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A module that is everything required to understands Druid Segments

There is a newer version: 30.0.1

/*
 * 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.druid.data.input.impl;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.druid.segment.DimensionHandler;
import org.apache.druid.segment.StringDimensionHandler;
import org.apache.druid.segment.column.ColumnType;

import java.util.List;

/**
 * NOTE: 
 * This class should be deprecated after Druid supports configurable index types on dimensions.
 * When that exists, this should be the implementation: https://github.com/apache/druid/issues/2622
 * 
 * This is a stop-gap solution to consolidate the dimension specs and remove the separate spatial 
 * section in DimensionsSpec.
 */
public class NewSpatialDimensionSchema extends DimensionSchema
{
  private final List dims;

  @JsonCreator
  public NewSpatialDimensionSchema(
      @JsonProperty("name") String name,
      @JsonProperty("dims") List dims
  )
  {
    super(name, null, true);
    this.dims = dims;
  }

  @JsonProperty
  public List getDims()
  {
    return dims;
  }

  @Override
  public String getTypeName()
  {
    return DimensionSchema.SPATIAL_TYPE_NAME;
  }

  @Override
  @JsonIgnore
  public ColumnType getColumnType()
  {
    return ColumnType.STRING;
  }

  @Override
  public DimensionHandler getDimensionHandler()
  {
    return new StringDimensionHandler(getName(), getMultiValueHandling(), hasBitmapIndex(), true);
  }

  @Override
  public boolean equals(Object o)
  {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    NewSpatialDimensionSchema that = (NewSpatialDimensionSchema) o;

    return dims != null ? dims.equals(that.dims) : that.dims == null;

  }

  @Override
  public int hashCode()
  {
    return dims != null ? dims.hashCode() : 0;
  }
}