content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * 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 org.apache.ambari.server.security.credential;
  
  /**
   * CredentialFactory create Credential instances after determing what type of Credential is represented
   * by the value data.
   */
  public class CredentialFactory {
    /**
     * Give a credential value (assumed from a keystore), attempt to determine what type of Credential
     * is represented and create the appropriate Credential implementation.
     * <p/>
     * For example, if the raw value starts with "PrincipalKeyCredential" it is determined to be
     * a PrincipalKeyCredential.  A new PrincipalKeyCredential is created and then returned.
     *
     * @param value the raw credential value
     * @return a Credential
     * @throws InvalidCredentialValueException if an error occurs while parsing the raw credential value
     */
    public static Credential createCredential(char[] value) throws InvalidCredentialValueException {
  
      if (value == null) {
        return null;
      } else {
        String valueString = String.valueOf(value);
  
        if (PrincipalKeyCredential.isValidValue(valueString)) {
          return PrincipalKeyCredential.fromValue(valueString);
        } else {
          return GenericKeyCredential.fromValue(valueString);
        }
      }
    }
  }
  