org.eclipse.linuxtools.lttng.ui/src/org/eclipse/linuxtools/lttng/ui/views/common/AbsTRangeUpdate.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are made
   5  * available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors: Alvaro Sanchez-Leon - Initial implementation
  10  *******************************************************************************/
  11 package org.eclipse.linuxtools.lttng.ui.views.common;
  12
  13 import org.eclipse.linuxtools.lttng.state.evProcessor.ILttngEventProcessor;
  14 import org.eclipse.linuxtools.lttng.state.evProcessor.state.AbsStateProcessing;
  15 import org.eclipse.linuxtools.lttng.state.model.LttngTraceState;
  16 import org.eclipse.linuxtools.tmf.event.TmfTimeRange;
  17
  18 public abstract class AbsTRangeUpdate extends AbsStateProcessing implements
  19                 ILttngEventProcessor {
  20
  21     private static final long MINORBITS = 20;
  22
  23         // ========================================================================
  24         // General methods
  25         // =======================================================================
  26
  27     /**
  28      * Get the mkdev node id<br>
  29      * <br>
  30      * This is an implementation of a KERNEL macro used in Lttv
  31      *
  32      */
  33     public long getMkdevId(long major, long minor) {
  34         return (((major) << MINORBITS) | (minor));
  35     }
  36
  37         /**
  38          * Get the pixels per Nano second, either from active widgets or initialise
  39          * with the experiment time range values
  40          *
  41          * @param traceSt
  42          * @param params
  43          *
  44          * @return double
  45          */
  46     protected double getPixelsPerNs(LttngTraceState traceSt, ParamsUpdater params) {
  47         double pixPerNs = params.getPixelsPerNs();
  48         if (pixPerNs == 0) {
  49             TmfTimeRange tsetRange = traceSt.getContext().getExperimentTimeWindow();
  50
  51             long startTime = tsetRange.getStartTime().getValue();
  52             long endTime = tsetRange.getEndTime().getValue();
  53             long delta = endTime - startTime;
  54
  55             if (delta > 0) {
  56                 pixPerNs = (double) params.getWidth() / (double) delta;
  57                 params.setPixelsPerNs(pixPerNs);
  58             }
  59         }
  60         return pixPerNs;
  61         }
  62
  63 }