com.hydraql.adapter.dsl.antlr.interpreter.DropVirtualTableExecutor Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of hydraql-template_1.4 Show documentation
The newest version!
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.hydraql.adapter.dsl.antlr.interpreter;

import com.hydraql.adapter.AbstractHBaseSqlAdapter;
import com.hydraql.common.exception.HBaseSqlAnalysisException;
import com.hydraql.common.model.HQLType;
import com.hydraql.common.util.StringUtil;
import com.hydraql.adapter.connection.HBaseConnectionUtil;
import com.hydraql.dsl.antlr.HydraQLParser;
import com.hydraql.adapter.dsl.antlr.visitor.TableNameVisitor;
import com.hydraql.dsl.context.HBaseSqlContext;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;

/**
 * @author leojie 2023/9/27 15:13
 */
public class DropVirtualTableExecutor extends BaseHqlExecutor implements Interpreter {
  private final AbstractHBaseSqlAdapter sqlAdapter;

  private DropVirtualTableExecutor(ExecutorBuilder builder) {
    super(builder.hql);
    this.sqlAdapter = builder.sqlAdapter;
  }

  @Override
  public Boolean execute() {
    this.checkParsedHqlTypeMatched(this.getHqlType());
    HydraQLParser.Drop_table_commandContext dropTableCommandContext =
        this.getSqlCommandContext().ddl_command().drop_table_command();

    String virtualTableName =
        new TableNameVisitor().extractTableName(dropTableCommandContext.table_ref());
    Get get = new Get(Bytes.toBytes(virtualTableName));
    boolean virtualTableExists = sqlAdapter
        .executeQuery(AbstractHBaseSqlAdapter.HQL_META_DATA_TABLE_NAME.getNameAsString(), table -> {
          Result result = table.get(get);
          if (result == null) {
            return false;
          }
          byte[] value = result.getValue(AbstractHBaseSqlAdapter.HQL_META_DATA_TABLE_FAMILY,
            AbstractHBaseSqlAdapter.HQL_META_DATA_TABLE_QUALIFIER);
          return value != null && StringUtil.isNotBlank(Bytes.toString(value));
        });
    HydraQLParser.If_existsContext ifExistsContext = dropTableCommandContext.if_exists();
    if (!virtualTableExists && ifExistsContext == null) {
      throw new HBaseSqlAnalysisException(
          String.format("The virtual table %s does not exist.", virtualTableName));
    }
    Delete delete = new Delete(Bytes.toBytes(virtualTableName));
    sqlAdapter.execSingleDelete(AbstractHBaseSqlAdapter.HQL_META_DATA_TABLE_NAME.getNameAsString(),
      delete);
    removeTableSchema(virtualTableName);
    return true;
  }

  @Override
  public HQLType expectHqlType() {
    return HQLType.DROP_VIRTUAL_TABLE;
  }

  private void removeTableSchema(String virtualTableName) {
    String uniqueKey =
        HBaseConnectionUtil.generateUniqueConnectionKey(sqlAdapter.getConfiguration());
    uniqueKey = uniqueKey + "#" + virtualTableName;
    HBaseSqlContext.getInstance().removeTableSchema(uniqueKey);
  }

  private static class ExecutorBuilder extends Builder {
    private final String hql;
    private final AbstractHBaseSqlAdapter sqlAdapter;

    private ExecutorBuilder(String hql, AbstractHBaseSqlAdapter sqlAdapter) {
      this.hql = hql;
      this.sqlAdapter = sqlAdapter;
    }

    @Override
    public DropVirtualTableExecutor build() {
      return new DropVirtualTableExecutor(this);
    }
  }

  public static DropVirtualTableExecutor of(String hql, AbstractHBaseSqlAdapter sqlAdapter) {
    return new DropVirtualTableExecutor.ExecutorBuilder(hql, sqlAdapter).build();
  }
}