com.spotify.heroic.aggregation.simple.CountUnique.java Source code

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Here is the source code for com.spotify.heroic.aggregation.simple.CountUnique.java

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/*
 * Copyright (c) 2015 Spotify AB.
 *
 * 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 com.spotify.heroic.aggregation.simple;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.base.Optional;
import com.spotify.heroic.aggregation.AggregationContext;
import com.spotify.heroic.aggregation.SamplingQuery;

import lombok.Data;
import lombok.EqualsAndHashCode;

@Data
@EqualsAndHashCode(callSuper = true)
public class CountUnique extends SamplingAggregation {
    public static final String NAME = "count-unique";

    @JsonCreator
    public CountUnique(@JsonProperty("sampling") SamplingQuery sampling) {
        super(Optional.fromNullable(sampling).or(SamplingQuery::empty));
    }

    @Override
    public CountUniqueInstance apply(final AggregationContext context, final long size, final long extent) {
        return new CountUniqueInstance(size, extent);
    }

    @Override
    public String toDSL() {
        return samplingDSL(NAME);
    }
}