/*
 * Copyright (c) 2019, 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 org.graalvm.visualvm.jfr;

import org.graalvm.visualvm.core.datasource.DataSource;
import org.graalvm.visualvm.core.datasource.descriptor.DataSourceDescriptor;
import org.graalvm.visualvm.core.datasource.descriptor.DataSourceDescriptorFactory;
import org.graalvm.visualvm.core.model.AbstractModelProvider;

/**
 * Toplevel node JFR Snapshots in Applications window.
 *
 * @author Jiri Sedlacek
 */
public final class JFRSnapshotsContainer extends DataSource {
    
    private static JFRSnapshotsContainer sharedInstance;
    
    
    /**
     * Returns singleton instance of JFRSnapshotsContainer.
     * 
     * @return singleton instance of JFRSnapshotsContainer.
     */
    public static synchronized JFRSnapshotsContainer sharedInstance() {
        if (sharedInstance == null) sharedInstance = new JFRSnapshotsContainer();
        return sharedInstance;
    }


    private JFRSnapshotsContainer() {
        DataSourceDescriptorFactory.getDefault().registerProvider(new AbstractModelProvider<DataSourceDescriptor,DataSource>() {
                public DataSourceDescriptor createModelFor(DataSource ds) {
                    if (JFRSnapshotsContainer.sharedInstance().equals(ds))
                        return new JFRSnapshotsContainerDescriptor();
                    else return null;
                }
            }
        );
        DataSource.ROOT.getRepository().addDataSource(this);
    }

}
