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.model.neighbor.dynamic.psf.get;
  
  import com.tencent.angel.graph.model.neighbor.dynamic.DynamicNeighborElement;
  import com.tencent.angel.ml.matrix.psf.get.base.GetFunc;
  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.matrix.ServerMatrix;
  import com.tencent.angel.ps.storage.partition.RowBasedPartition;
  import com.tencent.angel.ps.storage.vector.ServerLongAnyRow;
  import com.tencent.angel.ps.storage.vector.element.IElement;
  import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
  import it.unimi.dsi.fastutil.objects.ObjectIterator;
  
  import java.util.List;
  
  public class GetNodes extends GetFunc {
  
    public GetNodes(int matrixId, int psPartId) {
      this(new GetNodesParam(matrixId, psPartId));
    }
  
    public GetNodes(GetNodesParam param) {
      super(param);
    }
  
    public GetNodes() {
      this(null);
    }
  
    @Override
    public PartitionGetResult partitionGet(PartitionGetParam partParam) {
      ServerMatrix matrix = psContext.getMatrixStorageManager().getMatrix(partParam.getMatrixId());
      RowBasedPartition part = (RowBasedPartition) matrix.getPartition(partParam.getPartKey().getPartitionId());
      ServerLongAnyRow row = (ServerLongAnyRow) part.getRow(0);
      ObjectIterator<Long2ObjectMap.Entry<IElement>> it = row.getStorage().iterator();
  
      long[] nodes = new long[row.size()];
      int i = 0;
      while (it.hasNext()) {
        Long2ObjectMap.Entry<IElement> next = it.next();
        DynamicNeighborElement ele = (DynamicNeighborElement) next.getValue();
        if (ele != null) {
          nodes[i] = next.getLongKey();
          i += 1;
        }
      }
      return new PartGetNodesResult(nodes);
    }
  
    @Override
    public GetResult merge(List<PartitionGetResult> partResults) {
      int size = 0;
      for (PartitionGetResult result: partResults) {
        size += ((PartGetNodesResult) result).getNodes().length;
      }
      long[] re = new long[size];
      for (PartitionGetResult result : partResults) {
        long[] partResult = ((PartGetNodesResult) result).getNodes();
        System.arraycopy(partResult, 0, re, 0, partResult.length);
      }
      return new GetNodesResult(re);
    }
  }
  