org.eclipse.linuxtools.lttng.ui/stubs/org/eclipse/linuxtools/lttng/stubs/LTTngTraceStub.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made 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:
  10  *   Francois Chouinard (fchouinard@gmail.com) - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.lttng.stubs;
  14
  15 import java.io.FileNotFoundException;
  16 import java.io.IOException;
  17 import java.io.RandomAccessFile;
  18
  19 import org.eclipse.linuxtools.tmf.event.TmfEvent;
  20 import org.eclipse.linuxtools.tmf.trace.ITmfEventParser;
  21 import org.eclipse.linuxtools.tmf.trace.TmfTrace;
  22 import org.eclipse.linuxtools.tmf.trace.TmfTraceContext;
  23
  24 /**
  25  * <b><u>LTTngTraceStub</u></b>
  26  * <p>
  27  * Dummy test trace. Use in conjunction with LTTngEventParserStub.
  28  */
  29 public class LTTngTraceStub extends TmfTrace {
  30
  31     // ========================================================================
  32     // Attributes
  33     // ========================================================================
  34
  35     // The actual stream
  36     private final RandomAccessFile fTrace;
  37
  38     // The associated event parser
  39     private final ITmfEventParser fParser;
  40
  41     // ========================================================================
  42     // Constructors
  43     // ========================================================================
  44
  45     /**
  46      * @param filename
  47      * @param parser
  48      * @throws FileNotFoundException
  49      */
  50     public LTTngTraceStub(String filename) throws FileNotFoundException {
  51         this(filename, DEFAULT_CACHE_SIZE);
  52     }
  53
  54     /**
  55      * @param filename
  56      * @param parser
  57      * @param cacheSize
  58      * @throws FileNotFoundException
  59      */
  60     public LTTngTraceStub(String filename, int cacheSize) throws FileNotFoundException {
  61         super(filename, cacheSize, false);
  62         fTrace = new RandomAccessFile(filename, "r");
  63         fParser = new LTTngEventParserStub();
  64         indexStream();
  65     }
  66
  67     // ========================================================================
  68     // Accessors
  69     // ========================================================================
  70
  71     public RandomAccessFile getStream() {
  72         return fTrace;
  73     }
  74
  75     // ========================================================================
  76     // Operators
  77     // ========================================================================
  78
  79     /* (non-Javadoc)
  80      * @see org.eclipse.linuxtools.tmf.eventlog.ITmfStreamLocator#seekLocation(java.lang.Object)
  81      */
  82         public TmfTraceContext seekLocation(Object location) {
  83         TmfTraceContext context = null;
  84         try {
  85                 synchronized(fTrace) {
  86                         fTrace.seek((location != null) ? (Long) location : 0);
  87                         context = new TmfTraceContext(getCurrentLocation(), null, 0);
  88                 }
  89         } catch (IOException e) {
  90                 // TODO Auto-generated catch block
  91                 e.printStackTrace();
  92         }
  93         return context;
  94     }
  95
  96     /* (non-Javadoc)
  97      * @see org.eclipse.linuxtools.tmf.eventlog.ITmfStreamLocator#getCurrentLocation()
  98      */
  99     @Override
 100         public Object getCurrentLocation() {
 101         try {
 102                 return new Long(fTrace.getFilePointer());
 103         } catch (IOException e) {
 104                 // TODO Auto-generated catch block
 105                 e.printStackTrace();
 106         }
 107         return null;
 108     }
 109
 110         /* (non-Javadoc)
 111          * @see org.eclipse.linuxtools.tmf.trace.ITmfTrace#parseEvent()
 112          */
 113         @Override
 114         public TmfEvent parseEvent(TmfTraceContext context) {
 115         try {
 116                         // paserNextEvent updates the context
 117                         TmfEvent event = fParser.parseNextEvent(this, context);
 118                         if (event != null) {
 119                                 context.setTimestamp(event.getTimestamp());
 120                         }
 121                 return event;
 122         }
 123         catch (IOException e) {
 124                 e.printStackTrace();
 125         }
 126         return null;
 127         }
 128
 129         /* (non-Javadoc)
 130          * @see java.lang.Object#toString()
 131          */
 132         @Override
 133         public String toString() {
 134                 return "[LTTngTraceStub]";
 135         }
 136
 137 //    // ========================================================================
 138 //    // Helper functions
 139 //    // ========================================================================
 140 //
 141 //    /* (non-Javadoc)
 142 //     * @see org.eclipse.linuxtools.tmf.eventlog.ITmfEventStream#getAttributes()
 143 //     */
 144 //    public Map<String, Object> getAttributes() {
 145 //        // TODO Auto-generated method stub
 146 //        return null;
 147 //    }
 148
 149 }