1. /*
  2. * $Header: /home/cvs/jakarta-commons/primitives/src/java/org/apache/commons/collections/primitives/adapters/ListIteratorDoubleListIterator.java,v 1.3 2003/10/16 20:49:38 scolebourne Exp $
  3. * ====================================================================
  4. * The Apache Software License, Version 1.1
  5. *
  6. * Copyright (c) 2003 The Apache Software Foundation. All rights
  7. * reserved.
  8. *
  9. * Redistribution and use in source and binary forms, with or without
  10. * modification, are permitted provided that the following conditions
  11. * are met:
  12. *
  13. * 1. Redistributions of source code must retain the above copyright
  14. * notice, this list of conditions and the following disclaimer.
  15. *
  16. * 2. Redistributions in binary form must reproduce the above copyright
  17. * notice, this list of conditions and the following disclaimer in
  18. * the documentation and/or other materials provided with the
  19. * distribution.
  20. *
  21. * 3. The end-user documentation included with the redistribution, if
  22. * any, must include the following acknowledgement:
  23. * "This product includes software developed by the
  24. * Apache Software Foundation (http://www.apache.org/)."
  25. * Alternately, this acknowledgement may appear in the software itself,
  26. * if and wherever such third-party acknowledgements normally appear.
  27. *
  28. * 4. The names "The Jakarta Project", "Commons", and "Apache Software
  29. * Foundation" must not be used to endorse or promote products derived
  30. * from this software without prior written permission. For written
  31. * permission, please contact apache@apache.org.
  32. *
  33. * 5. Products derived from this software may not be called "Apache"
  34. * nor may "Apache" appear in their names without prior written
  35. * permission of the Apache Software Foundation.
  36. *
  37. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  38. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  39. * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  40. * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  41. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  42. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  43. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  44. * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  45. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  46. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  47. * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48. * SUCH DAMAGE.
  49. * ====================================================================
  50. *
  51. * This software consists of voluntary contributions made by many
  52. * individuals on behalf of the Apache Software Foundation. For more
  53. * information on the Apache Software Foundation, please see
  54. * <http://www.apache.org/>.
  55. *
  56. */
  57. package org.apache.commons.collections.primitives.adapters;
  58. import java.util.ListIterator;
  59. import org.apache.commons.collections.primitives.DoubleListIterator;
  60. /**
  61. * Adapts a {@link Number}-valued {@link ListIterator ListIterator}
  62. * to the {@link DoubleListIterator DoubleListIterator} interface.
  63. * <p />
  64. * This implementation delegates most methods
  65. * to the provided {@link DoubleListIterator DoubleListIterator}
  66. * implementation in the "obvious" way.
  67. *
  68. * @since Commons Primitives 1.0
  69. * @version $Revision: 1.3 $ $Date: 2003/10/16 20:49:38 $
  70. * @author Rodney Waldhoff
  71. */
  72. public class ListIteratorDoubleListIterator implements DoubleListIterator {
  73. /**
  74. * Create an {@link DoubleListIterator DoubleListIterator} wrapping
  75. * the specified {@link ListIterator ListIterator}. When
  76. * the given <i>iterator</i> is <code>null</code>,
  77. * returns <code>null</code>.
  78. *
  79. * @param iterator the (possibly <code>null</code>)
  80. * {@link ListIterator ListIterator} to wrap
  81. * @return an {@link DoubleListIterator DoubleListIterator} wrapping the given
  82. * <i>iterator</i>, or <code>null</code> when <i>iterator</i> is
  83. * <code>null</code>.
  84. */
  85. public static DoubleListIterator wrap(ListIterator iterator) {
  86. return null == iterator ? null : new ListIteratorDoubleListIterator(iterator);
  87. }
  88. /**
  89. * Creates an {@link DoubleListIterator DoubleListIterator} wrapping
  90. * the specified {@link ListIterator ListIterator}.
  91. * @see #wrap
  92. */
  93. public ListIteratorDoubleListIterator(ListIterator iterator) {
  94. _iterator = iterator;
  95. }
  96. public int nextIndex() {
  97. return _iterator.nextIndex();
  98. }
  99. public int previousIndex() {
  100. return _iterator.previousIndex();
  101. }
  102. public boolean hasNext() {
  103. return _iterator.hasNext();
  104. }
  105. public boolean hasPrevious() {
  106. return _iterator.hasPrevious();
  107. }
  108. public double next() {
  109. return ((Number)_iterator.next()).doubleValue();
  110. }
  111. public double previous() {
  112. return ((Number)_iterator.previous()).doubleValue();
  113. }
  114. public void add(double element) {
  115. _iterator.add(new Double(element));
  116. }
  117. public void set(double element) {
  118. _iterator.set(new Double(element));
  119. }
  120. public void remove() {
  121. _iterator.remove();
  122. }
  123. private ListIterator _iterator = null;
  124. }