Added new method that returns if password retrieval is supported.

git-svn-id: http://svn.igniterealtime.org/svn/repos/messenger/trunk@2771 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/messenger/ldap/LdapUserProvider.java

@@ -438,4 +438,8 @@ public class LdapUserProvider implements UserProvider {
     public boolean isReadOnly() {
         return true;
     }
+
+    public boolean supportsPasswordRetrieval() {
+        return false;
+    }
 }
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src/java/org/jivesoftware/messenger/user/DefaultUserProvider.java

 /**
- * $RCSfile$
+ * $RCSfile: DefaultUserProvider.java,v $
  * $Revision$
  * $Date$
  *
@@ -518,4 +518,8 @@ public class DefaultUserProvider implements UserProvider {
     public boolean isReadOnly() {
         return false;
     }
+
+    public boolean supportsPasswordRetrieval() {
+        return true;
+    }
 }
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src/java/org/jivesoftware/messenger/user/UserProvider.java

@@ -227,4 +227,14 @@ public interface UserProvider {
      * @return true if the user provider is read-only.
      */
     public boolean isReadOnly();
+
+    /**
+     * Returns true if this UserProvider is able to retrieve user passwords from
+     * the backend user store. If this operation is not supported then {@link #getPassword(String)}
+     * will throw an {@link UnsupportedOperationException} if invoked.
+     *
+     * @return true if this UserProvider is able to retrieve user passwords from the
+     *         backend user store.
+     */
+    public boolean supportsPasswordRetrieval();
 }
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