org.eclipse.linuxtools.tmf.ui/src/org/eclipse/linuxtools/tmf/ui/widgets/timegraph/widgets/TimeGraphSelection.java

   1 /*****************************************************************************
   2  * Copyright (c) 2007, 2013 Intel Corporation, Ericsson
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *   Intel Corporation - Initial API and implementation
  10  *   Ruslan A. Scherbakov, Intel - Initial API and implementation
  11  *   Alvaro Sanchez-Leon - Updated for TMF
  12  *   Patrick Tasse - Refactoring
  13  *****************************************************************************/
  14
  15 package org.eclipse.linuxtools.tmf.ui.widgets.timegraph.widgets;
  16
  17 import java.util.ArrayList;
  18 import java.util.Iterator;
  19 import java.util.List;
  20
  21 import org.eclipse.jface.viewers.IStructuredSelection;
  22
  23 /**
  24  * Selection object for the time graph scale
  25  *
  26  * @version 1.0
  27  * @author Alvaro Sanchez-Leon
  28  * @author Patrick Tasse
  29  */
  30 public class TimeGraphSelection implements IStructuredSelection {
  31
  32     private List<Object> list = new ArrayList<>();
  33
  34     /**
  35      * Default constructor
  36      */
  37     public TimeGraphSelection() {
  38     }
  39
  40     /**
  41      * "Wrapper" constructor. Instantiate a new selection object with only one
  42      * existing selection.
  43      *
  44      * @param sel
  45      *            The initial selection to add to this one
  46      */
  47     public TimeGraphSelection(Object sel) {
  48         if (sel != null) {
  49             list.add(sel);
  50         }
  51     }
  52
  53     /**
  54      * Add a selection to this one.
  55      *
  56      * @param sel
  57      *            The selection to add
  58      */
  59     public void add(Object sel) {
  60         if (null != sel && !list.contains(sel)) {
  61             list.add(sel);
  62         }
  63     }
  64
  65     @Override
  66     public Object getFirstElement() {
  67         if (!list.isEmpty()) {
  68             return list.get(0);
  69         }
  70         return null;
  71     }
  72
  73     @Override
  74     public Iterator<Object> iterator() {
  75         return list.iterator();
  76     }
  77
  78     @Override
  79     public int size() {
  80         return list.size();
  81     }
  82
  83     @Override
  84     public Object[] toArray() {
  85         return list.toArray();
  86     }
  87
  88     @Override
  89     public List<Object> toList() {
  90         return list;
  91     }
  92
  93     @Override
  94     public boolean isEmpty() {
  95         return list.isEmpty();
  96     }
  97 }