com.datatorrent.lib.streamquery.condition.HavingCondition Maven / Gradle / Ivy

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/**
 * 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 com.datatorrent.lib.streamquery.condition;

import java.util.ArrayList;
import java.util.Map;

import javax.validation.constraints.NotNull;

import com.datatorrent.lib.streamquery.function.FunctionIndex;

/**
 *  A base class for Group,Having operator with aggregate index constraint.&nsbsp; Subclasses should provide the
    implementation to check if aggregate is valid.
 * 
 * @displayName Having Condition
 * @category Stream Manipulators
 * @tags sql condition, index, group
 * @since 0.3.4
 */
public abstract class HavingCondition
{
  /**
   * Aggregate index to be validated.
   */
  protected FunctionIndex  aggregateIndex = null;

  /**
   * @param aggregateIndex Aggregate index to be validated.
   */
  public HavingCondition(FunctionIndex aggregateIndex)
  {
    this.aggregateIndex = aggregateIndex;
  }

  /**
   *  Check if aggregate is valid.
   */
  public abstract boolean isValidAggregate(@NotNull ArrayList> rows) throws Exception;
}