JRuby12Runtime.java

/*
 * Copyright © 2011, 2012 On-Site.com.
 * Copyright © 2015 Chris Jester-Young.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library. Thus, the terms and
 * conditions of the GNU General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent modules,
 * and to copy and distribute the resulting executable under terms of your
 * choice, provided that you also meet, for each linked independent module,
 * the terms and conditions of the license of that module. An independent
 * module is a module which is not derived from or based on this library.
 * If you modify this library, you may extend this exception to your
 * version of the library, but you are not obligated to do so. If you do
 * not wish to do so, delete this exception statement from your version.
 */

package com.sun.tools.hat.internal.lang.jruby12;

import com.sun.tools.hat.internal.lang.LanguageRuntime;
import com.sun.tools.hat.internal.lang.ModelFactory;
import com.sun.tools.hat.internal.lang.Models;
import com.sun.tools.hat.internal.model.JavaClass;
import com.sun.tools.hat.internal.model.Snapshot;

/**
 * Language runtime for JRuby 1.2.
 *
 * @author Chris Jester-Young
 */
public enum JRuby12Runtime implements LanguageRuntime {
    INSTANCE;

    @Override
    public boolean isSupported(Snapshot snapshot) {
        /*
         * BTW, feel free to relax this to enable other versions of
         * JRuby to work, if you are sure the models here work for
         * them too.
         */
        JavaClass constants = snapshot.findClass("org.jruby.runtime.Constants");
        return Models.checkStaticString(constants, "VERSION", "1.2.");
    }

    @Override
    public ModelFactory getFactory(Snapshot snapshot) {
        return isSupported(snapshot) ? new JRuby12(snapshot) : null;
    }
}