package org.apache.archiva.metadata.repository.cassandra;
   
   /*
    * 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.
   */
  
  import me.prettyprint.cassandra.serializers.LongSerializer;
  import me.prettyprint.cassandra.serializers.SerializerTypeInferer;
  import me.prettyprint.cassandra.serializers.StringSerializer;
  import me.prettyprint.cassandra.service.template.ColumnFamilyUpdater;
  import me.prettyprint.hector.api.Serializer;
  import me.prettyprint.hector.api.beans.ColumnSlice;
  import me.prettyprint.hector.api.beans.HColumn;
  import me.prettyprint.hector.api.factory.HFactory;
  import me.prettyprint.hector.api.mutation.Mutator;
  
  import org.apache.archiva.metadata.repository.cassandra.model.ColumnNames;
  import org.apache.commons.lang.StringUtils;
  
  /**
   * @author Olivier Lamy
   * @since 2.0.0
   */
  public class CassandraUtils
  {
  
      private static final String EMPTY_VALUE = "";
  
      public static final String SEPARATOR = "->";
  
      public static String generateKey( final String... bases )
      {
          final StringBuilder builder = new StringBuilder();
          if ( bases == null || bases.length == 0 )
          {
              return builder.toString();
          }
  
          for ( final String s : bases )
          {
              if ( s != null )
              {
                  builder.append( s );
              }
              else
              {
                  builder.append( EMPTY_VALUE );
              }
              builder.append( SEPARATOR );
          }
          if ( builder.length() > 0 )
          {
              builder.setLength( builder.length() - SEPARATOR.length() );
          }
          return builder.toString();
      }
  
      public static <A, B> HColumn<A, B> column( final A name, final B value )
      {
  
          return HFactory.createColumn( name, //
                                        value, //
                                        (Serializer<A>) SerializerTypeInferer.getSerializer( name ), //
                                        (Serializer<B>) SerializerTypeInferer.getSerializer( value ) );
      }
  
      public static String getStringValue( ColumnSlice<String, String> columnSlice, ColumnNames columnName )
      {
          return getStringValue( columnSlice, columnName.toString() );
      }
  
      public static String getStringValue( ColumnSlice<String, String> columnSlice, String columnName )
      {
          if ( StringUtils.isEmpty( columnName ) )
          {
              return null;
          }
  
          HColumn<String, String> hColumn = columnSlice.getColumnByName( columnName );
          return hColumn == null ? null : hColumn.getValue();
      }
  
      public static Long getLongValue( ColumnSlice<String, ?> columnSlice, String columnName )
      {
         if ( StringUtils.isEmpty( columnName ) )
         {
             return null;
         }
 
         HColumn<String, Long> hColumn = (HColumn<String, Long>) columnSlice.getColumnByName( columnName );
         return hColumn == null ? null : hColumn.getValue();
     }
 
     public static <T> String getAsStringValue( ColumnSlice<String, T> columnSlice, String columnName )
     {
         StringSerializer ss = StringSerializer.get();
         if ( StringUtils.isEmpty( columnName ) )
         {
             return null;
         }
 
         HColumn<String, T> hColumn = columnSlice.getColumnByName( columnName );
         return hColumn == null ? null : ss.fromByteBuffer( hColumn.getValueBytes() );
     }
 
     public static Long getAsLongValue( ColumnSlice<String, String> columnSlice, String columnName )
     {
         LongSerializer ls = LongSerializer.get();
         if ( StringUtils.isEmpty( columnName ) )
         {
             return null;
         }
 
         HColumn<String, String> hColumn = columnSlice.getColumnByName( columnName );
         return hColumn == null ? null : ls.fromByteBuffer( hColumn.getValueBytes() );
     }
 
     public static void addInsertion( Mutator<String> mutator, String key, String columnFamily, String columnName,
                                      String value )
     {
         if ( value != null )
         {
             mutator.addInsertion( key, columnFamily, column( columnName, value ) );
         }
     }
 
     /**
      * null check on the value to prevent {@link java.lang.IllegalArgumentException}
      * @param updater
      * @param columnName
      * @param value
      */
     public static void addUpdateStringValue(ColumnFamilyUpdater<String,String> updater, String columnName, String value )
     {
         if (value == null)
         {
             return;
         }
         updater.setString( columnName, value );
 
     }
 
     private CassandraUtils()
     {
         // no-op
     }
 
 }