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1
15 package org.apache.tapestry.describe;
16
17 import java.util.Collection  ;
18 import java.util.Iterator ;
19
20 import org.apache.hivemind.util.Defense;
21 import org.apache.tapestry.IMarkupWriter;
22
23
33 public class HTMLDescriptionReceiver implements DescriptionReceiver
34 {
35
37 static final String NULL_VALUE = "<NULL>";
38
39 private IMarkupWriter _writer;
40
41 private boolean _emitDefault = true;
42
43 private String _title;
44
45 private String _section;
46
47 private DescribableStrategy _strategy;
48
49 private HTMLDescriptionReceiverStyles _styles;
50
51 public HTMLDescriptionReceiver(IMarkupWriter writer, DescribableStrategy adapter)
52 {
53 this(writer, adapter, new HTMLDescriptionReceiverStyles());
54 }
55
56 public HTMLDescriptionReceiver(IMarkupWriter writer, DescribableStrategy strategy,
57 HTMLDescriptionReceiverStyles styles)
58 {
59 Defense.notNull(writer, "writer");
60 Defense.notNull(strategy, "strategy");
61 Defense.notNull(styles, "styles");
62
63 _writer = writer;
64 _strategy = strategy;
65 _styles = styles;
66 }
67
68 public void describe(Object object)
69 {
70 if (object == null)
71 {
72 _writer.print(NULL_VALUE);
73 return;
74 }
75
76 _strategy.describeObject(object, this);
77
78 finishUp(object);
79 }
80
81 public void describeAlternate(Object alternate)
82 {
83 _strategy.describeObject(alternate, this);
84 }
85
86 void finishUp(Object object)
87 {
88 if (_emitDefault)
89 {
90 String value = _title != null ? _title : object.toString();
91
92 _writer.print(value);
93 }
94 else
97 _writer.end("table");
98
99 _writer.println();
100 }
101
102 public void title(String title)
103 {
104 Defense.notNull(title, "title");
105
106 if (_title != null)
107 throw new IllegalStateException (DescribeMessages.setTitleOnce());
108
109 _title = title;
110 }
111
112 public void section(String section)
113 {
114 Defense.notNull(section, "section");
115
116 if (_title == null)
117 throw new IllegalStateException (DescribeMessages.mustSetTitleBeforeSection());
118
119 _section = section;
120 }
121
122 private void assertTitleSet()
123 {
124 if (_title == null)
125 throw new IllegalStateException (DescribeMessages.mustSetTitleBeforeProperty());
126 }
127
128 private void emitSection()
129 {
130 if (_emitDefault)
131 {
132 _emitDefault = false;
133
134 _writer.begin("div");
135 _writer.attribute("class", _styles.getHeaderClass());
136 _writer.print(_title);
137 _writer.end();
138 _writer.println();
139
140 _writer.begin("table");
141 _writer.attribute("class", _styles.getTableClass());
142 _writer.println();
143 }
144
145 if (_section != null)
146 {
147 _writer.begin("tr");
148 _writer.attribute("class", _styles.getSubheaderClass());
149 _writer.begin("th");
150 _writer.attribute("colspan", 2);
151 _writer.print(_section);
152 _writer.end("tr");
153 _writer.println();
154
155 _section = null;
156 }
157 }
158
159 private void pair(String key, String value)
160 {
161 assertTitleSet();
162 emitSection();
163
164 _writer.begin("tr");
165 _writer.begin("th");
166 _writer.print(key);
167 _writer.end();
168 _writer.begin("td");
169 _writer.print(value);
170 _writer.end("tr");
171 _writer.println();
172 }
173
174 public void property(String key, Object value)
175 {
176 Defense.notNull(key, "key");
177
178 assertTitleSet();
179 emitSection();
180
181 _writer.begin("tr");
182 _writer.begin("th");
183 _writer.print(key);
184 _writer.end();
185 _writer.begin("td");
186
187 describeNested(value);
188
189 _writer.end("tr");
190 _writer.println();
191 }
192
193 private void describeNested(Object value)
194 {
195 if (value == null)
196 {
197 _writer.print(NULL_VALUE);
198 return;
199 }
200
201 new HTMLDescriptionReceiver(_writer, _strategy, _styles).describe(value);
202 }
203
204 public void property(String key, boolean value)
205 {
206 Defense.notNull(key, "key");
207
208
210 pair(key, value ? "true" : "false");
211 }
212
213 public void property(String key, byte value)
214 {
215 Defense.notNull(key, "key");
216
217 pair(key, Byte.toString(value));
218 }
219
220 public void property(String key, short value)
221 {
222 Defense.notNull(key, "key");
223
224 pair(key, Short.toString(value));
225 }
226
227 public void property(String key, int value)
228 {
229 Defense.notNull(key, "key");
230
231 pair(key, Integer.toString(value));
232 }
233
234 public void property(String key, long value)
235 {
236 Defense.notNull(key, "key");
237
238 pair(key, Long.toString(value));
239 }
240
241 public void property(String key, float value)
242 {
243 Defense.notNull(key, "key");
244
245 pair(key, Float.toString(value));
246 }
247
248 public void property(String key, double value)
249 {
250 Defense.notNull(key, "key");
251
252 pair(key, Double.toString(value));
253 }
254
255 public void property(String key, char value)
256 {
257 Defense.notNull(key, "key");
258
259 pair(key, Character.toString(value));
260 }
261
262 public void array(String key, Object [] values)
263 {
264 Defense.notNull(key, "key");
265
266 assertTitleSet();
267
268 if (values == null || values.length == 0)
269 return;
270
271 emitSection();
272
273 for (int i = 0; i < values.length; i++)
274 {
275 _writer.begin("tr");
276 _writer.begin("th");
277
278 if (i == 0)
279 _writer.print(key);
280
281 _writer.end();
282
283 _writer.begin("td");
284
285 describeNested(values[i]);
286
287 _writer.end("tr");
288 _writer.println();
289 }
290
291 }
292
293 public void collection(String key, Collection values)
294 {
295 Defense.notNull(key, "key");
296
297 assertTitleSet();
298
299 if (values == null || values.isEmpty())
300 return;
301
302 emitSection();
303
304 Iterator i = values.iterator();
305 boolean first = true;
306
307 while (i.hasNext())
308 {
309 _writer.begin("tr");
310 _writer.begin("th");
311
312 if (first)
313 _writer.print(key);
314
315 _writer.end();
316 _writer.begin("td");
317
318 describeNested(i.next());
319
320 _writer.end("tr");
321 _writer.println();
322
323 first = false;
324 }
325 }
326 } |
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