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Posted to commits@xalan.apache.org by zo...@apache.org on 2003/04/06 22:36:15 UTC
cvs commit: xml-xalan/java/samples/CompiledApplet TransformApplet.java
zongaro 2003/04/06 13:36:15
Modified: java/samples/CompiledApplet TransformApplet.java
Log:
Patch from Christine Li (jycli@ca.ibm.com). Reworked applet code so that the
init method creates a thread to which it delegates all the work of creating
Transformers and performing transformations.
Xalan needs all of its classes to be loaded with respect to the same class
loader. The thread that's created will have the context class loader, if any,
that is in effect when the applet's init method is called, but calls to other
methods on the applet might not have the same context class loader. Using a
thread avoids any problems that might arise from such a situation.
Revision Changes Path
1.8 +127 -55 xml-xalan/java/samples/CompiledApplet/TransformApplet.java
Index: TransformApplet.java
===================================================================
RCS file: /home/cvs/xml-xalan/java/samples/CompiledApplet/TransformApplet.java,v
retrieving revision 1.7
retrieving revision 1.8
diff -u -r1.7 -r1.8
--- TransformApplet.java 2 Apr 2003 17:26:03 -0000 1.7
+++ TransformApplet.java 6 Apr 2003 20:36:15 -0000 1.8
@@ -91,7 +91,8 @@
* and that that should be used in preference to recompiling the stylesheet.
*/
public final class TransformApplet extends Applet {
-
+ TransformerFactory tf;
+ TransformDelegate transformThread;
/**
* This class implements a dialog box used for XSL messages/comments
*/
@@ -153,7 +154,7 @@
}
public void warning(TransformerException e) {
- displayMessage(e);
+ displayMessage(e);
}
}
@@ -161,67 +162,138 @@
* This method is the main body of the applet. The method is called
* by some JavaScript code in an HTML document.
*/
- public String transform(Object arg1, Object arg2) {
- // Convert the two arguments to strings.
+ public synchronized String transform(Object arg1, Object arg2) {
final String stylesheetURL = (String)arg1;
final String documentURL = (String)arg2;
- // Initialise the output stream
- final StringWriter sout = new StringWriter();
- final PrintWriter out = new PrintWriter(sout);
+ transformThread.setStylesheetURL(stylesheetURL);
+ transformThread.setDocumentURL(documentURL);
+ transformThread.setWaiting(false);
+ transformThread.wakeUp();
+ try{
+ wait();
+ } catch (InterruptedException e){}
+ return transformThread.getOutput();
+ }
+ public void start() {
+ transform(getParameter("stylesheet-name"),
+ getParameter("input-document"));
+ }
+ public void destroy() {
+ transformThread.destroy();
+ }
+ public void init() {
+ tf = TransformerFactory.newInstance();
try {
- // Check that the parameters are valid
- if (stylesheetURL == null || documentURL == null) {
- out.println("<h1>Transformation error</h1>");
- out.println("The parameters <b><tt>stylesheetURL</tt></b> "+
- "and <b><tt>source</tt></b> must be specified");
- }
- else {
- TransformerFactory tf = null;
- tf = TransformerFactory.newInstance();
-
- try {
- tf.setAttribute("use-classpath", Boolean.TRUE);
- } catch (IllegalArgumentException iae) {
- System.err.println(
- "Could not set XSLTC-specific TransformerFactory "
- + "attributes. Transformation failed.");
+ tf.setAttribute("use-classpath", Boolean.TRUE);
+ } catch (IllegalArgumentException iae) {
+ System.err.println("Could not set XSLTC-specific TransformerFactory"
+ + " attributes. Transformation failed.");
+ }
+ // Another thread is created to keep the context class loader
+ // information. When use JDK 1.4 plugin for browser, to get around the
+ // problem with the bundled old version of xalan and endorsed class
+ // loading mechanism
+ transformThread = new TransformDelegate(true);
+ Thread t = new Thread(transformThread);
+ t.setName("transformThread");
+ t.start();
+ }
+ public String getOutput(){
+ return transformThread.getOutput();
+ }
+ public synchronized void wakeUp() {
+ notifyAll();
+ }
+ class TransformDelegate implements Runnable {
+ private boolean isRunning, isWaiting;
+ private String stylesheetURL, documentURL;
+ private String outPut;
+ public TransformDelegate(boolean arg) {
+ isRunning = arg;
+ isWaiting = true;
+ }
+ public synchronized void run() {
+ while(isRunning){
+ while(isWaiting){
+ try {
+ wait();
+ } catch (InterruptedException e){}
}
- Transformer t =
- tf.newTransformer(new StreamSource(stylesheetURL));
- t.setErrorListener(new AppletErrorListener());
-
- final long start = System.currentTimeMillis();
+ transform();
+ isWaiting = true;
+ TransformApplet.this.wakeUp();
+ }
+ }
- t.transform(new StreamSource(documentURL),
- new StreamResult(out));
+ public void setStylesheetURL(String arg){
+ stylesheetURL = arg;
+ }
+ public void setDocumentURL(String arg) {
+ documentURL = arg;
+ }
+ public String getStylesheetURL(){
+ return stylesheetURL;
+ }
+ public String getDocumentURL() {
+ return documentURL;
+ }
+ public void setWaiting(boolean arg) {
+ isWaiting = arg;
+ }
+ public void destroy() {
+ isRunning = false;
+ }
+ public synchronized void wakeUp() {
+ notifyAll();
+ }
+ public String getOutput(){
+ return outPut;
+ }
- final long done = System.currentTimeMillis() - start;
- out.println("<!-- transformed by XSLTC in "+done+"msecs -->");
+ public void transform(){
+ String xslURL = getStylesheetURL();
+ String docURL = getDocumentURL();
+ // Initialise the output stream
+ StringWriter sout = new StringWriter();
+ PrintWriter out = new PrintWriter(sout);
+ // Check that the parameters are valid
+ try {
+ if (xslURL == null || docURL == null) {
+ out.println("<h1>Transformation error</h1>");
+ out.println("The parameters <b><tt>stylesheetURL</tt></b> "+
+ "and <b><tt>source</tt></b> must be specified");
+ } else {
+ Transformer t = tf.newTransformer(new StreamSource(xslURL));
+ t.setErrorListener(new AppletErrorListener());
+
+ final long start = System.currentTimeMillis();
+
+ t.transform(new StreamSource(docURL),
+ new StreamResult(out));
+
+ final long done = System.currentTimeMillis() - start;
+ out.println("<!-- transformed by XSLTC in " + done
+ + "msecs -->");
+ }
+ // Now close up the sink, and return the HTML output in the
+ // StringWrite object as a string.
+ out.close();
+ System.err.println("Transformation complete!");
+ System.err.println(sout.toString());
+ outPut = sout.toString();
+ sout.close();
+ } catch (RuntimeException e) {
+ out.println("<h1>RTE</h1>");
+ out.close();
+ outPut = sout.toString();
+ } catch (Exception e) {
+ out.println("<h1>exception</h1>");
+ out.println(e.toString());
+ out.close();
+ outPut = sout.toString();
}
- // Now close up the sink, and return the HTML output in the
- // StringWrite object as a string.
- out.close();
- System.err.println("Transformation complete!");
- System.err.println(sout.toString());
- return sout.toString();
- }
- catch (RuntimeException e) {
- out.println("<h1>RTE</h1>");
- out.close();
- return sout.toString();
- }
- catch (Exception e) {
- out.println("<h1>exception</h1>");
- out.println(e.toString());
- out.close();
- return sout.toString();
}
- }
-
- public void start() {
- String result = transform(getParameter("stylesheet-name"),
- getParameter("input-document"));
}
}
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