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Druid Aggregators based on datasketches lib http://datasketches.github.io/

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.query.aggregation.datasketches.quantiles;

import org.apache.commons.codec.binary.Base64;

import com.google.common.base.Charsets;
import com.yahoo.memory.Memory;
import com.yahoo.sketches.quantiles.DoublesSketch;

import io.druid.java.util.common.ISE;

public class DoublesSketchOperations
{

  public static final DoublesSketch EMPTY_SKETCH = DoublesSketch.builder().build();

  public static DoublesSketch deserialize(final Object serializedSketch)
  {
    if (serializedSketch instanceof String) {
      return deserializeFromBase64EncodedString((String) serializedSketch);
    } else if (serializedSketch instanceof byte[]) {
      return deserializeFromByteArray((byte[]) serializedSketch);
    } else if (serializedSketch instanceof DoublesSketch) {
      return (DoublesSketch) serializedSketch;
    }
    throw new ISE(
        "Object is not of a type that can be deserialized to a quantiles DoublsSketch: "
            + serializedSketch.getClass());
  }

  public static DoublesSketch deserializeFromBase64EncodedString(final String str)
  {
    return deserializeFromByteArray(Base64.decodeBase64(str.getBytes(Charsets.UTF_8)));
  }

  public static DoublesSketch deserializeFromByteArray(final byte[] data)
  {
    return DoublesSketch.wrap(Memory.wrap(data));
  }

}