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org.mortbay.jaas.callback
Class DefaultCallbackHandler  

java.lang.Object
  org.mortbay.jaas.callback.AbstractCallbackHandler
      org.mortbay.jaas.callback.DefaultCallbackHandler

All Implemented Interfaces:

javax.security.auth.callback.CallbackHandler

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public class DefaultCallbackHandler

extends AbstractCallbackHandler

DefaultUsernameCredentialCallbackHandler

Notes

Usage

Field Summary


 


Fields inherited from class org.mortbay.jaas.callback.AbstractCallbackHandler


_credential, _userName


 






Constructor Summary


DefaultCallbackHandler()



           


 






Method Summary



 void
handle(javax.security.auth.callback.Callback[] callbacks)



          Retrieve or display the information requested in the provided
 javax.security.auth.callback.Callbacks.


 


Methods inherited from class org.mortbay.jaas.callback.AbstractCallbackHandler


getCredential, getUserName, setCredential, setUserName


 


Methods inherited from class java.lang.Object


clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait


 











Constructor Detail




DefaultCallbackHandler
public DefaultCallbackHandler()









Method Detail




handle
public void handle(javax.security.auth.callback.Callback[] callbacks)
            throws java.io.IOException,
                   javax.security.auth.callback.UnsupportedCallbackException

Description copied from interface: javax.security.auth.callback.CallbackHandler
Retrieve or display the information requested in the provided
 javax.security.auth.callback.Callbacks.

 
The handle() method implementation checks the instance(s)
 of the javax.security.auth.callback.Callback object(s) passed in to retrieve or display the
 requested information. The following example is provided to help
 demonstrate what an handle() method implementation might look
 like. This example code is for guidance only. Many details, including
 proper error handling, are left out for simplicity.

 
public void handle(Callback[] callbacks)
throws IOException, UnsupportedCallbackException {
   for (int i = 0; i < callbacks.length; i++) {
      if (callbacks[i] instanceof TextOutputCallback) {
         // display the message according to the specified type
         TextOutputCallback toc = (TextOutputCallback)callbacks[i];
         switch (toc.getMessageType()) {
         case TextOutputCallback.INFORMATION:
            System.out.println(toc.getMessage());
            break;
         case TextOutputCallback.ERROR:
            System.out.println("ERROR: " + toc.getMessage());
            break;
         case TextOutputCallback.WARNING:
            System.out.println("WARNING: " + toc.getMessage());
            break;
         default:
            throw new IOException("Unsupported message type: "
                  + toc.getMessageType());
         }
      } else if (callbacks[i] instanceof NameCallback) {
         // prompt the user for a username
         NameCallback nc = (NameCallback)callbacks[i];
         // ignore the provided defaultName
         System.err.print(nc.getPrompt());
         System.err.flush();
         nc.setName((new BufferedReader(
               new InputStreamReader(System.in))).readLine());
      } else if (callbacks[i] instanceof PasswordCallback) {
         // prompt the user for sensitive information
         PasswordCallback pc = (PasswordCallback)callbacks[i];
         System.err.print(pc.getPrompt());
         System.err.flush();
         pc.setPassword(readPassword(System.in));
      } else {
         throw new UnsupportedCallbackException(
               callbacks[i], "Unrecognized Callback");
      }
   }
}

 // Reads user password from given input stream.
private char[] readPassword(InputStream in) throws IOException {
   // insert code to read a user password from the input stream
}
 


Specified by:
handle in interface javax.security.auth.callback.CallbackHandler
Overrides:
handle in class AbstractCallbackHandler














  

  
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