/*
 * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
 *
 * 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 org.gradoop.flink.model.impl.operators.matching.single.cypher.operators.add.functions;

import org.apache.flink.api.common.functions.RichMapFunction;
import org.gradoop.common.model.impl.id.GradoopId;
import org.gradoop.flink.model.impl.operators.matching.single.cypher.pojos.Embedding;

/**
 * Adds {@link Embedding} columns based on a given set of variables.
 */
public class AddEmbeddingElements extends RichMapFunction<Embedding, Embedding> {
  /**
   * Return pattern variables that do not exist in pattern matching query
   */
  private final int count;

  /**
   * Creates a new function
   *
   * @param count number of elements to add
   */
  public AddEmbeddingElements(int count) {
    this.count = count;
  }

  @Override
  public Embedding map(Embedding embedding) {
    for (int i = 0; i < count; i++) {
      GradoopId id = GradoopId.get();
      embedding.add(id);
    }
    return embedding;
  }
}
