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JCommon is a free general purpose Java class library that is used in several projects at www.jfree.org, including JFreeChart and JFreeReport.
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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * 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 Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * -----------------
 * DetailEditor.java
 * -----------------
 * (C) Copyright 2004, by Thomas Morgner and Contributors.
 *
 * Original Author:  Thomas Morgner;
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: DetailEditor.java,v 1.3 2005/10/18 13:23:37 mungady Exp $
 *
 * Changes
 * -------
 * 07-Jun-2004 : Added JCommon header (DG);
 *
 */

package org.jfree.ui.tabbedui;

import javax.swing.JComponent;

/**
 * A detail editor.
 *
 * @author Thomas Morgner
 */
public abstract class DetailEditor extends JComponent {

    /** The object, that is edited. */
    private Object object;
    /** whether the edit process has been confirmed (user pressed OK). */
    private boolean confirmed;

    /**
     * Creates a new editor.
     */
    public DetailEditor() {
        // nothing required
    }

    /**
     * Updates the object.
     */
    public void update() {
        if (this.object == null) {
            throw new IllegalStateException();
        }
        else {
            updateObject(this.object);
        }
        setConfirmed(false);
    }

    /**
     * Returns the object.
     * 
     * @return The object.
     */
    public Object getObject() {
        return this.object;
    }

    /**
     * Sets the object to be edited.
     * 
     * @param object  the object.
     */
    public void setObject(final Object object) {
        if (object == null) {
            throw new NullPointerException();
        }
        this.object = object;
        setConfirmed(false);
        fillObject();
    }

    /**
     * Parses an integer.
     * 
     * @param text  the text.
     * @param def  the default value.
     * 
     * @return The parsed integer, or the default value if the string didn't contain a
     *         value.
     */
    protected static int parseInt(final String text, final int def) {
        try {
            return Integer.parseInt(text);
        }
        catch (NumberFormatException fe) {
            return def;
        }
    }

    /**
     * Clears the editor.
     */
    public abstract void clear();

    /**
     * Edits the object. The object itself should not be modified, until
     * update or create was called.
     */
    protected abstract void fillObject();

    /**
     * Updates the object.
     * 
     * @param object  the object.
     */
    protected abstract void updateObject(Object object);

    /**
     * Returns the confirmed flag.
     * 
     * @return The confirmed flag.
     */
    public boolean isConfirmed() {
        return this.confirmed;
    }

    /**
     * Sets the confirmed flag.
     * 
     * @param confirmed  the confirmed flag.
     */
    protected void setConfirmed(final boolean confirmed) {
        final boolean oldConfirmed = this.confirmed;
        this.confirmed = confirmed;
        firePropertyChange("confirmed", oldConfirmed, confirmed);
    }

    
}