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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * 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.
 *
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/*
 * @test
 * @bug 7025809 8028543 6415644
 * @summary Test latest, latestSupported, underscore as keyword, etc.
 * @author  Joseph D. Darcy
 * @modules java.compiler
 *          jdk.compiler
 */

import javax.lang.model.SourceVersion;
import static javax.lang.model.SourceVersion.*;

/**
 * Verify latest[Supported] behavior.
 */
public class TestSourceVersion {
    public static void main(String... args) {
        testLatestSupported();
        testUnderscore();
    }

    private static void testLatestSupported() {
        if (SourceVersion.latest() != RELEASE_9 ||
            SourceVersion.latestSupported() != RELEASE_9)
            throw new RuntimeException("Unexpected release value(s) found:\n" +
                                       "latest:\t" + SourceVersion.latest() + "\n" +
                                       "latestSupported:\t" + SourceVersion.latestSupported());
    }

    private static void testUnderscore() {
        String underscore  = "_";
        
        check(true, isKeyword(underscore), "keyword", latest());
        check(false, isName(underscore),  "name", latest());

        for(SourceVersion version : SourceVersion.values()) {
            boolean underscoreIsKeyword = version.compareTo(RELEASE_9 ) >= 0;

            check(underscoreIsKeyword, isKeyword(underscore, version), 
                  "keyword", version);
            check(!underscoreIsKeyword, isName(underscore, version), 
                  "name", version);
        }
    }

    private static void check(boolean result, boolean expected,
                              String message, SourceVersion version) {
        if (result != expected) {
            throw new RuntimeException("Unexpected " + message +  "-ness of _ on " + version);
        }
    }
}