J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001 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 | package javax.swing.text.html; |
| 26 | |
| 27 | import javax.swing.text.*; |
| 28 | import java.io.Serializable; |
| 29 | import java.util.*; |
| 30 | |
| 31 | /** |
| 32 | * An implementation of <code>AttributeSet</code> that can multiplex |
| 33 | * across a set of <code>AttributeSet</code>s. |
| 34 | * |
| 35 | */ |
| 36 | class MuxingAttributeSet implements AttributeSet, Serializable { |
| 37 | /** |
| 38 | * Creates a <code>MuxingAttributeSet</code> with the passed in |
| 39 | * attributes. |
| 40 | */ |
| 41 | public MuxingAttributeSet(AttributeSet[] attrs) { |
| 42 | this.attrs = attrs; |
| 43 | } |
| 44 | |
| 45 | /** |
| 46 | * Creates an empty <code>MuxingAttributeSet</code>. This is intended for |
| 47 | * use by subclasses only, and it is also intended that subclasses will |
| 48 | * set the constituent <code>AttributeSet</code>s before invoking any |
| 49 | * of the <code>AttributeSet</code> methods. |
| 50 | */ |
| 51 | protected MuxingAttributeSet() { |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Directly sets the <code>AttributeSet</code>s that comprise this |
| 56 | * <code>MuxingAttributeSet</code>. |
| 57 | */ |
| 58 | protected synchronized void setAttributes(AttributeSet[] attrs) { |
| 59 | this.attrs = attrs; |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Returns the <code>AttributeSet</code>s multiplexing too. When the |
| 64 | * <code>AttributeSet</code>s need to be referenced, this should be called. |
| 65 | */ |
| 66 | protected synchronized AttributeSet[] getAttributes() { |
| 67 | return attrs; |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Inserts <code>as</code> at <code>index</code>. This assumes |
| 72 | * the value of <code>index</code> is between 0 and attrs.length, |
| 73 | * inclusive. |
| 74 | */ |
| 75 | protected synchronized void insertAttributeSetAt(AttributeSet as, |
| 76 | int index) { |
| 77 | int numAttrs = attrs.length; |
| 78 | AttributeSet newAttrs[] = new AttributeSet[numAttrs + 1]; |
| 79 | if (index < numAttrs) { |
| 80 | if (index > 0) { |
| 81 | System.arraycopy(attrs, 0, newAttrs, 0, index); |
| 82 | System.arraycopy(attrs, index, newAttrs, index + 1, |
| 83 | numAttrs - index); |
| 84 | } |
| 85 | else { |
| 86 | System.arraycopy(attrs, 0, newAttrs, 1, numAttrs); |
| 87 | } |
| 88 | } |
| 89 | else { |
| 90 | System.arraycopy(attrs, 0, newAttrs, 0, numAttrs); |
| 91 | } |
| 92 | newAttrs[index] = as; |
| 93 | attrs = newAttrs; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Removes the AttributeSet at <code>index</code>. This assumes |
| 98 | * the value of <code>index</code> is greater than or equal to 0, |
| 99 | * and less than attrs.length. |
| 100 | */ |
| 101 | protected synchronized void removeAttributeSetAt(int index) { |
| 102 | int numAttrs = attrs.length; |
| 103 | AttributeSet[] newAttrs = new AttributeSet[numAttrs - 1]; |
| 104 | if (numAttrs > 0) { |
| 105 | if (index == 0) { |
| 106 | // FIRST |
| 107 | System.arraycopy(attrs, 1, newAttrs, 0, numAttrs - 1); |
| 108 | } |
| 109 | else if (index < (numAttrs - 1)) { |
| 110 | // MIDDLE |
| 111 | System.arraycopy(attrs, 0, newAttrs, 0, index); |
| 112 | System.arraycopy(attrs, index + 1, newAttrs, index, |
| 113 | numAttrs - index - 1); |
| 114 | } |
| 115 | else { |
| 116 | // END |
| 117 | System.arraycopy(attrs, 0, newAttrs, 0, numAttrs - 1); |
| 118 | } |
| 119 | } |
| 120 | attrs = newAttrs; |
| 121 | } |
| 122 | |
| 123 | // --- AttributeSet methods ---------------------------- |
| 124 | |
| 125 | /** |
| 126 | * Gets the number of attributes that are defined. |
| 127 | * |
| 128 | * @return the number of attributes |
| 129 | * @see AttributeSet#getAttributeCount |
| 130 | */ |
| 131 | public int getAttributeCount() { |
| 132 | AttributeSet[] as = getAttributes(); |
| 133 | int n = 0; |
| 134 | for (int i = 0; i < as.length; i++) { |
| 135 | n += as[i].getAttributeCount(); |
| 136 | } |
| 137 | return n; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Checks whether a given attribute is defined. |
| 142 | * This will convert the key over to CSS if the |
| 143 | * key is a StyleConstants key that has a CSS |
| 144 | * mapping. |
| 145 | * |
| 146 | * @param key the attribute key |
| 147 | * @return true if the attribute is defined |
| 148 | * @see AttributeSet#isDefined |
| 149 | */ |
| 150 | public boolean isDefined(Object key) { |
| 151 | AttributeSet[] as = getAttributes(); |
| 152 | for (int i = 0; i < as.length; i++) { |
| 153 | if (as[i].isDefined(key)) { |
| 154 | return true; |
| 155 | } |
| 156 | } |
| 157 | return false; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Checks whether two attribute sets are equal. |
| 162 | * |
| 163 | * @param attr the attribute set to check against |
| 164 | * @return true if the same |
| 165 | * @see AttributeSet#isEqual |
| 166 | */ |
| 167 | public boolean isEqual(AttributeSet attr) { |
| 168 | return ((getAttributeCount() == attr.getAttributeCount()) && |
| 169 | containsAttributes(attr)); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Copies a set of attributes. |
| 174 | * |
| 175 | * @return the copy |
| 176 | * @see AttributeSet#copyAttributes |
| 177 | */ |
| 178 | public AttributeSet copyAttributes() { |
| 179 | AttributeSet[] as = getAttributes(); |
| 180 | MutableAttributeSet a = new SimpleAttributeSet(); |
| 181 | int n = 0; |
| 182 | for (int i = as.length - 1; i >= 0; i--) { |
| 183 | a.addAttributes(as[i]); |
| 184 | } |
| 185 | return a; |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Gets the value of an attribute. If the requested |
| 190 | * attribute is a StyleConstants attribute that has |
| 191 | * a CSS mapping, the request will be converted. |
| 192 | * |
| 193 | * @param key the attribute name |
| 194 | * @return the attribute value |
| 195 | * @see AttributeSet#getAttribute |
| 196 | */ |
| 197 | public Object getAttribute(Object key) { |
| 198 | AttributeSet[] as = getAttributes(); |
| 199 | int n = as.length; |
| 200 | for (int i = 0; i < n; i++) { |
| 201 | Object o = as[i].getAttribute(key); |
| 202 | if (o != null) { |
| 203 | return o; |
| 204 | } |
| 205 | } |
| 206 | return null; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Gets the names of all attributes. |
| 211 | * |
| 212 | * @return the attribute names |
| 213 | * @see AttributeSet#getAttributeNames |
| 214 | */ |
| 215 | public Enumeration getAttributeNames() { |
| 216 | return new MuxingAttributeNameEnumeration(); |
| 217 | } |
| 218 | |
| 219 | /** |
| 220 | * Checks whether a given attribute name/value is defined. |
| 221 | * |
| 222 | * @param name the attribute name |
| 223 | * @param value the attribute value |
| 224 | * @return true if the name/value is defined |
| 225 | * @see AttributeSet#containsAttribute |
| 226 | */ |
| 227 | public boolean containsAttribute(Object name, Object value) { |
| 228 | return value.equals(getAttribute(name)); |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Checks whether the attribute set contains all of |
| 233 | * the given attributes. |
| 234 | * |
| 235 | * @param attrs the attributes to check |
| 236 | * @return true if the element contains all the attributes |
| 237 | * @see AttributeSet#containsAttributes |
| 238 | */ |
| 239 | public boolean containsAttributes(AttributeSet attrs) { |
| 240 | boolean result = true; |
| 241 | |
| 242 | Enumeration names = attrs.getAttributeNames(); |
| 243 | while (result && names.hasMoreElements()) { |
| 244 | Object name = names.nextElement(); |
| 245 | result = attrs.getAttribute(name).equals(getAttribute(name)); |
| 246 | } |
| 247 | |
| 248 | return result; |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Returns null, subclasses may wish to do something more |
| 253 | * intelligent with this. |
| 254 | */ |
| 255 | public AttributeSet getResolveParent() { |
| 256 | return null; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * The <code>AttributeSet</code>s that make up the resulting |
| 261 | * <code>AttributeSet</code>. |
| 262 | */ |
| 263 | private AttributeSet[] attrs; |
| 264 | |
| 265 | |
| 266 | /** |
| 267 | * An Enumeration of the Attribute names in a MuxingAttributeSet. |
| 268 | * This may return the same name more than once. |
| 269 | */ |
| 270 | private class MuxingAttributeNameEnumeration implements Enumeration { |
| 271 | |
| 272 | MuxingAttributeNameEnumeration() { |
| 273 | updateEnum(); |
| 274 | } |
| 275 | |
| 276 | public boolean hasMoreElements() { |
| 277 | if (currentEnum == null) { |
| 278 | return false; |
| 279 | } |
| 280 | return currentEnum.hasMoreElements(); |
| 281 | } |
| 282 | |
| 283 | public Object nextElement() { |
| 284 | if (currentEnum == null) { |
| 285 | throw new NoSuchElementException("No more names"); |
| 286 | } |
| 287 | Object retObject = currentEnum.nextElement(); |
| 288 | if (!currentEnum.hasMoreElements()) { |
| 289 | updateEnum(); |
| 290 | } |
| 291 | return retObject; |
| 292 | } |
| 293 | |
| 294 | void updateEnum() { |
| 295 | AttributeSet[] as = getAttributes(); |
| 296 | currentEnum = null; |
| 297 | while (currentEnum == null && attrIndex < as.length) { |
| 298 | currentEnum = as[attrIndex++].getAttributeNames(); |
| 299 | if (!currentEnum.hasMoreElements()) { |
| 300 | currentEnum = null; |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | |
| 306 | /** Index into attrs the current Enumeration came from. */ |
| 307 | private int attrIndex; |
| 308 | /** Enumeration from attrs. */ |
| 309 | private Enumeration currentEnum; |
| 310 | } |
| 311 | } |