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

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Here is the source code for com.attribyte.essem.es.TermsAggregation.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 java.io.IOException;
import java.util.List;

/**
 * Creates one bucket per term.
 *
 * See: <a href="http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html">Terms Aggregation</a>
 */
public class TermsAggregation implements BucketAggregation {

    public TermsAggregation(final String name, final String field, final int size, final Order order) {
        this.name = name;
        this.field = field;
        this.size = size;
        this.subs = null;
        this.order = order;
    }

    public TermsAggregation(final String name, final String field, final int size, final Order order,
            final List<Aggregation> subs) {
        this.name = name;
        this.field = field;
        this.size = size;
        this.order = order;
        this.subs = subs != null ? ImmutableList.copyOf(subs) : null;
    }

    public TermsAggregation(final String name, final String field, final int size) {
        this.name = name;
        this.field = field;
        this.size = size;
        this.subs = null;
        this.order = Order.DOC_COUNT_DESC;
    }

    public TermsAggregation(final String name, final String field, final int size, final List<Aggregation> subs) {
        this.name = name;
        this.field = field;
        this.size = size;
        this.order = Order.DOC_COUNT_DESC;
        this.subs = subs != null ? ImmutableList.copyOf(subs) : null;
    }

    @Override
    public void generate(final JsonGenerator generator) throws IOException {
        generator.writeObjectFieldStart(name);
        {
            generator.writeObjectFieldStart("terms");
            {
                generator.writeStringField("field", field);
                generator.writeNumberField("size", size);
                switch (order) { //Doc count descending is default...
                case DOC_COUNT_ASC:
                    generator.writeObjectFieldStart("order");
                    generator.writeStringField("_count", "asc");
                    generator.writeEndObject();
                    break;
                case TERM_ASC:
                    generator.writeObjectFieldStart("order");
                    generator.writeStringField("_term", "asc");
                    generator.writeEndObject();
                    break;
                case TERM_DESC:
                    generator.writeObjectFieldStart("order");
                    generator.writeStringField("_term", "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 int size;
    public final ImmutableList<Aggregation> subs;
    public final Order order;

}