/*
 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
 * 
 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
 * Virtual Machine, which is developed at Christian Doppler Laboratory on
 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
 * contact us at <http://mevss.jku.at/> if you need additional information
 * or have any questions.
 *
 * 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.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 */ 
package sun.evtracing.parser.metadata;

public class MetadataRef<T> {

	private final long identifier;
	private T metadata;

	public MetadataRef(long identifier) {
		this(identifier, null);
	}

	public MetadataRef(long identifier, T metadata) {
		this.identifier = identifier;
		this.metadata = metadata;
	}

	public long identifier() {
		return identifier;
	}

	public T metadata() {
		return metadata;
	}

	public void setMetadata(T metadata) {
		assert (this.metadata == null) : "set only allowed once";
		this.metadata = metadata;
	}

}