package com.meltmedia.jgroups.aws;
   
   import com.amazonaws.auth.AWSCredentialsProvider;
   import org.jgroups.logging.Log;
   import org.jgroups.logging.LogFactory;
   import org.jgroups.util.Util;
   
   public class CredentialsProviderFactory {
     private final Log log;
  
    public CredentialsProviderFactory() {
      this(LogFactory.getLog(AWS_PING.class));
    }
  
    public CredentialsProviderFactory(final Log log) {
      this.log = log;
    }
  
    /**
     * Loads a new instance of the credential provider, using the same class loading rules from org.jgroups.Util.loadClass(String, Class).
     * 
     * @param credentialProviderClass the class name of the AWSCredentialsProvider to load.
     * @return an instance of the credential provider
     * @throws ClassNotFoundException if the implementation could not be found.
     * @throws InstantiationException if the implementation does not have a no argument constructor.
     */
    public AWSCredentialsProvider createCredentialsProvider(final String credentialProviderClass) throws Exception {
      try {
        final Class<?> credsProviderClazz = Util.loadClass(credentialProviderClass, getClass());
        return (AWSCredentialsProvider) credsProviderClazz.newInstance();
      } catch (ClassNotFoundException e) {
        throw new Exception("unable to load credentials provider class " + credentialProviderClass);
      } catch (InstantiationException e) {
        log.error("an instance of " + credentialProviderClass + " could not be created. Please check that it implements" +
            " interface AWSCredentialsProvider and that is has a public empty constructor !");
        throw e;
      }
    }
  }