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allensoft.gui.treetable
Class FileSystemModel2  

java.lang.Object
  allensoft.gui.treetable.AbstractTreeTableModel
      allensoft.gui.treetable.FileSystemModel2

All Implemented Interfaces:

javax.swing.tree.TreeModel, TreeTableModel

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public class FileSystemModel2

extends AbstractTreeTableModel

FileSystemModel2 is a TreeTableModel representing a hierarchical file system.

This will recursively load all the children from the path it is created with. The loading is done with the method reloadChildren, and happens in another thread. The method isReloading can be invoked to check if there are active threads. The total size of all the files are also accumulated.

By default links are not descended. java.io.File does not have a way to distinguish links, so a file is assumed to be a link if its canonical path does not start with its parent path. This may not cover all cases, but works for the time being.

Reloading happens such that all the files of the directory are loaded and immediately available. The background thread then recursively loads all the files of each of those directories. When each directory has finished loading all its sub files they are attached and an event is generated in the event dispatching thread. A more ambitious approach would be to attach each set of directories as they are loaded and generate an event. Then, once all the direct descendants of the directory being reloaded have finished loading, it is resorted based on total size.

While you can invoke reloadChildren as many times as you want, care should be taken in doing this. You should not invoke reloadChildren on a node that is already being reloaded, or going to be reloaded (meaning its parent is reloading but it hasn't started reloading that directory yet). If this is done odd results may happen. FileSystemModel2 does not enforce any policy in this manner, and it is up to the user of FileSystemModel2 to ensure it doesn't happen.

Version:

1.12 05/12/98

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Nested Class Summary
(package private)  class	FileSystemModel2.FileNode           A FileNode is a derivative of the File class - though we delegate to the File object rather than subclassing it.
(package private)  class	FileSystemModel2.FileNodeLoader           FileNodeLoader can be used to reload all the children of a particular node.
(package private) static class	FileSystemModel2.SizeSorter           Sorts the contents, which must be instances of FileNode based on totalSize.

 

Field Summary
protected static java.lang.String[]	cNames
protected static java.lang.Class[]	cTypes
protected  boolean	descendLinks           Returns true if links are to be descended.
protected static FileSystemModel2.FileNode[]	EMPTY_CHILDREN
private static MergeSort	fileMS
protected  boolean	isValid           True if the receiver is valid, once set to false all Threads loading files will stop.
(package private)  int	reloadCount           > 0 indicates reloading some nodes.
protected  FileSystemModel2.FileNode	reloadNode           Node currently being reloaded, this becomes somewhat muddy if reloading is happening in multiple threads.
(package private) static java.util.Stack	sorters           An array of MergeSorter sorters, that will sort based on size.
static java.lang.Integer	ZERO

 

Fields inherited from class allensoft.gui.treetable.AbstractTreeTableModel

listenerList, root

 

Constructor Summary

FileSystemModel2()           Creates a FileSystemModel2 rooted at File.separator, which is usually the root of the file system.

FileSystemModel2(java.lang.String rootPath)           Creates a FileSystemModel2 with the root being rootPath.

 

Method Summary
java.lang.Object	getChild(java.lang.Object node, int i)           Returns the child of node at index i.
int	getChildCount(java.lang.Object node)           Returns the number of children of node.
protected  java.lang.Object[]	getChildren(java.lang.Object node)
java.lang.Class	getColumnClass(int column)           Returns the class for the particular column.
int	getColumnCount()           Returns the number of columns.
java.lang.String	getColumnName(int column)           Returns the name for a particular column.
boolean	getDescendsLinks()           Returns true if links are to be automatically descended.
protected  java.io.File	getFile(java.lang.Object node)
java.lang.Object	getNodeLoading()           Returns the node being loaded.
java.lang.String	getPath(java.lang.Object node)           Returns the path node represents.
javax.swing.tree.TreePath	getPathLoading()           Returns the path to the node that is being loaded.
protected static MergeSort	getSizeSorter()           Returns a MergeSort that can sort on the totalSize of a FileNode.
long	getTotalSize(java.lang.Object node)           Returns the total size of the receiver.
java.lang.Object	getValueAt(java.lang.Object node, int column)           Returns the value of the particular column.
boolean	isLeaf(java.lang.Object node)           Returns true if the passed in object represents a leaf, false otherwise.
boolean	isReloading()           Returns true if the receiver is loading any children.
protected static void	recycleSorter(MergeSort sorter)           Should be invoked when a MergeSort is no longer needed.
void	reloadChildren(java.lang.Object node)           Reloads the children of the specified node.
void	setDescendsLinks(boolean newValue)           If newValue is true, links are descended.
void	stopLoading()           Stops and waits for all threads to finish loading.

 

Methods inherited from class allensoft.gui.treetable.AbstractTreeTableModel

addTreeModelListener, fireTreeNodesChanged, fireTreeNodesInserted, fireTreeNodesRemoved, fireTreeStructureChanged, getIndexOfChild, getRoot, isCellEditable, removeTreeModelListener, setValueAt, valueForPathChanged

 

Methods inherited from class java.lang.Object

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

 

Field Detail

cNames

protected static java.lang.String[] cNames

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cTypes

protected static java.lang.Class[] cTypes

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ZERO

public static final java.lang.Integer ZERO

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sorters

static java.util.Stack sorters

An array of MergeSorter sorters, that will sort based on size.

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isValid

protected boolean isValid

True if the receiver is valid, once set to false all Threads loading files will stop.

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reloadNode

protected FileSystemModel2.FileNode reloadNode

Node currently being reloaded, this becomes somewhat muddy if reloading is happening in multiple threads.

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reloadCount

int reloadCount

> 0 indicates reloading some nodes.

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descendLinks

protected boolean descendLinks

Returns true if links are to be descended.

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EMPTY_CHILDREN

protected static FileSystemModel2.FileNode[] EMPTY_CHILDREN

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fileMS

private static MergeSort fileMS

Constructor Detail

FileSystemModel2

public FileSystemModel2()

Creates a FileSystemModel2 rooted at File.separator, which is usually the root of the file system. This does not load it, you should invoke reloadChildren with the root to start loading.

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FileSystemModel2

public FileSystemModel2(java.lang.String rootPath)

Creates a FileSystemModel2 with the root being rootPath. This does not load it, you should invoke reloadChildren with the root to start loading.

Method Detail

getSizeSorter

protected static MergeSort getSizeSorter()

Returns a MergeSort that can sort on the totalSize of a FileNode.

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recycleSorter

protected static void recycleSorter(MergeSort sorter)

Should be invoked when a MergeSort is no longer needed.

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getChildCount

public int getChildCount(java.lang.Object node)

Returns the number of children of node.

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getChild

public java.lang.Object getChild(java.lang.Object node,
                                 int i)

Returns the child of node at index i.

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isLeaf

public boolean isLeaf(java.lang.Object node)

Returns true if the passed in object represents a leaf, false otherwise.

Specified by:

isLeaf in interface javax.swing.tree.TreeModel

Overrides:

isLeaf in class AbstractTreeTableModel

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getColumnCount

public int getColumnCount()

Returns the number of columns.

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getColumnName

public java.lang.String getColumnName(int column)

Returns the name for a particular column.

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getColumnClass

public java.lang.Class getColumnClass(int column)

Returns the class for the particular column.

Specified by:

getColumnClass in interface TreeTableModel

Overrides:

getColumnClass in class AbstractTreeTableModel

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getValueAt

public java.lang.Object getValueAt(java.lang.Object node,
                                   int column)

Returns the value of the particular column.

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reloadChildren

public void reloadChildren(java.lang.Object node)

Reloads the children of the specified node.

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stopLoading

public void stopLoading()

Stops and waits for all threads to finish loading.

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setDescendsLinks

public void setDescendsLinks(boolean newValue)

If newValue is true, links are descended. Odd results may happen if you set this while other threads are loading.

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getDescendsLinks

public boolean getDescendsLinks()

Returns true if links are to be automatically descended.

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getPath

public java.lang.String getPath(java.lang.Object node)

Returns the path node represents.

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getTotalSize

public long getTotalSize(java.lang.Object node)

Returns the total size of the receiver.

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isReloading

public boolean isReloading()

Returns true if the receiver is loading any children.

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getPathLoading

public javax.swing.tree.TreePath getPathLoading()

Returns the path to the node that is being loaded.

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getNodeLoading

public java.lang.Object getNodeLoading()

Returns the node being loaded.

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getFile

protected java.io.File getFile(java.lang.Object node)

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getChildren

protected java.lang.Object[] getChildren(java.lang.Object node)

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> allensoft >> gui >> [ treetable overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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