/**
 * 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.hadoop.hdfs.util;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.util.UserNameChecker;
import org.apache.hadoop.util.ReflectionUtils;

/**
 * Class that helps validate usernames using the class specified by dfs.util
 * .username.checker.class in the configuration
 */
public class UserNameValidator {

  private final UserNameChecker nameChecker;

  public UserNameValidator(Configuration configuration) {
    Class<? extends UserNameChecker> nameCheckerClass = configuration.getClass(
        "dfs.util.username.checker.class", PosixUserNameChecker.class,
        UserNameChecker.class);
    nameChecker = (UserNameChecker) ReflectionUtils.newInstance(
        nameCheckerClass, configuration);
  }

  public boolean isValidName(String src) {
    return nameChecker.isValidUserName(src);
  }
}
