Source Code Cross Referenced for InvocationImpl.java in  » 6.0-JDK-Modules » j2me » com » sun » midp » content » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.midp.content 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:
027:        package com.sun.midp.content;
028:
029:        import javax.microedition.content.Registry;
030:        import javax.microedition.content.Invocation;
031:        import javax.microedition.content.ContentHandler;
032:        import javax.microedition.content.ContentHandlerException;
033:
034:        import java.io.IOException;
035:        import java.io.DataInputStream;
036:        import java.io.DataOutputStream;
037:
038:        import javax.microedition.io.Connection;
039:        import javax.microedition.io.Connector;
040:        import javax.microedition.io.HttpConnection;
041:
042:        import com.sun.midp.midlet.MIDletSuite;
043:
044:        /**
045:         * Implementation of Invocation class.
046:         * <p>
047:         * This class MUST NOT have any public methods that are not also
048:         * public in Invocation (the superclass).  The sensistive methods
049:         * of the class MUST be package private.
050:         */
051:        public final class InvocationImpl {
052:            /**
053:             * The Invocation delegating to this instance.
054:             * This field is public to Invocation can set it.
055:             * This allows the implementation to pass a InvocationImpl to
056:             * back to the Invocation class and it can wrap it in an Invocation
057:             * before passing it to the application.
058:             */
059:            public Invocation invocation;
060:
061:            /**
062:             * The URL of the content; may be <code>null</code>.
063:             * URLs of up to and including 256 characters in length MUST be
064:             * supported. A URL with a length of zero is treated as
065:             * <code>null</code> and is ignored..
066:             */
067:            String url;
068:
069:            /** The content type; may be <code>null</code>. */
070:            String type;
071:
072:            /** The content handler ID; may be <code>null</code> */
073:            String ID;
074:
075:            /** The action to perform on the content; may be <code>null</code> */
076:            String action;
077:
078:            /** The array of arguments; may be <code>null</code> */
079:            String[] arguments;
080:
081:            /** The length (returned by get0) of the argument array. */
082:            int argsLen;
083:
084:            /** The data array; may be <code>null</code>. */
085:            byte[] data;
086:
087:            /** The length (returned by get0) needed for the data array. */
088:            int dataLen;
089:
090:            /**
091:             * Set to <code>true</code> if the invoker must be notified of
092:             * completion.
093:             */
094:            boolean responseRequired;
095:
096:            /** The username in case it is needed for authentication. */
097:            String username;
098:
099:            /** The password in case it is needed for authentication. */
100:            String password;
101:
102:            /** Transaction Identifier. */
103:            int tid;
104:
105:            /** The MIDlet suite that should handle this Invocation. */
106:            int suiteId;
107:
108:            /** The classname of the MIDlet to deliver to. */
109:            String classname;
110:
111:            /**
112:             * The status of the request; one of
113:             * {@link Invocation#ACTIVE},
114:             * {@link Invocation#WAITING},
115:             * {@link Invocation#ERROR},
116:             * {@link Invocation#OK}, or
117:             * {@link Invocation#CANCELLED}.
118:             */
119:            int status;
120:
121:            /** The authority that authenticated this Invocation. */
122:            String invokingAuthority;
123:
124:            /** The ID that authenticated this Invocation. */
125:            String invokingID;
126:
127:            /** The MIDlet suite of the invoking application. */
128:            int invokingSuiteId;
129:
130:            /** The classname in the invoking MIDlet suite for the response. */
131:            String invokingClassname;
132:
133:            /** The application name of the invoking MIDlet suite. */
134:            String invokingAppName;
135:
136:            /** The previous invocation, if any. */
137:            InvocationImpl previous;
138:
139:            /** The tid of the previous Invocation, if any. */
140:            int previousTid;
141:
142:            /** A zero length array of strings to re-use when needed.  */
143:            private static final byte[] ZERO_BYTES = new byte[0];
144:
145:            /**
146:             * The DISPOSE status is used with {@link #setStatus setStatus}
147:             * to discard the native Invocation. It must not overlap with
148:             * Status values defined in the Invocation class and must match
149:             * STATUS_DISPOSE defined in invocStore.c.
150:             */
151:            static final int DISPOSE = 100;
152:
153:            /**
154:             * Create a fresh InvocationImpl.
155:             */
156:            InvocationImpl() {
157:                status = Invocation.INIT;
158:                responseRequired = true;
159:                arguments = ContentHandlerImpl.ZERO_STRINGS;
160:                data = ZERO_BYTES;
161:            }
162:
163:            /**
164:             * Create a fresh InvocationImpl that is being delegated to byte
165:             * an Invocation instance created by an application.
166:             * @param invocation the Invocation delegating to this implementation
167:             */
168:            public InvocationImpl(Invocation invocation) {
169:                this ();
170:                this .invocation = invocation;
171:            }
172:
173:            /**
174:             * Sets the argument list to a new array of Strings.  The arguments
175:             * are used by the application to communicate to the content
176:             * handler and return results from the content handler.
177:             * The values of the arguments are not checked when they are set.
178:             * Instead, they are checked during
179:             * {@link Registry#invoke Registry.invoke} to
180:             * check that none of the values are <code>null</code>.
181:             * @param args the String array; may be <code>null</code>.
182:             * A <code>null</code>
183:             * argument is treated the same as a zero-length array
184:             * @see #getArgs
185:             */
186:            public void setArgs(String[] args) {
187:                this .arguments = (args == null) ? ContentHandlerImpl.ZERO_STRINGS
188:                        : args;
189:            }
190:
191:            /**
192:             * Gets the argument list as an array of Strings. These values
193:             * are passed to the content handler and are returned from
194:             * the content handler.
195:             * The array is not copied; modifications to array elements
196:             * will be visible.
197:             * @return the arguments array, which MUST NOT be <code>null</code>
198:             * @see #setArgs
199:             */
200:            public String[] getArgs() {
201:                return arguments;
202:            }
203:
204:            /**
205:             * Sets the data used for the Invocation.  The data
206:             * is used by the application to communicate to the content
207:             * handler and return data from the content handler.
208:             * @param data the byte data array; may be <code>null</code>.
209:             * A <code>null</code> is treated the same as a zero-length array
210:             * @see #getData
211:             */
212:            public void setData(byte[] data) {
213:                this .data = (data == null) ? ZERO_BYTES : data;
214:            }
215:
216:            /**
217:             * Gets the data for the Invocation. The data
218:             * is passed to the content handler.
219:             * The content handler may modify and return the data
220:             * if it returns a response.
221:             * The array is not copied; modifications to array elements
222:             * will be visible.
223:             * @return the data array, which MUST NOT be <code>null</code>
224:             * @see #setData
225:             */
226:            public byte[] getData() {
227:                return data;
228:            }
229:
230:            /**
231:             * Gets the URL for the invocation.
232:             * The URL must be equal to the value set with {@link #setURL setURL}.
233:             * @return the URL or <code>null</code> if it has not been set
234:             * @see #setURL
235:             */
236:            public String getURL() {
237:                return url;
238:            }
239:
240:            /**
241:             * Sets the URL for the invocation.
242:             * @param url the URL to be set; may be <code>null</code>
243:             * @see #getURL
244:             */
245:            public void setURL(String url) {
246:                this .url = url;
247:            }
248:
249:            /**
250:             * Gets the content type for the Invocation.
251:             * @return the content type or <code>null</code> if it has not been set
252:             * @see #setType
253:             * @see #findType
254:             */
255:            public String getType() {
256:                return type;
257:            }
258:
259:            /**
260:             * Sets the type for the Invocation.
261:             * @param type the type to be set for the content; may be <code>null</code>
262:             * @see #getType
263:             */
264:            public void setType(String type) {
265:                this .type = type;
266:            }
267:
268:            /**
269:             * Gets the action to be performed on the content.
270:             * @return the content action or <code>null</code> if it has not been set
271:             * @see #setAction
272:             */
273:            public String getAction() {
274:                return action;
275:            }
276:
277:            /**
278:             * Sets the action to be performed on the content.
279:             * @param action the action to be performed on the content;
280:             *  may be <code>null</code>
281:             * @see #getAction
282:             */
283:            public void setAction(String action) {
284:                this .action = action;
285:            }
286:
287:            /**
288:             * Gets the <code>responseRequired</code> mode for
289:             * this Invocation.
290:             * If <code>true</code>, then the invoking application requires a
291:             * response to the Invocation.
292:             * @return the current value of the <code>responseRequired</code>
293:             * mode. If
294:             * <code>true</code>, then a response must be returned to the
295:             * invoking application.
296:             * @see #setResponseRequired
297:             */
298:            public boolean getResponseRequired() {
299:                return responseRequired;
300:            }
301:
302:            /**
303:             * Sets the <code>responseRequired</code> mode for
304:             * this Invocation.
305:             * If <code>true</code>, then the invoking application requires a
306:             * response to the Invocation.
307:             * The value in the request can be changed only if the status is
308:             * <code>INIT</code>.
309:             * @param responseRequired
310:             * <code>true</code> to require a response,
311:             * <code>false</code> otherwise
312:             * @exception IllegalStateException is thrown if the status is not
313:             *        <code>INIT</code>
314:             * @see #getResponseRequired
315:             */
316:            public void setResponseRequired(boolean responseRequired) {
317:                if (getStatus() != Invocation.INIT) {
318:                    throw new IllegalStateException();
319:                }
320:                this .responseRequired = responseRequired;
321:            }
322:
323:            /**
324:             * Gets the content handler ID for this Invocation.
325:             * @see Registry#forID
326:             * @return the ID of the ContentHandler; may be
327:             * <code>null</code>
328:             * @see #setID
329:             */
330:            public String getID() {
331:                return ID;
332:            }
333:
334:            /**
335:             * Sets the ID of the content handler for this Invocation.
336:             * @param ID of the content handler; may be <code>null</code>
337:             * @see #getID
338:             */
339:            public void setID(String ID) {
340:                this .ID = ID;
341:            }
342:
343:            /**
344:             * Checks this Invocation and uses the ID, type, URL, and action
345:             * find a matching ContentHandler and queue this request to it.
346:             * The actual launching of the application is done in the Registry.
347:             *
348:             * If the <code>previous</code> Invocation is <code>null</code> then
349:             * a new transaction is created; otherwise, this
350:             * Invocation will use the same transaction as the
351:             * <code>previous</code> Invocation.
352:             * <p>
353:             * The status of this Invocation must be <code>INIT</code>.
354:             * If there is a previous Invocation, that Invocation must
355:             * have a status of <code>ACTIVE</code>.
356:             * <p>
357:             * Candidate content handlers are found as described in
358:             * {@link Registry#findHandler Registry.findHandler}.
359:             * If any handlers are
360:             * found, one is arbitrarily selected for this Invocation.
361:             * <p>
362:             * The status of this Invocation is set to <code>WAITING</code>.
363:             * If there is a non-null previous Invocation,
364:             * its status is set to <code>HOLD</code>.
365:             * A copy of the Invocation is made, the status is set to
366:             * <code>ACTIVE</code> and then queued to the
367:             * target content handler.
368:             * If the invoked content handler is not running, it must be started
369:             * as described in <a href="#execution">Invocation Processing</a>.
370:             *
371:             * <p>
372:             * The calling thread blocks while the content handler is being determined.
373:             * If a network access is needed there may be an associated delay.
374:             *
375:             * @param previous a previous Invocation for this Invocation;
376:             *  may be <code>null</code>
377:             * @param handler the ContentHandlerImpl that is the target
378:             *
379:             * @return <code>true</code> if the application MUST first
380:             *  voluntarily exit before the content handler can be started;
381:             *  <code>false</code> otherwise
382:             *
383:             * @exception IllegalArgumentException is thrown if:
384:             *  <ul>
385:             *     <li> the <code>classname</code> does not implement the
386:             *          lifecycle required by the Java runtime, or </li>
387:             *     <li> the ID, type, and URL are all <code>null</code>, or </li>
388:             *     <li> the argument array contains any <code>null</code>
389:             *          references</li>
390:             *  </ul>
391:             * @exception IOException is thrown if the URL to be accessed is
392:             *   not available
393:             * @exception ContentHandlerException is thrown with a reason of:
394:             *  <ul>
395:             *      <li><code>TYPE_UNKNOWN</code> if the type
396:             *          is not set and cannot be determined from the URL, or</li>
397:             *      <li><code>NO_REGISTERED_HANDLER</code> if
398:             *          there is no registered content handler for the type or
399:             *          ID</li>
400:             * </ul>
401:             * @exception IllegalStateException is thrown if the status of this
402:             *     Invocation is not <code>INIT</code> or if the status of the previous
403:             *     Invocation, if any, is not <code>ACTIVE</code>
404:             * @exception SecurityException if an invoke operation is not permitted
405:             */
406:            boolean invoke(InvocationImpl previous, ContentHandlerImpl handler)
407:                    throws IllegalArgumentException, IOException,
408:                    ContentHandlerException {
409:                /*
410:                 * Check all of the arguments for validity.
411:                 */
412:                for (int i = 0; i < arguments.length; i++) {
413:                    if (arguments[i] == null) {
414:                        throw new IllegalArgumentException("argument is null");
415:                    }
416:                }
417:
418:                if (previous != null) {
419:                    this .previous = previous;
420:                    this .previousTid = previous.tid;
421:                }
422:
423:                // Fill information about the target content handler.
424:                setStatus(Invocation.INIT);
425:                setID(handler.ID);
426:                suiteId = handler.storageId;
427:                classname = handler.classname;
428:
429:                // Queue this Invocation
430:                InvocationStore.put(this );
431:
432:                // Launch the target application if necessary.
433:                boolean shouldExit = false;
434:
435:                try {
436:                    if (handler.registrationMethod == ContentHandlerImpl.REGISTERED_NATIVE) {
437:                        shouldExit = RegistryStore.launch(handler);
438:                        finish(Invocation.INITIATED);
439:                    } else {
440:                        try {
441:                            AppProxy appl = AppProxy.getCurrent().forApp(
442:                                    suiteId, classname);
443:                            shouldExit = appl.launch(handler.getAppName());
444:                            // Set the status of this Invocation to WAITING
445:                            status = Invocation.WAITING;
446:                        } catch (ClassNotFoundException cnfe) {
447:                            throw new ContentHandlerException(
448:                                    "Invoked handler has been removed",
449:                                    ContentHandlerException.NO_REGISTERED_HANDLER);
450:                        }
451:                    }
452:                } catch (ContentHandlerException che) {
453:                    // remove this invocation from the queue before throwing
454:                    setStatus(DISPOSE);
455:                    throw che;
456:                }
457:
458:                // Set the status of the previous invocation
459:                if (previous != null) {
460:                    previous.setStatus(Invocation.HOLD);
461:                }
462:                return shouldExit;
463:            }
464:
465:            /**
466:             * Execute the User Environment Policy to select the next
467:             * application to run.
468:             * Check for and select the next MIDlet suite to run
469:             * based on the contents of the Invocation queue.
470:             *
471:             * From the most recently queued Invocation that is an Invocation
472:             * in INIT.
473:             * If none, find the most recently queued Invocation that is
474:             * a response.
475:             */
476:            static void invokeNext() {
477:                InvocationImpl invoc = null;
478:                int tid;
479:
480:                // Look for a recently queued Invocation to launch
481:                tid = 0;
482:                while ((invoc = InvocationStore.getByTid(tid, -1)) != null) {
483:                    if (invoc.status == Invocation.INIT) {
484:                        AppProxy.getCurrent().logInfo(
485:                                "invokeNext has request: " + invoc);
486:                        if (invoc.suiteId != MIDletSuite.UNUSED_SUITE_ID
487:                                && invoc.classname != null) {
488:                            try {
489:                                AppProxy appl = AppProxy.getCurrent().forApp(
490:                                        invoc.suiteId, invoc.classname);
491:                                appl.launch("Application");
492:                                return;
493:                            } catch (ClassNotFoundException cnfe) {
494:                                // Ignore
495:                            }
496:                        } else if (invoc.ID != null) {
497:                            // check if it is native handler
498:                            ContentHandlerImpl handler = RegistryStore
499:                                    .getHandler(null, invoc.ID,
500:                                            RegistryStore.SEARCH_EXACT);
501:                            if (handler != null
502:                                    && handler.registrationMethod == ContentHandlerImpl.REGISTERED_NATIVE) {
503:                                try {
504:                                    RegistryStore.launch(handler);
505:                                    invoc.finish(Invocation.INITIATED);
506:                                    continue;
507:                                } catch (ContentHandlerException che) {
508:                                    // Ignore
509:                                }
510:                            }
511:                        }
512:
513:                        // can't process this invocation - remove it
514:                        invoc.setStatus(DISPOSE);
515:                    } else if (invoc.status == Invocation.ERROR) {
516:                        AppProxy.getCurrent().logInfo(
517:                                "invokeNext has response: " + invoc);
518:                        if (invoc.suiteId != MIDletSuite.UNUSED_SUITE_ID
519:                                && invoc.classname != null) {
520:                            try {
521:                                AppProxy appl = AppProxy.getCurrent().forApp(
522:                                        invoc.suiteId, invoc.classname);
523:                                appl.launch("Application");
524:                                return;
525:                            } catch (ClassNotFoundException cnfe) {
526:                                // Ignore
527:                            }
528:                        }
529:
530:                        // can't process this invocation - remove it
531:                        invoc.setStatus(DISPOSE);
532:                    }
533:                    tid = invoc.tid;
534:                }
535:            }
536:
537:            /**
538:             * Finish this Invocation and set the status for the response.
539:             *
540:             * @param status the new status of the Invocation. This MUST be either
541:             *         <code>OK</code> or <code>CANCELLED</code>.
542:             *
543:             * @return <code>true</code> if the MIDlet suite MUST
544:             *   voluntarily exit before the response can be returned to the
545:             *   invoking application
546:             *
547:             * @exception IllegalArgumentException if the new
548:             *   <code>status</code> of the Invocation
549:             *    is not <code>OK</code> or <code>CANCELLED</code>
550:             */
551:            boolean finish(int status) {
552:                if (status != Invocation.OK && status != Invocation.CANCELLED
553:                        && status != Invocation.INITIATED) {
554:                    throw new IllegalArgumentException();
555:                }
556:
557:                /*
558:                 * If a response is required by the invoking application,
559:                 * the native code requeues it.
560:                 * The application mutable parameters are saved to the
561:                 * native invocation.
562:                 */
563:                if (getResponseRequired()) {
564:                    if (tid != 0) {
565:                        InvocationStore.setParams(this );
566:                    }
567:                }
568:
569:                setStatus(status);
570:
571:                if (getResponseRequired()) {
572:                    // Launch the target application if necessary.
573:                    try {
574:                        AppProxy appl = AppProxy.getCurrent().forApp(suiteId,
575:                                classname);
576:                        return appl.launch(invokingAppName);
577:                    } catch (ClassNotFoundException cnfe) {
578:                        AppProxy.getCurrent().logInfo(
579:                                "Unable to launch invoking application "
580:                                        + invokingAppName + "; classname = "
581:                                        + classname + " from suite = "
582:                                        + suiteId);
583:                    }
584:                }
585:                return false;
586:            }
587:
588:            /**
589:             * Creates and opens a Connection to the content accessable by
590:             * using the URL. This method is
591:             * equivalent to
592:             * {@link javax.microedition.io.Connector#open Connector.open}
593:             * with the URL provided.
594:             * The application should use this method to access the
595:             * content of the URL
596:             * so that any type or content information cached by the
597:             * implementation can be fully utilized. The content is opened
598:             * in read only mode.
599:             *
600:             * @param timeouts         a flag to indicate that the caller
601:             *                         wants timeout exceptions
602:             * @return                 a Connection object
603:             *
604:             * @exception ConnectionNotFoundException is thrown if:
605:             *   <ul>
606:             *      <li>there is no URL, or</li>
607:             *      <li>the target URL cannot be found, or</li>
608:             *      <li>the requested protocol type is not supported</li>
609:             *   </ul>
610:             * @exception IOException  if some other kind of I/O error occurs
611:             * @exception SecurityException  may be thrown if access to the
612:             *   protocol handler is prohibited
613:             */
614:            public Connection open(boolean timeouts) throws IOException {
615:                Connection conn = Connector.open(getURL(), Connector.READ,
616:                        timeouts);
617:                return conn;
618:            }
619:
620:            /**
621:             * Provide the credentials needed to access the content.
622:             * @param username the username; may be <code>null</code>
623:             * @param password the password for the username;
624:             *   may be <code>null</code>
625:             */
626:            public void setCredentials(String username, char[] password) {
627:                this .username = username;
628:                this .password = (password == null) ? null
629:                        : new String(password);
630:
631:            }
632:
633:            /**
634:             * Returns the status of this Invocation, which can be
635:             * <code>INIT</code>, <code>WAITING</code>, <code>HOLD</code>,
636:             * <code>ACTIVE</code>, <code>OK</code>,
637:             * <code>CANCELLED</code>, or <code>ERROR</code>.
638:             * The application uses the status to determine how
639:             * to process an Invocation returned from
640:             * <code>getInvocation</code>.
641:             *
642:             * @see javax.microedition.content.Registry#invoke
643:             *
644:             * @return the current status of this Invocation
645:             */
646:            public int getStatus() {
647:                return status;
648:            }
649:
650:            /**
651:             * Set the status of this InvocationImpl.
652:             * If the invocation is still active in the native code
653:             * set the status in native also.
654:             * @param status the new status
655:             */
656:            void setStatus(int status) {
657:                this .status = status;
658:                if (tid != 0) {
659:                    InvocationStore.setStatus(this );
660:                }
661:            }
662:
663:            /**
664:             * Finds the type of the content in this Invocation.
665:             * If the <tt>getType</tt> method return value is
666:             * <code>non-null</code>, then the type is returned.
667:             * <p>
668:             * If the type is <code>null</code> and the URL is non-<code>null</code>,
669:             * then the content type will be found by accessing the content
670:             * through the URL.
671:             * When found, the type is set as if the <code>setType</code> method
672:             * was called;  subsequent calls to
673:             * {@link #getType getType} and {@link #findType findType}
674:             * will return the type.
675:             * If an exception is thrown, the <code>getType</code> method will
676:             * return <code>null</code>.
677:             * <p>
678:             * The calling thread blocks while the type is being determined.
679:             * If a network access is needed there may be an associated delay.
680:             *
681:             * @return the <code>non-null</code> content type
682:             * @exception IOException if access to the content fails
683:             *
684:             * @exception ContentHandlerException is thrown with a reason of
685:             * {@link ContentHandlerException#TYPE_UNKNOWN}
686:             *  if the type is <code>null</code> and cannot be found from the
687:             *  content either because the URL is <code>null</code> or the type is
688:             *  not available from the content
689:             * @exception IllegalArgumentException if the content is accessed via
690:             *  the URL and the URL is invalid
691:             * @exception SecurityException is thrown if access to the content
692:             *  is required and is not permitted
693:             */
694:            public String findType() throws IOException,
695:                    ContentHandlerException {
696:                if (type != null) {
697:                    return type;
698:                }
699:                if (url == null) {
700:                    // No URL to examine, leave the type null
701:                    throw new ContentHandlerException("URL is null",
702:                            ContentHandlerException.TYPE_UNKNOWN);
703:                }
704:
705:                // Open a connection to the content.
706:                Connection conn = null;
707:                int rc = 0;
708:                try {
709:                    while (true) {
710:                        // Loop to enable redirects.
711:                        conn = Connector.open(url);
712:                        if (conn instanceof  HttpConnection) {
713:                            HttpConnection httpc = (HttpConnection) conn;
714:                            httpc.setRequestMethod(httpc.HEAD);
715:
716:                            // Get the response code
717:                            rc = httpc.getResponseCode();
718:                            if (rc == HttpConnection.HTTP_OK) {
719:                                type = httpc.getType();
720:                                if (type != null) {
721:                                    // Check for and remove any parameters (rfc2616)
722:                                    int ndx = type.indexOf(';');
723:                                    if (ndx >= 0) {
724:                                        type = type.substring(0, ndx);
725:                                    }
726:                                    type = type.trim();
727:                                }
728:                                if (type == null || type.length() == 0) {
729:                                    type = null;
730:                                    throw new ContentHandlerException(
731:                                            "unable to determine type",
732:                                            ContentHandlerException.TYPE_UNKNOWN);
733:                                }
734:                                break;
735:                            } else if (rc == HttpConnection.HTTP_TEMP_REDIRECT
736:                                    || rc == HttpConnection.HTTP_MOVED_TEMP
737:                                    || rc == HttpConnection.HTTP_MOVED_PERM) {
738:                                // Get the new location and close the connection
739:                                url = httpc.getHeaderField("location");
740:
741:                                conn.close();
742:                                conn = null;
743:                                continue; // restart with the new url
744:                            } else {
745:                                throw new IOException("http status: " + rc);
746:                            }
747:                        } else {
748:                            // Not HTTP, this isn't going to work
749:                            // TBD: Check suffixes
750:                            throw new ContentHandlerException(
751:                                    "URL scheme not supported",
752:                                    ContentHandlerException.TYPE_UNKNOWN);
753:                        }
754:                    }
755:
756:                } finally {
757:                    if (conn != null) {
758:                        try {
759:                            conn.close();
760:                        } catch (Exception ex) {
761:                        }
762:                    }
763:                }
764:                return type;
765:            }
766:
767:            /**
768:             * Returns the previous Invocation linked to this
769:             * Invocation by this application's previous call to
770:             * {@link Registry#invoke(Invocation invoc, Invocation previous)}.
771:             *
772:             * @return the previous Invocation, if any, set when this
773:             *        Invocation was invoked;
774:             *        <code>null</code> is returned if the Invocation was not
775:             *  invoked with a previous Invocation.
776:             */
777:            public InvocationImpl getPrevious() {
778:                return previous;
779:            }
780:
781:            /**
782:             * Gets the authority, if any, used to authenticate the
783:             * application that invoked this request.
784:             * This value MUST be <code>null</code> unless the device has been
785:             * able to authenticate this application.
786:             * If <code>non-null</code>, it is the string identifiying the
787:             * authority.  For example,
788:             * if the application was a signed MIDlet, then this is the
789:             * "subject" of the certificate used to sign the application.
790:             *
791:             * <p>The format of the authority for X.509 certificates is defined
792:             * by the MIDP Printable Representation of X.509 Distinguished
793:             * Names as defined in class
794:             *
795:             * <code>javax.microedition.pki.Certificate</code>. </p>
796:             * @return the authority used to authenticate this application
797:             * or <code>null</code> otherwise
798:             *
799:             * @exception IllegalStateException if the current status is not
800:             * <code>ACTIVE</code> or <code>HOLD</code>
801:             *
802:             * @see ContentHandler#getAuthority
803:             */
804:            public String getInvokingAuthority() {
805:                if (status != Invocation.ACTIVE && status != Invocation.HOLD) {
806:                    return null;
807:                }
808:                return invokingAuthority;
809:            }
810:
811:            /**
812:             * Get the user-friendly name of the application that invoked
813:             * the content handler. This information is available only if the status is
814:             * <code>ACTIVE</code> or <code>HOLD</code>.
815:             *
816:             * This information has been authenticated only if
817:             * <code>getInvokingAuthority</code> is non-null.
818:             *
819:             * @return the application's name if status is <code>ACTIVE</code>
820:             * or <code>HOLD</code>; <code>null</code> otherwise
821:             *
822:             * @see ContentHandler#getID
823:             */
824:            public String getInvokingAppName() {
825:                if (status != Invocation.ACTIVE && status != Invocation.HOLD) {
826:                    return null;
827:                }
828:                return invokingAppName;
829:            }
830:
831:            /**
832:             * Gets the ID of the application that invoked the content
833:             * handler. This information is available only if the status is
834:             * <code>ACTIVE</code> or <code>HOLD</code>.
835:             *
836:             * This information has been authenticated only if
837:             * <code>getInvokingAuthority</code> is non-null.
838:             *
839:             * @return the application's ID if status is <code>ACTIVE</code>
840:             * or <code>HOLD</code>; <code>null</code> otherwise
841:             *
842:             * @exception IllegalStateException if the current status is not
843:             * <code>ACTIVE</code> or <code>HOLD</code>
844:             *
845:             * @see ContentHandler#getID
846:             */
847:            public String getInvokingID() {
848:                if (status != Invocation.ACTIVE && status != Invocation.HOLD) {
849:                    return null;
850:                }
851:                return invokingID;
852:            }
853:
854:            /**
855:             * Return a printable form of InvocationImpl.
856:             * Disabled if not logging
857:             * @return a String containing a printable form
858:             */
859:            public String toString() {
860:                if (AppProxy.LOG_INFO) {
861:                    StringBuffer sb = new StringBuffer(200);
862:                    sb.append("tid: ");
863:                    sb.append(tid);
864:                    sb.append(" status: ");
865:                    sb.append(status);
866:                    //        sb.append("  suiteId: ");   sb.append(suiteId);
867:                    sb.append(", type: ");
868:                    sb.append(getType());
869:                    sb.append(", url: ");
870:                    sb.append(getURL());
871:                    sb.append(", respReq: ");
872:                    sb.append(getResponseRequired());
873:                    //        sb.append(", args: ");      sb.append(getArgs());
874:                    //        sb.append(", prevTid: ");   sb.append(previousTid);
875:                    //        sb.append(", previous: ");
876:                    //        sb.append((previous == null) ? "null" : "non-null");
877:                    //        sb.append("_suiteId: ");    sb.append(invokingSuiteId);
878:                    sb.append("\n   invokee: ");
879:                    sb.append(classname);
880:                    sb.append(", invoker: ");
881:                    sb.append(invokingClassname);
882:                    //        sb.append(", _authority: "); sb.append(invokingAuthority);
883:                    //        sb.append(", _ID: ");       sb.append(invokingID);
884:                    return sb.toString();
885:                } else {
886:                    return super.toString();
887:                }
888:            }
889:        }
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