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.filter;
  
  import java.io.IOException;
  
  import org.apache.cassandra.schema.ColumnMetadata;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.db.*;
  import org.apache.cassandra.db.marshal.ReversedType;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  
  public abstract class AbstractClusteringIndexFilter implements ClusteringIndexFilter
  {
      static final Serializer serializer = new FilterSerializer();
  
      protected final boolean reversed;
  
      protected AbstractClusteringIndexFilter(boolean reversed)
      {
          this.reversed = reversed;
      }
  
      public boolean isReversed()
      {
          return reversed;
      }
  
      public boolean isEmpty(ClusteringComparator comparator)
      {
          return false;
      }
  
      protected abstract void serializeInternal(DataOutputPlus out, int version) throws IOException;
      protected abstract long serializedSizeInternal(int version);
  
      protected void appendOrderByToCQLString(TableMetadata metadata, StringBuilder sb)
      {
          if (reversed)
          {
              sb.append(" ORDER BY ");
              int i = 0;
              for (ColumnMetadata column : metadata.clusteringColumns())
              {
                  sb.append(i++ == 0 ? "" : ", ")
                    .append(column.name.toCQLString())
                    .append(column.type instanceof ReversedType ? " ASC" : " DESC");
              }
          }
      }
  
      private static class FilterSerializer implements Serializer
      {
          public void serialize(ClusteringIndexFilter pfilter, DataOutputPlus out, int version) throws IOException
          {
              AbstractClusteringIndexFilter filter = (AbstractClusteringIndexFilter)pfilter;
  
              out.writeByte(filter.kind().ordinal());
              out.writeBoolean(filter.isReversed());
  
              filter.serializeInternal(out, version);
          }
  
          public ClusteringIndexFilter deserialize(DataInputPlus in, int version, TableMetadata metadata) throws IOException
          {
              Kind kind = Kind.values()[in.readUnsignedByte()];
              boolean reversed = in.readBoolean();
  
              return kind.deserializer.deserialize(in, version, metadata, reversed);
          }
  
          public long serializedSize(ClusteringIndexFilter pfilter, int version)
          {
              AbstractClusteringIndexFilter filter = (AbstractClusteringIndexFilter)pfilter;
  
              return 1
                   + TypeSizes.sizeof(filter.isReversed())
                   + filter.serializedSizeInternal(version);
          }
      }
  }
  