                      throws RepositoryException

Internal implementation of HierarchyManagerImpl.resolvePath(Path) that will either resolve to a node or a property. Should be overridden by a subclass that can resolve an intermediate path into an ItemId. This subclass can then invoke HierarchyManagerImpl.resolvePath(org.apache.jackrabbit.spi.Path.Element[], int, ItemId, int) with a value of next greater than 1.

Overrides:

resolvePath in class HierarchyManagerImpl

Parameters:

path - path to resolve

typesAllowed - one of RETURN_ANY, RETURN_NODE or RETURN_PROPERTY

Returns:

id or null

Throws:

RepositoryException - if an error occurs

pathResolved

protected void pathResolved(ItemId id,
                            PathBuilder builder)
                     throws MalformedPathException

Called by HierarchyManagerImpl.resolvePath(org.apache.jackrabbit.spi.Path.Element[], int, ItemId, int). May be overridden by some subclass to process/cache intermediate state.

Overrides:

pathResolved in class HierarchyManagerImpl

Parameters:

id - id of resolved item

builder - path builder containing path resolved

Throws:

MalformedPathException - if the path contained in builder is malformed

buildPath

protected void buildPath(PathBuilder builder,
                         ItemState state,
                         HierarchyManagerImpl.CycleDetector detector)
                  throws ItemStateException,
                         RepositoryException

Adds the path element of an item id to the path currently being built. Recursively invoked method that may be overridden by some subclass to either return cached responses or add response to cache. On exit, builder contains the path of state.

Overridden method tries to find a mapping for the intermediate item state and add its path elements to the builder currently being used. If no mapping is found, the item is cached instead after the base implementation has been invoked.

Overrides:

buildPath in class HierarchyManagerImpl

Parameters:

builder - builder currently being used

state - item to find path of

detector - path cycle detector

Throws:

ItemStateException

RepositoryException

getPath

public Path getPath(ItemId id)
             throws ItemNotFoundException,
                    RepositoryException

Returns the path to the given item.

Overridden method simply checks whether we have an item matching the id and returns its path, otherwise calls base implementation.

Specified by:

getPath in interface HierarchyManager

Overrides:

getPath in class HierarchyManagerImpl

Returns:

Throws:

ItemNotFoundException

RepositoryException

getName

public Name getName(ItemId id)
             throws ItemNotFoundException,
                    RepositoryException

Returns the name of the specified item.

Specified by:

getName in interface HierarchyManager

Overrides:

getName in class HierarchyManagerImpl

Parameters:

id - id of item whose name should be returned

Returns:

Throws:

ItemNotFoundException

RepositoryException

getDepth

public int getDepth(ItemId id)
             throws ItemNotFoundException,
                    RepositoryException

Returns the depth of the specified item which is equivalent to getPath(id).getAncestorCount(). The depth reflects the absolute hierarchy level.

Specified by:

getDepth in interface HierarchyManager

Overrides:

getDepth in class HierarchyManagerImpl

Parameters:

id - item id

Returns:

the depth of the specified item

Throws:

ItemNotFoundException - if the specified id does not denote an existing item.

RepositoryException - if another error occurs

isAncestor

public boolean isAncestor(NodeId nodeId,
                          ItemId itemId)
                   throws ItemNotFoundException,
                          RepositoryException

Determines whether the node with the specified nodeId is an ancestor of the item denoted by the given itemId. This is equivalent to getPath(nodeId).isAncestorOf(getPath(itemId)).

Specified by:

isAncestor in interface HierarchyManager

Overrides:

isAncestor in class HierarchyManagerImpl

Parameters:

nodeId - node id

itemId - item id

Returns:

true if the node with the specified nodeId is an ancestor of the item denoted by the given itemId; false otherwise

Throws:

ItemNotFoundException - if any of the specified id's does not denote an existing item.

RepositoryException - if another error occurs

stateCreated

public void stateCreated(ItemState created)

Called when an ItemState has successfully been created (i.e. its underlying persistent state was created).

Specified by:

stateCreated in interface ItemStateListener

Parameters:

created - the ItemState that has been 'created'

stateModified

public void stateModified(ItemState modified)

Called when an ItemState has successfully been modified (i.e. its underlying persistent state has changed).

Specified by:

stateModified in interface ItemStateListener

Parameters:

modified - the ItemState that has been 'modified'

nodeModified

public void nodeModified(NodeState modified)

Called when a node has been modified, typically as a result of removal or addition of a child node.

Please note, that this method is not called if ItemStateListener.stateModified(ItemState) was called. If path information is cached for modified, this iterates over all child nodes in the path map, evicting the ones that do not (longer) exist in the underlying NodeState.

Specified by:

nodeModified in interface NodeStateListener

Parameters:

modified - node state that changed

stateDestroyed

public void stateDestroyed(ItemState destroyed)

Called when an ItemState has successfully been removed (i.e. its underlying persistent state has been destroyed).

Specified by:

stateDestroyed in interface ItemStateListener

Parameters:

destroyed - the ItemState that has been 'destroyed'

stateDiscarded

public void stateDiscarded(ItemState discarded)

Called when an ItemState has been discarded (i.e. it has been rendered 'invalid').

Specified by:

stateDiscarded in interface ItemStateListener

Parameters:

discarded - the ItemState that has been discarded

See Also:

ItemState.discard()

nodeAdded

public void nodeAdded(NodeState state,
                      Name name,
                      int index,
                      NodeId id)

Called when a child node has been added

Specified by:

nodeAdded in interface NodeStateListener

Parameters:

state - node state that changed

name - name of node that was added

index - index of new node

id - id of new node

nodesReplaced

public void nodesReplaced(NodeState state)

Called when the children nodes were replaced by other nodes, typically as result of a reorder operation.

Iterate over all cached children of this state and verify each child's position.

Specified by:

nodesReplaced in interface NodeStateListener

Parameters:

state - node state that changed

nodeRemoved

public void nodeRemoved(NodeState state,
                        Name name,
                        int index,
                        NodeId id)

Called when a child node has been removed

Specified by:

nodeRemoved in interface NodeStateListener

Parameters:

state - node state that changed

name - name of node that was removed

index - index of removed node

id - id of removed node

toString

public String toString()

Dump contents of path map and elements included to a string.

Overrides:

toString in class Object