/** * @(#)Source.java	1.2 03/01/23 * * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved. * * This software is the proprietary information of Sun Microsystems, Inc. * Use is subject to license terms. * */package com.sun.tools.javac.v8.code;import com.sun.tools.javac.v8.util.*;/** * The source language version accepted. */public class Source {    private static final Context.Key sourceKey = new Context.Key();    public static Source instance(Context context) {        Source instance = (Source) context.get(sourceKey);        if (instance == null) {            Options options = Options.instance(context);            String sourceString = (String) options.get("-source");            if (sourceString != null)                instance = lookup(sourceString);            if (instance == null)                instance = DEFAULT;            context.put(sourceKey, instance);        }        return instance;    }    private static int nextOrdinal = 0;    private static final Hashtable tab = new Hashtable();    public final int ordinal = nextOrdinal++;    public final String name;    private Source(String name) {        super();        this.name = name;        tab.put(name, this);    }    /**      * 1.2 introduced strictfp.      */    public static final Source JDK1_2 = new Source("1.2");    /**     * 1.3 is the same language as 1.2.     */    public static final Source JDK1_3 = new Source("1.3");    /**     * 1.4 introduced assert.     */    public static final Source JDK1_4 = new Source("1.4");    public static final Source DEFAULT = JDK1_3;    public static Source lookup(String name) {        return (Source) tab.get(name);    }}