backend.java

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

/*
 * @(#)BackEnd.java	1.7 06/10/10
 *
 * Copyright  1990-2008 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 sun.tools.javazic;

/**
 * <code>BackEnd</code> is an abstract base class for a back-end of compiling
 * Olson's zoneinfo database and generating Java zoneinfo database.
 *
 * @since 1.4
 */          
abstract class BackEnd {

    /**
     * Receives each zone's TimeZone information which was created by 
     * {@link Zoneinfo#parse} in class <code>Zoneinfo</code>,
     * and processes it.
     * @param tz Timezone object for each zone
     * @return 0 if no error occurred, otherwise 1.
     */
    abstract int processZoneinfo(Timezone tz);

    /**
     * Receives whole information which is generated by JavaZic's front-end
     * in the form of Mapping object and generates total Java zone information
     * file.
     * @param m Mappings object which is generated by {@link Main#compile Main.compile()}.
     * @return 0 if no error occurred, otherwise 1.
     */
    abstract int generateSrc(Mappings m);

    /**
     * Decides which backend class should be used and returns its instance.
     * @return an instance of backend class
     */
    static BackEnd getBackEnd() {
	if (Zoneinfo.isYearForTimeZoneDataSpecified) {
	    return new Simple();
	} else if (Main.outputSrc) {
	    return new GenSrc();
	} else if (Main.outputDoc) {
	    return new GenDoc();
	} else {
	    return new Gen();
	}
    }
}