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/*
 *      Copyright 2005 stat4j.org
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *      You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */

package net.sourceforge.stat4j;

import java.io.Serializable;

/**
 * Name:                Reading.java
 * Date:                Aug 29, 2004
 * Description:
 * 
 * A reading captured from the log at a point in time.
 * 
 * The reading value is derived from the log message itself
 * using a scrap expression. If no scrap expression is supplied 
 * the value defaults to 1.0.
 * 
 * 
 * @author Lara D'Abreo
 */
public class Reading implements Serializable{

        protected       long    timestamp;
        protected       long    freeMemory;
        protected       double  value;  
        
        
        public Reading() {
                this.timestamp = System.currentTimeMillis();
                this.freeMemory = Runtime.getRuntime().freeMemory();
                this.value = 1.0;
        }
        
        public Reading(double value) {
                this();
                this.value = value;
        }
                
        public double getReading(Unit unit) {
        
                if (unit == Unit.MEMORY) {
                        return freeMemory;      
                }else if (unit == Unit.TIME) {
                        return timestamp;
                }else {
                        return value;
                }
        }
        /**
         * @return
         */
        public long getFreeMemory() {
                return freeMemory;
        }

        /**
         * @return
         */
        public long getTimestamp() {
                return timestamp;
        }

        /**
         * @return
         */
        public double getValue() {
                return value;
        }

}