/*
 *   
 *
 * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program 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.
 * 
 * This program 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 at /legal/license.txt).
 * 
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 */

package javax.microedition.lcdui;

/**
 * This is a abstract factory for creating Displayable
 * and Item's look & feel peer.
 */
abstract class LFFactory {

    /** singleton concrete factory object */
    private static LFFactory factory;

    /**
     * Returns a concrete factory object.
     */
    static LFFactory getFactory() {
	if (factory == null) {
	    factory = new LFFactoryImpl();
	}

	return factory;
    }

    /**
     * Returns an <code>Alert</code> look & feel implementation.
     *
     * @param a The <code>Alert</code> associated with this look&feel
     *
     * @return an <code>Alert</code> look & feel implementation
     */
    abstract AlertLF getAlertLF(Alert a);

    /**
     * Returns a <code>Canvas</code> look & feel implementation.
     *
     * @param c The <code>Canvas</code> associated with this look&feel
     *
     * @return a <code>Canvas</code> look & feel implementation
     */
    abstract CanvasLF getCanvasLF(Canvas c);

    /**
     * Returns a <code>Form</code> look & feel implementation.
     *
     * @param f The <code>Form</code> associated with this look&feel
     *
     * @return a <code>Form</code> look & feel implementation
     */
    abstract FormLF getFormLF(Form f);
    
    /**
     * Returns a <code>List</code> look & feel implementation.
     *
     * @param list The <code>List</code> associated with this look&feel
     *
     * @return a <code>List</code> look & feel implementation
     */
    abstract FormLF getListLF(List list);
    
    /**
     * Returns a <code>TextBox</code> look & feel implementation.
     *
     * @param tb The <code>TextBox</code> associated with this look&feel
     *
     * @return a <code>TextBox</code> look & feel implementation
     */
    abstract FormLF getTextBoxFormLF(TextBox tb);
    
    /**
     * Returns a <code>ChoiceGroup</code> look & feel implementation.
     *
     * @param cg The <code>ChoiceGroup</code> associated with this 
     *           look&feel
     *
     * @return a <code>ChoiceGroup</code> look & feel implementation
     */
    abstract ChoiceGroupLF getChoiceGroupLF(ChoiceGroup cg);
    
    /**
     * Returns a <code>CustomItem</code> look & feel implementation.
     *
     * @param ci The <code>CustomItem</code> associated with this 
     *             look&feel
     *
     * @return a <code>CustomItem</code> look & feel implementation
     */
    abstract CustomItemLF getCustomItemLF(CustomItem ci);
    
    /**
     * Returns a <code>DateField</code> look & feel implementation.
     *
     * @param df The <code>DateField</code> associated with this look&feel
     *
     * @return a <code>DateField</code> look & feel implementation
     */  
    abstract DateFieldLF getDateFieldLF(DateField df);
    
    /**
     * Returns a <code>Gauge</code> look & feel implementation.
     *
     * @param g The <code>Gauge</code> associated with this look&feel
     *
     * @return a <code>Gauge</code> look & feel implementation
     */
    abstract GaugeLF getGaugeLF(Gauge g);
    
    /**
     * Returns an <code>ImageItem</code> look & feel implementation.
     *
     * @param imgItem The <code>Alert</code> associated with this look&feel
     *
     * @return an <code>ImageItem</code> look & feel implementation
     */
    abstract ImageItemLF getImageItemLF(ImageItem imgItem);
    
    /**
     * Returns a <code>StringItem</code> look & feel implementation.
     *
     * @param strItem The <code>StringItem</code> associated with this 
     *                look&feel
     *
     * @return a <code>StringItem</code> look & feel implementation
     */
    abstract StringItemLF getStringItemLF(StringItem strItem);
    
    /**
     * Returns a <code>Spacer</code> look & feel implementation.
     *
     * @param spacer The <code>Spacer</code> associated with this look&feel
     *
     * @return a <code>Spacer</code> look & feel implementation
     */
    abstract SpacerLF getSpacerLF(Spacer spacer);
    
    /**
     * Returns a <code>TextField</code> look & feel implementation.
     *
     * @param tf The <code>TextField</code> associated with this look&feel
     *
     * @return a <code>TextField</code> look & feel implementation
     */
    abstract TextFieldLF getTextFieldLF(TextField tf);
    
    /**
     * Returns a TextField look & feel implementation 
     * for use in a TextBox screen.
     *
     * @param tf - <placeholder>
     * @return a TextField look & feel implementation
     */
    abstract TextFieldLF getTextBoxLF(TextField tf);
    
    /**
     * Returns a <code>Ticker</code> look & feel implementation.
     *
     * @param ticker The <code>Ticker</code> associated with this look&feel
     *
     * @return a <code>Ticker</code> look & feel implementation.
     */
    abstract TickerLF getTickerLF(Ticker ticker);
}