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.db.virtual;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.ImmutableCollection;
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.Iterables;
  
  import org.apache.cassandra.schema.KeyspaceMetadata;
  import org.apache.cassandra.schema.Tables;
  
  public class VirtualKeyspace
  {
      private final String name;
      private final KeyspaceMetadata metadata;
  
      private final ImmutableCollection<VirtualTable> tables;
  
      public VirtualKeyspace(String name, Collection<VirtualTable> tables)
      {
          this.name = name;
          this.tables = ImmutableList.copyOf(tables);
  
          List<String> duplicates = tables.stream()
                                          .map(VirtualTable::name)
                                          .distinct()
                                          .filter(entry -> Collections.frequency(tables, entry) > 1)
                                          .collect(Collectors.toList());
  
          if (!duplicates.isEmpty())
              throw new IllegalArgumentException(String.format("Duplicate table names in virtual keyspace %s: %s", name, duplicates));
  
          this.metadata = KeyspaceMetadata.virtual(name, Tables.of(Iterables.transform(tables, VirtualTable::metadata)));
      }
  
      public String name()
      {
          return name;
      }
  
      public ImmutableCollection<VirtualTable> tables()
      {
          return tables;
      }
  
      public KeyspaceMetadata metadata()
      {
          return metadata;
      }
  }
  