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/**
 * Copyright 2015 Smoke Turner, LLC.
 *
 * 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.smoketurner.notification.application.riak;

import javax.annotation.Nonnull;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.basho.riak.client.api.commands.kv.UpdateValue;
import com.google.common.base.Preconditions;

public class CursorUpdate extends UpdateValue.Update {

  private static final Logger LOGGER = LoggerFactory.getLogger(CursorUpdate.class);
  private final String key;
  private final long value;

  /**
   * Constructor
   * 
   * @param key
   * @param value
   */
  public CursorUpdate(@Nonnull final String key, final long value) {
    this.key = Preconditions.checkNotNull(key);
    this.value = value;
  }

  @Override
  public CursorObject apply(CursorObject original) {
    if (original == null) {
      LOGGER.debug("original is null, creating new cursor");
      original = new CursorObject(key, value);
    }
    original.setValue(value);
    return original;
  }
}