/*

 * Copyright (c) 2009, 2010, 2011, 2012, B3log Team

 *

 * 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.b3log.solo.repository.impl;



import org.b3log.latke.Keys;

import org.b3log.latke.repository.*;

import org.b3log.solo.model.Article;

import org.b3log.solo.model.ArchiveDate;

import org.b3log.solo.repository.ArchiveDateArticleRepository;

import org.json.JSONArray;

import org.json.JSONObject;



/**

 * Archive date-Article relation repository.

 *

 * @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>

 * @version 1.0.0.6, Nov 9, 2011

 * @since 0.3.1

 */

public final class ArchiveDateArticleRepositoryImpl extends AbstractRepository implements ArchiveDateArticleRepository {



    /**

     * Singleton.

     */

    private static final ArchiveDateArticleRepositoryImpl SINGLETON =

            new ArchiveDateArticleRepositoryImpl(ArchiveDate.ARCHIVE_DATE + "_" + Article.ARTICLE);



    @Override

    public JSONObject getByArchiveDateId(final String archiveDateId, final int currentPageNum, final int pageSize)

            throws RepositoryException {

        final Query query = new Query().setFilter(new PropertyFilter(ArchiveDate.ARCHIVE_DATE + "_" + Keys.OBJECT_ID,

                                                                     FilterOperator.EQUAL, archiveDateId)).

                addSort(Article.ARTICLE + "_" + Keys.OBJECT_ID,

                        SortDirection.DESCENDING).

                setCurrentPageNum(currentPageNum).

                setPageSize(pageSize).

                setPageCount(1);



        return get(query);

    }



    @Override

    public JSONObject getByArticleId(final String articleId) throws RepositoryException {

        final Query query = new Query();

        query.setFilter(new PropertyFilter(Article.ARTICLE + "_" + Keys.OBJECT_ID, FilterOperator.EQUAL, articleId));



        final JSONObject result = get(query);

        final JSONArray array = result.optJSONArray(Keys.RESULTS);

        if (0 == array.length()) {

            return null;

        }



        return array.optJSONObject(0);

    }



    /**

     * Gets the {@link ArchiveDateArticleRepositoryImpl} singleton.

     *

     * @return the singleton

     */

    public static ArchiveDateArticleRepositoryImpl getInstance() {

        return SINGLETON;

    }



    /**

     * Private constructor.

     * 

     * @param name the specified name

     */

    private ArchiveDateArticleRepositoryImpl(final String name) {

        super(name);

    }

}