001/**
002 * Copyright 2014 Tampere University of Technology, Pori Department
003 * 
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * 
008 *   http://www.apache.org/licenses/LICENSE-2.0
009 * 
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package core.tut.pori.datatypes;
017
018import java.util.ArrayList;
019import java.util.Iterator;
020
021/**
022 * class for storing primitive integers
023 *
024 */
025public final class IntPrimitiveList {
026  private static final int ARRAY_SIZE = 50;
027  private ArrayList<int[]> _arrays = null;
028  private int[] _currentArray = null;
029  private int _currentIndex = ARRAY_SIZE; // set to maximum so that new array is created on first call
030  private int _valueCount = 0;
031  
032  /**
033   * 
034   * @param value
035   */
036  public void add(int value){
037    if(_currentIndex >= ARRAY_SIZE){
038      _currentArray = new int[ARRAY_SIZE];
039      _currentIndex = 0;
040      _arrays.add(_currentArray);
041    }
042    _currentArray[_currentIndex++] = value;
043    ++_valueCount;
044  }
045  
046  /**
047   * 
048   */
049  public IntPrimitiveList(){
050    _arrays = new ArrayList<>();
051  }
052  
053  /**
054   * 
055   * @return the list as an array
056   */
057  public int[] toArray(){
058    if(_arrays.isEmpty()){
059      return null;
060    }
061    int[] array = new int[_valueCount];
062    int index = 0;
063    for(Iterator<int[]> iter = _arrays.iterator();iter.hasNext();){
064      int[] temp = iter.next();
065      for(int i=0;i<temp.length && index < _valueCount;++i){
066        array[index++] = temp[i];
067      }
068    }
069    return array;
070  }
071}