1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 /**
18 * @author Alexey A. Ivanov
19 */
20 package javax.swing.text.html;
21
22 import java.util.Collections;
23 import java.util.Enumeration;
24 import java.util.Iterator;
25 import java.util.LinkedList;
26 import java.util.List;
27 import java.util.NoSuchElementException;
28
29 import javax.swing.event.ChangeListener;
30 import javax.swing.text.AttributeSet;
31 import javax.swing.text.Element;
32 import javax.swing.text.Style;
33 import javax.swing.text.StyleConstants;
34
35 import org.apache.harmony.x.swing.internal.nls.Messages;
36
37 /**
38 * Storage for all the attributes applicable for the
39 * {@link javax.swing.text.Element} for which CascadedStyle
40 * is built. Applicability is defined by CSS1 specification (http://www.w3.org/TR/CSS1).
41 */
42 final class CascadedStyle implements Style {
43 private final StyleSheet styleSheet;
44 private final List styleList;
45 private final List sheetList;
46 private final String name;
47 private final Selector selector;
48
49 CascadedStyle(final StyleSheet styleSheet, final Element element,
50 final List styleList, final Iterator sheetIt) {
51 this(styleSheet, getElementTreeSelector(element), styleList, sheetIt);
52 }
53
54 CascadedStyle(final StyleSheet styleSheet, final String name,
55 final List styleList, final Iterator sheetIt) {
56 this.styleSheet = styleSheet;
57 this.styleList = styleList;
58 this.name = name;
59 this.selector = new Selector(name);
60
61 sheetList = new LinkedList();
62 while (sheetIt.hasNext()) {
63 sheetList.add(((StyleSheet)sheetIt.next()).getRule(name));
64 }
65 }
66
67 public static String getElementTreeSelector(final Element element) {
68 final StringBuilder result = new StringBuilder();
69 result.append(getFullName(element));
70 Element parent = element.getParentElement();
71 while (parent != null) {
72 result.insert(0, ' ');
73 result.insert(0, getFullName(parent));
74 parent = parent.getParentElement();
75 }
76 return result.toString();
77 }
78
79 public static String getFullName(final Element element) {
80 HTML.Tag tag = SelectorMatcher.getTag(element);
81 if (tag == null) {
82 return getFullName(element.getParentElement());
83 }
84
85 return getFullElementName(element, tag);
86 }
87
88 public static String getFullElementName(final Element element) {
89 HTML.Tag tag = SelectorMatcher.getTag(element);
90 if (tag == null) {
91 return null;
92 }
93
94 return getFullElementName(element, tag);
95 }
96
97 public static String getFullElementName(final Element element,
98 final HTML.Tag tag) {
99 final String tagName = tag.toString();
100 final String id = SelectorMatcher.getID(tag, element);
101 final String clazz = SelectorMatcher.getClass(tag, element);
102
103 final StringBuilder result = new StringBuilder();
104 if (tagName != null) {
105 result.append(tagName);
106 }
107 if (id != null) {
108 result.append('#').append(id);
109 }
110 if (clazz != null) {
111 result.append('.').append(clazz);
112 }
113
114 return result.toString();
115 }
116
117 public String getName() {
118 return name;
119 }
120
121 public void addChangeListener(final ChangeListener arg0) {
122 }
123
124 public void removeChangeListener(final ChangeListener arg0) {
125 }
126
127 public void removeAttribute(final Object arg0) {
128 // throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
129 }
130
131 public void removeAttributes(final Enumeration arg0) {
132 // throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
133 }
134
135 public void addAttributes(final AttributeSet arg0) {
136 // throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
137 }
138
139 public void removeAttributes(final AttributeSet arg0) {
140 // throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
141 }
142
143 public void setResolveParent(final AttributeSet arg0) {
144 // throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
145 }
146
147 public void addAttribute(final Object arg0, final Object arg1) {
148 // throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
149 }
150
151 public int getAttributeCount() {
152 Iterator it = styleList.iterator();
153 int result = 0;
154 while (it.hasNext()) {
155 result += styleSheet.getStyle(it.next().toString())
156 .getAttributeCount();
157 }
158
159 it = sheetList.iterator();
160 while (it.hasNext()) {
161 result += ((AttributeSet)it.next()).getAttributeCount();
162 }
163 return result;
164 }
165
166 public boolean isDefined(final Object arg0) {
167 Iterator it = styleList.iterator();
168 boolean result = false;
169 while (!result && it.hasNext()) {
170 Style style = styleSheet.getStyle(it.next().toString());
171 result = style.isDefined(arg0);
172 }
173 if (result) {
174 return result;
175 }
176
177 it = sheetList.iterator();
178 while (!result && it.hasNext()) {
179 result = ((AttributeSet)it.next()).isDefined(arg0);
180 }
181 return result;
182 }
183
184 public Enumeration getAttributeNames() {
185 return new Enumeration() {
186 private final Iterator styleIt = styleList.iterator();
187 private final Iterator sheetIt = sheetList.iterator();
188 private Enumeration current;
189
190 public boolean hasMoreElements() {
191 return styleIt.hasNext()
192 || current != null && current.hasMoreElements()
193 || hasAttributesInSheets();
194 }
195
196 public Object nextElement() {
197 if (current != null && current.hasMoreElements()) {
198 return current.nextElement();
199 }
200 if (styleIt.hasNext()) {
201 current = getAttributeNamesOfNextStyle();
202 return nextElement();
203 }
204 if (hasAttributesInSheets()) {
205 return current.nextElement();
206 }
207
208 throw new NoSuchElementException();
209 }
210
211 private boolean hasAttributesInSheets() {
212 if (sheetIt.hasNext()) {
213 current =
214 ((AttributeSet)sheetIt.next()).getAttributeNames();
215 }
216 return current != null && current.hasMoreElements();
217 }
218
219 private Enumeration getAttributeNamesOfNextStyle() {
220 return styleSheet.getStyle(styleIt.next().toString())
221 .getAttributeNames();
222 }
223 };
224 }
225
226 public AttributeSet copyAttributes() {
227 throw new UnsupportedOperationException(Messages.getString("swing.27")); //$NON-NLS-1$
228 }
229
230 public AttributeSet getResolveParent() {
231 return (AttributeSet)getAttribute(StyleConstants.ResolveAttribute);
232 }
233
234 public boolean containsAttributes(final AttributeSet arg0) {
235 boolean result = true;
236 final Enumeration keys = arg0.getAttributeNames();
237 while (result && keys.hasMoreElements()) {
238 Object key = keys.nextElement();
239 Object value = arg0.getAttribute(key);
240 result = containsAttribute(key, value);
241 }
242 return result;
243 }
244
245 public boolean isEqual(final AttributeSet arg0) {
246 if (getAttributeCount() != arg0.getAttributeCount()) {
247 return false;
248 }
249 return containsAttributes(arg0);
250 }
251
252 public Object getAttribute(final Object key) {
253 Iterator it = styleList.iterator();
254 Object result = null;
255 while (result == null && it.hasNext()) {
256 Style style = styleSheet.getStyle(it.next().toString());
257 result = style.getAttribute(key);
258 }
259 if (result != null) {
260 return result;
261 }
262 it = sheetList.iterator();
263 while (result == null && it.hasNext()) {
264 result = ((AttributeSet)it.next()).getAttribute(key);
265 }
266 return result;
267 }
268
269 public Object getAttribute(final Object key, final Element element) {
270 if (!(key instanceof CSS.Attribute)
271 || ((CSS.Attribute)key).isInherited()) {
272
273 return getAttribute(key);
274 }
275 final String elementName = getFullElementName(element);
276 if (elementName == null) {
277 return null;
278 }
279 final SimpleSelector elementSelector = new SimpleSelector(elementName);
280
281 Iterator it = styleList.iterator();
282 Object result = null;
283 while (result == null && it.hasNext()) {
284 Selector styleSelector = (Selector)it.next();
285 if (!elementSelector.applies(styleSelector.getLastSelector())) {
286 continue;
287 }
288 Style style = styleSheet.getStyle(styleSelector.toString());
289 result = style.getAttribute(key);
290 }
291 if (result != null) {
292 return result;
293 }
294 it = sheetList.iterator();
295 while (result == null && it.hasNext()) {
296 result = ((AttributeSet)it.next()).getAttribute(key);
297 }
298 return result;
299 }
300
301 public boolean containsAttribute(final Object arg0, final Object arg1) {
302 Iterator it = styleList.iterator();
303 boolean result = false;
304 while (!result && it.hasNext()) {
305 Style style = styleSheet.getStyle(it.next().toString());
306 result = style.containsAttribute(arg0, arg1);
307 }
308 if (result) {
309 return result;
310 }
311 it = sheetList.iterator();
312 while (!result && it.hasNext()) {
313 result = ((AttributeSet)it.next()).containsAttribute(arg0, arg1);
314 }
315 return result;
316 }
317
318 void addStyle(final String styleName) {
319 Selector styleSelector = new Selector(styleName);
320 if (selector.applies(styleSelector)) {
321 styleList.add(styleSelector);
322 Collections.sort(styleList, SpecificityComparator.compator);
323 }
324 }
325
326 void removeStyle(final String styleName) {
327 Iterator it = styleList.iterator();
328 while (it.hasNext()) {
329 Selector s = (Selector)it.next();
330 if (styleName.equals(s.toString())) {
331 it.remove();
332 break;
333 }
334 }
335 }
336
337 void addStyleSheet(final StyleSheet ss) {
338 sheetList.add(0, ss.getRule(name));
339 }
340
341 void removeStyleSheet(final StyleSheet ss) {
342 final Iterator it = sheetList.iterator();
343 while (it.hasNext()) {
344 CascadedStyle rs = (CascadedStyle)it.next();
345 if (rs.styleSheet == ss) {
346 it.remove();
347 break;
348 }
349 }
350 }
351 }