parserfactory.java

来自「cqME :java framework for TCK test.」· Java 代码 · 共 70 行

/*
 * $Id$
 *
 * Copyright 1996-2007 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 com.sun.tck.j2me.utils.javasourcemodel;

/**
 * This class represents a Factory for Java source parsers.
 *
 * ParserFactory is used for obtaining Parser instances for desired
 * Java Language versions. For this, static method <code>getParser</code>
 * should be called.
 */
public final class ParserFactory {
    
    /**
     * Gets Parser instance for specified version of the Java Language.
     *
     * @param   lang    version of the Java Language
     *
     * @return  Parser instance which parses specified version of 
     *          the Java Language.
     *
     * @exception   UnsupportedOperationException if specified version of
     *      the Java Language is not supported.
     */ 
    public static Parser getParser(JavaLanguage lang) {
        switch (lang) {
        case SECOND_EDITION:
            try {
                return (Parser) Class.forName(secondEditionParser)
                        .newInstance();
            } catch (Exception e) {
                throw new RuntimeException("Cannot create parser", e);
            } 
        default:
            throw new UnsupportedOperationException(
                    "Unsupported Java Language version: " + lang);
        }
    }

    private ParserFactory() {}
    
    private static final String secondEditionParser 
            = "com.sun.tck.j2me.utils.javasourcemodel.Parser2";
}