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// (jEdit options) :folding=explicit:collapseFolds=1:
import java.applet.*;
import java.awt.*;
import java.net.*;
/**
* <code>JavaCheck</code> is Java 1.0 applet that displays the version of Java currently installed.
* Depending on that version, it can display one or more short messages and/or jump to a different URL.
*
* <p>Parameters (<PARAM>):
* <ul>
* <li><code>version</code><i>n</i>
* <br>Minimum version required to pass inspection, e.g. 1.3.1</li>
* <li><code>message</code><i>n</i>
* <br>Message displayed upon passing inspection. (optional)</li>
* <li><code>url</code><i>n</i>
* <br>Web page loaded upon passing inspection. (optional)</li>
* <li><code>default</code>
* <br>Message displayed if none of the version conditions are met, evaluated in order (1 first, then 2, etc).</li>
* </ul>
*
* <p>Begun on Mon Jun 10 10:17:39 EDT 2002
* <br>Copyright (C) 2002 by Ian W. Davis. All rights reserved.
*/
public class JavaCheck extends Applet //... implements ...
{
//{{{ Variable definitions
//##################################################################################################
int level = 0;
//}}}
//{{{ init
//##################################################################################################
public void init()
{
setBackground(Color.white);
setLayout(new GridLayout(0,1));
String versionStr = System.getProperty("java.version", "1.0");
Label versionLbl = new Label("Your Java version is "+versionStr, Label.CENTER);
add(versionLbl);
String msg = getParameter("default");
if(msg == null) msg = "";
int i = 1;
String versionReq = getParameter("version"+i);
while(versionReq != null)
{
if(versionReq.compareTo(versionStr) <= 0)
{
msg = getParameter("message"+i);
if(msg == null) msg = "";
level = i;
break; // quit this loop
}
versionReq = getParameter("version"+(++i));
}
Label passfail = new Label(msg, Label.CENTER);
add(passfail);
// Look for a web page to jump to...
String urlStr = getParameter("url"+i);
if(urlStr != null)
{
try {
URL url = new URL(this.getDocumentBase(), urlStr);
this.getAppletContext().showDocument(url);
} catch(MalformedURLException ex) {}
}
}
//}}}
//{{{ getLevel()
//##################################################################################################
public int getLevel() { return level; }
//}}}
//{{{ Utility/debugging functions
//##################################################################################################
// Convenience functions for debugging
void echo(String s) { System.err.println(s); } // like Unix 'echo'
void echon(String s) { System.err.print(s); } // like Unix 'echo -n'
//}}}
}//class
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