content: /*
   * Tencent is pleased to support the open source community by making Angel available.
   *
   * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
   *
   * 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
   *
   * https://opensource.org/licenses/Apache-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.tencent.angel.graph.client.node2vec.getfuncs.getmindegree;
  
  import com.tencent.angel.ml.matrix.psf.get.base.GetFunc;
  import com.tencent.angel.ml.matrix.psf.get.base.GetParam;
  import com.tencent.angel.ml.matrix.psf.get.base.GetResult;
  import com.tencent.angel.ml.matrix.psf.get.base.PartitionGetParam;
  import com.tencent.angel.ml.matrix.psf.get.base.PartitionGetResult;
  import com.tencent.angel.ps.storage.vector.ServerLongAnyRow;
  import com.tencent.angel.ps.storage.vector.element.IElement;
  import com.tencent.angel.ps.storage.vector.element.LongArrayElement;
  import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
  import it.unimi.dsi.fastutil.objects.ObjectIterator;
  import java.util.List;
  
  public class PullMinDegree extends GetFunc {
  
    /**
     * Create a new DefaultGetFunc.
     *
     * @param param parameter of get udf
     */
    public PullMinDegree(GetParam param) {
      super(param);
    }
  
    public PullMinDegree() {
      super(null);
    }
  
    @Override
    public PartitionGetResult partitionGet(PartitionGetParam partParam) {
      ServerLongAnyRow row = (ServerLongAnyRow) psContext.getMatrixStorageManager()
          .getRow(partParam.getPartKey(), 0);
  
      int partResult = Integer.MAX_VALUE;
      ObjectIterator<Long2ObjectMap.Entry<IElement>> iter = row.iterator();
      while (iter.hasNext()) {
        Long2ObjectMap.Entry<IElement> entry = iter.next();
        LongArrayElement value = (LongArrayElement) entry.getValue();
        int length = value.getData().length;
  
        if (length < partResult) {
          partResult = length;
        }
      }
  
      return new PullMinDegreePartitionResult(partResult);
    }
  
    @Override
    public GetResult merge(List<PartitionGetResult> partResults) {
      int result = Integer.MAX_VALUE;
  
      for (PartitionGetResult partResult : partResults) {
        int part = ((PullMinDegreePartitionResult) partResult).getPartResult();
        if (part < result) {
          result = part;
        }
      }
  
      return new PullMinDegreeResult(result);
    }
  }
  