library/src/main/java/org/apache/apex/malhar/lib/streamquery/condition/Condition.java

/**
 * 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.apex.malhar.lib.streamquery.condition;

import java.util.Map;

import javax.validation.constraints.NotNull;

/**
 * A base class for select condition for selecting or filtering the rows.  Subclasses should provide the
   implementation to filter valid rows and valid joins.
 * <p>
 * @displayName Condition
 * @category Stream Manipulators
 * @tags sql condition, filter
 * @since 0.3.3
 */
public abstract class Condition
{
  /**
   * Row containing column/value map.
   *
   * @return row validation status.
   */
  public abstract boolean isValidRow(@NotNull Map<String, Object> row);

  /**
   * Filter valid rows only.
   */
  public abstract boolean isValidJoin(@NotNull Map<String, Object> row1, Map<String, Object> row2);
}