User.java

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// Copyright 2013 Cloudera Inc.
//
// 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
//
// 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 com.cloudera.impala.authorization;

import com.google.common.base.Preconditions;

/*
 * Class that represents a User of an Impala session.
 */
public class User {
  private final String name_;

  public User(String name) {
    Preconditions.checkNotNull(name);
    this.name_ = name;
  }

  public String getName() { return name_; }

  /*
   * Get the short version of the user name (the user's name up to the first '/' or '@')
   * from the full principal name.
   * Similar to: org.apache.hadoop.security.UserGroupInformation.getShortName()
   */
  public String getShortName() {
    int idx = name_.indexOf('/');
    int idx2 = name_.indexOf('@');
    int endIdx = Math.min(idx, idx2);
    // At least one of them was not found.
    if (endIdx == -1) endIdx = Math.max(idx,  idx2);

    // If neither are found (or are found at the beginning of the user name),
    // return the username.
    return (endIdx <= 0) ? name_ : name_.substring(0, endIdx);
  }
}