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.carbondata.index.examples;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.lang3.StringUtils;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.log4j.Logger;
  
  import org.apache.carbondata.common.logging.LogServiceFactory;
  import org.apache.carbondata.core.datastore.block.SegmentProperties;
  import org.apache.carbondata.core.features.TableOperation;
  import org.apache.carbondata.core.index.IndexDistributable;
  import org.apache.carbondata.core.index.IndexMeta;
  import org.apache.carbondata.core.index.Segment;
  import org.apache.carbondata.core.index.dev.IndexBuilder;
  import org.apache.carbondata.core.index.dev.IndexModel;
  import org.apache.carbondata.core.index.dev.IndexWriter;
  import org.apache.carbondata.core.index.dev.cgindex.CoarseGrainIndex;
  import org.apache.carbondata.core.index.dev.cgindex.CoarseGrainIndexFactory;
  import org.apache.carbondata.core.memory.MemoryException;
  import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
  import org.apache.carbondata.core.metadata.schema.table.CarbonTable;
  import org.apache.carbondata.core.metadata.schema.table.IndexSchema;
  import org.apache.carbondata.core.metadata.schema.table.column.CarbonColumn;
  import org.apache.carbondata.core.scan.filter.intf.ExpressionType;
  import org.apache.carbondata.core.util.path.CarbonTablePath;
  import org.apache.carbondata.events.Event;
  
  /**
   * Min Max Index Factory
   */
  public class MinMaxIndexIndexFactory extends CoarseGrainIndexFactory {
    private static final Logger LOGGER = LogServiceFactory.getLogService(
        MinMaxIndexIndexFactory.class.getName());
    private IndexMeta indexMeta;
    private String indexName;
    private AbsoluteTableIdentifier identifier;
  
    public MinMaxIndexIndexFactory(CarbonTable carbonTable, IndexSchema indexSchema) {
      super(carbonTable, indexSchema);
  
      // this is an example for indexSchema, we can choose the columns and operations that
      // will be supported by this indexSchema. Furthermore, we can add cache-support for this indexSchema.
  
      // columns that will be indexed
      List<CarbonColumn> allColumns = getCarbonTable().getCreateOrderColumn();
  
      // operations that will be supported on the indexed columns
      List<ExpressionType> optOperations = new ArrayList<>();
      optOperations.add(ExpressionType.EQUALS);
      optOperations.add(ExpressionType.GREATERTHAN);
      optOperations.add(ExpressionType.GREATERTHAN_EQUALTO);
      optOperations.add(ExpressionType.LESSTHAN);
      optOperations.add(ExpressionType.LESSTHAN_EQUALTO);
      optOperations.add(ExpressionType.NOT_EQUALS);
      LOGGER.error("support operations: " + StringUtils.join(optOperations, ", "));
      this.indexMeta = new IndexMeta(allColumns, optOperations);
    }
  
    /**
     * createWriter will return the MinMaxDataWriter.
     *
     * @param segment
     * @param shardName
     * @return
     */
    @Override
    public IndexWriter createWriter(Segment segment, String shardName,
        SegmentProperties segmentProperties) {
      return new MinMaxDataWriter(getCarbonTable(), getIndexSchema(), segment, shardName,
          indexMeta.getIndexedColumns());
    }
  
    @Override
    public IndexBuilder createBuilder(Segment segment, String shardName,
        SegmentProperties segmentProperties) throws IOException {
      return null;
    }
  
    /**
     * getSecondaryIndexes Factory method Initializes the Min Max Index and returns.
     *
     * @param segment
     * @return
     * @throws IOException
     */
    @Override
    public List<MinMaxIndex> getIndexes(Segment segment)
        throws IOException {
      List<MinMaxIndex> indexes = new ArrayList<>();
      // Form a MinMaxIndex.
      MinMaxIndex index = new MinMaxIndex();
      try {
        index.init(new IndexModel(
            MinMaxDataWriter.genIndexStorePath(
                CarbonTablePath.getSegmentPath(
                    identifier.getTablePath(), segment.getSegmentNo()), indexName), new Configuration(false)));
      } catch (MemoryException ex) {
        throw new IOException(ex);
      }
      indexes.add(index);
      return indexes;
    }
  
    /**
     * @param segment
     * @return
     */
    @Override
    public List<IndexDistributable> toDistributable(Segment segment) {
      return null;
    }
  
    /**
     * Clear the Index.
     *
     * @param segment
     */
    @Override
    public void clear(String segmentNo) {
    }
  
    /**
     * Clearing the index.
     */
    @Override
    public void clear() {
    }
  
    @Override
    public List<CoarseGrainIndex> getIndexes(IndexDistributable distributable)
        throws IOException {
      return getIndexes(distributable.getSegment());
    }
  
    @Override
    public void fireEvent(Event event) {
  
    }
  
    @Override
    public IndexMeta getMeta() {
      return this.indexMeta;
    }
  
    @Override
    public void deleteIndexData(Segment segment) throws IOException {
  
    }
  
    @Override
    public void deleteIndexData() {
  
    }
  
    @Override
    public boolean willBecomeStale(TableOperation operation) {
      return false;
    }
  }