Java example source code file (AppletViewer.java)
The AppletViewer.java Java example source code
/*
* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.applet;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;
import javax.print.attribute.*;
import java.applet.*;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.SocketPermission;
import sun.misc.Ref;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import sun.awt.SunToolkit;
import sun.awt.AppContext;
import java.lang.ref.WeakReference;
/**
* A frame to show the applet tag in.
*/
class TextFrame extends Frame {
/**
* Create the tag frame.
*/
TextFrame(int x, int y, String title, String text) {
setTitle(title);
TextArea txt = new TextArea(20, 60);
txt.setText(text);
txt.setEditable(false);
add("Center", txt);
Panel p = new Panel();
add("South", p);
Button b = new Button(amh.getMessage("button.dismiss", "Dismiss"));
p.add(b);
class ActionEventListener implements ActionListener {
public void actionPerformed(ActionEvent evt) {
dispose();
}
}
b.addActionListener(new ActionEventListener());
pack();
move(x, y);
setVisible(true);
WindowListener windowEventListener = new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
dispose();
}
};
addWindowListener(windowEventListener);
}
private static AppletMessageHandler amh = new AppletMessageHandler("textframe");
}
/**
* Lets us construct one using unix-style one shot behaviors
*/
class StdAppletViewerFactory implements AppletViewerFactory
{
public AppletViewer createAppletViewer(int x, int y,
URL doc, Hashtable atts) {
return new AppletViewer(x, y, doc, atts, System.out, this);
}
public MenuBar getBaseMenuBar() {
return new MenuBar();
}
public boolean isStandalone() {
return true;
}
}
/**
* The applet viewer makes it possible to run a Java applet without using a browser.
* For details on the syntax that <B>appletviewer supports, see
* <a href="../../../docs/tooldocs/appletviewertags.html">AppletViewer Tags.
* (The document named appletviewertags.html in the JDK's docs/tooldocs directory,
* once the JDK docs have been installed.)
*/
public class AppletViewer extends Frame implements AppletContext,
Printable {
/**
* Some constants...
*/
private static String defaultSaveFile = "Applet.ser";
/**
* The panel in which the applet is being displayed.
*/
AppletViewerPanel panel;
/**
* The status line.
*/
Label label;
/**
* output status messages to this stream
*/
PrintStream statusMsgStream;
/**
* For cloning
*/
AppletViewerFactory factory;
private final class UserActionListener implements ActionListener {
public void actionPerformed(ActionEvent evt) {
processUserAction(evt);
}
}
/**
* Create the applet viewer
*/
public AppletViewer(int x, int y, URL doc, Hashtable atts,
PrintStream statusMsgStream, AppletViewerFactory factory) {
this.factory = factory;
this.statusMsgStream = statusMsgStream;
setTitle(amh.getMessage("tool.title", atts.get("code")));
MenuBar mb = factory.getBaseMenuBar();
Menu m = new Menu(amh.getMessage("menu.applet"));
addMenuItem(m, "menuitem.restart");
addMenuItem(m, "menuitem.reload");
addMenuItem(m, "menuitem.stop");
addMenuItem(m, "menuitem.save");
addMenuItem(m, "menuitem.start");
addMenuItem(m, "menuitem.clone");
m.add(new MenuItem("-"));
addMenuItem(m, "menuitem.tag");
addMenuItem(m, "menuitem.info");
addMenuItem(m, "menuitem.edit").disable();
addMenuItem(m, "menuitem.encoding");
m.add(new MenuItem("-"));
addMenuItem(m, "menuitem.print");
m.add(new MenuItem("-"));
addMenuItem(m, "menuitem.props");
m.add(new MenuItem("-"));
addMenuItem(m, "menuitem.close");
if (factory.isStandalone()) {
addMenuItem(m, "menuitem.quit");
}
mb.add(m);
setMenuBar(mb);
add("Center", panel = new AppletViewerPanel(doc, atts));
add("South", label = new Label(amh.getMessage("label.hello")));
panel.init();
appletPanels.addElement(panel);
pack();
move(x, y);
setVisible(true);
WindowListener windowEventListener = new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
appletClose();
}
public void windowIconified(WindowEvent evt) {
appletStop();
}
public void windowDeiconified(WindowEvent evt) {
appletStart();
}
};
class AppletEventListener implements AppletListener
{
final Frame frame;
public AppletEventListener(Frame frame)
{
this.frame = frame;
}
public void appletStateChanged(AppletEvent evt)
{
AppletPanel src = (AppletPanel)evt.getSource();
switch (evt.getID()) {
case AppletPanel.APPLET_RESIZE: {
if(src != null) {
resize(preferredSize());
validate();
}
break;
}
case AppletPanel.APPLET_LOADING_COMPLETED: {
Applet a = src.getApplet(); // sun.applet.AppletPanel
// Fixed #4754451: Applet can have methods running on main
// thread event queue.
//
// The cause of this bug is that the frame of the applet
// is created in main thread group. Thus, when certain
// AWT/Swing events are generated, the events will be
// dispatched through the wrong event dispatch thread.
//
// To fix this, we rearrange the AppContext with the frame,
// so the proper event queue will be looked up.
//
// Swing also maintains a Frame list for the AppContext,
// so we will have to rearrange it as well.
//
if (a != null)
AppletPanel.changeFrameAppContext(frame, SunToolkit.targetToAppContext(a));
else
AppletPanel.changeFrameAppContext(frame, AppContext.getAppContext());
break;
}
}
}
};
addWindowListener(windowEventListener);
panel.addAppletListener(new AppletEventListener(this));
// Start the applet
showStatus(amh.getMessage("status.start"));
initEventQueue();
}
// XXX 99/9/10 probably should be "private"
public MenuItem addMenuItem(Menu m, String s) {
MenuItem mItem = new MenuItem(amh.getMessage(s));
mItem.addActionListener(new UserActionListener());
return m.add(mItem);
}
/**
* Send the initial set of events to the appletviewer event queue.
* On start-up the current behaviour is to load the applet and call
* Applet.init() and Applet.start().
*/
private void initEventQueue() {
// appletviewer.send.event is an undocumented and unsupported system
// property which is used exclusively for testing purposes.
String eventList = System.getProperty("appletviewer.send.event");
if (eventList == null) {
// Add the standard events onto the event queue.
panel.sendEvent(AppletPanel.APPLET_LOAD);
panel.sendEvent(AppletPanel.APPLET_INIT);
panel.sendEvent(AppletPanel.APPLET_START);
} else {
// We're testing AppletViewer. Force the specified set of events
// onto the event queue, wait for the events to be processed, and
// exit.
// The list of events that will be executed is provided as a
// ","-separated list. No error-checking will be done on the list.
String [] events = splitSeparator(",", eventList);
for (int i = 0; i < events.length; i++) {
System.out.println("Adding event to queue: " + events[i]);
if (events[i].equals("dispose"))
panel.sendEvent(AppletPanel.APPLET_DISPOSE);
else if (events[i].equals("load"))
panel.sendEvent(AppletPanel.APPLET_LOAD);
else if (events[i].equals("init"))
panel.sendEvent(AppletPanel.APPLET_INIT);
else if (events[i].equals("start"))
panel.sendEvent(AppletPanel.APPLET_START);
else if (events[i].equals("stop"))
panel.sendEvent(AppletPanel.APPLET_STOP);
else if (events[i].equals("destroy"))
panel.sendEvent(AppletPanel.APPLET_DESTROY);
else if (events[i].equals("quit"))
panel.sendEvent(AppletPanel.APPLET_QUIT);
else if (events[i].equals("error"))
panel.sendEvent(AppletPanel.APPLET_ERROR);
else
// non-fatal error if we get an unrecognized event
System.out.println("Unrecognized event name: " + events[i]);
}
while (!panel.emptyEventQueue()) ;
appletSystemExit();
}
}
/**
* Split a string based on the presence of a specified separator. Returns
* an array of arbitrary length. The end of each element in the array is
* indicated by the separator of the end of the string. If there is a
* separator immediately before the end of the string, the final element
* will be empty. None of the strings will contain the separator. Useful
* when separating strings such as "foo/bar/bas" using separator "/".
*
* @param sep The separator.
* @param s The string to split.
* @return An array of strings. Each string in the array is determined
* by the location of the provided sep in the original string,
* s. Whitespace not stripped.
*/
private String [] splitSeparator(String sep, String s) {
Vector v = new Vector();
int tokenStart = 0;
int tokenEnd = 0;
while ((tokenEnd = s.indexOf(sep, tokenStart)) != -1) {
v.addElement(s.substring(tokenStart, tokenEnd));
tokenStart = tokenEnd+1;
}
// Add the final element.
v.addElement(s.substring(tokenStart));
String [] retVal = new String[v.size()];
v.copyInto(retVal);
return retVal;
}
/*
* Methods for java.applet.AppletContext
*/
private static Map audioClips = new HashMap();
/**
* Get an audio clip.
*/
public AudioClip getAudioClip(URL url) {
checkConnect(url);
synchronized (audioClips) {
AudioClip clip = (AudioClip)audioClips.get(url);
if (clip == null) {
audioClips.put(url, clip = new AppletAudioClip(url));
}
return clip;
}
}
private static Map imageRefs = new HashMap();
/**
* Get an image.
*/
public Image getImage(URL url) {
return getCachedImage(url);
}
static Image getCachedImage(URL url) {
// System.getSecurityManager().checkConnection(url.getHost(), url.getPort());
return (Image)getCachedImageRef(url).get();
}
/**
* Get an image ref.
*/
static Ref getCachedImageRef(URL url) {
synchronized (imageRefs) {
AppletImageRef ref = (AppletImageRef)imageRefs.get(url);
if (ref == null) {
ref = new AppletImageRef(url);
imageRefs.put(url, ref);
}
return ref;
}
}
/**
* Flush the image cache.
*/
static void flushImageCache() {
imageRefs.clear();
}
static Vector appletPanels = new Vector();
/**
* Get an applet by name.
*/
public Applet getApplet(String name) {
AppletSecurity security = (AppletSecurity)System.getSecurityManager();
name = name.toLowerCase();
SocketPermission panelSp =
new SocketPermission(panel.getCodeBase().getHost(), "connect");
for (Enumeration e = appletPanels.elements() ; e.hasMoreElements() ;) {
AppletPanel p = (AppletPanel)e.nextElement();
String param = p.getParameter("name");
if (param != null) {
param = param.toLowerCase();
}
if (name.equals(param) &&
p.getDocumentBase().equals(panel.getDocumentBase())) {
SocketPermission sp =
new SocketPermission(p.getCodeBase().getHost(), "connect");
if (panelSp.implies(sp)) {
return p.applet;
}
}
}
return null;
}
/**
* Return an enumeration of all the accessible
* applets on this page.
*/
public Enumeration getApplets() {
AppletSecurity security = (AppletSecurity)System.getSecurityManager();
Vector v = new Vector();
SocketPermission panelSp =
new SocketPermission(panel.getCodeBase().getHost(), "connect");
for (Enumeration e = appletPanels.elements() ; e.hasMoreElements() ;) {
AppletPanel p = (AppletPanel)e.nextElement();
if (p.getDocumentBase().equals(panel.getDocumentBase())) {
SocketPermission sp =
new SocketPermission(p.getCodeBase().getHost(), "connect");
if (panelSp.implies(sp)) {
v.addElement(p.applet);
}
}
}
return v.elements();
}
/**
* Ignore.
*/
public void showDocument(URL url) {
}
/**
* Ignore.
*/
public void showDocument(URL url, String target) {
}
/**
* Show status.
*/
public void showStatus(String status) {
label.setText(status);
}
public void setStream(String key, InputStream stream)throws IOException{
// We do nothing.
}
public InputStream getStream(String key){
// We do nothing.
return null;
}
public Iterator getStreamKeys(){
// We do nothing.
return null;
}
/**
* System parameters.
*/
static Hashtable systemParam = new Hashtable();
static {
systemParam.put("codebase", "codebase");
systemParam.put("code", "code");
systemParam.put("alt", "alt");
systemParam.put("width", "width");
systemParam.put("height", "height");
systemParam.put("align", "align");
systemParam.put("vspace", "vspace");
systemParam.put("hspace", "hspace");
}
/**
* Print the HTML tag.
*/
public static void printTag(PrintStream out, Hashtable atts) {
out.print("<applet");
String v = (String)atts.get("codebase");
if (v != null) {
out.print(" codebase=\"" + v + "\"");
}
v = (String)atts.get("code");
if (v == null) {
v = "applet.class";
}
out.print(" code=\"" + v + "\"");
v = (String)atts.get("width");
if (v == null) {
v = "150";
}
out.print(" width=" + v);
v = (String)atts.get("height");
if (v == null) {
v = "100";
}
out.print(" height=" + v);
v = (String)atts.get("name");
if (v != null) {
out.print(" name=\"" + v + "\"");
}
out.println(">");
// A very slow sorting algorithm
int len = atts.size();
String params[] = new String[len];
len = 0;
for (Enumeration e = atts.keys() ; e.hasMoreElements() ;) {
String param = (String)e.nextElement();
int i = 0;
for (; i < len ; i++) {
if (params[i].compareTo(param) >= 0) {
break;
}
}
System.arraycopy(params, i, params, i + 1, len - i);
params[i] = param;
len++;
}
for (int i = 0 ; i < len ; i++) {
String param = params[i];
if (systemParam.get(param) == null) {
out.println("<param name=" + param +
" value=\"" + atts.get(param) + "\">");
}
}
out.println("</applet>");
}
/**
* Make sure the atrributes are uptodate.
*/
public void updateAtts() {
Dimension d = panel.size();
Insets in = panel.insets();
panel.atts.put("width",
Integer.toString(d.width - (in.left + in.right)));
panel.atts.put("height",
Integer.toString(d.height - (in.top + in.bottom)));
}
/**
* Restart the applet.
*/
void appletRestart() {
panel.sendEvent(AppletPanel.APPLET_STOP);
panel.sendEvent(AppletPanel.APPLET_DESTROY);
panel.sendEvent(AppletPanel.APPLET_INIT);
panel.sendEvent(AppletPanel.APPLET_START);
}
/**
* Reload the applet.
*/
void appletReload() {
panel.sendEvent(AppletPanel.APPLET_STOP);
panel.sendEvent(AppletPanel.APPLET_DESTROY);
panel.sendEvent(AppletPanel.APPLET_DISPOSE);
/**
* Fixed #4501142: Classlaoder sharing policy doesn't
* take "archive" into account. This will be overridden
* by Java Plug-in. [stanleyh]
*/
AppletPanel.flushClassLoader(panel.getClassLoaderCacheKey());
/*
* Make sure we don't have two threads running through the event queue
* at the same time.
*/
try {
panel.joinAppletThread();
panel.release();
} catch (InterruptedException e) {
return; // abort the reload
}
panel.createAppletThread();
panel.sendEvent(AppletPanel.APPLET_LOAD);
panel.sendEvent(AppletPanel.APPLET_INIT);
panel.sendEvent(AppletPanel.APPLET_START);
}
/**
* Save the applet to a well known file (for now) as a serialized object
*/
void appletSave() {
AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
// XXX: this privileged block should be made smaller
// by initializing a private static variable with "user.dir"
// Applet needs to be stopped for serialization to succeed.
// Since panel.sendEvent only queues the event, there is a
// chance that the event will not be processed before
// serialization begins. However, by sending the event before
// FileDialog is created, enough time is given such that this
// situation is unlikely to ever occur.
panel.sendEvent(AppletPanel.APPLET_STOP);
FileDialog fd = new FileDialog(AppletViewer.this,
amh.getMessage("appletsave.filedialogtitle"),
FileDialog.SAVE);
// needed for a bug under Solaris...
fd.setDirectory(System.getProperty("user.dir"));
fd.setFile(defaultSaveFile);
fd.show();
String fname = fd.getFile();
if (fname == null) {
// Restart applet if Save is cancelled.
panel.sendEvent(AppletPanel.APPLET_START);
return null; // cancelled
}
String dname = fd.getDirectory();
File file = new File(dname, fname);
try (FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fos);
ObjectOutputStream os = new ObjectOutputStream(bos)) {
showStatus(amh.getMessage("appletsave.err1", panel.applet.toString(), file.toString()));
os.writeObject(panel.applet);
} catch (IOException ex) {
System.err.println(amh.getMessage("appletsave.err2", ex));
} finally {
panel.sendEvent(AppletPanel.APPLET_START);
}
return null;
}
});
}
/**
* Clone the viewer and the applet.
*/
void appletClone() {
Point p = location();
updateAtts();
factory.createAppletViewer(p.x + XDELTA, p.y + YDELTA,
panel.documentURL, (Hashtable)panel.atts.clone());
}
/**
* Show the applet tag.
*/
void appletTag() {
ByteArrayOutputStream out = new ByteArrayOutputStream();
updateAtts();
printTag(new PrintStream(out), panel.atts);
showStatus(amh.getMessage("applettag"));
Point p = location();
new TextFrame(p.x + XDELTA, p.y + YDELTA, amh.getMessage("applettag.textframe"), out.toString());
}
/**
* Show the applet info.
*/
void appletInfo() {
String str = panel.applet.getAppletInfo();
if (str == null) {
str = amh.getMessage("appletinfo.applet");
}
str += "\n\n";
String atts[][] = panel.applet.getParameterInfo();
if (atts != null) {
for (int i = 0 ; i < atts.length ; i++) {
str += atts[i][0] + " -- " + atts[i][1] + " -- " + atts[i][2] + "\n";
}
} else {
str += amh.getMessage("appletinfo.param");
}
Point p = location();
new TextFrame(p.x + XDELTA, p.y + YDELTA, amh.getMessage("appletinfo.textframe"), str);
}
/**
* Show character encoding type
*/
void appletCharacterEncoding() {
showStatus(amh.getMessage("appletencoding", encoding));
}
/**
* Edit the applet.
*/
void appletEdit() {
}
/**
* Print the applet.
*/
void appletPrint() {
PrinterJob pj = PrinterJob.getPrinterJob();
if (pj != null) {
PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
if (pj.printDialog(aset)) {
pj.setPrintable(this);
try {
pj.print(aset);
statusMsgStream.println(amh.getMessage("appletprint.finish"));
} catch (PrinterException e) {
statusMsgStream.println(amh.getMessage("appletprint.fail"));
}
} else {
statusMsgStream.println(amh.getMessage("appletprint.cancel"));
}
} else {
statusMsgStream.println(amh.getMessage("appletprint.fail"));
}
}
public int print(Graphics graphics, PageFormat pf, int pageIndex) {
if (pageIndex > 0) {
return Printable.NO_SUCH_PAGE;
} else {
Graphics2D g2d = (Graphics2D)graphics;
g2d.translate(pf.getImageableX(), pf.getImageableY());
panel.applet.printAll(graphics);
return Printable.PAGE_EXISTS;
}
}
/**
* Properties.
*/
static AppletProps props;
public static synchronized void networkProperties() {
if (props == null) {
props = new AppletProps();
}
props.addNotify();
props.setVisible(true);
}
/**
* Start the applet.
*/
void appletStart() {
panel.sendEvent(AppletPanel.APPLET_START);
}
/**
* Stop the applet.
*/
void appletStop() {
panel.sendEvent(AppletPanel.APPLET_STOP);
}
/**
* Shutdown a viewer.
* Stop, Destroy, Dispose and Quit a viewer
*/
private void appletShutdown(AppletPanel p) {
p.sendEvent(AppletPanel.APPLET_STOP);
p.sendEvent(AppletPanel.APPLET_DESTROY);
p.sendEvent(AppletPanel.APPLET_DISPOSE);
p.sendEvent(AppletPanel.APPLET_QUIT);
}
/**
* Close this viewer.
* Stop, Destroy, Dispose and Quit an AppletView, then
* reclaim resources and exit the program if this is
* the last applet.
*/
void appletClose() {
// The caller thread is event dispatch thread, so
// spawn a new thread to avoid blocking the event queue
// when calling appletShutdown.
//
final AppletPanel p = panel;
new Thread(new Runnable()
{
public void run()
{
appletShutdown(p);
appletPanels.removeElement(p);
dispose();
if (countApplets() == 0) {
appletSystemExit();
}
}
}).start();
}
/**
* Exit the program.
* Exit from the program (if not stand alone) - do no clean-up
*/
private void appletSystemExit() {
if (factory.isStandalone())
System.exit(0);
}
/**
* Quit all viewers.
* Shutdown all viewers properly then
* exit from the program (if not stand alone)
*/
protected void appletQuit()
{
// The caller thread is event dispatch thread, so
// spawn a new thread to avoid blocking the event queue
// when calling appletShutdown.
//
new Thread(new Runnable()
{
public void run()
{
for (Enumeration e = appletPanels.elements() ; e.hasMoreElements() ;) {
AppletPanel p = (AppletPanel)e.nextElement();
appletShutdown(p);
}
appletSystemExit();
}
}).start();
}
/**
* Handle events.
*/
public void processUserAction(ActionEvent evt) {
String label = ((MenuItem)evt.getSource()).getLabel();
if (amh.getMessage("menuitem.restart").equals(label)) {
appletRestart();
return;
}
if (amh.getMessage("menuitem.reload").equals(label)) {
appletReload();
return;
}
if (amh.getMessage("menuitem.clone").equals(label)) {
appletClone();
return;
}
if (amh.getMessage("menuitem.stop").equals(label)) {
appletStop();
return;
}
if (amh.getMessage("menuitem.save").equals(label)) {
appletSave();
return;
}
if (amh.getMessage("menuitem.start").equals(label)) {
appletStart();
return;
}
if (amh.getMessage("menuitem.tag").equals(label)) {
appletTag();
return;
}
if (amh.getMessage("menuitem.info").equals(label)) {
appletInfo();
return;
}
if (amh.getMessage("menuitem.encoding").equals(label)) {
appletCharacterEncoding();
return;
}
if (amh.getMessage("menuitem.edit").equals(label)) {
appletEdit();
return;
}
if (amh.getMessage("menuitem.print").equals(label)) {
appletPrint();
return;
}
if (amh.getMessage("menuitem.props").equals(label)) {
networkProperties();
return;
}
if (amh.getMessage("menuitem.close").equals(label)) {
appletClose();
return;
}
if (factory.isStandalone() && amh.getMessage("menuitem.quit").equals(label)) {
appletQuit();
return;
}
//statusMsgStream.println("evt = " + evt);
}
/**
* How many applets are running?
*/
public static int countApplets() {
return appletPanels.size();
}
/**
* The current character.
*/
static int c;
/**
* Scan spaces.
*/
public static void skipSpace(Reader in) throws IOException {
while ((c >= 0) &&
((c == ' ') || (c == '\t') || (c == '\n') || (c == '\r'))) {
c = in.read();
}
}
/**
* Scan identifier
*/
public static String scanIdentifier(Reader in) throws IOException {
StringBuffer buf = new StringBuffer();
while (true) {
if (((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) || (c == '_')) {
buf.append((char)c);
c = in.read();
} else {
return buf.toString();
}
}
}
/**
* Scan tag
*/
public static Hashtable scanTag(Reader in) throws IOException {
Hashtable atts = new Hashtable();
skipSpace(in);
while (c >= 0 && c != '>') {
String att = scanIdentifier(in);
String val = "";
skipSpace(in);
if (c == '=') {
int quote = -1;
c = in.read();
skipSpace(in);
if ((c == '\'') || (c == '\"')) {
quote = c;
c = in.read();
}
StringBuffer buf = new StringBuffer();
while ((c > 0) &&
(((quote < 0) && (c != ' ') && (c != '\t') &&
(c != '\n') && (c != '\r') && (c != '>'))
|| ((quote >= 0) && (c != quote)))) {
buf.append((char)c);
c = in.read();
}
if (c == quote) {
c = in.read();
}
skipSpace(in);
val = buf.toString();
}
//statusMsgStream.println("PUT " + att + " = '" + val + "'");
if (! val.equals("")) {
atts.put(att.toLowerCase(java.util.Locale.ENGLISH), val);
}
while (true) {
if ((c == '>') || (c < 0) ||
((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')) || (c == '_'))
break;
c = in.read();
}
//skipSpace(in);
}
return atts;
}
/* values used for placement of AppletViewer's frames */
private static int x = 0;
private static int y = 0;
private static final int XDELTA = 30;
private static final int YDELTA = XDELTA;
static String encoding = null;
static private Reader makeReader(InputStream is) {
if (encoding != null) {
try {
return new BufferedReader(new InputStreamReader(is, encoding));
} catch (IOException x) { }
}
InputStreamReader r = new InputStreamReader(is);
encoding = r.getEncoding();
return new BufferedReader(r);
}
/**
* Scan an html file for <applet> tags
*/
public static void parse(URL url, String enc) throws IOException {
encoding = enc;
parse(url, System.out, new StdAppletViewerFactory());
}
public static void parse(URL url) throws IOException {
parse(url, System.out, new StdAppletViewerFactory());
}
public static void parse(URL url, PrintStream statusMsgStream,
AppletViewerFactory factory) throws IOException {
// <OBJECT>
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