001: package com.jgraph.browserplugin;
002:
003: import java.io.File;
004: import java.io.IOException;
005: import java.lang.reflect.Constructor;
006: import java.lang.reflect.Field;
007: import java.lang.reflect.InvocationTargetException;
008: import java.lang.reflect.Method;
009: import java.net.URL;
010:
011: /**
012: * BrowserLauncher is a class that provides one static method, openURL, which
013: * opens the default web browser for the current user of the system to the given
014: * URL. It may support other protocols depending on the system -- mailto, ftp,
015: * etc. -- but that has not been rigorously tested and is not guaranteed to
016: * work.
017: * <p>
018: * Yes, this is platform-specific code, and yes, it may rely on classes on
019: * certain platforms that are not part of the standard JDK. What we're trying to
020: * do, though, is to take something that's frequently desirable but inherently
021: * platform-specific -- opening a default browser -- and allow programmers (you,
022: * for example) to do so without worrying about dropping into native code or
023: * doing anything else similarly evil.
024: * <p>
025: * Anyway, this code is completely in Java and will run on all JDK 1.1-compliant
026: * systems without modification or a need for additional libraries. All classes
027: * that are required on certain platforms to allow this to run are dynamically
028: * loaded at runtime via reflection and, if not found, will not cause this to do
029: * anything other than returning an error when opening the browser.
030: * <p>
031: * There are certain system requirements for this class, as it's running through
032: * Runtime.exec(), which is Java's way of making a native system call.
033: * Currently, this requires that a Macintosh have a Finder which supports the
034: * GURL event, which is true for Mac OS 8.0 and 8.1 systems that have the
035: * Internet Scripting AppleScript dictionary installed in the Scripting
036: * Additions folder in the Extensions folder (which is installed by default as
037: * far as I know under Mac OS 8.0 and 8.1), and for all Mac OS 8.5 and later
038: * systems. On Windows, it only runs under Win32 systems (Windows 95, 98, and NT
039: * 4.0, as well as later versions of all). On other systems, this drops back
040: * from the inherently platform-sensitive concept of a default browser and
041: * simply attempts to launch Netscape via a shell command.
042: * <p>
043: * This code is Copyright 1999-2001 by Eric Albert (ejalbert@cs.stanford.edu)
044: * and may be redistributed or modified in any form without restrictions as long
045: * as the portion of this comment from this paragraph through the end of the
046: * comment is not removed. The author requests that he be notified of any
047: * application, applet, or other binary that makes use of this code, but that's
048: * more out of curiosity than anything and is not required. This software
049: * includes no warranty. The author is not repsonsible for any loss of data or
050: * functionality or any adverse or unexpected effects of using this software.
051: * <p>
052: * Credits: <br>
053: * Steven Spencer, JavaWorld magazine (<a
054: * href="http://www.javaworld.com/javaworld/javatips/jw-javatip66.html">Java Tip
055: * 66</a>) <br>
056: * Thanks also to Ron B. Yeh, Eric Shapiro, Ben Engber, Paul Teitlebaum, Andrea
057: * Cantatore, Larry Barowski, Trevor Bedzek, Frank Miedrich, and Ron Rabakukk
058: *
059: * Latest version can be found at: <a
060: * href="http://sourceforge.net/projects/browserlauncher/">SourceForge</a>.
061: *
062: * @author Eric Albert (<a
063: * href="mailto:ejalbert@cs.stanford.edu">ejalbert@cs.stanford.edu</a>)
064: * @version 1.4b1 (Released June 20, 2001)
065: *
066: *
067: */
068:
069: public class JGraphpadBrowserLauncher {
070:
071: /**
072: * The Java virtual machine that we are running on. Actually, in most cases
073: * we only care about the operating system, but some operating systems
074: * require us to switch on the VM.
075: */
076: private static int jvm;
077:
078: /** The browser for the system */
079: private static Object browser;
080:
081: /**
082: * Caches whether any classes, methods, and fields that are not part of the
083: * JDK and need to be dynamically loaded at runtime loaded successfully.
084: * <p>
085: * Note that if this is <code>false</code>, <code>openURL()</code> will
086: * always return an IOException.
087: */
088: private static boolean loadedWithoutErrors;
089:
090: /** The com.apple.mrj.MRJFileUtils class */
091: private static Class mrjFileUtilsClass;
092:
093: /** The com.apple.mrj.MRJOSType class */
094: private static Class mrjOSTypeClass;
095:
096: /** The com.apple.MacOS.AEDesc class */
097: private static Class aeDescClass;
098:
099: /** The <init>(int) method of com.apple.MacOS.AETarget */
100: private static Constructor aeTargetConstructor;
101:
102: /** The <init>(int, int, int) method of com.apple.MacOS.AppleEvent */
103: private static Constructor appleEventConstructor;
104:
105: /** The <init>(String) method of com.apple.MacOS.AEDesc */
106: private static Constructor aeDescConstructor;
107:
108: /** The findFolder method of com.apple.mrj.MRJFileUtils */
109: private static Method findFolder;
110:
111: /** The getFileCreator method of com.apple.mrj.MRJFileUtils */
112: private static Method getFileCreator;
113:
114: /** The getFileType method of com.apple.mrj.MRJFileUtils */
115: private static Method getFileType;
116:
117: /** The openURL method of com.apple.mrj.MRJFileUtils */
118: private static Method openURL;
119:
120: /** The makeOSType method of com.apple.MacOS.OSUtils */
121: private static Method makeOSType;
122:
123: /** The putParameter method of com.apple.MacOS.AppleEvent */
124: private static Method putParameter;
125:
126: /** The sendNoReply method of com.apple.MacOS.AppleEvent */
127: private static Method sendNoReply;
128:
129: /** Actually an MRJOSType pointing to the System Folder on a Macintosh */
130: private static Object kSystemFolderType;
131:
132: /** The keyDirectObject AppleEvent parameter type */
133: private static Integer keyDirectObject;
134:
135: /** The kAutoGenerateReturnID AppleEvent code */
136: private static Integer kAutoGenerateReturnID;
137:
138: /** The kAnyTransactionID AppleEvent code */
139: private static Integer kAnyTransactionID;
140:
141: /** The linkage object required for JDirect 3 on Mac OS X. */
142: private static Object linkage;
143:
144: /** The framework to reference on Mac OS X */
145: // private static final String JDirect_MacOSX =
146: // "/System/Library/Frameworks/Carbon.framework/Frameworks/HIToolbox.framework/HIToolbox";
147: /** JVM constant for MRJ 2.0 */
148: private static final int MRJ_2_0 = 0;
149:
150: /** JVM constant for MRJ 2.1 or later */
151: private static final int MRJ_2_1 = 1;
152:
153: /** JVM constant for Java on Mac OS X 10.0 (MRJ 3.0) */
154: private static final int MRJ_3_0 = 3;
155:
156: /** JVM constant for MRJ 3.1 */
157: private static final int MRJ_3_1 = 4;
158:
159: /** JVM constant for any Windows NT JVM */
160: private static final int WINDOWS_NT = 5;
161:
162: /** JVM constant for any Windows 9x JVM */
163: private static final int WINDOWS_9x = 6;
164:
165: /** JVM constant for any other platform */
166: private static final int OTHER = -1;
167:
168: /**
169: * The file type of the Finder on a Macintosh. Hardcoding "Finder" would
170: * keep non-U.S. English systems from working properly.
171: */
172: private static final String FINDER_TYPE = "FNDR";
173:
174: /**
175: * The creator code of the Finder on a Macintosh, which is needed to send
176: * AppleEvents to the application.
177: */
178: private static final String FINDER_CREATOR = "MACS";
179:
180: /** The name for the AppleEvent type corresponding to a GetURL event. */
181: private static final String GURL_EVENT = "GURL";
182:
183: /**
184: * The first parameter that needs to be passed into Runtime.exec() to open
185: * the default web browser on Windows.
186: */
187: // private static final String FIRST_WINDOWS_PARAMETER = "/c";
188: /** The second parameter for Runtime.exec() on Windows. */
189: // private static final String SECOND_WINDOWS_PARAMETER = "start";
190: /**
191: * The third parameter for Runtime.exec() on Windows. This is a "title"
192: * parameter that the command line expects. Setting this parameter allows
193: * URLs containing spaces to work.
194: */
195: // private static final String THIRD_WINDOWS_PARAMETER = "\"\"";
196: /**
197: * The shell parameters for Netscape that opens a given URL in an
198: * already-open copy of Netscape on many command-line systems.
199: */
200: private static final String NETSCAPE_REMOTE_PARAMETER = "-remote";
201:
202: private static final String NETSCAPE_OPEN_PARAMETER_START = "'openURL(";
203:
204: private static final String NETSCAPE_OPEN_PARAMETER_END = ")'";
205:
206: /**
207: * The message from any exception thrown throughout the initialization
208: * process.
209: */
210: private static String errorMessage;
211:
212: /**
213: * An initialization block that determines the operating system and loads
214: * the necessary runtime data.
215: */
216: static {
217: loadedWithoutErrors = true;
218: String osName = System.getProperty("os.name");
219: if (osName.startsWith("Mac OS")) {
220: String mrjVersion = System.getProperty("mrj.version");
221: String majorMRJVersion = mrjVersion.substring(0, 3);
222: try {
223: double version = Double.valueOf(majorMRJVersion)
224: .doubleValue();
225: if (version == 2) {
226: jvm = MRJ_2_0;
227: } else if (version >= 2.1 && version < 3) {
228: // Assume that all 2.x versions of MRJ work the same. MRJ
229: // 2.1 actually
230: // works via Runtime.exec() and 2.2 supports that but has an
231: // openURL() method
232: // as well that we currently ignore.
233: jvm = MRJ_2_1;
234: } else if (version == 3.0) {
235: jvm = MRJ_3_0;
236: } else if (version >= 3.1) {
237: // Assume that all 3.1 and later versions of MRJ work the
238: // same.
239: jvm = MRJ_3_1;
240: } else {
241: loadedWithoutErrors = false;
242: errorMessage = "Unsupported MRJ version: "
243: + version;
244: }
245: } catch (NumberFormatException nfe) {
246: loadedWithoutErrors = false;
247: errorMessage = "Invalid MRJ version: " + mrjVersion;
248: }
249: } else if (osName.startsWith("Windows")) {
250: if (osName.indexOf("9") != -1) {
251: jvm = WINDOWS_9x;
252: } else {
253: jvm = WINDOWS_NT;
254: }
255: } else {
256: jvm = OTHER;
257: }
258:
259: if (loadedWithoutErrors) { // if we haven't hit any errors yet
260: loadedWithoutErrors = loadClasses();
261: }
262: }
263:
264: /**
265: * This class should be never be instantiated; this just ensures so.
266: */
267: private JGraphpadBrowserLauncher() {
268: }
269:
270: /**
271: * Called by a static initializer to load any classes, fields, and methods
272: * required at runtime to locate the user's web browser.
273: *
274: * @return <code>true</code> if all intialization succeeded
275: * <code>false</code> if any portion of the initialization failed
276: */
277: private static boolean loadClasses() {
278: switch (jvm) {
279: case MRJ_2_0:
280: try {
281: Class aeTargetClass = Class
282: .forName("com.apple.MacOS.AETarget");
283: Class osUtilsClass = Class
284: .forName("com.apple.MacOS.OSUtils");
285: Class appleEventClass = Class
286: .forName("com.apple.MacOS.AppleEvent");
287: Class aeClass = Class.forName("com.apple.MacOS.ae");
288: aeDescClass = Class.forName("com.apple.MacOS.AEDesc");
289:
290: aeTargetConstructor = aeTargetClass
291: .getDeclaredConstructor(new Class[] { int.class });
292: appleEventConstructor = appleEventClass
293: .getDeclaredConstructor(new Class[] {
294: int.class, int.class, aeTargetClass,
295: int.class, int.class });
296: aeDescConstructor = aeDescClass
297: .getDeclaredConstructor(new Class[] { String.class });
298:
299: makeOSType = osUtilsClass.getDeclaredMethod(
300: "makeOSType", new Class[] { String.class });
301: putParameter = appleEventClass.getDeclaredMethod(
302: "putParameter", new Class[] { int.class,
303: aeDescClass });
304: sendNoReply = appleEventClass.getDeclaredMethod(
305: "sendNoReply", new Class[] {});
306:
307: Field keyDirectObjectField = aeClass
308: .getDeclaredField("keyDirectObject");
309: keyDirectObject = (Integer) keyDirectObjectField
310: .get(null);
311: Field autoGenerateReturnIDField = appleEventClass
312: .getDeclaredField("kAutoGenerateReturnID");
313: kAutoGenerateReturnID = (Integer) autoGenerateReturnIDField
314: .get(null);
315: Field anyTransactionIDField = appleEventClass
316: .getDeclaredField("kAnyTransactionID");
317: kAnyTransactionID = (Integer) anyTransactionIDField
318: .get(null);
319: } catch (ClassNotFoundException cnfe) {
320: errorMessage = cnfe.getMessage();
321: return false;
322: } catch (NoSuchMethodException nsme) {
323: errorMessage = nsme.getMessage();
324: return false;
325: } catch (NoSuchFieldException nsfe) {
326: errorMessage = nsfe.getMessage();
327: return false;
328: } catch (IllegalAccessException iae) {
329: errorMessage = iae.getMessage();
330: return false;
331: }
332: break;
333: case MRJ_2_1:
334: try {
335: mrjFileUtilsClass = Class
336: .forName("com.apple.mrj.MRJFileUtils");
337: mrjOSTypeClass = Class
338: .forName("com.apple.mrj.MRJOSType");
339: Field systemFolderField = mrjFileUtilsClass
340: .getDeclaredField("kSystemFolderType");
341: kSystemFolderType = systemFolderField.get(null);
342: findFolder = mrjFileUtilsClass.getDeclaredMethod(
343: "findFolder", new Class[] { mrjOSTypeClass });
344: getFileCreator = mrjFileUtilsClass.getDeclaredMethod(
345: "getFileCreator", new Class[] { File.class });
346: getFileType = mrjFileUtilsClass.getDeclaredMethod(
347: "getFileType", new Class[] { File.class });
348: } catch (ClassNotFoundException cnfe) {
349: errorMessage = cnfe.getMessage();
350: return false;
351: } catch (NoSuchFieldException nsfe) {
352: errorMessage = nsfe.getMessage();
353: return false;
354: } catch (NoSuchMethodException nsme) {
355: errorMessage = nsme.getMessage();
356: return false;
357: } catch (SecurityException se) {
358: errorMessage = se.getMessage();
359: return false;
360: } catch (IllegalAccessException iae) {
361: errorMessage = iae.getMessage();
362: return false;
363: }
364: break;
365: case MRJ_3_0:
366: try {
367: Class linker = Class
368: .forName("com.apple.mrj.jdirect.Linker");
369: Constructor constructor = linker
370: .getConstructor(new Class[] { Class.class });
371: linkage = constructor
372: .newInstance(new Object[] { JGraphpadBrowserLauncher.class });
373: } catch (ClassNotFoundException cnfe) {
374: errorMessage = cnfe.getMessage();
375: return false;
376: } catch (NoSuchMethodException nsme) {
377: errorMessage = nsme.getMessage();
378: return false;
379: } catch (InvocationTargetException ite) {
380: errorMessage = ite.getMessage();
381: return false;
382: } catch (InstantiationException ie) {
383: errorMessage = ie.getMessage();
384: return false;
385: } catch (IllegalAccessException iae) {
386: errorMessage = iae.getMessage();
387: return false;
388: }
389: break;
390: case MRJ_3_1:
391: try {
392: mrjFileUtilsClass = Class
393: .forName("com.apple.mrj.MRJFileUtils");
394: openURL = mrjFileUtilsClass.getDeclaredMethod(
395: "openURL", new Class[] { String.class });
396: } catch (ClassNotFoundException cnfe) {
397: errorMessage = cnfe.getMessage();
398: return false;
399: } catch (NoSuchMethodException nsme) {
400: errorMessage = nsme.getMessage();
401: return false;
402: }
403: break;
404: default:
405: break;
406: }
407: return true;
408: }
409:
410: /**
411: * Attempts to locate the default web browser on the local system. Caches
412: * results so it only locates the browser once for each use of this class
413: * per JVM instance.
414: *
415: * @return The browser for the system. Note that this may not be what you
416: * would consider to be a standard web browser; instead, it's the
417: * application that gets called to open the default web browser. In
418: * some cases, this will be a non-String object that provides the
419: * means of calling the default browser.
420: */
421: private static Object locateBrowser() {
422: if (browser != null) {
423: return browser;
424: }
425: switch (jvm) {
426: case MRJ_2_0:
427: try {
428: Integer finderCreatorCode = (Integer) makeOSType
429: .invoke(null, new Object[] { FINDER_CREATOR });
430: Object aeTarget = aeTargetConstructor
431: .newInstance(new Object[] { finderCreatorCode });
432: Integer gurlType = (Integer) makeOSType.invoke(null,
433: new Object[] { GURL_EVENT });
434: Object appleEvent = appleEventConstructor
435: .newInstance(new Object[] { gurlType, gurlType,
436: aeTarget, kAutoGenerateReturnID,
437: kAnyTransactionID });
438: // Don't set browser = appleEvent because then the next time we
439: // call
440: // locateBrowser(), we'll get the same AppleEvent, to which
441: // we'll already have
442: // added the relevant parameter. Instead, regenerate the
443: // AppleEvent every time.
444: // There's probably a way to do this better; if any has any
445: // ideas, please let
446: // me know.
447: return appleEvent;
448: } catch (IllegalAccessException iae) {
449: browser = null;
450: errorMessage = iae.getMessage();
451: return browser;
452: } catch (InstantiationException ie) {
453: browser = null;
454: errorMessage = ie.getMessage();
455: return browser;
456: } catch (InvocationTargetException ite) {
457: browser = null;
458: errorMessage = ite.getMessage();
459: return browser;
460: }
461: case MRJ_2_1:
462: File systemFolder;
463: try {
464: systemFolder = (File) findFolder.invoke(null,
465: new Object[] { kSystemFolderType });
466: } catch (IllegalArgumentException iare) {
467: browser = null;
468: errorMessage = iare.getMessage();
469: return browser;
470: } catch (IllegalAccessException iae) {
471: browser = null;
472: errorMessage = iae.getMessage();
473: return browser;
474: } catch (InvocationTargetException ite) {
475: browser = null;
476: errorMessage = ite.getTargetException().getClass()
477: + ": " + ite.getTargetException().getMessage();
478: return browser;
479: }
480: String[] systemFolderFiles = systemFolder.list();
481: // Avoid a FilenameFilter because that can't be stopped mid-list
482: for (int i = 0; i < systemFolderFiles.length; i++) {
483: try {
484: File file = new File(systemFolder,
485: systemFolderFiles[i]);
486: if (!file.isFile()) {
487: continue;
488: }
489: // We're looking for a file with a creator code of 'MACS'
490: // and
491: // a type of 'FNDR'. Only requiring the type results in
492: // non-Finder
493: // applications being picked up on certain Mac OS 9 systems,
494: // especially German ones, and sending a GURL event to those
495: // applications results in a logout under Multiple Users.
496: Object fileType = getFileType.invoke(null,
497: new Object[] { file });
498: if (FINDER_TYPE.equals(fileType.toString())) {
499: Object fileCreator = getFileCreator.invoke(
500: null, new Object[] { file });
501: if (FINDER_CREATOR.equals(fileCreator
502: .toString())) {
503: browser = file.toString(); // Actually the Finder,
504: // but that's OK
505: return browser;
506: }
507: }
508: } catch (IllegalArgumentException iare) {
509: errorMessage = iare.getMessage();
510: return null;
511: } catch (IllegalAccessException iae) {
512: browser = null;
513: errorMessage = iae.getMessage();
514: return browser;
515: } catch (InvocationTargetException ite) {
516: browser = null;
517: errorMessage = ite.getTargetException().getClass()
518: + ": "
519: + ite.getTargetException().getMessage();
520: return browser;
521: }
522: }
523: browser = null;
524: break;
525: case MRJ_3_0:
526: case MRJ_3_1:
527: browser = ""; // Return something non-null
528: break;
529: case WINDOWS_NT:
530: browser = "cmd.exe";
531: break;
532: case WINDOWS_9x:
533: browser = "command.com";
534: break;
535: case OTHER:
536: default:
537: browser = "netscape";
538: try {
539: if (new File("/usr/bin/mozilla").exists())
540: browser = "/usr/bin/mozilla";
541: } catch (Exception e) {
542: // ignore
543: }
544: try {
545: if (new File("/usr/bin/firefox").exists())
546: browser = "/usr/bin/firefox";
547: } catch (Exception e) {
548: // ignore
549: }
550: break;
551: }
552: return browser;
553: }
554:
555: public static void openURL(URL url) throws IOException {
556: openURL(url.toExternalForm());
557: }
558:
559: /**
560: * Attempts to open the default web browser to the given URL.
561: *
562: * @param url
563: * The URL to open
564: * @throws IOException
565: * If the web browser could not be located or does not run
566: */
567: public static void openURL(String url) throws IOException {
568: if (!loadedWithoutErrors) {
569: throw new IOException("Exception in finding browser: "
570: + errorMessage);
571: }
572: Object browser = locateBrowser();
573: if (browser == null) {
574: throw new IOException("Unable to locate browser: "
575: + errorMessage);
576: }
577:
578: switch (jvm) {
579: case MRJ_2_0:
580: Object aeDesc = null;
581: try {
582: aeDesc = aeDescConstructor
583: .newInstance(new Object[] { url });
584: putParameter.invoke(browser, new Object[] {
585: keyDirectObject, aeDesc });
586: sendNoReply.invoke(browser, new Object[] {});
587: } catch (InvocationTargetException ite) {
588: throw new IOException(
589: "InvocationTargetException while creating AEDesc: "
590: + ite.getMessage());
591: } catch (IllegalAccessException iae) {
592: throw new IOException(
593: "IllegalAccessException while building AppleEvent: "
594: + iae.getMessage());
595: } catch (InstantiationException ie) {
596: throw new IOException(
597: "InstantiationException while creating AEDesc: "
598: + ie.getMessage());
599: } finally {
600: aeDesc = null; // Encourage it to get disposed if it was
601: // created
602: browser = null; // Ditto
603: }
604: break;
605: case MRJ_2_1:
606: Runtime.getRuntime().exec(
607: new String[] { (String) browser, url });
608: break;
609: case MRJ_3_0:
610: int[] instance = new int[1];
611: int result = ICStart(instance, 0);
612: if (result == 0) {
613: int[] selectionStart = new int[] { 0 };
614: byte[] urlBytes = url.getBytes();
615: int[] selectionEnd = new int[] { urlBytes.length };
616: result = ICLaunchURL(instance[0], new byte[] { 0 },
617: urlBytes, urlBytes.length, selectionStart,
618: selectionEnd);
619: if (result == 0) {
620: // Ignore the return value; the URL was launched
621: // successfully
622: // regardless of what happens here.
623: ICStop(instance);
624: } else {
625:
626: throw new IOException("Unable to launch URL: "
627: + result);
628: }
629: } else {
630: throw new IOException(
631: "Unable to create an Internet Config instance: "
632: + result);
633: }
634: break;
635: case MRJ_3_1:
636: try {
637: openURL.invoke(null, new Object[] { url });
638: } catch (InvocationTargetException ite) {
639: throw new IOException(
640: "InvocationTargetException while calling openURL: "
641: + ite.getMessage());
642: } catch (IllegalAccessException iae) {
643: throw new IOException(
644: "IllegalAccessException while calling openURL: "
645: + iae.getMessage());
646: }
647: break;
648: case WINDOWS_NT:
649: case WINDOWS_9x:
650: // Add quotes around the URL to allow ampersands and other special
651: // characters to work.
652: // Process process = Runtime.getRuntime().exec(new String[] {
653: // (String) browser,
654: // FIRST_WINDOWS_PARAMETER,
655: // SECOND_WINDOWS_PARAMETER,
656: // THIRD_WINDOWS_PARAMETER,
657: // '"' + url + '"' });
658:
659: // VW opens browser without first displaying the distracting command
660: // window
661: // TODO: test quotes, for some reason I recall it does not work in
662: // this case
663: Process process = Runtime.getRuntime().exec(
664: "rundll32 url.dll,FileProtocolHandler " + url);
665:
666: // This avoids a memory leak on some versions of Java on Windows.
667: // That's hinted at in
668: // <http://developer.java.sun.com/developer/qow/archive/68/>.
669: try {
670: process.waitFor();
671: process.exitValue();
672: } catch (InterruptedException ie) {
673: throw new IOException(
674: "InterruptedException while launching browser: "
675: + ie.getMessage());
676: }
677: break;
678: case OTHER:
679: // Assume that we're on Unix and that Netscape is installed
680:
681: // First, attempt to open the URL in a currently running session of
682: // Netscape
683: process = Runtime.getRuntime().exec(
684: new String[] {
685: (String) browser,
686: NETSCAPE_REMOTE_PARAMETER,
687: NETSCAPE_OPEN_PARAMETER_START + url
688: + NETSCAPE_OPEN_PARAMETER_END });
689: try {
690: int exitCode = process.waitFor();
691: if (exitCode != 0) { // if Netscape was not open
692: Runtime.getRuntime().exec(
693: new String[] { (String) browser, url });
694: }
695: } catch (InterruptedException ie) {
696: throw new IOException(
697: "InterruptedException while launching browser: "
698: + ie.getMessage());
699: }
700: break;
701: default:
702: // This should never occur, but if it does, we'll try the simplest
703: // thing possible
704: Runtime.getRuntime().exec(
705: new String[] { (String) browser, url });
706: break;
707: }
708: }
709:
710: /**
711: * Methods required for Mac OS X. The presence of native methods does not
712: * cause any problems on other platforms.
713: */
714: private native static int ICStart(int[] instance, int signature);
715:
716: private native static int ICStop(int[] instance);
717:
718: private native static int ICLaunchURL(int instance, byte[] hint,
719: byte[] data, int len, int[] selectionStart,
720: int[] selectionEnd);
721: }
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