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.operation.Operation;
  import com.alibaba.graphscope.groot.operation.ddl.AddEdgeKindOperation;
  import com.alibaba.graphscope.proto.groot.EdgeKindPb;
  import com.google.protobuf.ByteString;
  import com.google.protobuf.InvalidProtocolBufferException;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class AddEdgeKindExecutor extends AbstractDdlExecutor {
  
      @Override
      public DdlResult execute(ByteString ddlBlob, GraphDef graphDef, int partitionCount)
              throws InvalidProtocolBufferException {
          EdgeKindPb edgeKindPb = EdgeKindPb.parseFrom(ddlBlob);
          EdgeKind edgeKind = EdgeKind.parseProto(edgeKindPb);
          long version = graphDef.getSchemaVersion();
  
          EdgeKind.Builder edgeKindBuilder = EdgeKind.newBuilder(edgeKind);
          String edgeLabel = edgeKind.getEdgeLabel();
          LabelId edgeLabelId = graphDef.getLabelId(edgeLabel);
          if (edgeLabelId == null) {
              throw new DdlException(
                      "invalid edgeLabel [" + edgeLabel + "], schema version [" + version + "]");
          }
          edgeKindBuilder.setEdgeLabelId(edgeLabelId);
  
          String srcVertexLabel = edgeKind.getSrcVertexLabel();
          LabelId srcVertexLabelId = graphDef.getLabelId(srcVertexLabel);
          if (srcVertexLabelId == null) {
              throw new DdlException(
                      "invalid srcVertexLabel ["
                              + srcVertexLabel
                              + "], schema version ["
                              + version
                              + "]");
          }
          edgeKindBuilder.setSrcVertexLabelId(srcVertexLabelId);
  
          String dstVertexLabel = edgeKind.getDstVertexLabel();
          LabelId dstVertexLabelId = graphDef.getLabelId(dstVertexLabel);
          if (dstVertexLabelId == null) {
              throw new DdlException(
                      "invalid dstVertexLabel ["
                              + dstVertexLabel
                              + "], schema version ["
                              + version
                              + "]");
          }
          edgeKindBuilder.setDstVertexLabelId(dstVertexLabelId);
  
          EdgeKind newEdgeKind = edgeKindBuilder.build();
          if (graphDef.hasEdgeKind(newEdgeKind)) {
              throw new DdlException(
                      "edgeKind ["
                              + newEdgeKind
                              + "] already exists, schema version ["
                              + version
                              + "]");
          }
  
          GraphDef.Builder graphDefBuilder = GraphDef.newBuilder(graphDef);
          version++;
          graphDefBuilder.setVersion(version);
          graphDefBuilder.addEdgeKind(newEdgeKind);
          long tableIdx = graphDef.getTableIdx();
          tableIdx++;
          graphDefBuilder.putEdgeTableId(newEdgeKind, tableIdx);
          graphDefBuilder.setTableIdx(tableIdx);
          GraphDef newGraphDef = graphDefBuilder.build();
  
          List<Operation> operations = new ArrayList<>(partitionCount);
          for (int i = 0; i < partitionCount; i++) {
              operations.add(new AddEdgeKindOperation(i, version, newEdgeKind, tableIdx));
          }
          return new DdlResult(newGraphDef, operations);
      }
  }
  