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Unit Standard (JSR 363) Reference Implementation.
There is a newer version: 1.0.3
/**
 *  Unit-API - Units of Measurement API for Java
 *  Copyright (c) 2005-2014, Jean-Marie Dautelle, Werner Keil, V2COM.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of JSR-363 nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package tec.units.ri;

import javax.measure.Quantity;

/**
 * 
 * This class represents the immutable result of a measurement stated in a known
 * quantity.
 * 
 * 
 * 
 * All instances of this class shall be immutable.
 * 
 * 
 * @author Werner Keil
 * @version 0.1, $Date: 2014-11-29 $
 */
public abstract class AbstractMeasurement> implements
		Measurement {

	/**
	 * 
	 */
	// private static final long serialVersionUID = 2417644773551236879L;

	private final Quantity quantity;

	private final long timestamp;

	/**
	 * constructor.
	 */
	protected AbstractMeasurement(Quantity q, long t) {
		this.quantity = q;
		this.timestamp = t;
	}

	/**
	 * constructor.
	 */
	protected AbstractMeasurement(Quantity q) {
		this(q, System.currentTimeMillis());
	}

	/**
	 * Returns the measurement quantity.
	 *
	 * @return the quantity.
	 */
	public final Quantity getQuantity() {
		return quantity;
	}

	/**
	 * Returns the measurement timestamp.
	 *
	 * @return the timestamp.
	 */
	public final long getTimestamp() {
		return timestamp;
	}
	
	@SuppressWarnings({ "unchecked" })
	static final > Measurement of(Quantity q) {
		return new Default(q);
	}
	
	@SuppressWarnings({ "unchecked" })
	static final > Measurement of(Quantity q, long t) {
		return new Default(q, t);
	}

	/**
	 * This class represents the default measurement.
	 */
	@SuppressWarnings("rawtypes")
	private static final class Default extends AbstractMeasurement {

		@SuppressWarnings({ "unchecked" })
		protected > Default(Quantity q, long t) {
			super(q, t);
		}

		@SuppressWarnings("unchecked")
		protected > Default(Quantity q) {
			super(q);
		}

		@Override
		public int compareTo(Object o) {
			// TODO Auto-generated method stub
			return 0;
		}
	}
}