SourceAccessor.java

/*
 * Copyright (c) 2013, 2016, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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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package com.oracle.truffle.api.source.impl;

import java.util.Collection;
import java.util.Iterator;
import java.util.ServiceLoader;

public abstract class SourceAccessor {
    private static final SourceAccessor ACCESSOR;
    static {
        final Iterator<SourceAccessor> it = ServiceLoader.load(SourceAccessor.class).iterator();
        ACCESSOR = it.hasNext() ? it.next() : null;
    }

    protected SourceAccessor() {
        if (!"com.oracle.truffle.api.impl.SourceAccessorImpl".equals(getClass().getName())) {
            throw new IllegalStateException();
        }
    }

    public static Collection<ClassLoader> allLoaders() {
        return ACCESSOR.loaders();
    }

    public static boolean isAOT() {
        return ACCESSOR.checkAOT();
    }

    public static void neverPartOfCompilation(String msg) {
        ACCESSOR.assertNeverPartOfCompilation(msg);
    }

    protected abstract Collection<ClassLoader> loaders();

    protected abstract boolean checkAOT();

    protected abstract void assertNeverPartOfCompilation(String msg);

}