org.wallride.repository.CommentRepositoryImpl.java Source code

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Here is the source code for org.wallride.repository.CommentRepositoryImpl.java

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/*
 * Copyright 2014 Tagbangers, Inc.
 *
 * 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 org.wallride.repository;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queryparser.classic.MultiFieldQueryParser;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.hibernate.Criteria;
import org.hibernate.FetchMode;
import org.hibernate.Session;
import org.hibernate.search.jpa.FullTextEntityManager;
import org.hibernate.search.jpa.FullTextQuery;
import org.hibernate.search.jpa.Search;
import org.hibernate.search.query.dsl.BooleanJunction;
import org.hibernate.search.query.dsl.QueryBuilder;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;
import org.springframework.util.StringUtils;
import org.wallride.domain.Comment;
import org.wallride.model.CommentSearchRequest;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;

import static org.springframework.data.domain.Sort.Direction;
import static org.springframework.data.domain.Sort.Order;

public class CommentRepositoryImpl implements CommentRepositoryCustom {

    @PersistenceContext
    private EntityManager entityManager;

    @Override
    public Page<Comment> search(CommentSearchRequest request, Pageable pageable) {
        FullTextEntityManager fullTextEntityManager = Search.getFullTextEntityManager(entityManager);
        QueryBuilder qb = fullTextEntityManager.getSearchFactory().buildQueryBuilder().forEntity(Comment.class)
                .get();

        @SuppressWarnings("rawtypes")
        BooleanJunction<BooleanJunction> junction = qb.bool();
        junction.must(qb.all().createQuery());

        if (StringUtils.hasText(request.getKeyword())) {
            Analyzer analyzer = fullTextEntityManager.getSearchFactory().getAnalyzer("synonyms");
            String[] fields = new String[] { "authorName", "content" };
            MultiFieldQueryParser parser = new MultiFieldQueryParser(fields, analyzer);
            parser.setDefaultOperator(QueryParser.Operator.AND);
            Query query = null;
            try {
                query = parser.parse(request.getKeyword());
            } catch (ParseException e1) {
                try {
                    query = parser.parse(QueryParser.escape(request.getKeyword()));
                } catch (ParseException e2) {
                    throw new RuntimeException(e2);
                }
            }
            junction.must(query);
        }

        if (StringUtils.hasText(request.getLanguage())) {
            junction.must(qb.keyword().onField("post.language").matching(request.getLanguage()).createQuery());
        }

        if (request.getPostId() != null) {
            junction.must(qb.keyword().onField("post.id").matching(request.getPostId()).createQuery());
        }

        if (request.getApproved() != null) {
            junction.must(qb.keyword().onField("approved").matching(request.getApproved()).createQuery());
        }

        Query searchQuery = junction.createQuery();

        Session session = (Session) entityManager.getDelegate();
        Criteria criteria = session.createCriteria(Comment.class).setFetchMode("post", FetchMode.JOIN)
                .setFetchMode("author", FetchMode.JOIN);

        Sort sort = null;
        if (pageable.getSort() != null) {
            if (pageable.getSort().getOrderFor("date") != null) {
                Order order = pageable.getSort().getOrderFor("date");
                sort = new Sort(
                        new SortField("sortDate", SortField.Type.STRING,
                                order.getDirection().equals(Direction.DESC)),
                        new SortField("sortId", SortField.Type.LONG, order.getDirection().equals(Direction.DESC)));
            }
        }

        if (sort == null) {
            sort = new Sort(new SortField("sortDate", SortField.Type.STRING),
                    new SortField("sortId", SortField.Type.LONG));
        }

        FullTextQuery persistenceQuery = fullTextEntityManager.createFullTextQuery(searchQuery, Comment.class)
                .setCriteriaQuery(criteria).setSort(sort);
        persistenceQuery.setFirstResult(pageable.getOffset());
        persistenceQuery.setMaxResults(pageable.getPageSize());

        int resultSize = persistenceQuery.getResultSize();

        @SuppressWarnings("unchecked")
        List<Comment> results = persistenceQuery.getResultList();
        return new PageImpl<>(results, pageable, resultSize);
    }
}