1 /*
   2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.consumer;
  27 
  28 import java.time.DateTimeException;
  29 import java.time.ZoneOffset;
  30 
  31 import jdk.jfr.internal.LogLevel;
  32 import jdk.jfr.internal.LogTag;
  33 import jdk.jfr.internal.Logger;
  34 import jdk.jfr.internal.consumer.ChunkHeader;
  35 
  36 /**
  37  * Converts ticks to nanoseconds
  38  */
  39 final class TimeConverter {
  40     private final long startTicks;
  41     private final long startNanos;
  42     private final double divisor;
  43     private final ZoneOffset zoneOffet;
  44 
  45     TimeConverter(ChunkHeader chunkHeader, int rawOffset) {
  46         this.startTicks = chunkHeader.getStartTicks();
  47         this.startNanos = chunkHeader.getStartNanos();
  48         this.divisor = chunkHeader.getTicksPerSecond() / 1000_000_000L;
  49         this.zoneOffet = zoneOfSet(rawOffset);
  50     }
  51 
  52     private ZoneOffset zoneOfSet(int rawOffset) {
  53         try {
  54             return ZoneOffset.ofTotalSeconds(rawOffset / 1000);
  55         } catch (DateTimeException dte) {
  56             Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Could not create ZoneOffset from raw offset " + rawOffset);
  57         }
  58         return ZoneOffset.UTC;
  59     }
  60 
  61     public long convertTimestamp(long ticks) {
  62         return startNanos + (long) ((ticks - startTicks) / divisor);
  63     }
  64 
  65     public long convertTimespan(long ticks) {
  66         return (long) (ticks / divisor);
  67     }
  68 
  69     public ZoneOffset getZoneOffset() {
  70         return zoneOffet;
  71     }
  72 }