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.psf.get.getnodes;
  
  import com.tencent.angel.graph.data.GraphNode;
  import com.tencent.angel.graph.utils.GraphMatrixUtils;
  import com.tencent.angel.ml.math2.VFactory;
  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.ml.matrix.psf.get.getrow.GetRowResult;
  import com.tencent.angel.ml.matrix.psf.get.indexed.IndexPartGetLongResult;
  import com.tencent.angel.ps.storage.vector.ServerLongAnyRow;
  import com.tencent.angel.ps.storage.vector.element.IElement;
  import com.tencent.angel.psagent.matrix.ResponseType;
  import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
  import it.unimi.dsi.fastutil.longs.Long2ObjectMap.Entry;
  import it.unimi.dsi.fastutil.longs.LongArrayList;
  import it.unimi.dsi.fastutil.objects.ObjectIterator;
  import java.util.List;
  
  public class GetNodes extends GetFunc {
  
    public GetNodes(int matrixId, int[] partitionIds) {
      this(new GetNodesParam(matrixId, partitionIds));
    }
  
    public GetNodes(GetNodesParam param) {
      super(param);
    }
  
    public GetNodes() {
      super(null);
    }
  
    @Override
    public PartitionGetResult partitionGet(PartitionGetParam param) {
      ServerLongAnyRow row = GraphMatrixUtils.getPSLongKeyRow(psContext, param);
  
      ObjectIterator<Entry<IElement>> it = row.iterator();
      LongArrayList nodes = new LongArrayList();
  
      Boolean isHash = ((PartGetNodesParam)param).getHash();
      long start = isHash ? 0 : param.getPartKey().getStartCol();
      while (it.hasNext()) {
        Long2ObjectMap.Entry entry = it.next();
        GraphNode node = (GraphNode) entry.getValue();
        if (node.getFeats() != null && node.getNeighbors() == null) {
          nodes.add(entry.getLongKey() + start);
        }
      }
  
      return new IndexPartGetLongResult(param.getPartKey(), nodes.toLongArray());
    }
  
    @Override
    public GetResult merge(List<PartitionGetResult> partResults) {
      int size = 0;
      for (PartitionGetResult result : partResults) {
        if (result instanceof IndexPartGetLongResult) {
          size += ((IndexPartGetLongResult) result).getValues().length;
        }
      }
  
      long[] values = new long[size];
      int start = 0;
      for (PartitionGetResult result : partResults) {
        if (result instanceof IndexPartGetLongResult) {
          long[] vals = ((IndexPartGetLongResult) result).getValues();
          System.arraycopy(vals, 0, values, start, vals.length);
          start += vals.length;
        }
      }
  
      return new GetRowResult(ResponseType.SUCCESS,
          VFactory.denseLongVector(values));
    }
  }
  