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.view;
  
  import java.util.Set;
  
  /**
   * Information passed to a read request.
   */
  public interface ReadRequest {
    /**
     * Get the requested property ids.
     *
     * @return the property ids
     */
    public Set<String> getPropertyIds();
  
    /**
     * Get the predicate.
     *
     * @return the predicate; may be null
     */
    public String getPredicate();
  
    /**
     * Get the temporal information for the given property id for this
     * request, if any.
     *
     * @param id the property id
     *
     * @return the temporal information for the given property id; null if
     *         none exists
     */
    public TemporalInfo getTemporalInfo(String id);
  
  
    /**
     * Temporal query data.
     */
    public interface TemporalInfo {
      /**
       * Get the start of the requested time range.  The time is given in
       * seconds since the Unix epoch.
       *
       * @return the start time in seconds
       */
      Long getStartTime();
  
      /**
       * Get the end of the requested time range.  The time is given in
       * seconds since the Unix epoch.
       *
       * @return the end time in seconds
       */
      Long getEndTime();
  
      /**
       * Get the requested time between each data point of the temporal
       * data.  The time is given in seconds.
       *
       * @return the step time in seconds
       */
      Long getStep();
    }
  }
  