1 // Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
4 import java.lang.reflect.*;
11 * Abstracts away the small irregularities in JVM implementations.
13 * The default Platform class supports a vanilla JDK 1.1
14 * JVM. Subclasses are provided for other VMs. Methods whose names
15 * start with an underscore are meant to be overridden by
16 * subclasses. If you create a subclass of Platform, you should put
17 * it in the org.xwt.plat package, and add code to this file's static
18 * block to detect the new platform.
20 public class Platform {
22 // Static Data /////////////////////////////////////////////////////////////////////////////////////
25 * set to true during the delivery of a KeyPressed:C-v/A-v or Press3; it is safe to use a
26 * 'global' here, since message delivery is single-threaded and non-preemptable
28 static boolean clipboardReadEnabled = false;
30 /** The appropriate Platform object for this JVM */
31 static Platform platform = null;
33 /** true if proxy autodetection has already been run */
34 static boolean alreadyDetectedProxy = false;
36 /** the result of proxy autodetection */
37 static org.xwt.HTTP.Proxy cachedProxyInfo = null;
39 /** the current build */
40 public static String build = "unknown";
42 // VM Detection Logic /////////////////////////////////////////////////////////////////////
44 /** do-nothing method that forces <clinit> to run */
45 public static void forceLoad() { }
47 // If you create a new subclass of Platform, you should add logic
48 // here to detect it. Do not reference your class directly -- use
52 System.err.println("Detecting JVM...");
54 String vendor = System.getProperty("java.vendor", "");
55 String version = System.getProperty("java.version", "");
56 String os_name = System.getProperty("os.name", "");
57 String os_version = System.getProperty("os.version", "");
58 String platform_class = null;
60 if (os_name.startsWith("Darwin")) platform_class = "Darwin";
61 else if (vendor.startsWith("Free Software Foundation")) {
62 if (os_name.startsWith("Window")) platform_class = "Win32";
63 else platform_class = "X11";
64 } else if (version.startsWith("1.1") && vendor.startsWith("Netscape")) platform_class = "Netscape";
65 else if (version.startsWith("1.1") && vendor.startsWith("Microsoft")) platform_class = "Microsoft";
66 else if (!version.startsWith("1.0") && !version.startsWith("1.1")) platform_class = "Java2";
69 // Disable 2d hardware acceleration on Jaguar
70 if (os_name.equals("Mac OS X") && os_version.startsWith("10.2")) System.setProperty("com.apple.hwaccel", "false");
73 if (platform_class != null) {
74 platform = (Platform)Class.forName("org.xwt.plat." + platform_class).newInstance();
79 build = (String)Class.forName("org.xwt.Build").getField("build").get(null);
80 } catch (ClassNotFoundException cnfe) {
81 } catch (Exception e) {
82 if (Log.on) Log.log(Platform.class, "exception while detecting build:");
83 if (Log.on) Log.log(Platform.class, e);
85 if (Log.on) Log.log(Platform.class, "XWT build: " + build);
87 if (Log.on) Log.log(Platform.class, "XWT VM detection: vendor = " + vendor);
88 if (Log.on) Log.log(Platform.class, " version = " + version);
89 if (Log.on) Log.log(Platform.class, " os = " + os_name + " [version " + os_version + "]");
91 if (platform_class == null) {
92 if (Log.on) Log.log(Platform.class, "Unable to detect JVM");
93 new Platform().criticalAbort("Unable to detect JVM");
96 if (Log.on) Log.log(Platform.class, " platform = " + platform.getDescriptiveName());
97 if (Log.on) Log.log(Platform.class, " class = " + platform.getClass().getName());
100 } catch (Exception e) {
101 if (Log.on) Log.log(Platform.class, "Exception while trying to detect JVM");
102 if (Log.on) Log.log(Platform.class, e);
103 new Platform().criticalAbort("Unable to detect JVM");
109 // Methods to be Overridden ////////////////////////////////////////////////////////////////////
111 /** a string describing the VM */
112 protected String getDescriptiveName() { return "Generic Java 1.1 VM"; }
114 /** this initializes the platform; code in here can invoke methods on Platform since Platform.platform has already been set */
115 protected void init() { }
116 protected void postInit() { }
118 /** creates and returns a doublebuffer 'belonging' to <tt>owner</tt>; we need to associate PixelBuffers to surfaces
119 * due to AWT 1.1 requirements (definately for Navigator, possibly also for MSJVM).
121 public static PixelBuffer createPixelBuffer(int w, int h, Surface s) { return platform._createPixelBuffer(w, h, s); }
122 protected PixelBuffer _createPixelBuffer(int w, int h, Surface owner) { return null; }
124 /** creates and returns a picture */
125 public static Picture createPicture(int[] data, int w, int h) { return platform._createPicture(data, w, h); }
126 public static Picture createAlphaOnlyPicture(byte[] data, int w, int h) { return platform._createAlphaOnlyPicture(data, w, h); }
128 protected Picture _createPicture(int[] b, int w, int h) { return null; }
129 protected Picture _createAlphaOnlyPicture(byte[] b, int w, int h) {
130 int[] b2 = new int[b.length];
131 for(int i=0;i<b.length;i++) b2[i] = (b[i]&0xff) << 24;
132 return _createPicture(b2,w,h);
135 /** should return true if it is safe to supress full-surface dirties immediately after a window resize */
136 public static boolean supressDirtyOnResize() { return platform._supressDirtyOnResize(); }
137 protected boolean _supressDirtyOnResize() { return false; }
139 /** the human-readable name of the key mapped to XWT's 'alt' key */
140 public static String altKeyName() { return platform._altKeyName(); }
141 protected String _altKeyName() { return "alt"; }
143 /** returns the contents of the clipboard */
144 public static Object getClipBoard() { return clipboardReadEnabled ? platform._getClipBoard() : null; }
145 protected String _getClipBoard() { return null; }
147 /** sets the contents of the clipboard */
148 public static void setClipBoard(String s) { platform._setClipBoard(s); }
149 protected void _setClipBoard(String s) { }
151 /** returns the width of the screen, in pixels */
152 public static int getScreenWidth() { return platform._getScreenWidth(); }
153 protected int _getScreenWidth() { return 640; }
155 /** returns the height of the screen, in pixels */
156 public static int getScreenHeight() { return platform._getScreenHeight(); }
157 protected int _getScreenHeight() { return 480; }
159 /** used to notify the user of very serious failures; usually used when logging is not working or unavailable */
160 protected void _criticalAbort(String message) { System.exit(-1); }
162 /** if true, org.xwt.Surface will generate a Click automatically after a press and a release */
163 public static boolean needsAutoClick() { return platform._needsAutoClick(); }
164 protected boolean _needsAutoClick() { return false; }
166 /** if true, org.xwt.Surface will generate a DoubleClick automatically after recieving two clicks in a short period of time */
167 public static boolean needsAutoDoubleClick() { return platform._needsAutoDoubleClick(); }
168 protected boolean _needsAutoDoubleClick() { return false; }
170 /** returns true iff the platform has a case-sensitive filesystem */
171 public static boolean isCaseSensitive() { return platform._isCaseSensitive(); }
172 protected boolean _isCaseSensitive() { return true; }
174 /** returns an InputStream to the builtin xwar */
175 public static InputStream getBuiltinInputStream() { return platform._getBuiltinInputStream(); }
176 protected InputStream _getBuiltinInputStream() {
177 return this.getClass().getClassLoader().getResourceAsStream("org/xwt/builtin.jar");
180 /** returns the value of the environment variable key, or null if no such key exists */
181 public static String getEnv(String key) { return platform._getEnv(key); }
182 protected String _getEnv(String key) {
184 String os = System.getProperty("os.name").toLowerCase();
186 if (os.indexOf("windows 9") != -1 || os.indexOf("windows me") != -1) {
187 // hack -- jdk1.2/1.3 on Win32 pop open an ugly DOS box; 1.4 does not
188 if (platform.getClass().getName().endsWith("Java12")) return null;
189 p = Runtime.getRuntime().exec("command.com /c set");
190 } else if (os.indexOf("windows") > -1) {
191 // hack -- jdk1.2/1.3 on Win32 pop open an ugly DOS box; 1.4 does not
192 if (platform.getClass().getName().endsWith("Java12")) return null;
193 p = Runtime.getRuntime().exec("cmd.exe /c set");
195 p = Runtime.getRuntime().exec("env");
197 BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
199 while ((s = br.readLine()) != null)
200 if (s.startsWith(key + "="))
201 return s.substring(key.length() + 1);
202 } catch (Exception e) {
203 if (Log.on) Log.log(this, "Exception while reading from environment:");
204 if (Log.on) Log.log(this, e);
209 /** convert a JPEG into an Image */
210 public static synchronized Picture decodeJPEG(InputStream is, String name) { return platform._decodeJPEG(is, name); }
211 protected Picture _decodeJPEG(InputStream is, String name) { return null; }
213 /** displays a platform-specific "open file" dialog and returns the chosen filename, or null if the user hit cancel */
214 protected String _fileDialog(String suggestedFileName, boolean write) { return null; }
215 public static String fileDialog(String suggestedFileName, boolean write) throws org.xwt.js.JS.Exn {
216 return platform._fileDialog(suggestedFileName, write);
219 /** default implementation is Eric Albert's BrowserLauncher.java */
220 protected void _newBrowserWindow(String url) {
222 Class c = Class.forName("edu.stanford.ejalbert.BrowserLauncher");
223 Method m = c.getMethod("openURL", new Class[] { String.class });
224 m.invoke(null, new String[] { url });
225 } catch (Exception e) {
230 /** opens a new browser window */
231 public static void newBrowserWindow(String url) {
232 if (!(url.startsWith("https://") || url.startsWith("http://") || url.startsWith("ftp://") || url.startsWith("mailto:"))) {
233 if (Log.on) Log.log(Platform.class, "xwt.newBrowserWindow() only supports http and https urls");
237 // check the URL for well-formedness, as a defense against buffer overflow attacks
240 if (u.startsWith("https")) u = "http" + u.substring(5);
242 } catch (MalformedURLException e) {
243 if (Log.on) Log.log(Platform.class, "URL " + url + " is not well-formed");
244 if (Log.on) Log.log(Platform.class, e);
247 if (Log.on) Log.log(Platform.class, "newBrowserWindow, url = " + url);
248 platform._newBrowserWindow(url);
251 /** used to notify the user of very serious failures; usually used when logging is not working or unavailable */
252 public static void criticalAbort(String message) {
253 if (Log.on) Log.log(Platform.class, "Critical Abort:");
254 if (Log.on) Log.log(Platform.class, message);
255 platform._criticalAbort(message);
258 /** this method invokes the platform _createSurface() method and then enforces a few post-call invariants */
259 protected Surface _createSurface(Box b, boolean framed) { return null; }
260 public static Surface createSurface(Box b, boolean framed, boolean refreshable) {
261 Surface ret = platform._createSurface(b, framed);
262 ret.setInvisible(false);
264 ret.setLimits(b.minwidth, b.minheight, b.maxwidth, b.maxheight);
267 Surface.allSurfaces.addElement(ret);
268 ret.dirty(0, 0, b.width, b.height);
274 /** detects proxy settings */
275 protected synchronized org.xwt.HTTP.Proxy _detectProxy() { return null; }
276 public static synchronized org.xwt.HTTP.Proxy detectProxy() {
278 if (cachedProxyInfo != null) return cachedProxyInfo;
279 if (alreadyDetectedProxy) return null;
280 alreadyDetectedProxy = true;
282 if (Log.on) Log.log(Platform.class, "attempting environment-variable DNS proxy detection");
283 cachedProxyInfo = org.xwt.HTTP.Proxy.detectProxyViaManual();
284 if (cachedProxyInfo != null) return cachedProxyInfo;
286 if (Log.on) Log.log(Platform.class, "attempting " + platform.getClass().getName() + " proxy detection");
287 cachedProxyInfo = platform._detectProxy();
288 if (cachedProxyInfo != null) return cachedProxyInfo;
290 return cachedProxyInfo;
293 /** returns a Scheduler instance; used to implement platform-specific schedulers */
294 protected Scheduler _getScheduler() { return new Scheduler(); }
295 public static Scheduler getScheduler() { return platform._getScheduler(); }
297 public static void running() { platform._running(); }
298 public void _running() { new Semaphore().block(); }