content: /*
   * Copyright (c) 2013 - 2014, Allen A. George <allen dot george at gmail dot com>
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *     * Neither the name of libraft nor the
   *       names of its contributors may be used to endorse or promote products
   *       derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package io.libraft.kayvee.store;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  /**
   * Thrown when a key specified in an operation
   * cannot be created because it already exists in
   * the key-value store.
   */
  public final class KeyAlreadyExistsException extends KayVeeException {
  
      private static final long serialVersionUID = 3068460555533291484L;
  
      private final String key;
  
      /**
       * Constructor.
       *
       * @param key non-null, non-empty key in a {@code key=>value} pair
       *            that already exists in the key-value store
       * @throws IllegalArgumentException if {@code key} is empty
       */
      public KeyAlreadyExistsException(String key) {
          super(String.format("key:%s - already exists", key));
  
          checkArgument(!key.isEmpty());
  
          this.key = key;
      }
  
      /**
       * Get the key in a {@code key=>value} pair
       * that caused this exception to be raised.
       *
       * @return non-null, non-empty key
       */
      public String getKey() {
          return key;
      }
  }
  