org.eclipse.linuxtools.tmf.tests/stubs/org/eclipse/linuxtools/tmf/trace/TmfTraceStub.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009, 2010 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 - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.tmf.trace;
  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.parser.ITmfEventParser;
  21
  22 /**
  23  * <b><u>TmfTraceStub</u></b>
  24  * <p>
  25  * Dummy test trace. Use in conjunction with TmfEventParserStub.
  26  */
  27 public class TmfTraceStub extends TmfTrace<TmfEvent> {
  28
  29     // ------------------------------------------------------------------------
  30     // Attributes
  31     // ------------------------------------------------------------------------
  32
  33     // The actual stream
  34     private final RandomAccessFile fTrace;
  35
  36     // The associated event parser
  37     private final ITmfEventParser fParser;
  38
  39     // ------------------------------------------------------------------------
  40     // Constructors
  41     // ------------------------------------------------------------------------
  42
  43     /**
  44      * @param filename
  45      * @throws FileNotFoundException
  46      */
  47     public TmfTraceStub(String filename) throws FileNotFoundException {
  48         this(filename, DEFAULT_CACHE_SIZE, false);
  49     }
  50
  51     /**
  52      * @param filename
  53      * @param cacheSize
  54      * @throws FileNotFoundException
  55      */
  56     public TmfTraceStub(String filename, int cacheSize) throws FileNotFoundException {
  57         this(filename, cacheSize, false);
  58     }
  59
  60     /**
  61      * @param filename
  62      * @throws FileNotFoundException
  63      */
  64     public TmfTraceStub(String filename, boolean waitForCompletion) throws FileNotFoundException {
  65         this(filename, DEFAULT_CACHE_SIZE, waitForCompletion);
  66     }
  67
  68     /**
  69      * @param filename
  70      * @param cacheSize
  71      * @throws FileNotFoundException
  72      */
  73     public TmfTraceStub(String filename, int cacheSize, boolean waitForCompletion) throws FileNotFoundException {
  74         super(TmfEvent.class, filename, cacheSize);
  75         fTrace = new RandomAccessFile(filename, "r");
  76         fParser = new TmfEventParserStub();
  77         indexTrace(waitForCompletion);
  78     }
  79
  80     // ------------------------------------------------------------------------
  81     // Accessors
  82     // ------------------------------------------------------------------------
  83
  84     public RandomAccessFile getStream() {
  85         return fTrace;
  86     }
  87
  88     // ------------------------------------------------------------------------
  89     // Operators
  90     // ------------------------------------------------------------------------
  91
  92         @Override
  93         @SuppressWarnings("unchecked")
  94         public TmfContext seekLocation(ITmfLocation<?> location) {
  95         try {
  96                 synchronized(fTrace) {
  97                         // Position the trace at the requested location and
  98                         // returns the corresponding context
  99                         long loc = (location != null) ? ((TmfLocation<Long>) location).getLocation() : 0;
 100                         if (loc != fTrace.getFilePointer()) {
 101                                 fTrace.seek(loc);
 102                         }
 103                         TmfContext context = new TmfContext(getCurrentLocation(), 0);
 104                         return context;
 105                 }
 106                 } catch (IOException e) {
 107                         e.printStackTrace();
 108                 }
 109                 return null;
 110     }
 111
 112     @Override
 113         public TmfLocation<Long> getCurrentLocation() {
 114         try {
 115             return new TmfLocation<Long>(fTrace.getFilePointer());
 116         } catch (IOException e) {
 117             e.printStackTrace();
 118         }
 119         return null;
 120     }
 121
 122         @Override
 123         public TmfEvent parseEvent(TmfContext context) {
 124         try {
 125                         // paserNextEvent updates the context
 126                         TmfEvent event = fParser.parseNextEvent(this, context);
 127                 return event;
 128         }
 129         catch (IOException e) {
 130                 e.printStackTrace();
 131         }
 132         return null;
 133         }
 134
 135 }