org.apache.jackrabbit.oak.plugins.tree

Class TreeLocation

java.lang.Object

org.apache.jackrabbit.oak.plugins.tree.TreeLocation

public abstract class TreeLocation
extends Object

A TreeLocation denotes a location inside a tree.

It can either refer to a inner node (that is a Tree), to a leaf (that is a PropertyState) or to an invalid location which refers to neither of the former. TreeLocation instances provide methods for navigating trees such that navigation always results in new TreeLocation instances. Navigation never fails. Errors are deferred until the underlying item itself is accessed. That is, if a TreeLocation points to an item which does not exist or is unavailable otherwise (i.e. due to access control restrictions) accessing the tree will return null at this point.

Constructor Summary

Constructors

Constructor and Description
TreeLocation()

Method Summary

Modifier and Type	Method and Description
static @NotNull TreeLocation	create(@NotNull Root root) Equivalent to create(root, "/")
static @NotNull TreeLocation	create(@NotNull Root root, @NotNull String path) Create a new TreeLocation instance for the item at the given path in root.
static @NotNull TreeLocation	create(@NotNull Tree tree) Create a new TreeLocation instance for a tree
abstract boolean	exists() Determine whether the underlying Tree or PropertyState for this TreeLocation is available.
@NotNull TreeLocation	getChild(String name) Navigate to a child of the given name.
abstract @NotNull String	getName() The name of this location
abstract @NotNull TreeLocation	getParent() Navigate to the parent or an invalid location for the root of the hierarchy.
abstract @NotNull String	getPath() The path of this location
@Nullable PropertyState	getProperty() Get the underlying PropertyState for this TreeLocation.
@Nullable Tree	getTree() Get the underlying Tree for this TreeLocation.
abstract boolean	remove() Remove the underlying item.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeLocation

public TreeLocation()

Method Detail

create

@NotNull
public static @NotNull TreeLocation create(@NotNull
                                                    @NotNull Tree tree)

Create a new TreeLocation instance for a tree

create

@NotNull
public static @NotNull TreeLocation create(@NotNull
                                                    @NotNull Root root,
                                                    @NotNull
                                                    @NotNull String path)

Create a new TreeLocation instance for the item at the given path in root.

create

@NotNull
public static @NotNull TreeLocation create(@NotNull
                                                    @NotNull Root root)

Equivalent to create(root, "/")

getParent

@NotNull
public abstract @NotNull TreeLocation getParent()

Navigate to the parent or an invalid location for the root of the hierarchy.

Returns:

a TreeLocation for the parent of this location.

exists

public abstract boolean exists()

Determine whether the underlying Tree or PropertyState for this TreeLocation is available.

Returns:

true if the underlying item is available and has not been disconnected.

See Also:

Tree.exists()

getName

@NotNull
public abstract @NotNull String getName()

The name of this location

Returns:

name

getPath

@NotNull
public abstract @NotNull String getPath()

The path of this location

Returns:

path

remove

public abstract boolean remove()

Remove the underlying item.

Returns:

true if the item was removed, false otherwise.

getChild

@NotNull
public @NotNull TreeLocation getChild(String name)

Navigate to a child of the given name.

Parameters:

name - name of the child

Returns:

this default implementation return a non existing location

getTree

@Nullable
public @Nullable Tree getTree()

Get the underlying Tree for this TreeLocation.

Returns:

this default implementation return null.

getProperty

@Nullable
public @Nullable PropertyState getProperty()

Get the underlying PropertyState for this TreeLocation.

Returns:

this default implementation return null.

toString

public String toString()

Overrides:

toString in class Object