ru.org.linux.section.SectionDao.java Source code

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Here is the source code for ru.org.linux.section.SectionDao.java

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/*
 * Copyright 1998-2010 Linux.org.ru
 *    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 ru.org.linux.section;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;
import org.springframework.stereotype.Component;

import javax.sql.DataSource;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

@Component
public class SectionDao {
    private final ImmutableMap<Integer, Section> sections;
    private final ImmutableList<Section> sectionsList;
    private final JdbcTemplate jdbcTemplate;

    @Autowired
    public SectionDao(DataSource ds) {
        jdbcTemplate = new JdbcTemplate(ds);

        final ImmutableMap.Builder<Integer, Section> sections = ImmutableMap.builder();
        final ImmutableList.Builder<Section> sectionsList = ImmutableList.builder();

        jdbcTemplate.query("SELECT id, name, imagepost, vote, moderate FROM sections ORDER BY id",
                new RowCallbackHandler() {
                    @Override
                    public void processRow(ResultSet rs) throws SQLException {
                        Section section = new Section(rs);

                        sections.put(section.getId(), section);
                        sectionsList.add(section);
                    }
                });

        this.sections = sections.build();
        this.sectionsList = sectionsList.build();
    }

    /**
     *   ?   ?.
     *
     * @param id  ?
     * @return  ?
     * @throws SectionNotFoundException ? ??  
     */
    public Section getSection(int id) throws SectionNotFoundException {
        Section section = sections.get(id);

        if (section == null) {
            throw new SectionNotFoundException(id);
        }

        return section;
    }

    /**
     *  ?? ?.
     *
     * @return ?? ?
     */
    public ImmutableList<Section> getSectionsList() {
        return sectionsList;
    }

    /**
     *  ?   ?   ?.
     *
     * @param id  ?
     * @return ?? ?  ?
     */
    public String getAddInfo(int id) {
        List<String> infos = jdbcTemplate.queryForList("select add_info from sections where id=?", String.class,
                id);

        if (infos.isEmpty()) {
            return null;
        } else {
            return infos.get(0);
        }
    }
}