Implementing Java interfaces

Refer to the following example for the guidance on implementing the PasswordProvider.java interface:

/*******************************************************************************
 * Licensed Materials - Property of HCL
 * (c) Copyright HCL Technologies Ltd. 2022. All Rights Reserved.
 *
 * Note to U.S. Government Users Restricted Rights:
 * Use, duplication or disclosure restricted by GSA ADP Schedule
 * Contract with IBM Corp.
 *******************************************************************************/
package com.ghc.password.provider;

/**
 * Support for allowing users to provide configuration data which can be
 * resolved to an actual password at runtime.
 */
public interface PasswordProvider {

   /**
    * Create an instance of a UI implementation that can provide serialized
    * config which can then be resolved to a password at runtime.
    * 
    * @param listener
    *           that should be notified when a user makes changes to the UI
    *           content.
    * @return the UI implementation.
    */
   PasswordProviderGUI createGUI();

   /**
    * Given the serialized data that was persisted from the user interface,
    * resolve this into the actual password that should be used.
    * 
    * @param config
    *           serialized data from UI
    * @return the password corresponding to the config.
    */
   String resolvePassword(String config);

}

Refer to the following example for the guidance on implementing the PasswordProviderGUI.java interface:

/*******************************************************************************
 * Licensed Materials - Property of HCL
 * (c) Copyright HCL Technologies Ltd. 2022. All Rights Reserved.
 *
 * Note to U.S. Government Users Restricted Rights:
 * Use, duplication or disclosure restricted by GSA ADP Schedule
 * Contract with IBM Corp.
 *******************************************************************************/
package com.ghc.password.provider;

import javax.swing.JComponent;
import javax.swing.event.DocumentListener;

/**
 * Provision of UI allowing users to enter how a password can be obtained.
 */
public interface PasswordProviderGUI {

   /**
    * @return a UI component that users can supply input via.
    */
   JComponent getComponent();

   /**
    * Update the UI with previously saved data, note that this should not
    * trigger any document listeners.
    * 
    * @param config
    *           the previous data.
    */
   void setConfig(String config);

   /**
    * @return the UI contents as a serialized string.
    */
   String getConfig();

   /**
    * Add a document listner that should be notified if the serialised form
    * would change as a result of the user editing the value(s)
    * 
    * @param listener
    */
   void addDocumentListener(DocumentListener listener);

}

Refer to the following example for the guidance on implementing the PasswordProviderFactory.java interface:

/*******************************************************************************
 * Licensed Materials - Property of HCL
 * (c) Copyright HCL Technologies Ltd. 2022. All Rights Reserved.
 *
 * Note to U.S. Government Users Restricted Rights:
 * Use, duplication or disclosure restricted by GSA ADP Schedule
 * Contract with IBM Corp.
 *******************************************************************************/
package com.ghc.password.provider;

import com.ghc.tags.TagDataStore;

/**
 * Simple factory interface to bootstrap a password provider implementation.
 */
public interface PasswordProviderFactory {

   /**
    * Create a new instance of the provider
    * 
    * @param tds
    *           access to tags if required
    * @return the provider.
    */
   public PasswordProvider newInstance(TagDataStore tds);
}