com.attribyte.essem.es.DateHistogramAggregation.java Source code

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Here is the source code for com.attribyte.essem.es.DateHistogramAggregation.java

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/*
 * Copyright 2014 Attribyte, LLC
 *
 * Licensed 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.attribyte.essem.es;

import com.fasterxml.jackson.core.JsonGenerator;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

import java.io.IOException;
import java.util.List;

public class DateHistogramAggregation extends QueryComponent implements BucketAggregation {

    public static enum Interval {
        YEAR("year"), QUARTER("quarter"), MONTH("month"), WEEK("week"), DAY("day"), HOUR("hour"), FIVE_MINUTE(
                "5m"), MINUTE("minute"), FIVE_SECOND("5s"), SECOND("second");

        private Interval(final String name) {
            this.name = name;
        }

        /**
         * Maps a string to an interval.
         */
        public static final ImmutableMap<String, Interval> intervalMap = ImmutableMap.<String, Interval>builder()
                .put("year", YEAR).put("quarter", QUARTER).put("month", MONTH).put("week", WEEK).put("day", DAY)
                .put("hour", HOUR).put("minute", MINUTE).put("5m", FIVE_MINUTE).put("5_minute", FIVE_MINUTE)
                .put("five_minute", FIVE_MINUTE).put("5s", FIVE_SECOND).put("5_second", FIVE_SECOND)
                .put("five_second", FIVE_SECOND).put("second", SECOND).build();

        public final String name;
    }

    /**
     * The 'histogram' type.
     */
    public static final String type = "date_histogram";

    public DateHistogramAggregation(final String name, final String field, final Interval interval,
            final Order order) {
        this.name = name;
        this.field = field;
        this.interval = interval.name;
        this.subs = ImmutableList.of();
        this.filter = null;
        this.order = order;
    }

    public DateHistogramAggregation(final String name, final String field, final Interval interval,
            final Order order, final List<Aggregation> subs) {
        this.name = name;
        this.field = field;
        this.interval = interval.name;
        this.subs = subs == null ? ImmutableList.<Aggregation>of() : ImmutableList.copyOf(subs);
        this.filter = null;
        this.order = order;
    }

    public DateHistogramAggregation(final String name, final String field, final Interval interval) {
        this.name = name;
        this.field = field;
        this.interval = interval.name;
        this.subs = ImmutableList.of();
        this.filter = null;
        this.order = Order.KEY_ASC;
    }

    public DateHistogramAggregation(final String name, final String field, final Interval interval,
            final List<Aggregation> subs) {
        this.name = name;
        this.field = field;
        this.interval = interval.name;
        this.subs = subs == null ? ImmutableList.<Aggregation>of() : ImmutableList.copyOf(subs);
        this.filter = null;
        this.order = Order.KEY_ASC;
    }

    @Override
    public void generate(final JsonGenerator generator) throws IOException {
        generator.writeObjectFieldStart(name);
        {
            if (filter != null) {
                generator.writeFieldName("filter");
                filter.generate(generator);
            }

            generator.writeObjectFieldStart(type);
            {
                generator.writeStringField("field", field);
                generator.writeStringField("interval", interval);
                generator.writeNumberField("min_doc_count", 0);

                switch (order) { //Key ascending is default...
                case DOC_COUNT_ASC:
                    generator.writeObjectFieldStart("order");
                    generator.writeStringField("_count", "asc");
                    generator.writeEndObject();
                    break;
                case DOC_COUNT_DESC:
                    generator.writeObjectFieldStart("order");
                    generator.writeStringField("_count", "desc");
                    generator.writeEndObject();
                    break;
                case KEY_DESC:
                    generator.writeObjectFieldStart("order");
                    generator.writeStringField("_key", "desc");
                    generator.writeEndObject();
                    break;
                }
            }
            generator.writeEndObject();
            if (subs != null && subs.size() > 0) {
                generator.writeObjectFieldStart(AGGREGATION_OBJECT_NAME);
                for (Aggregation sub : subs) {
                    sub.generate(generator);
                }
                generator.writeEndObject();
            }
        }
        generator.writeEndObject();
    }

    public final String name;
    public final String field;
    public final String interval;
    public final ImmutableList<Aggregation> subs;
    public final QueryComponent filter;
    public final Order order;

}