/*
 * 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.phoenix.schema;

import org.apache.hadoop.conf.Configuration;
import org.apache.phoenix.query.QueryServices;
import org.apache.phoenix.query.QueryServicesOptions;

public class MetaDataSplitPolicy extends SplitOnLeadingVarCharColumnsPolicy {

  private boolean allowSystemCatalogToSplit() {
    Configuration conf = getConf();
    return isSystemCatalogSplittable(conf);
  }

  public static boolean isSystemCatalogSplittable(Configuration conf) {
    boolean allowSplittableSystemCatalogRollback =
      conf.getBoolean(QueryServices.ALLOW_SPLITTABLE_SYSTEM_CATALOG_ROLLBACK,
        QueryServicesOptions.DEFAULT_ALLOW_SPLITTABLE_SYSTEM_CATALOG_ROLLBACK);
    boolean allowSystemCatalogToSplit = conf.getBoolean(QueryServices.SYSTEM_CATALOG_SPLITTABLE,
      QueryServicesOptions.DEFAULT_SYSTEM_CATALOG_SPLITTABLE);
    return allowSystemCatalogToSplit && !allowSplittableSystemCatalogRollback;
  }

  // This only exists in HBase 2.4+
  @Override
  protected boolean canSplit() {
    return super.canSplit() && allowSystemCatalogToSplit();
  }

  @Override
  protected boolean shouldSplit() {
    return super.shouldSplit() && allowSystemCatalogToSplit();
  }

  @Override
  protected int getColumnToSplitAt() {
    // SYSTEM.CATALOG rowkey is (tenant id, schema name, table name, column name,
    // column family) ensure all meta data rows for a given schema are in the same
    // region (indexes and tables are in the same schema as we lock the parent table
    // when modifying an index)
    return 2;
  }

}
