Java example source code file (FileView.java)

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Java - Java tags/keywords

boolean, fileview, gui, icon, string, swing

The FileView.java Java example source code

/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.filechooser;

import java.io.File;
import javax.swing.*;

/**
 * <code>FileView defines an abstract class that can be implemented
 * to provide the filechooser with UI information for a <code>File.
 * Each L&F <code>JFileChooserUI object implements this
 * class to pass back the correct icons and type descriptions specific to
 * that L&F. For example, the Microsoft Windows L&F returns the
 * generic Windows icons for directories and generic files.
 * Additionally, you may want to provide your own <code>FileView to
 * <code>JFileChooser to return different icons or additional
 * information using {@link javax.swing.JFileChooser#setFileView}.
 *
 * <p>
 *
 * <code>JFileChooser first looks to see if there is a user defined
 * <code>FileView, if there is, it gets type information from
 * there first. If <code>FileView returns null for
 * any method, <code>JFileChooser then uses the L&F specific
 * view to get the information.
 * So, for example, if you provide a <code>FileView class that
 * returns an <code>Icon for JPG files, and returns null
 * icons for all other files, the UI's <code>FileView will provide
 * default icons for all other files.
 *
 * <p>
 *
 * For an example implementation of a simple file view, see
 * <code>yourJDK/demo/jfc/FileChooserDemo/ExampleFileView.java.
 * For more information and examples see
 * <a
 href="http://docs.oracle.com/javase/tutorial/uiswing/components/filechooser.html">How to Use File Choosers</a>,
 * a section in <em>The Java Tutorial.
 *
 * @see javax.swing.JFileChooser
 *
 * @author Jeff Dinkins
 *
 */
public abstract class FileView {
    /**
     * The name of the file. Normally this would be simply
     * <code>f.getName().
     */
    public String getName(File f) {
        return null;
    };

    /**
     * A human readable description of the file. For example,
     * a file named <i>jag.jpg might have a description that read:
     * "A JPEG image file of James Gosling's face".
     */
    public String getDescription(File f) {
        return null;
    }

    /**
     * A human readable description of the type of the file. For
     * example, a <code>jpg file might have a type description of:
     * "A JPEG Compressed Image File"
     */
    public String getTypeDescription(File f) {
        return null;
    }

    /**
     * The icon that represents this file in the <code>JFileChooser.
     */
    public Icon getIcon(File f) {
        return null;
    }

    /**
     * Whether the directory is traversable or not. This might be
     * useful, for example, if you want a directory to represent
     * a compound document and don't want the user to descend into it.
     */
    public Boolean isTraversable(File f) {
        return null;
    }

}