SearchResult.java

package org.nlpcn.es4sql.domain;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHitField;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.filter.InternalFilter;
import org.elasticsearch.search.aggregations.bucket.terms.InternalTerms;
import org.elasticsearch.search.aggregations.bucket.terms.LongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms.Bucket;
import org.elasticsearch.search.aggregations.metrics.InternalNumericMetricsAggregation;
import org.elasticsearch.search.aggregations.metrics.tophits.InternalTopHits;
import org.elasticsearch.search.aggregations.metrics.valuecount.InternalValueCount;
import org.nlpcn.es4sql.exception.SqlParseException;

public class SearchResult {
	/**
	 * 查询结果
	 */
	private List<Map<String, Object>> results;

	private long total;

	double maxScore = 0;

	public SearchResult(SearchResponse resp) {
		SearchHits hits = resp.getHits();
		this.total = hits.getTotalHits();
		results = new ArrayList<>(hits.getHits().length);
		for (SearchHit searchHit : hits.getHits()) {
			if (searchHit.getSource() != null) {
				results.add(searchHit.getSource());
			} else if (searchHit.getFields() != null) {
				Map<String, SearchHitField> fields = searchHit.getFields();
				results.add(toFieldsMap(fields));
			}

		}
	}

	public SearchResult(SearchResponse resp, Select select) throws SqlParseException {
		Aggregations aggs = resp.getAggregations();
		if (aggs.get("filter") != null) {
			InternalFilter inf = aggs.get("filter");
			aggs = inf.getAggregations();
		}
		if (aggs.get("group by") != null) {
			InternalTerms terms = aggs.get("group by");
			Collection<Bucket> buckets = terms.getBuckets();
			this.total = buckets.size();
			results = new ArrayList<>(buckets.size());
			for (Bucket bucket : buckets) {
				Map<String, Object> aggsMap = toAggsMap(bucket.getAggregations().getAsMap());
				aggsMap.put("docCount", bucket.getDocCount());
				results.add(aggsMap);
			}
		} else {
			results = new ArrayList<>(1);
			this.total = 1;
			Map<String, Object> map = new HashMap<>();
			for (Aggregation aggregation : aggs) {
				map.put(aggregation.getName(), covenValue(aggregation));
			}
			results.add(map);
		}

	}

	/**
	 * 讲es的field域转换为你Object
	 * 
	 * @param fields
	 * @return
	 */
	private Map<String, Object> toFieldsMap(Map<String, SearchHitField> fields) {
		Map<String, Object> result = new HashMap<>();
		for (Entry<String, SearchHitField> entry : fields.entrySet()) {
			if (entry.getValue().values().size() > 1) {
				result.put(entry.getKey(), entry.getValue().values());
			} else {
				result.put(entry.getKey(), entry.getValue().value());
			}

		}
		return result;
	}

	/**
	 * 讲es的field域转换为你Object
	 * 
	 * @param fields
	 * @return
	 * @throws SqlParseException
	 */
	private Map<String, Object> toAggsMap(Map<String, Aggregation> fields) throws SqlParseException {
		Map<String, Object> result = new HashMap<>();
		for (Entry<String, Aggregation> entry : fields.entrySet()) {
			result.put(entry.getKey(), covenValue(entry.getValue()));
		}
		return result;
	}

	private Object covenValue(Aggregation value) throws SqlParseException {
		if (value instanceof InternalNumericMetricsAggregation.SingleValue) {
			return ((InternalNumericMetricsAggregation.SingleValue) value).value();
		} else if (value instanceof InternalValueCount) {
			return ((InternalValueCount) value).getValue();
		} else if (value instanceof InternalTopHits) {
			return (value);
		} else if (value instanceof LongTerms) {
			return value;
		} else {
			throw new SqlParseException("unknow this agg type " + value.getClass());
		}
	}

	public List<Map<String, Object>> getResults() {
		return results;
	}

	public void setResults(List<Map<String, Object>> results) {
		this.results = results;
	}

	public long getTotal() {
		return total;
	}

	public void setTotal(long total) {
		this.total = total;
	}

	public double getMaxScore() {
		return maxScore;
	}

	public void setMaxScore(double maxScore) {
		this.maxScore = maxScore;
	}

}