src/demo/share/jfc/FileChooserDemo/ExampleFileSystemView.java

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/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */



import java.io.File;
import java.io.IOException;
import javax.swing.filechooser.FileSystemView;


/**
 * This is a simple example that uses the FileSystemView class.
 * You can provide a superclass of the FileSystemView class with your own functionality.
 *
 * @author Pavel Porvatov
 */
public class ExampleFileSystemView extends FileSystemView {

    /**
     * Creates a new folder with the default name "New folder". This method is invoked
     * when the user presses the "New folder" button.
     */
    public File createNewFolder(File containingDir) throws IOException {
        File result = new File(containingDir, "New folder");

        if (result.exists()) {
            throw new IOException("Directory 'New folder' exists");
        }

        if (!result.mkdir()) {
            throw new IOException("Cannot create directory");
        }

        return result;
    }

    /**
     * Returns a list which appears in a drop-down list of the FileChooser component.
     * In this implementation only the home directory is returned.
     */
    @Override
    public File[] getRoots() {
        return new File[] { getHomeDirectory() };
    }

    /**
     * Returns a string that represents a directory or a file in the FileChooser component.
     * A string with all upper case letters is returned for a directory.
     * A string with all lower case letters is returned for a file.
     */
    @Override
    public String getSystemDisplayName(File f) {
        String displayName = super.getSystemDisplayName(f);

        return f.isDirectory() ? displayName.toUpperCase() : displayName.
                toLowerCase();
    }
}