/*
 * Copyright (c) 2011, 2021, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package org.graalvm.visualvm.lib.profiler.api;

import org.openide.util.Lookup;
import org.openide.util.lookup.Lookups;
import org.openide.util.lookup.ProxyLookup;

/**
 * IDE agnostic project definition wrapper.<br>
 * Basically, a simple {@linkplain Lookup.Provider} which contains, as a part 
 * of its lookup, the real project implementation.
 *
 * @author Jaroslav Bachorik
 */
abstract public class ProfilerProject implements Lookup.Provider {
    final private Object lkpLock = new Object();
    // @GuardedBy lkpLock
    private Lookup lkp;
    private Lookup.Provider provider;

    protected ProfilerProject(Lookup.Provider project) {
        this.provider = project;
    }

    @Override
    public Lookup getLookup() {
        synchronized(lkpLock) {
            if (lkp == null) {
                lkp = new ProxyLookup(provider.getLookup(), Lookups.fixed(provider, this), additionalLookup());
            }
            return lkp;
        }
    }

    abstract protected Lookup additionalLookup();
}
