001/*
002 * (C) Copyright 2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Kevin Leturc
018 */
019package org.nuxeo.elasticsearch.core;
020
021import java.io.Serializable;
022import java.util.Arrays;
023import java.util.HashMap;
024import java.util.List;
025import java.util.Map;
026import java.util.stream.Collectors;
027
028import org.elasticsearch.search.SearchHit;
029import org.nuxeo.ecm.core.query.sql.NXQL;
030import org.nuxeo.ecm.core.schema.types.Type;
031import org.nuxeo.ecm.core.schema.types.primitives.DateType;
032
033/**
034 * Converter used to convert a {@link SearchHit} to a {@link Map}<{@link String}, {@link Serializable}>.
035 *
036 * @since 8.4
037 */
038public class EsSearchHitConverter {
039
040    private final Map<String, Type> selectFieldsAndTypes;
041
042    private final Map<String, Serializable> emptyRow;
043
044    public EsSearchHitConverter(Map<String, Type> selectFieldsAndTypes) {
045        this.selectFieldsAndTypes = selectFieldsAndTypes;
046        this.emptyRow = buildEmptyRow(selectFieldsAndTypes);
047    }
048
049    private static Map<String, Serializable> buildEmptyRow(Map<String, Type> selectFieldsAndTypes) {
050        Map<String, Serializable> emptyRow = new HashMap<>(selectFieldsAndTypes.size());
051        for (String fieldName : selectFieldsAndTypes.keySet()) {
052            emptyRow.put(fieldName, null);
053        }
054        return emptyRow;
055    }
056
057    public List<Map<String, Serializable>> convert(SearchHit... hits) {
058        return Arrays.stream(hits).map(this::convert).collect(Collectors.toList());
059    }
060
061    public Map<String, Serializable> convert(SearchHit hit) {
062        Map<String, Serializable> row = new HashMap<>(emptyRow);
063        hit.getSourceAsMap().forEach((name, value) -> {
064            // type conversion
065            if (value instanceof String) {
066                Type type = selectFieldsAndTypes.get(name);
067                if (type instanceof DateType) {
068                    // convert back to calendar
069                    value = type.decode(((String) value));
070                }
071            }
072            row.put(name, (Serializable) value);
073        });
074        if (selectFieldsAndTypes.containsKey(NXQL.ECM_FULLTEXT_SCORE)) {
075            row.put(NXQL.ECM_FULLTEXT_SCORE, (double) hit.getScore());
076        }
077        return row;
078    }
079
080}