package com.atlassian.asap.core.keys.privatekey;
   
   import com.atlassian.asap.api.exception.CannotRetrieveKeyException;
   import com.atlassian.asap.core.keys.KeyProvider;
   import com.atlassian.asap.core.validator.ValidatedKeyId;
   
   import java.security.PrivateKey;
   
   /**
   * A provider that provides no keys. Useful as a default provider if none of the other providers is adequate.
   */
  public class NullKeyProvider implements KeyProvider<PrivateKey> {
      public static final String URL_SCHEME = "null";
  
      @Override
      public PrivateKey getKey(ValidatedKeyId keyId) throws CannotRetrieveKeyException {
          throw new CannotRetrieveKeyException("Please configure a private key provider");
      }
  
      @Override
      public String toString() {
          return this.getClass().getSimpleName();
      }
  }