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   1 /*******************************************************************************
   2  * Copyright (c) 2015 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
  10 package org.eclipse.tracecompasss.statesystem.core.tests.stubs.backend;
  11
  12 import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull;
  13
  14 import java.io.IOException;
  15 import java.util.List;
  16
  17 import org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HTConfig;
  18 import org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HTNode;
  19 import org.eclipse.tracecompass.internal.statesystem.core.backend.historytree.HistoryTree;
  20
  21 import com.google.common.collect.Iterables;
  22
  23 /**
  24  * Stub class to unit test the history tree. You can set the size of the
  25  * interval section before using the tree, in order to fine-tune the test.
  26  *
  27  * Note to developers: This tree is not meant to be used with a backend. It just
  28  * exposes some info from the history tree.
  29  *
  30  * @author Geneviève Bastien
  31  */
  32 public class HistoryTreeStub extends HistoryTree {
  33
  34     /**
  35      * Constructor for this history tree stub
  36      *
  37      * @param conf
  38      *            The config to use for this History Tree.
  39      * @throws IOException
  40      *             If an error happens trying to open/write to the file
  41      *             specified in the config
  42      */
  43     public HistoryTreeStub(HTConfig conf) throws IOException {
  44         super(conf);
  45     }
  46
  47     /**
  48      * Get the latest leaf of the tree
  49      *
  50      * @return The current leaf node of the tree
  51      */
  52     public HTNode getLatestLeaf() {
  53         List<HTNode> latest = getLatestBranch();
  54         return checkNotNull(Iterables.getLast(latest));
  55     }
  56
  57     /**
  58      * Get the node from the latest branch at a given position, 0 being the root
  59      * and <size of latest branch - 1> being a leaf node.
  60      *
  61      * @param pos
  62      *            The position at which to return the node
  63      * @return The node at position pos
  64      */
  65     public HTNode getNodeAt(int pos) {
  66         List<HTNode> latest = getLatestBranch();
  67         return checkNotNull(latest.get(pos));
  68     }
  69
  70 }