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   1 /*******************************************************************************
   2  * Copyright (c) 2014 École Polytechnique de Montréal
   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  *   Florian Wininger - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.internal.statesystem.core.backend.historytree;
  14
  15 import java.nio.ByteBuffer;
  16
  17 /**
  18  * A Leaf node is a last-level node of a History Tree.
  19  *
  20  * A leaf node cannot have children, so it extends HTNode without adding
  21  * anything in particular.
  22  *
  23  * @author Florian Wininger
  24  */
  25 public final class LeafNode extends HTNode {
  26
  27     /**
  28      * Initial constructor. Use this to initialize a new EMPTY node.
  29      *
  30      * @param config
  31      *            Configuration of the History Tree
  32      * @param seqNumber
  33      *            The (unique) sequence number assigned to this particular node
  34      * @param parentSeqNumber
  35      *            The sequence number of this node's parent node
  36      * @param start
  37      *            The earliest timestamp stored in this node
  38      */
  39     public LeafNode(HTConfig config, int seqNumber, int parentSeqNumber,
  40             long start) {
  41         super(config, seqNumber, parentSeqNumber, start);
  42     }
  43
  44     @Override
  45     protected void readSpecificHeader(ByteBuffer buffer) {
  46         /* No specific header part */
  47     }
  48
  49     @Override
  50     protected void writeSpecificHeader(ByteBuffer buffer) {
  51         /* No specific header part */
  52     }
  53
  54     @Override
  55     public NodeType getNodeType() {
  56         return NodeType.LEAF;
  57     }
  58
  59     @Override
  60     protected int getSpecificHeaderSize() {
  61         /* Empty */
  62         return 0;
  63     }
  64
  65     @Override
  66     public String toStringSpecific() {
  67         /* Only used for debugging, shouldn't be externalized */
  68         return "Leaf Node, "; //$NON-NLS-1$;
  69     }
  70
  71 }