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| 1 | +//****************************************************************************************************** | |
| 2 | +// TimeExtensions.java - Gbtc | |
| 3 | +// | |
| 4 | +// Copyright � 2010, Grid Protection Alliance. All Rights Reserved. | |
| 5 | +// | |
| 6 | +// Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See | |
| 7 | +// the NOTICE file distributed with this work for additional information regarding copyright ownership. | |
| 8 | +// The GPA licenses this file to you under the Eclipse Public License -v 1.0 (the "License"); you may | |
| 9 | +// not use this file except in compliance with the License. You may obtain a copy of the License at: | |
| 10 | +// | |
| 11 | +// http://www.opensource.org/licenses/eclipse-1.0.php | |
| 12 | +// | |
| 13 | +// Unless agreed to in writing, the subject software distributed under the License is distributed on an | |
| 14 | +// "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the | |
| 15 | +// License for the specific language governing permissions and limitations. | |
| 16 | +// | |
| 17 | +// Code Modification History: | |
| 18 | +// ---------------------------------------------------------------------------------------------------- | |
| 19 | +// 04/23/2012 - Stephen C. Wills | |
| 20 | +// Generated original version of source code. | |
| 21 | +// | |
| 22 | +//****************************************************************************************************** | |
| 23 | + | |
| 24 | +package org.gpa.tsf.util; | |
| 25 | + | |
| 26 | +import java.util.Calendar; | |
| 27 | + | |
| 28 | +/** | |
| 29 | + * Utility class which provides additional | |
| 30 | + * functionality for time representations. | |
| 31 | + */ | |
| 32 | +public class TimeExtensions | |
| 33 | +{ | |
| 34 | + /** | |
| 35 | + * Converts a value in ticks (100-nanosecond intervals since midnight, | |
| 36 | + * January 1, 0001) into a {@link Calendar} instance. Some loss of | |
| 37 | + * precision is incurred as {@code Calendar}s store up to millisecond | |
| 38 | + * precision. | |
| 39 | + * | |
| 40 | + * @param ticks the value in ticks to be converted | |
| 41 | + * @return the equivalent {@code Calendar} instance | |
| 42 | + * @see #toTicks(Calendar) | |
| 43 | + */ | |
| 44 | + public static Calendar fromTicks(long ticks) | |
| 45 | + { | |
| 46 | + Calendar calendar = Calendar.getInstance(); | |
| 47 | + calendar.setTimeInMillis((ticks - TicksAtEpoch) / TicksPerMillisecond); | |
| 48 | + return calendar; | |
| 49 | + } | |
| 50 | + | |
| 51 | + /** | |
| 52 | + * Converts a {@link Calendar} instance into a value in ticks. | |
| 53 | + * | |
| 54 | + * @param calendar the {@code Calendar} instance to be converted | |
| 55 | + * @return the equivalent value in ticks | |
| 56 | + * @see #fromTicks(long) | |
| 57 | + */ | |
| 58 | + public static long toTicks(Calendar calendar) | |
| 59 | + { | |
| 60 | + return (calendar.getTimeInMillis() * TicksPerMillisecond) + TicksAtEpoch; | |
| 61 | + } | |
| 62 | + | |
| 63 | + private static final long TicksAtEpoch = 621355968000000000L; | |
| 64 | + private static final long TicksPerMillisecond = 10000L; | |
| 65 | +} | |