content: /*
   * Copyright 2021-2022 Alibaba Group Holding Ltd.
   *
   *    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
   *
   *      http://www.apache.org/licenses/LICENSE-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.aliyun.aliyun.transform.zen;
  
  import java.util.List;
  
  import com.aliyun.aliyun.transform.zen.converter.ZenNodeConverter;
  import com.aliyun.aliyun.transform.zen.converter.ZenNodeConverterFactory;
  import com.aliyun.aliyun.transform.zen.parser.ZenParser;
  import com.aliyun.aliyun.transform.zen.parser.ZenParserImpl;
  import com.aliyun.aliyun.transform.zen.parser.tree.BaseZenNode;
  import com.aliyun.fastmodel.core.tree.BaseStatement;
  import com.aliyun.fastmodel.core.tree.ListNode;
  import com.aliyun.fastmodel.core.tree.Node;
  import com.aliyun.fastmodel.core.tree.statement.table.ColumnDefinition;
  import com.aliyun.fastmodel.transform.api.Transformer;
  import com.aliyun.fastmodel.transform.api.builder.BuilderFactory;
  import com.aliyun.fastmodel.transform.api.builder.StatementBuilder;
  import com.aliyun.fastmodel.transform.api.context.ReverseContext;
  import com.aliyun.fastmodel.transform.api.context.TransformContext;
  import com.aliyun.fastmodel.transform.api.dialect.Dialect;
  import com.aliyun.fastmodel.transform.api.dialect.DialectMeta;
  import com.aliyun.fastmodel.transform.api.dialect.DialectName;
  import com.aliyun.fastmodel.transform.api.dialect.DialectNode;
  import com.aliyun.fastmodel.transform.api.dialect.IVersion;
  import com.google.auto.service.AutoService;
  
  /**
   * ZenTransformer
   *
   * @author panguanjing
   * @date 2021/8/16
   */
  @AutoService(Transformer.class)
  @Dialect(DialectName.Constants.ZEN)
  public class ZenTransformer implements Transformer<Node> {
  
      private static final ZenParser ZEN_PARSER = new ZenParserImpl();
  
      @Override
      public Node reverse(DialectNode dialectNode, ReverseContext context) {
          BaseZenNode baseZenNode = ZEN_PARSER.parseNode(dialectNode.getNode());
          ZenNodeConverter zenNodeConverter = ZenNodeConverterFactory.getInstance().create(ColumnDefinition.class);
          List<ColumnDefinition> convert = zenNodeConverter.convert(baseZenNode);
          return new ListNode(convert);
      }
  
      @Override
      public DialectNode transform(Node source, TransformContext context) {
          BaseStatement baseStatement = null;
          if (source instanceof BaseStatement) {
              baseStatement = (BaseStatement)source;
          }
          if (baseStatement == null) {
              throw new UnsupportedOperationException("unsupported source expect statement:" + source.getClass());
          }
          StatementBuilder builder = BuilderFactory.getInstance().getBuilder(baseStatement,
              new DialectMeta(DialectName.ZEN, IVersion.getDefault()), context);
          return builder.build(baseStatement, context);
      }
  }
  