J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.swing; |
| 27 | |
| 28 | import java.util.*; |
| 29 | import java.io.Serializable; |
| 30 | |
| 31 | |
| 32 | /** |
| 33 | * A simple implementation of <code>SpinnerModel</code> whose |
| 34 | * values are defined by an array or a <code>List</code>. |
| 35 | * For example to create a model defined by |
| 36 | * an array of the names of the days of the week: |
| 37 | * <pre> |
| 38 | * String[] days = new DateFormatSymbols().getWeekdays(); |
| 39 | * SpinnerModel model = new SpinnerListModel(Arrays.asList(days).subList(1, 8)); |
| 40 | * </pre> |
| 41 | * This class only stores a reference to the array or <code>List</code> |
| 42 | * so if an element of the underlying sequence changes, it's up |
| 43 | * to the application to notify the <code>ChangeListeners</code> by calling |
| 44 | * <code>fireStateChanged</code>. |
| 45 | * <p> |
| 46 | * This model inherits a <code>ChangeListener</code>. |
| 47 | * The <code>ChangeListener</code>s are notified whenever the |
| 48 | * model's <code>value</code> or <code>list</code> properties changes. |
| 49 | * |
| 50 | * @see JSpinner |
| 51 | * @see SpinnerModel |
| 52 | * @see AbstractSpinnerModel |
| 53 | * @see SpinnerNumberModel |
| 54 | * @see SpinnerDateModel |
| 55 | * |
| 56 | * @author Hans Muller |
| 57 | * @since 1.4 |
| 58 | */ |
| 59 | public class SpinnerListModel extends AbstractSpinnerModel implements Serializable |
| 60 | { |
| 61 | private List list; |
| 62 | private int index; |
| 63 | |
| 64 | |
| 65 | /** |
| 66 | * Constructs a <code>SpinnerModel</code> whose sequence of |
| 67 | * values is defined by the specified <code>List</code>. |
| 68 | * The initial value (<i>current element</i>) |
| 69 | * of the model will be <code>values.get(0)</code>. |
| 70 | * If <code>values</code> is <code>null</code> or has zero |
| 71 | * size, an <code>IllegalArugmentException</code> is thrown. |
| 72 | * |
| 73 | * @param values the sequence this model represents |
| 74 | * @throws IllegalArugmentException if <code>values</code> is |
| 75 | * <code>null</code> or zero size |
| 76 | */ |
| 77 | public SpinnerListModel(List<?> values) { |
| 78 | if (values == null || values.size() == 0) { |
| 79 | throw new IllegalArgumentException("SpinnerListModel(List) expects non-null non-empty List"); |
| 80 | } |
| 81 | this.list = values; |
| 82 | this.index = 0; |
| 83 | } |
| 84 | |
| 85 | |
| 86 | /** |
| 87 | * Constructs a <code>SpinnerModel</code> whose sequence of values |
| 88 | * is defined by the specified array. The initial value of the model |
| 89 | * will be <code>values[0]</code>. If <code>values</code> is |
| 90 | * <code>null</code> or has zero length, an |
| 91 | * <code>IllegalArugmentException</code> is thrown. |
| 92 | * |
| 93 | * @param values the sequence this model represents |
| 94 | * @throws IllegalArugmentException if <code>values</code> is |
| 95 | * <code>null</code> or zero length |
| 96 | */ |
| 97 | public SpinnerListModel(Object[] values) { |
| 98 | if (values == null || values.length == 0) { |
| 99 | throw new IllegalArgumentException("SpinnerListModel(Object[]) expects non-null non-empty Object[]"); |
| 100 | } |
| 101 | this.list = Arrays.asList(values); |
| 102 | this.index = 0; |
| 103 | } |
| 104 | |
| 105 | |
| 106 | /** |
| 107 | * Constructs an effectively empty <code>SpinnerListModel</code>. |
| 108 | * The model's list will contain a single |
| 109 | * <code>"empty"</code> string element. |
| 110 | */ |
| 111 | public SpinnerListModel() { |
| 112 | this(new Object[]{"empty"}); |
| 113 | } |
| 114 | |
| 115 | |
| 116 | /** |
| 117 | * Returns the <code>List</code> that defines the sequence for this model. |
| 118 | * |
| 119 | * @return the value of the <code>list</code> property |
| 120 | * @see #setList |
| 121 | */ |
| 122 | public List<?> getList() { |
| 123 | return list; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | /** |
| 128 | * Changes the list that defines this sequence and resets the index |
| 129 | * of the models <code>value</code> to zero. Note that <code>list</code> |
| 130 | * is not copied, the model just stores a reference to it. |
| 131 | * <p> |
| 132 | * This method fires a <code>ChangeEvent</code> if <code>list</code> is |
| 133 | * not equal to the current list. |
| 134 | * |
| 135 | * @param list the sequence that this model represents |
| 136 | * @throws IllegalArgumentException if <code>list</code> is |
| 137 | * <code>null</code> or zero length |
| 138 | * @see #getList |
| 139 | */ |
| 140 | public void setList(List<?> list) { |
| 141 | if ((list == null) || (list.size() == 0)) { |
| 142 | throw new IllegalArgumentException("invalid list"); |
| 143 | } |
| 144 | if (!list.equals(this.list)) { |
| 145 | this.list = list; |
| 146 | index = 0; |
| 147 | fireStateChanged(); |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | |
| 152 | /** |
| 153 | * Returns the current element of the sequence. |
| 154 | * |
| 155 | * @return the <code>value</code> property |
| 156 | * @see SpinnerModel#getValue |
| 157 | * @see #setValue |
| 158 | */ |
| 159 | public Object getValue() { |
| 160 | return list.get(index); |
| 161 | } |
| 162 | |
| 163 | |
| 164 | /** |
| 165 | * Changes the current element of the sequence and notifies |
| 166 | * <code>ChangeListeners</code>. If the specified |
| 167 | * value is not equal to an element of the underlying sequence |
| 168 | * then an <code>IllegalArgumentException</code> is thrown. |
| 169 | * In the following example the <code>setValue</code> call |
| 170 | * would cause an exception to be thrown: |
| 171 | * <pre> |
| 172 | * String[] values = {"one", "two", "free", "four"}; |
| 173 | * SpinnerModel model = new SpinnerListModel(values); |
| 174 | * model.setValue("TWO"); |
| 175 | * </pre> |
| 176 | * |
| 177 | * @param elt the sequence element that will be model's current value |
| 178 | * @throws IllegalArgumentException if the specified value isn't allowed |
| 179 | * @see SpinnerModel#setValue |
| 180 | * @see #getValue |
| 181 | */ |
| 182 | public void setValue(Object elt) { |
| 183 | int index = list.indexOf(elt); |
| 184 | if (index == -1) { |
| 185 | throw new IllegalArgumentException("invalid sequence element"); |
| 186 | } |
| 187 | else if (index != this.index) { |
| 188 | this.index = index; |
| 189 | fireStateChanged(); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | |
| 194 | /** |
| 195 | * Returns the next legal value of the underlying sequence or |
| 196 | * <code>null</code> if value is already the last element. |
| 197 | * |
| 198 | * @return the next legal value of the underlying sequence or |
| 199 | * <code>null</code> if value is already the last element |
| 200 | * @see SpinnerModel#getNextValue |
| 201 | * @see #getPreviousValue |
| 202 | */ |
| 203 | public Object getNextValue() { |
| 204 | return (index >= (list.size() - 1)) ? null : list.get(index + 1); |
| 205 | } |
| 206 | |
| 207 | |
| 208 | /** |
| 209 | * Returns the previous element of the underlying sequence or |
| 210 | * <code>null</code> if value is already the first element. |
| 211 | * |
| 212 | * @return the previous element of the underlying sequence or |
| 213 | * <code>null</code> if value is already the first element |
| 214 | * @see SpinnerModel#getPreviousValue |
| 215 | * @see #getNextValue |
| 216 | */ |
| 217 | public Object getPreviousValue() { |
| 218 | return (index <= 0) ? null : list.get(index - 1); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | /** |
| 223 | * Returns the next object that starts with <code>substring</code>. |
| 224 | * |
| 225 | * @param substring the string to be matched |
| 226 | * @return the match |
| 227 | */ |
| 228 | Object findNextMatch(String substring) { |
| 229 | int max = list.size(); |
| 230 | |
| 231 | if (max == 0) { |
| 232 | return null; |
| 233 | } |
| 234 | int counter = index; |
| 235 | |
| 236 | do { |
| 237 | Object value = list.get(counter); |
| 238 | String string = value.toString(); |
| 239 | |
| 240 | if (string != null && string.startsWith(substring)) { |
| 241 | return value; |
| 242 | } |
| 243 | counter = (counter + 1) % max; |
| 244 | } while (counter != index); |
| 245 | return null; |
| 246 | } |
| 247 | } |