content: /*
   * 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 org.apache.cassandra.sidecar.db.schema;
  
  import java.util.function.Predicate;
  
  import com.datastax.driver.core.Metadata;
  import com.datastax.driver.core.Session;
  import org.jetbrains.annotations.NotNull;
  
  /**
   * Schema for existing tables in Cassandra.
   */
  public abstract class CassandraSystemTableSchema extends TableSchema
  {
      @Override
      protected boolean exists(@NotNull Metadata metadata)
      {
          return true;
      }
  
      @Override
      protected boolean initializeInternal(@NotNull Session session,
                                           @NotNull Predicate<AbstractSchema> shouldCreateSchema)
      {
          prepareStatements(session);
          logger.info("{} Cassandra system table schema is initialized", this.getClass().getSimpleName());
          return true;
      }
  
      /**
       * Should not create new tables, since schema is for existing tables.
       */
      @Override
      protected String createSchemaStatement()
      {
          return null;
      }
  }
  