org.eclipse.tracecompass.ctf.core/src/org/eclipse/tracecompass/ctf/core/event/scope/RootScope.java

   1 /*******************************************************************************
   2  * Copyright (c) 2014 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:
  10  *      Matthew Khouzam - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.ctf.core.event.scope;
  14
  15 import org.eclipse.jdt.annotation.NonNullByDefault;
  16 import org.eclipse.jdt.annotation.Nullable;
  17
  18 /**
  19  * A lttng specific speedup node a root with accelerated returns for some scopes
  20  * of a lexical scope
  21  *
  22  * @author Matthew Khouzam
  23  */
  24 @NonNullByDefault
  25 public final class RootScope extends LexicalScope {
  26
  27     /**
  28      * The scope constructor
  29      */
  30     public RootScope() {
  31         super();
  32     }
  33
  34     @Override
  35     @Nullable
  36     public ILexicalScope getChild(String name) {
  37         /*
  38          * This happens ~40 % of the time
  39          */
  40         if (name.equals(EVENT_HEADER.getPath())) {
  41             return EVENT_HEADER;
  42         }
  43         /*
  44          * This happens ~30 % of the time
  45          */
  46         if (name.equals(FIELDS.getPath())) {
  47             return FIELDS;
  48         }
  49         /*
  50          * This happens ~30 % of the time
  51          */
  52         if (name.equals(CONTEXT.getPath())) {
  53             return CONTEXT;
  54         }
  55         /*
  56          * This happens ~1 % of the time
  57          */
  58         if (name.equals(PACKET_HEADER.getPath())) {
  59             return PACKET_HEADER;
  60         }
  61         return super.getChild(name);
  62     }
  63
  64 }