/*
    * 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.shardingsphere.sharding.rule.attribute;
  
  import com.cedarsoftware.util.CaseInsensitiveSet;
  import org.apache.shardingsphere.infra.datanode.DataNode;
  import org.apache.shardingsphere.infra.rule.attribute.table.TableMapperRuleAttribute;
  import org.apache.shardingsphere.sharding.rule.ShardingTable;
  
  import java.util.Collection;
  
  /**
   * Sharding table mapper rule attribute.
   */
  public final class ShardingTableNamesRuleAttribute implements TableMapperRuleAttribute {
      
      private final CaseInsensitiveSet<String> logicalTableNames;
      
      private final CaseInsensitiveSet<String> actualTableNames;
      
      public ShardingTableNamesRuleAttribute(final Collection<ShardingTable> shardingTables) {
          logicalTableNames = createLogicalTableNames(shardingTables);
          actualTableNames = createActualTableNames(shardingTables);
      }
      
      private CaseInsensitiveSet<String> createLogicalTableNames(final Collection<ShardingTable> shardingTables) {
          CaseInsensitiveSet<String> result = new CaseInsensitiveSet<>();
          shardingTables.forEach(each -> result.add(each.getLogicTable()));
          return result;
      }
      
      private CaseInsensitiveSet<String> createActualTableNames(final Collection<ShardingTable> shardingTables) {
          CaseInsensitiveSet<String> result = new CaseInsensitiveSet<>();
          shardingTables.stream().flatMap(each -> each.getActualDataNodes().stream()).map(DataNode::getTableName).forEach(result::add);
          return result;
      }
      
      @Override
      public Collection<String> getLogicTableNames() {
          return logicalTableNames;
      }
      
      @Override
      public Collection<String> getActualTableNames() {
          return actualTableNames;
      }
      
      @Override
      public Collection<String> getDistributedTableNames() {
          return logicalTableNames;
      }
      
      @Override
      public Collection<String> getEnhancedTableNames() {
          return logicalTableNames;
      }
  }