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.cql3;
  
  import com.google.common.base.MoreObjects;
  import com.google.common.base.Objects;
  
  import org.apache.cassandra.db.marshal.AbstractType;
  import org.apache.cassandra.db.marshal.ReversedType;
  
  import java.util.Collection;
  import java.util.Iterator;
  
  public class ColumnSpecification
  {
      public final String ksName;
      public final String cfName;
      public final ColumnIdentifier name;
      public final AbstractType<?> type;
  
      public ColumnSpecification(String ksName, String cfName, ColumnIdentifier name, AbstractType<?> type)
      {
          this.ksName = ksName;
          this.cfName = cfName;
          this.name = name;
          this.type = type;
      }
  
      /**
       * Returns a new <code>ColumnSpecification</code> for the same column but with the specified alias.
       *
       * @param alias the column alias
       * @return a new <code>ColumnSpecification</code> for the same column but with the specified alias.
       */
      public ColumnSpecification withAlias(ColumnIdentifier alias)
      {
          return new ColumnSpecification(ksName, cfName, alias, type);
      }
  
      public boolean isReversedType()
      {
          return type instanceof ReversedType;
      }
  
      /**
       * Returns true if all ColumnSpecifications are in the same table, false otherwise.
       */
      public static boolean allInSameTable(Collection<ColumnSpecification> names)
      {
          if (names == null || names.isEmpty())
              return false;
  
          Iterator<ColumnSpecification> iter = names.iterator();
          ColumnSpecification first = iter.next();
          while (iter.hasNext())
          {
              ColumnSpecification name = iter.next();
              if (!name.ksName.equals(first.ksName) || !name.cfName.equals(first.cfName))
                  return false;
          }
          return true;
      }
  
      @Override
      public boolean equals(Object other)
      {
          if (!(other instanceof ColumnSpecification))
              return false;
  
          ColumnSpecification that = (ColumnSpecification) other;
          return this.ksName.equals(that.ksName) &&
                 this.cfName.equals(that.cfName) &&
                 this.name.equals(that.name) &&
                 this.type.equals(that.type);
      }
  
      public int hashCode()
      {
          return Objects.hashCode(ksName, cfName, name, type);
      }
  
      @Override
      public String toString()
      {
          return MoreObjects.toStringHelper(this)
                            .add("name", name)
                            .add("type", type)
                            .toString();
      }
  }
  