Exceptions.java

/*
 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code 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 code 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 in the LICENSE file that
 * accompanied this code).
 *
 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

public class Exceptions {
    private static Map<String, Class> exceptions = new HashMap<String, Class>();

    static {
        put("nullpointerexception", NullPointerException.class);
        put("illegalargumentexception", IllegalArgumentException.class);
    }

    private static void put(String key, Class clazz) {
        Class c = exceptions.put(key, clazz);
        if (c != null) {
            throw new RuntimeException(key + " already exisits");
        }
    }

    public static Class get(String key) {
        return exceptions.get(key.toLowerCase(Locale.ROOT));
    }
}