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Copyright (C) 2014 Philip Helger ( philip[at]helger[dot]com Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
package com.helger.appbasics.auth.credentials;
public final class AuthCredentialValidatorManager
     = ServiceLoaderUtils.getAllSPIImplementations (IAuthCredentialValidatorSPI.class);
    if (.isEmpty ())
      throw new InitializationException ("No class implementing " + IAuthCredentialValidatorSPI.class + " was found!");
  public static CredentialValidationResult validateCredentials (@Nonnull final Locale aDisplayLocale,
                                                                @Nonnull final IAuthCredentials aCredentials)
    // Collect all strings of all supporting credential validators
    final List <StringaFailedMessages = new ArrayList <String> ();
    // Check all credential handlers if the can handle the passed credentials
    for (final IAuthCredentialValidatorSPI aHdl : )
      if (aHdl.supportsCredentials (aCredentials))
        final CredentialValidationResult aResult = aHdl.validateCredentials (aDisplayLocaleaCredentials);
        if (aResult == null)
          throw new IllegalStateException ("validateCredentials returned a null object from " + aHdl);
        if (aResult.isSuccess ())
          return aResult;
        aFailedMessages.add (aResult.getErrorMessage ());
    return new CredentialValidationResult (StringHelper.getImplodedNonEmpty ('\n'aFailedMessages));
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