1 | /**********************************************************************
|
---|
2 | *
|
---|
3 | * Phind.java -- the Phind java applet
|
---|
4 | *
|
---|
5 | * Copyright 1997-2000 Gordon W. Paynter
|
---|
6 | * Copyright 2000 The New Zealand Digital Library Project
|
---|
7 | *
|
---|
8 | * A component of the Greenstone digital library software
|
---|
9 | * from the New Zealand Digital Library Project at the
|
---|
10 | * University of Waikato, New Zealand.
|
---|
11 | *
|
---|
12 | * This program is free software; you can redistribute it and/or modify
|
---|
13 | * it under the terms of the GNU General Public License as published by
|
---|
14 | * the Free Software Foundation; either version 2 of the License, or
|
---|
15 | * (at your option) any later version.
|
---|
16 | *
|
---|
17 | * This program is distributed in the hope that it will be useful,
|
---|
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
20 | * GNU General Public License for more details.
|
---|
21 | *
|
---|
22 | * You should have received a copy of the GNU General Public License
|
---|
23 | * along with this program; if not, write to the Free Software
|
---|
24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
---|
25 | *
|
---|
26 | *********************************************************************/
|
---|
27 |
|
---|
28 |
|
---|
29 | /*********************************************************************
|
---|
30 |
|
---|
31 | To use the applet, you'll need to embed it in a web page as follows:
|
---|
32 |
|
---|
33 | <APPLET CODE="Phind.class" WIDTH=500 HEIGHT=500>
|
---|
34 | <PARAM NAME=phindcgi VALUE="http://kowhai/cgi-bin/phindcgi">
|
---|
35 | <PARAM NAME=library VALUE="http://kowhai/cgi-bin/library">
|
---|
36 | <PARAM NAME=backdrop VALUE="http://kowhai/~paynter/transfer/phindtest/green1.jpg">
|
---|
37 | <PARAM NAME=collection VALUE="fao.org">
|
---|
38 | <PARAM NAME=orientation VALUE="vertical">
|
---|
39 | <PARAM NAME=depth VALUE="2">
|
---|
40 | <PARAM NAME=fontsize VALUE="12">
|
---|
41 | <PARAM NAME=blocksize VALUE="10">
|
---|
42 | The Phind java applet.
|
---|
43 | </APPLET>
|
---|
44 |
|
---|
45 | You may have problems with Java applet security. Java applet's can only
|
---|
46 | open socket connections (including the HTTP connections the applet uses
|
---|
47 | to get data) to the same server the applet was loaded from. This means
|
---|
48 | that your phindcgi, library, and (optional) backdrop URLs must be on the
|
---|
49 | same machine that your web page was loaded from.
|
---|
50 |
|
---|
51 | **********************************************************************
|
---|
52 |
|
---|
53 | The applet comprises several classes:
|
---|
54 |
|
---|
55 | 1. Phind (this file) is the applet class, loaded by the browser.
|
---|
56 | It also handles network connections.
|
---|
57 | 2. ResultDisplay is a Panel that sits in the applet and displays
|
---|
58 | things; displays are connected in a doubly-linked list.
|
---|
59 | 3. ResultBox holds the results of a query. Result boxes are shown
|
---|
60 | to the user through ResultDisplays. Another doubly-linked list.
|
---|
61 | 4. ResultTitle acts as a caption to a ResultBox describing its contents.
|
---|
62 | 5. ResultCanvas is what the ResultBox data is drawn on. It draws the
|
---|
63 | words on the screen, and handles user input from the mouse.
|
---|
64 | 6. ResultItem represents a single result object (a phrase or document).
|
---|
65 | 7. PhindTitle is for drawing backdrops in ResultDisplays.
|
---|
66 |
|
---|
67 | **********************************************************************/
|
---|
68 |
|
---|
69 |
|
---|
70 | import java.awt.BorderLayout;
|
---|
71 | import java.awt.Button;
|
---|
72 | import java.awt.Choice;
|
---|
73 | import java.awt.Color;
|
---|
74 | import java.awt.Component;
|
---|
75 | import java.awt.Dimension;
|
---|
76 | import java.awt.Event;
|
---|
77 | import java.awt.FlowLayout;
|
---|
78 | import java.awt.Font;
|
---|
79 | import java.awt.GridLayout;
|
---|
80 | import java.awt.Image;
|
---|
81 | import java.awt.Label;
|
---|
82 | import java.awt.Panel;
|
---|
83 | import java.awt.TextField;
|
---|
84 |
|
---|
85 | import java.net.URL;
|
---|
86 | import java.io.DataInputStream;
|
---|
87 |
|
---|
88 | import java.net.Socket;
|
---|
89 | import java.net.InetAddress;
|
---|
90 | import java.net.UnknownHostException;
|
---|
91 | import java.io.IOException;
|
---|
92 |
|
---|
93 | import java.util.Vector;
|
---|
94 | import java.util.Date;
|
---|
95 |
|
---|
96 | public class Phind extends java.applet.Applet {
|
---|
97 |
|
---|
98 | // elements of the page
|
---|
99 | Label titleLabel;
|
---|
100 | TextField wordField;
|
---|
101 | Button searchButton, prevButton, nextButton;
|
---|
102 |
|
---|
103 | // Appearance parameters
|
---|
104 | public boolean vertical;
|
---|
105 | public int depth;
|
---|
106 | public int fontSize;
|
---|
107 | public Font plainFont, boldFont;
|
---|
108 |
|
---|
109 | // Do we want a background image in the applet?
|
---|
110 | String backdrop_address;
|
---|
111 | public boolean showImage;
|
---|
112 | public Image backgroundImage;
|
---|
113 |
|
---|
114 | // Holders for the downloaded data
|
---|
115 | Panel resultPanel;
|
---|
116 | ResultDisplay firstDisplay, lastDisplay;
|
---|
117 |
|
---|
118 | // the mode of operation
|
---|
119 | int mode;
|
---|
120 | final int initMode = 0;
|
---|
121 | final int idleMode = 1;
|
---|
122 | final int searchMode = 2;
|
---|
123 |
|
---|
124 | // what to search for
|
---|
125 | String collection;
|
---|
126 | int phraseBlockSize;
|
---|
127 |
|
---|
128 | //int stopwordLevel = 1;
|
---|
129 | //int lowFrequencyCutoff = 0;
|
---|
130 | //int stemming = 0;
|
---|
131 |
|
---|
132 | // where to search
|
---|
133 | Socket connection;
|
---|
134 | String library_address, phindcgi_address;
|
---|
135 | URL library, phindcgi;
|
---|
136 |
|
---|
137 | String search_url;
|
---|
138 |
|
---|
139 | // browser details
|
---|
140 | String localHost;
|
---|
141 |
|
---|
142 | // The time at which the last query finished
|
---|
143 | Date lastQueryEndTime;
|
---|
144 |
|
---|
145 | // lastQueryEndTime is stored to ensure a 1 second gap between a query
|
---|
146 | // returning and a new one beginning. It is needed because the FAO
|
---|
147 | // folks in Rome have a huge lag, and frquently click several times
|
---|
148 | // while they wait; these clicks are turned into new queries, which
|
---|
149 | // they await again. It is no elegant solution, but it seems like the
|
---|
150 | // easiest, given that I don't know threads.
|
---|
151 | // 1. The search button is easy to disable, and is disabled when a
|
---|
152 | // socket connection is in progress.
|
---|
153 | // 2. ResutCanvas widgets can'r be similarly disabled because the
|
---|
154 | // browser hides or wipes them, which looks very bad.
|
---|
155 | // 3. I cannot just ignore clicks on canvasses because the browser
|
---|
156 | // caches the clicks while the socket connection is going on, and then
|
---|
157 | // sends them through afterwards, when the canvas is accepting clicks
|
---|
158 | // again.
|
---|
159 | // 4. Current sequence of events is to record the time the last query
|
---|
160 | // ends, then whenever a click happens make sure a second has past. if
|
---|
161 | // you double-click the the first query is sent, returns, end-tie is
|
---|
162 | // set, and the second (and any others made during query time) is
|
---|
163 | // *immediately* processed, but since 1 second hasn't past it is
|
---|
164 | // ignored.
|
---|
165 |
|
---|
166 |
|
---|
167 | public String getAppletInfo() {
|
---|
168 | return "Phind by Gordon Paynter ([email protected]). Copyright 1997-2000.";
|
---|
169 | }
|
---|
170 |
|
---|
171 | public void init() {
|
---|
172 |
|
---|
173 | // default search variable values
|
---|
174 | mode = initMode;
|
---|
175 | lastQueryEndTime = new Date();
|
---|
176 |
|
---|
177 | // What is this collection called?
|
---|
178 | try {
|
---|
179 | collection = new String(getParameter("collection"));
|
---|
180 | } catch (Exception e) {
|
---|
181 | System.err.println("Phind: You must specify a collection.");
|
---|
182 | stop();
|
---|
183 | }
|
---|
184 | System.out.println("Phind collection: " + collection);
|
---|
185 |
|
---|
186 | // Where do we get the phind data
|
---|
187 | try {
|
---|
188 | phindcgi_address = new String(getParameter("phindcgi"));
|
---|
189 | } catch (Exception e) {
|
---|
190 | System.err.println("Phind: You must specify a URL for phindcgi.");
|
---|
191 | stop();
|
---|
192 | }
|
---|
193 | System.out.println("Phind phindcgi: " + phindcgi_address);
|
---|
194 |
|
---|
195 | // Where is the collection served from
|
---|
196 | try {
|
---|
197 | library_address = new String(getParameter("library"));
|
---|
198 | } catch (Exception e) {
|
---|
199 | System.err.println("Phind: You must specify a URL for library.");
|
---|
200 | stop();
|
---|
201 | }
|
---|
202 | System.out.println("Phind library: " + library_address);
|
---|
203 |
|
---|
204 | // Should we display a background image?
|
---|
205 | showImage = false;
|
---|
206 | try {
|
---|
207 | backdrop_address = new String(getParameter("backdrop"));
|
---|
208 | URL backdrop_url = new URL(backdrop_address);
|
---|
209 | backgroundImage = getImage(backdrop_url);
|
---|
210 | showImage = true;
|
---|
211 | System.out.println("Phind backdrop: " + backdrop_address);
|
---|
212 | } catch (Exception e) {
|
---|
213 | System.out.println("Phind backdrop not set");
|
---|
214 | }
|
---|
215 |
|
---|
216 | // Is there a search URL for this collection?
|
---|
217 | try {
|
---|
218 | search_url = new String(getParameter("search_url"));
|
---|
219 | System.out.println("Phind search URL: " + search_url);
|
---|
220 | } catch (Exception e) {
|
---|
221 | System.out.println("Phind search_url not set.");
|
---|
222 | }
|
---|
223 |
|
---|
224 | // Are the windows arranged vertically or horizontally
|
---|
225 | vertical = true;
|
---|
226 | try {
|
---|
227 | if (getParameter("orientation").toLowerCase().startsWith("h")) {
|
---|
228 | vertical = false;
|
---|
229 | System.out.println("Phind orientation: horizontal");
|
---|
230 | }
|
---|
231 | } catch (Exception e) {
|
---|
232 | System.out.println("Phind orientation: vertical");
|
---|
233 | }
|
---|
234 |
|
---|
235 | // How many phind windows are there?
|
---|
236 | Integer temp;
|
---|
237 | try {
|
---|
238 | temp = Integer.valueOf(getParameter("depth"));
|
---|
239 | depth = temp.intValue();
|
---|
240 | } catch (Exception e) {
|
---|
241 | temp = null;
|
---|
242 | depth = 3;
|
---|
243 | }
|
---|
244 | System.out.println("Phind depth: " + depth);
|
---|
245 |
|
---|
246 | // How many phrases should we fetch at any given time?
|
---|
247 | try {
|
---|
248 | temp = Integer.valueOf(getParameter("blocksize"));
|
---|
249 | phraseBlockSize = temp.intValue();
|
---|
250 | } catch (Exception e) {
|
---|
251 | temp = null;
|
---|
252 | phraseBlockSize = 10;
|
---|
253 | }
|
---|
254 | System.out.println("Phind phrase block size: " + phraseBlockSize);
|
---|
255 |
|
---|
256 | // How large should the font be?
|
---|
257 | try {
|
---|
258 | temp = Integer.valueOf(getParameter("fontsize"));
|
---|
259 | fontSize = temp.intValue();
|
---|
260 | } catch (Exception e) {
|
---|
261 | temp = null;
|
---|
262 | fontSize = 12;
|
---|
263 | }
|
---|
264 | System.out.println("Phind font size: " + fontSize);
|
---|
265 |
|
---|
266 | // browser details
|
---|
267 | try {
|
---|
268 | localHost = InetAddress.getLocalHost().toString();
|
---|
269 | } catch (Exception e) {
|
---|
270 | localHost = "Can't get client host.";
|
---|
271 | }
|
---|
272 | System.out.println("Phind client: " + localHost);
|
---|
273 | System.out.println("");
|
---|
274 |
|
---|
275 | // The phind applet layout manager
|
---|
276 | setLayout(new BorderLayout());
|
---|
277 |
|
---|
278 | // initialise the user interface
|
---|
279 | setBackground(Color.white);
|
---|
280 | plainFont = new Font("Helvetica", Font.PLAIN, fontSize);
|
---|
281 | boldFont = new Font("Helvetica", Font.BOLD, fontSize);
|
---|
282 |
|
---|
283 | // the main Result area
|
---|
284 |
|
---|
285 | // the Panel containing the displays is in the center of the display
|
---|
286 | resultPanel = new Panel();
|
---|
287 | if (vertical) {
|
---|
288 | resultPanel.setLayout(new GridLayout(depth,1,0,2));
|
---|
289 | } else {
|
---|
290 | System.out.println("horizontal");
|
---|
291 | resultPanel.setLayout(new GridLayout(1,depth,2,0));
|
---|
292 | }
|
---|
293 | add("Center", resultPanel);
|
---|
294 |
|
---|
295 | // Create ResultDisplays and place in the interface
|
---|
296 | ResultDisplay d1, d2 = null;
|
---|
297 | firstDisplay = new ResultDisplay(this, null);
|
---|
298 | resultPanel.add(firstDisplay);
|
---|
299 |
|
---|
300 | d1 = firstDisplay;
|
---|
301 | for (int i = 2; i <= depth; i++) {
|
---|
302 | d2 = new ResultDisplay(this, d1);
|
---|
303 | resultPanel.add(d2);
|
---|
304 | d1 = d2;
|
---|
305 | }
|
---|
306 |
|
---|
307 | lastDisplay = d2;
|
---|
308 |
|
---|
309 |
|
---|
310 | // The "control panel"
|
---|
311 | Panel p1 = new Panel();
|
---|
312 | add("North", p1);
|
---|
313 | p1.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
|
---|
314 |
|
---|
315 | searchButton = new Button("Search");
|
---|
316 | searchButton.setFont(boldFont);
|
---|
317 | p1.add(searchButton);
|
---|
318 |
|
---|
319 | Label tempLabel = new Label(" for");
|
---|
320 | tempLabel.setFont(boldFont);
|
---|
321 | p1.add(tempLabel);
|
---|
322 |
|
---|
323 | wordField = new TextField(12);
|
---|
324 | wordField.setFont(boldFont);
|
---|
325 | p1.add(wordField);
|
---|
326 |
|
---|
327 | Label temp2 = new Label(" ");
|
---|
328 | p1.add(temp2);
|
---|
329 |
|
---|
330 | prevButton = new Button("Previous");
|
---|
331 | prevButton.setFont(boldFont);
|
---|
332 | prevButton.disable();
|
---|
333 | p1.add(prevButton);
|
---|
334 |
|
---|
335 | nextButton = new Button(" Next ");
|
---|
336 | nextButton.setFont(boldFont);
|
---|
337 | nextButton.disable();
|
---|
338 | p1.add(nextButton);
|
---|
339 |
|
---|
340 | // lets get started then
|
---|
341 | setStatus("Welcome to Phind.");
|
---|
342 | mode = idleMode;
|
---|
343 | }
|
---|
344 |
|
---|
345 |
|
---|
346 | void setStatus(String status) {
|
---|
347 | showStatus(status);
|
---|
348 | }
|
---|
349 |
|
---|
350 | public boolean action(Event evt, Object arg) {
|
---|
351 |
|
---|
352 | if (evt.target == searchButton) {
|
---|
353 | searchForWord();
|
---|
354 | } else if (evt.target == wordField) {
|
---|
355 | searchForWord();
|
---|
356 | } else if (evt.target == prevButton) {
|
---|
357 | shiftPrevious();
|
---|
358 | } else if (evt.target == nextButton) {
|
---|
359 | shiftNext();
|
---|
360 | } else {
|
---|
361 | System.out.println("unknown action: " + evt.toString() + ", object: " + arg.toString());
|
---|
362 | }
|
---|
363 | return true;
|
---|
364 | }
|
---|
365 |
|
---|
366 |
|
---|
367 | // Search for a word
|
---|
368 | //
|
---|
369 | // called when the "Search" Button is pressed
|
---|
370 | void searchForWord() {
|
---|
371 |
|
---|
372 | if (mode == idleMode) {
|
---|
373 |
|
---|
374 | // transform the word to an appropriate search key
|
---|
375 | String searchWord = wordField.getText().trim().toLowerCase();
|
---|
376 | for (int i = 0; i < searchWord.length(); i++) {
|
---|
377 | if ((searchWord.charAt(i) < 'a') || (searchWord.charAt(i) > 'z')) {
|
---|
378 | searchWord = searchWord.substring(0, i);
|
---|
379 | }
|
---|
380 | }
|
---|
381 | wordField.setText(searchWord);
|
---|
382 |
|
---|
383 | // look up the word
|
---|
384 | if (searchWord.length() > 1) {
|
---|
385 | setStatus("searching for \"" + searchWord + "\"");
|
---|
386 | firstDisplay.emptyContents();
|
---|
387 | ResultBox result = lookupPhraseOnServer(null, false, searchWord, searchWord, 2);
|
---|
388 |
|
---|
389 | // if there is an error, return
|
---|
390 | if (result == null) {
|
---|
391 | setStatus("No results for \"" + searchWord + "\"");
|
---|
392 | return;
|
---|
393 | }
|
---|
394 |
|
---|
395 | // display the result
|
---|
396 | result.display = firstDisplay.display(result);
|
---|
397 | result.resize(result.display.size());
|
---|
398 | result.paintAll(result.getGraphics());
|
---|
399 | }
|
---|
400 |
|
---|
401 | enablePreviousAndNext();
|
---|
402 | }
|
---|
403 | }
|
---|
404 |
|
---|
405 |
|
---|
406 | // Search for a phrase
|
---|
407 | //
|
---|
408 | // If querymode is 2, the user has clicked on a phrase.
|
---|
409 | // If querymode is 3, the user has requested more phrases.
|
---|
410 | // If querymode is 4, the user has requested more documents.
|
---|
411 | void searchForPhrase(ResultBox source, String key, String phrase, int queryMode) {
|
---|
412 |
|
---|
413 | // System.out.println("searchForPhrase: " + key + " " + phrase + " " + queryMode);
|
---|
414 |
|
---|
415 | if (mode == idleMode) {
|
---|
416 |
|
---|
417 | // If we are going to replace the next ResultDisplay, then empty it
|
---|
418 | if (queryMode <= 2) {
|
---|
419 | if (source.display.next != null) source.display.next.emptyContents();
|
---|
420 | }
|
---|
421 |
|
---|
422 | // look up the word
|
---|
423 | setStatus("Searching for \"" + phrase + "\"");
|
---|
424 | ResultBox result = lookupPhraseOnServer(source, true, key, phrase, queryMode);
|
---|
425 | if (result == null) {
|
---|
426 | setStatus("No result for \"" + phrase + "\"");
|
---|
427 | return;
|
---|
428 | }
|
---|
429 |
|
---|
430 | // If this is not already displayed, display it in the last free spot
|
---|
431 | if (queryMode <= 2) {
|
---|
432 | result.display = lastDisplay.display(result);
|
---|
433 | result.resize(result.display.size());
|
---|
434 | result.paintAll(result.getGraphics());
|
---|
435 | }
|
---|
436 |
|
---|
437 | enablePreviousAndNext();
|
---|
438 | }
|
---|
439 | }
|
---|
440 |
|
---|
441 |
|
---|
442 | // Look up a phrase (or symbol) on the server
|
---|
443 | //
|
---|
444 | // Arguments are the source of the query (a ResultBox, or null if the
|
---|
445 | // query comes from hitting the search button), the key to search for
|
---|
446 | // (the text of a phrase or a symbol number), the phrase as a string,
|
---|
447 | // and the query mode.
|
---|
448 | // Query modes are:
|
---|
449 | // 0 = obsolete
|
---|
450 | // 1 = obsolete
|
---|
451 | // 2 = get first N phrases and URLs,
|
---|
452 | // 3 = get another N phrases into same window
|
---|
453 | // 4 = get another N documents into same window
|
---|
454 |
|
---|
455 | ResultBox lookupPhraseOnServer(ResultBox source,
|
---|
456 | boolean keyKnown, String key, String phrase,
|
---|
457 | int queryMode) {
|
---|
458 | searchButton.disable();
|
---|
459 | mode = searchMode;
|
---|
460 | ResultBox r = null;
|
---|
461 |
|
---|
462 | if (queryMode <= 2) {
|
---|
463 | r = new ResultBox(this, collection, key, phrase, source);
|
---|
464 | } else if ((queryMode == 3) || (queryMode == 4)) {
|
---|
465 | r = source;
|
---|
466 | }
|
---|
467 |
|
---|
468 | try {
|
---|
469 | queryServer(keyKnown, key, queryMode, r);
|
---|
470 | } catch (Exception e) {
|
---|
471 | System.out.println("Phind query error: " + e.toString());
|
---|
472 | setStatus("Query error: " + e.toString());
|
---|
473 | mode = idleMode;
|
---|
474 | searchButton.enable();
|
---|
475 | return null;
|
---|
476 | }
|
---|
477 |
|
---|
478 | // The query is finished
|
---|
479 | setStatus(r.c.numberOfPhrases + " results containing \"" + phrase + "\"");
|
---|
480 | mode = idleMode;
|
---|
481 | searchButton.enable();
|
---|
482 | lastQueryEndTime = new Date();
|
---|
483 |
|
---|
484 | return r;
|
---|
485 | }
|
---|
486 |
|
---|
487 |
|
---|
488 | // Query the phindcgi program
|
---|
489 | //
|
---|
490 | // Send a query (a word or symbol number) to the server
|
---|
491 | // Open a socket connection to the server, send it a query,
|
---|
492 | // and pass the result to a ResultBox.
|
---|
493 |
|
---|
494 | void queryServer(boolean keyKnown, String word, int queryMode, ResultBox area)
|
---|
495 | throws IOException {
|
---|
496 |
|
---|
497 | // Build the query
|
---|
498 | String query = phindcgi_address + "?x=1&c=" + collection;
|
---|
499 |
|
---|
500 | if (keyKnown) {
|
---|
501 | query = query + "&n=" + word;
|
---|
502 | } else {
|
---|
503 | query = query + "&p=" + word;
|
---|
504 | }
|
---|
505 |
|
---|
506 |
|
---|
507 | // Specify the set of results to return
|
---|
508 | int first_e = 0;
|
---|
509 | int last_e = 0;
|
---|
510 | int first_d = 0;
|
---|
511 | int last_d = 0;
|
---|
512 |
|
---|
513 | // the initial query
|
---|
514 | if (queryMode <= 2) {
|
---|
515 | last_e = phraseBlockSize;
|
---|
516 | last_d = phraseBlockSize;
|
---|
517 | }
|
---|
518 |
|
---|
519 | // add phrases to an existing result set
|
---|
520 | else if (queryMode == 3) {
|
---|
521 | first_e = area.nextPhraseBlock * phraseBlockSize;
|
---|
522 | area.nextPhraseBlock++;
|
---|
523 | last_e = area.nextPhraseBlock * phraseBlockSize;
|
---|
524 | }
|
---|
525 |
|
---|
526 | // add documents to existing result set
|
---|
527 | else if (queryMode == 4) {
|
---|
528 | first_d = area.nextDocumentBlock * phraseBlockSize;
|
---|
529 | area.nextDocumentBlock++;
|
---|
530 | last_d = area.nextDocumentBlock * phraseBlockSize;
|
---|
531 | }
|
---|
532 |
|
---|
533 | query = query + "&f=" + first_d + "&d=" + last_d
|
---|
534 | + "&g=" + first_e + "&e=" + last_e;
|
---|
535 |
|
---|
536 | // Send the query to the phindcgi program
|
---|
537 | System.out.println("sending query: " + query);
|
---|
538 | try {
|
---|
539 | phindcgi = new URL(query);
|
---|
540 | DataInputStream in = new DataInputStream(phindcgi.openStream());
|
---|
541 | byte[] buffer;
|
---|
542 | int availableBytes = 0;
|
---|
543 |
|
---|
544 | while (!area.finished) {
|
---|
545 | availableBytes = in.available();
|
---|
546 | if (availableBytes == 0) {
|
---|
547 | // if i had threads i'd do a wait here for 1 second
|
---|
548 | } else {
|
---|
549 | buffer = new byte[availableBytes];
|
---|
550 | in.read(buffer);
|
---|
551 | area.parseBytes(buffer);
|
---|
552 | }
|
---|
553 | }
|
---|
554 |
|
---|
555 | in.close();
|
---|
556 | } catch (Exception e) {
|
---|
557 | System.err.println( "Error sending query to phindcgi: " + e);
|
---|
558 | }
|
---|
559 | area.repaint();
|
---|
560 | }
|
---|
561 |
|
---|
562 |
|
---|
563 | // Previous and Next button functionality
|
---|
564 |
|
---|
565 | // enable or disable the "Previous" and "Next" buttons
|
---|
566 | void enablePreviousAndNext() {
|
---|
567 |
|
---|
568 | Component c = firstDisplay.current;
|
---|
569 | if (c.getClass().getName().equals("ResultBox")) {
|
---|
570 | if (((ResultBox) c).prevBoxExists()) {
|
---|
571 | prevButton.enable();
|
---|
572 | } else {
|
---|
573 | prevButton.disable();
|
---|
574 | }
|
---|
575 | }
|
---|
576 |
|
---|
577 | c = lastDisplay.current;
|
---|
578 | if (c.getClass().getName().equals("ResultBox")) {
|
---|
579 | if (((ResultBox) c).nextBoxExists()) {
|
---|
580 | nextButton.enable();
|
---|
581 | } else {
|
---|
582 | nextButton.disable();
|
---|
583 | }
|
---|
584 | }
|
---|
585 | }
|
---|
586 |
|
---|
587 | // Shift to previous box
|
---|
588 | //
|
---|
589 | // If the user clicks "Previous" then scroll up.
|
---|
590 | void shiftPrevious() {
|
---|
591 |
|
---|
592 | Component c = firstDisplay.current;
|
---|
593 | if (c.getClass().getName().equals("ResultBox")) {
|
---|
594 |
|
---|
595 | ResultBox b = (ResultBox) c;
|
---|
596 | if (b.prevBoxExists()) {
|
---|
597 | b = b.prev;
|
---|
598 |
|
---|
599 | // empty all the displays
|
---|
600 | firstDisplay.emptyContents();
|
---|
601 |
|
---|
602 | // add as many result boxes as there are displays
|
---|
603 | for (int i = 1 ; ((i <= depth) && (b != null)); i++) {
|
---|
604 | lastDisplay.display(b);
|
---|
605 | b.resize(b.display.size());
|
---|
606 | b.paintAll(b.getGraphics());
|
---|
607 | b = b.next;
|
---|
608 | }
|
---|
609 | }
|
---|
610 | }
|
---|
611 | enablePreviousAndNext();
|
---|
612 | }
|
---|
613 |
|
---|
614 |
|
---|
615 | // Shift to next box
|
---|
616 | //
|
---|
617 | // If the user clicks "Next" then scroll down if possible
|
---|
618 | void shiftNext() {
|
---|
619 |
|
---|
620 | Component c = lastDisplay.current;
|
---|
621 | if (c.getClass().getName().equals("ResultBox")) {
|
---|
622 |
|
---|
623 | ResultBox b = (ResultBox) c;
|
---|
624 | if (b.nextBoxExists()) {
|
---|
625 |
|
---|
626 | // find the new "first" displayed box
|
---|
627 | c = firstDisplay.current;
|
---|
628 | b = (ResultBox) c;
|
---|
629 | b = b.next;
|
---|
630 |
|
---|
631 | // empty all the displays
|
---|
632 | firstDisplay.emptyContents();
|
---|
633 |
|
---|
634 | // add as many result boxes as there are displays
|
---|
635 | for (int i = 1 ; ((i <= depth) && (b != null)); i++) {
|
---|
636 | lastDisplay.display(b);
|
---|
637 | b.resize(b.display.size());
|
---|
638 | b.paintAll(b.getGraphics());
|
---|
639 | b = b.next;
|
---|
640 | }
|
---|
641 | }
|
---|
642 | }
|
---|
643 | enablePreviousAndNext();
|
---|
644 | }
|
---|
645 |
|
---|
646 | }
|
---|