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16
19
20 import java.applet.Applet  ;
21
22 import java.awt.BorderLayout ;
23 import java.awt.Button ;
24 import java.awt.Frame ;
25 import java.awt.Label ;
26 import java.awt.Panel ;
27 import java.awt.event.ActionEvent ;
28 import java.awt.event.ActionListener ;
29
30 import java.io.PrintWriter ;
31 import java.io.StringWriter ;
32
33 import javax.xml.transform.Transformer ;
34 import javax.xml.transform.TransformerFactory ;
35 import javax.xml.transform.TransformerException ;
36 import javax.xml.transform.ErrorListener ;
37 import javax.xml.transform.stream.StreamResult ;
38 import javax.xml.transform.stream.StreamSource ;
39
40
52 public final class TransformApplet extends Applet {
53 TransformerFactory tf;
54 TransformDelegate transformThread;
55
58 public class MessageFrame extends Frame {
59
60 public Frame frame;
61
62 public class ButtonHandler implements ActionListener {
63 public void actionPerformed(ActionEvent e) {
64 frame.setVisible(false);
65 }
66 }
67
68
72 public MessageFrame(String title, String message) {
73 super(title);
74 frame = this; setSize(320,200);
76
77 Panel center = new Panel ();
79 center.add(new Label (message));
80
81 Panel bottom = new Panel ();
83 Button okButton = new Button (" OK ");
84 okButton.addActionListener(new ButtonHandler());
85 bottom.add(okButton);
86
87 add(center, BorderLayout.CENTER);
89 add(bottom,BorderLayout.SOUTH);
90
91 setVisible(true);
93 }
94
95 }
96
97
101 public class AppletErrorListener implements ErrorListener {
102 public void displayMessage(TransformerException e) {
103 MessageFrame z = new MessageFrame("XSL transformation alert",
104 e.getMessageAndLocation());
105 }
106
107 public void error(TransformerException e) {
108 displayMessage(e);
109 }
110
111 public void fatalError(TransformerException e) {
112 displayMessage(e);
113 }
114
115 public void warning(TransformerException e) {
116 displayMessage(e);
117 }
118 }
119
120
124 public synchronized String transform(Object arg1, Object arg2) {
125 final String stylesheetURL = (String )arg1;
126 final String documentURL = (String )arg2;
127
128 transformThread.setStylesheetURL(stylesheetURL);
129 transformThread.setDocumentURL(documentURL);
130 transformThread.setWaiting(false);
131 transformThread.wakeUp();
132 try{
133 wait();
134 } catch (InterruptedException e){}
135 return transformThread.getOutput();
136 }
137
138 public void start() {
139 transform(getParameter("stylesheet-name"),
140 getParameter("input-document"));
141 }
142 public void destroy() {
143 transformThread.destroy();
144 }
145 public void init() {
146 tf = TransformerFactory.newInstance();
147 try {
148 tf.setAttribute("use-classpath", Boolean.TRUE);
149 } catch (IllegalArgumentException iae) {
150 System.err.println("Could not set XSLTC-specific TransformerFactory"
151 + " attributes. Transformation failed.");
152 }
153 transformThread = new TransformDelegate(true);
158 Thread t = new Thread (transformThread);
159 t.setName("transformThread");
160 t.start();
161 }
162 public String getOutput(){
163 return transformThread.getOutput();
164 }
165 public synchronized void wakeUp() {
166 notifyAll();
167 }
168 class TransformDelegate implements Runnable {
169 private boolean isRunning, isWaiting;
170 private String stylesheetURL, documentURL;
171 private String outPut;
172 public TransformDelegate(boolean arg) {
173 isRunning = arg;
174 isWaiting = true;
175 }
176 public synchronized void run() {
177 while(isRunning){
178 while(isWaiting){
179 try {
180 wait();
181 } catch (InterruptedException e){}
182 }
183 transform();
184 isWaiting = true;
185 TransformApplet.this.wakeUp();
186 }
187 }
188
189 public void setStylesheetURL(String arg){
190 stylesheetURL = arg;
191 }
192 public void setDocumentURL(String arg) {
193 documentURL = arg;
194 }
195 public String getStylesheetURL(){
196 return stylesheetURL;
197 }
198 public String getDocumentURL() {
199 return documentURL;
200 }
201 public void setWaiting(boolean arg) {
202 isWaiting = arg;
203 }
204 public void destroy() {
205 isRunning = false;
206 }
207 public synchronized void wakeUp() {
208 notifyAll();
209 }
210 public String getOutput(){
211 return outPut;
212 }
213
214 public void transform(){
215 String xslURL = getStylesheetURL();
216 String docURL = getDocumentURL();
217 StringWriter sout = new StringWriter ();
219 PrintWriter out = new PrintWriter (sout);
220 try {
222 if (xslURL == null || docURL == null) {
223 out.println("<h1>Transformation error</h1>");
224 out.println("The parameters <b><tt>stylesheetURL</tt></b> "+
225 "and <b><tt>source</tt></b> must be specified");
226 } else {
227 Transformer t = tf.newTransformer(new StreamSource (xslURL));
228 t.setErrorListener(new AppletErrorListener());
229
230 final long start = System.currentTimeMillis();
231
232 t.transform(new StreamSource (docURL),
233 new StreamResult (out));
234
235 final long done = System.currentTimeMillis() - start;
236 out.println("<!-- transformed by XSLTC in " + done
237 + "msecs -->");
238 }
239 out.close();
242 System.err.println("Transformation complete!");
243 System.err.println(sout.toString());
244 outPut = sout.toString();
245 sout.close();
246 } catch (RuntimeException e) {
247 out.println("<h1>RTE</h1>");
248 out.close();
249 outPut = sout.toString();
250 } catch (Exception e) {
251 out.println("<h1>exception</h1>");
252 out.println(e.toString());
253 out.close();
254 outPut = sout.toString();
255 }
256 }
257 }
258 }
259 |
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