org.jdesktop.swingx.treetable.FileSystemModel Maven / Gradle / Ivy
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/*
* $Id$
*
* Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
* Santa Clara, California 95054, U.S.A. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.jdesktop.swingx.treetable;
import java.io.File;
import java.util.Arrays;
import java.util.Date;
/**
* A tree table model to simulate a file system.
*
* This tree table model implementation extends {@code AbstractTreeTableModel}.
* The file system metaphor demonstrates that it is often easier to directly
* implement tree structures directly instead of using intermediaries, such as
* {@code TreeTableNode}.
*
* A comparison of this class with {@code SimpleFileSystemModel}, shows that
* extending {@code AbstractTreeTableModel} is often easier than creating a model
* from scratch.
*
* A "full" version of this model might allow editing of file names, the
* deletion of files, and the movement of files. This simple implementation does
* not intend to tackle such problems, but this implementation may be extended
* to handle such details.
*
* @author Ramesh Gupta
* @author Karl Schaefer
*/
public class FileSystemModel extends AbstractTreeTableModel {
// The the returned file length for directories.
private static final Long DIRECTORY = 0L;
/**
* Creates a file system model using the root directory as the model root.
*/
public FileSystemModel() {
this(new File(File.separator));
}
/**
* Creates a file system model using the specified {@code root}.
*
* @param root
* the root for this model; this may be different than the root
* directory for a file system.
*/
public FileSystemModel(File root) {
super(root);
}
private boolean isValidFileNode(Object file) {
boolean result = false;
if (file instanceof File) {
File f = (File) file;
while (!result && f != null) {
result = f.equals(root);
f = f.getParentFile();
}
}
return result;
}
/**
* {@inheritDoc}
*/
@Override
public File getChild(Object parent, int index) {
if (!isValidFileNode(parent)) {
throw new IllegalArgumentException("parent is not a file governed by this model");
}
File parentFile = (File) parent;
String[] children = parentFile.list();
if (children != null) {
return new File(parentFile, children[index]);
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public int getChildCount(Object parent) {
if (parent instanceof File) {
String[] children = ((File) parent).list();
if (children != null) {
return children.length;
}
}
return 0;
}
/**
* {@inheritDoc}
*/
@Override
public Class getColumnClass(int column) {
switch (column) {
case 0:
return String.class;
case 1:
return Long.class;
case 2:
return Boolean.class;
case 3:
return Date.class;
default:
return super.getColumnClass(column);
}
}
@Override
public int getColumnCount() {
return 4;
}
@Override
public String getColumnName(int column) {
switch (column) {
case 0:
return "Name";
case 1:
return "Size";
case 2:
return "Directory";
case 3:
return "Modification Date";
default:
return super.getColumnName(column);
}
}
@Override
public Object getValueAt(Object node, int column) {
if (node instanceof File) {
File file = (File) node;
switch (column) {
case 0:
return file.getName();
case 1:
return isLeaf(node) ? file.length() : DIRECTORY;
case 2:
return file.isDirectory();
case 3:
return new Date(file.lastModified());
}
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public int getIndexOfChild(Object parent, Object child) {
if (parent instanceof File && child instanceof File) {
File parentFile = (File) parent;
File[] files = parentFile.listFiles();
Arrays.sort(files);
for (int i = 0, len = files.length; i < len; i++) {
if (files[i].equals(child)) {
return i;
}
}
}
return -1;
}
/**
* {@inheritDoc}
*/
@Override
public File getRoot() {
return (File) root;
}
/**
* Sets the root for this tree table model. This method will notify
* listeners that a change has taken place.
*
* @param root
* the new root node to set
*/
public void setRoot(File root) {
this.root = root;
modelSupport.fireNewRoot();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isLeaf(Object node) {
if (node instanceof File) {
//do not use isFile(); some system files return false
return ((File) node).list() == null;
}
return true;
}
}