content: /**
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * <p>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
   *
   * <p>http://www.apache.org/licenses/LICENSE-2.0
   *
   * <p>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.alibaba.graphscope.groot.schema.ddl;
  
  import com.alibaba.graphscope.groot.common.exception.DdlException;
  import com.alibaba.graphscope.groot.common.schema.wrapper.EdgeKind;
  import com.alibaba.graphscope.groot.common.schema.wrapper.GraphDef;
  import com.alibaba.graphscope.groot.common.schema.wrapper.LabelId;
  import com.alibaba.graphscope.groot.common.schema.wrapper.TypeDef;
  import com.alibaba.graphscope.groot.common.schema.wrapper.TypeEnum;
  import com.alibaba.graphscope.groot.common.util.DataLoadTarget;
  import com.alibaba.graphscope.groot.operation.Operation;
  import com.alibaba.graphscope.groot.operation.ddl.PrepareDataLoadOperation;
  import com.alibaba.graphscope.proto.groot.DataLoadTargetPb;
  import com.google.protobuf.ByteString;
  import com.google.protobuf.InvalidProtocolBufferException;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class PrepareDataLoadExecutor extends AbstractDdlExecutor {
      @Override
      public DdlResult execute(ByteString ddlBlob, GraphDef graphDef, int partitionCount)
              throws InvalidProtocolBufferException {
          DataLoadTargetPb dataLoadTargetPb = DataLoadTargetPb.parseFrom(ddlBlob);
          DataLoadTarget dataLoadTarget = DataLoadTarget.parseProto(dataLoadTargetPb);
          String label = dataLoadTarget.getLabel();
          String srcLabel = dataLoadTarget.getSrcLabel();
          String dstLabel = dataLoadTarget.getDstLabel();
  
          long version = graphDef.getSchemaVersion();
          if (!graphDef.hasLabel(label)) {
              throw new DdlException(
                      "label [" + label + "] not exists, schema version [" + version + "]");
          }
  
          GraphDef.Builder graphDefBuilder = GraphDef.newBuilder(graphDef);
          TypeDef typeDef = graphDef.getTypeDef(label);
          long tableIdx = graphDef.getTableIdx();
          tableIdx++;
          DataLoadTarget.Builder targetBuilder = DataLoadTarget.newBuilder(dataLoadTarget);
          if (srcLabel == null || srcLabel.isEmpty()) {
              // Vertex type
              if (typeDef.getTypeEnum() != TypeEnum.VERTEX) {
                  throw new DdlException(
                          "invalid data load target [" + dataLoadTarget + "], label is not a vertex");
              }
              graphDefBuilder.putVertexTableId(typeDef.getTypeLabelId(), tableIdx);
              targetBuilder.setLabelId(typeDef.getLabelId());
          } else {
              // Edge kind
              if (typeDef.getTypeEnum() != TypeEnum.EDGE) {
                  throw new DdlException(
                          "invalid data load target [" + dataLoadTarget + "], label is not an edge");
              }
              EdgeKind.Builder edgeKindBuilder = EdgeKind.newBuilder();
              LabelId edgeLabelId = graphDef.getLabelId(label);
              if (edgeLabelId == null) {
                  throw new DdlException(
                          "invalid edgeLabel [" + label + "], schema version [" + version + "]");
              }
              edgeKindBuilder.setEdgeLabelId(edgeLabelId);
              targetBuilder.setLabelId(edgeLabelId.getId());
              LabelId srcVertexLabelId = graphDef.getLabelId(srcLabel);
              if (srcVertexLabelId == null) {
                  throw new DdlException(
                          "invalid srcVertexLabel ["
                                  + srcLabel
                                  + "], schema version ["
                                  + version
                                  + "]");
              }
              edgeKindBuilder.setSrcVertexLabelId(srcVertexLabelId);
              targetBuilder.setSrcLabelId(srcVertexLabelId.getId());
              LabelId dstVertexLabelId = graphDef.getLabelId(dstLabel);
              if (dstVertexLabelId == null) {
                  throw new DdlException(
                          "invalid dstVertexLabel ["
                                  + dstLabel
                                  + "], schema version ["
                                  + version
                                  + "]");
              }
              edgeKindBuilder.setDstVertexLabelId(dstVertexLabelId);
              targetBuilder.setDstLabelId(dstVertexLabelId.getId());
              EdgeKind edgeKind = edgeKindBuilder.build();
              if (!graphDef.hasEdgeKind(edgeKind)) {
                  throw new DdlException(
                          "invalid data load target [" + dataLoadTarget + "], edgeKind not exists");
              }
              graphDefBuilder.putEdgeTableId(edgeKind, tableIdx);
          }
          version++;
          graphDefBuilder.setTableIdx(tableIdx);
          graphDefBuilder.setVersion(version);
          GraphDef newGraphDef = graphDefBuilder.build();
          List<Operation> operations = new ArrayList<>(partitionCount);
          for (int i = 0; i < partitionCount; i++) {
              operations.add(
                      new PrepareDataLoadOperation(i, version, targetBuilder.build(), tableIdx));
          }
          return new DdlResult(newGraphDef, operations);
      }
  }
  