echopoint.tree
Class TreePath

java.lang.Object
  echopoint.tree.TreePath

All Implemented Interfaces:

java.io.Serializable

public class TreePath

extends java.lang.Object

implements java.io.Serializable

Represents a path to a node.

See Also:

Serialized Form

Constructor Summary

protected	TreePath() Primarily provided for subclasses that don't wish to use the path ivar.
	TreePath(java.lang.Object singlePath) Constructs a TreePath when there is only item in the path.
	TreePath(java.lang.Object[] path) Constructs a path from an array of Objects, uniquely identifying the path from the root of the tree to a specific node, as returned by the tree's data model.
protected	TreePath(java.lang.Object[] path, int length)
protected	TreePath(TreePath parent, java.lang.Object lastElement) Constructs a TreePath this is the combination of all the path elements in parent with a last path component of lastElement.

Method Summary

boolean	equals(java.lang.Object o) Tests two TreePaths for equality by checking each element of the paths for equality.
java.lang.Object	getLastPathComponent() Returns the last component of this path.
TreePath	getParentPath() Returns a path containing all the elements of the receiver, accept the last path component.
java.lang.Object[]	getPath() Returns an array of Objects containing the components of this TreePath.
java.lang.Object	getPathComponent(int element) Returns the path component at the specified index.
int	getPathCount() Returns the number of elements in the path.
int	hashCode() Returns the hashCode for the object.
boolean	isDescendant(TreePath aTreePath) Returns true if the specified node is a descendant of this TreePath.
TreePath	pathByAddingChild(java.lang.Object child) Returns a new path containing all the elements of this receiver plus child.
java.lang.String	toString() Returns a string that displays and identifies this object's properties.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TreePath

protected TreePath()

Primarily provided for subclasses that don't wish to use the path ivar. If a subclass uses this, it should also subclass getPath(), getPathCount(), getPathComponent() and possibly equals.

TreePath

public TreePath(java.lang.Object[] path)

Constructs a path from an array of Objects, uniquely identifying the path from the root of the tree to a specific node, as returned by the tree's data model.

The model is free to return an array of any Objects it needs to represent the path. The DefaultTreeModel returns an array of TreeNode objects. The first TreeNode in the path is the root of the tree, the last TreeNode is the node identified by the path.

Parameters:

path - an array of Objects representing the path to a node

TreePath

protected TreePath(java.lang.Object[] path,
                   int length)

TreePath

protected TreePath(TreePath parent,
                   java.lang.Object lastElement)

Constructs a TreePath this is the combination of all the path elements in parent with a last path component of lastElement.

TreePath

public TreePath(java.lang.Object singlePath)

Constructs a TreePath when there is only item in the path.

Method Detail

equals

public boolean equals(java.lang.Object o)

Tests two TreePaths for equality by checking each element of the paths for equality.

Parameters:

o - the Object to compare

getLastPathComponent

public java.lang.Object getLastPathComponent()

Returns the last component of this path. For a path returned by the DefaultTreeModel, that is the TreeNode object for the node specified by the path.

Returns:

the Object at the end of the path

getParentPath

public TreePath getParentPath()

Returns a path containing all the elements of the receiver, accept the last path component.

getPath

public java.lang.Object[] getPath()

Returns an array of Objects containing the components of this TreePath.

Returns:

an array of Objects representing the TreePath

getPathComponent

public java.lang.Object getPathComponent(int element)

Returns the path component at the specified index.

Parameters:

element - an int specifying an element in the path, where 0 is the first element in the path

Returns:

the Object at that index location

Throws:

java.lang.IllegalArgumentException - if the index is beyond the length of the path

getPathCount

public int getPathCount()

Returns the number of elements in the path.

Returns:

an int giving a count of items the path

hashCode

public int hashCode()

Returns the hashCode for the object. The hash code of a TreePath is defined to be the hash code of the last component in the path.

Returns:

the hashCode for the object

isDescendant

public boolean isDescendant(TreePath aTreePath)

Returns true if the specified node is a descendant of this TreePath. A TreePath, child, is a descendent of another TreePath, parent, if child contains all of the components that make up parent's path.

Returns:

true if aTreePath is a descendant of the receiver.

pathByAddingChild

public TreePath pathByAddingChild(java.lang.Object child)

Returns a new path containing all the elements of this receiver plus child. This will throw a NullPointerException if child is null.

toString

public java.lang.String toString()

Returns a string that displays and identifies this object's properties.

Returns:

a String representation of this object