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products/Sources/formale Sprachen/Java/Openjdk/src/demo/share/jfc/SwingSet2/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 5 kB

Quelle ExampleFileView.java Sprache: JAVA

/*
*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*
*   - Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*
*   - Neither the name of Oracle nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

import javax.swing.*;
import javax.swing.filechooser.*;

import java.io.File;
import java.util.Hashtable;

/**
* A convenience implementation of the FileView interface that
* manages name, icon, traversable, and file type information.
*
* This this implemention will work well with file systems that use
* "dot" extensions to indicate file type. For example: "picture.gif"
* as a gif image.
*
* If the java.io.File ever contains some of this information, such as
* file type, icon, and hidden file inforation, this implementation may
* become obsolete. At minimum, it should be rewritten at that time to
* use any new type information provided by java.io.File
*
* Example:
*    JFileChooser chooser = new JFileChooser();
*    fileView = new ExampleFileView();
*    fileView.putIcon("jpg", new ImageIcon("images/jpgIcon.jpg"));
*    fileView.putIcon("gif", new ImageIcon("images/gifIcon.gif"));
*    chooser.setFileView(fileView);
*
* @author Jeff Dinkins
*/
public class ExampleFileView extends FileView {
    private Hashtable<String, Icon> icons = new Hashtable<>(5);
    private Hashtable<File, String> fileDescriptions = new Hashtable<>(5);
    private Hashtable<String, String> typeDescriptions = new Hashtable<>(5);

    /**
     * The name of the file.  Do nothing special here. Let
     * the system file view handle this.
     * @see FileView#getName
     */
    public String getName(File f) {
        return null;
    }

    /**
     * Adds a human readable description of the file.
     */
    public void putDescription(File f, String fileDescription) {
        fileDescriptions.put(f, fileDescription);
    }

    /**
     * A human readable description of the file.
     *
     * @see FileView#getDescription
     */
    public String getDescription(File f) {
        return fileDescriptions.get(f);
    };

    /**
     * Adds a human readable type description for files. Based on "dot"
     * extension strings, e.g: ".gif". Case is ignored.
     */
    public void putTypeDescription(String extension, String typeDescription) {
        typeDescriptions.put(extension, typeDescription);
    }

    /**
     * Adds a human readable type description for files of the type of
     * the passed in file. Based on "dot" extension strings, e.g: ".gif".
     * Case is ignored.
     */
    public void putTypeDescription(File f, String typeDescription) {
        putTypeDescription(getExtension(f), typeDescription);
    }

    /**
     * A human readable description of the type of the file.
     *
     * @see FileView#getTypeDescription
     */
    public String getTypeDescription(File f) {
        return typeDescriptions.get(getExtension(f));
    }

    /**
     * Convenience method that returns the "dot" extension for the
     * given file.
     */
    public String getExtension(File f) {
        String name = f.getName();
        if(name != null) {
            int extensionIndex = name.lastIndexOf('.');
            if(extensionIndex < 0) {
                return null;
            }
            return name.substring(extensionIndex+1).toLowerCase();
        }
        return null;
    }

    /**
     * Adds an icon based on the file type "dot" extension
     * string, e.g: ".gif". Case is ignored.
     */
    public void putIcon(String extension, Icon icon) {
        icons.put(extension, icon);
    }

    /**
     * Icon that reperesents this file. Default implementation returns
     * null. You might want to override this to return something more
     * interesting.
     *
     * @see FileView#getIcon
     */
    public Icon getIcon(File f) {
        Icon icon = null;
        String extension = getExtension(f);
        if(extension != null) {
            icon = icons.get(extension);
        }
        return icon;
    }

    /**
     * Whether the directory is traversable or not. Generic implementation
     * returns true for all directories and special folders.
     *
     * You might want to subtype ExampleFileView to do somethimg more interesting,
     * such as recognize compound documents directories; in such a case you might
     * return a special icon for the directory that makes it look like a regular
     * document, and return false for isTraversable to not allow users to
     * descend into the directory.
     *
     * @see FileView#isTraversable
     */
    public Boolean isTraversable(File f) {
        // if (some_reason) {
        //    return Boolean.FALSE;
        // }
        return null;    // Use default from FileSystemView
    };

}

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