de.tudarmstadt.ukp.wikipedia.api.MetaData.java Source code

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Here is the source code for de.tudarmstadt.ukp.wikipedia.api.MetaData.java

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/*******************************************************************************
 * Copyright 2016
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universitt Darmstadt
 *
 * 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 de.tudarmstadt.ukp.wikipedia.api;

import org.hibernate.LockMode;
import org.hibernate.Session;

import de.tudarmstadt.ukp.wikipedia.api.WikiConstants;
import de.tudarmstadt.ukp.wikipedia.api.exception.WikiApiException;

/**
 * Provides access to meta data about a certain instance of Wikipedia.
 *
 *
 */
public class MetaData implements WikiConstants {
    // private MetaDataDAO metaDAO;
    private de.tudarmstadt.ukp.wikipedia.api.hibernate.MetaData hibernateMetaData;
    private Wikipedia wiki;

    /**
     * Creates a meta data object.
     */
    protected MetaData(Wikipedia wiki) {
        this.wiki = wiki;
        // this.metaDAO = new MetaDataDAO(wiki);
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        hibernateMetaData = (de.tudarmstadt.ukp.wikipedia.api.hibernate.MetaData) session
                .createQuery("from MetaData").uniqueResult();
        session.getTransaction().commit();
    };

    /**
     * Returns the id of the MetaData object.
     *
     * @return The id of the MetaData object.
     */
    public long getId() {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        long id = hibernateMetaData.getId();
        session.getTransaction().commit();
        return id;
    }

    /**
     * Returns the number of categories in the current Wikipedia.
     *
     * @return The number of categories in the current Wikipedia.
     */
    public long getNumberOfCategories() {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        long nrofCategories = hibernateMetaData.getNrofCategories();
        session.getTransaction().commit();
        return nrofCategories;
    }

    /**
     * Returns the number of pages in the current Wikipedia.
     *
     * @return The number of pages in the current Wikipedia.
     */
    public long getNumberOfPages() {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        long nrofPages = hibernateMetaData.getNrofPages();
        session.getTransaction().commit();
        return nrofPages;
    }

    /**
     * Returns the number of disambituation pages in the current Wikipedia.
     *
     * @return The number of disambituation pages in the current Wikipedia.
     */
    public long getNumberOfDisambiguationPages() {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        long nrofDisambPages = hibernateMetaData.getNrofDisambiguationPages();
        session.getTransaction().commit();
        return nrofDisambPages;
    }

    /**
     * Returns the number of redirects in the current Wikipedia.
     *
     * @return The number of redirects in the current Wikipedia.
     */
    public long getNumberOfRedirectPages() {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        long nrofRedirects = hibernateMetaData.getNrofRedirects();
        session.getTransaction().commit();
        return nrofRedirects;
    }

    /**
     * Returns the disambiguation category.
     *
     * @return The disambiguation category.
     * @throws WikiApiException
     */
    public Category getDisambiguationCategory() throws WikiApiException {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        String disambCategoryTitle = hibernateMetaData.getDisambiguationCategory();
        session.getTransaction().commit();
        Category disambCategory = wiki.getCategory(disambCategoryTitle);
        return disambCategory;
    }

    /**
     * Returns the name of the main/root category.
     *
     * @return The name of the main/root category.
     * @throws WikiApiException
     */
    public Category getMainCategory() throws WikiApiException {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        String mainCategoryTitle = hibernateMetaData.getMainCategory();
        session.getTransaction().commit();
        Category mainCategory = wiki.getCategory(mainCategoryTitle);
        return mainCategory;
    }

    /**
     * Returns the version of the wikipedia data.
     *
     * @return The version of the wikipedia data.
     * @throws WikiApiException
     */
    public String getVersion() throws WikiApiException {
        Session session = this.wiki.__getHibernateSession();
        session.beginTransaction();
        session.lock(hibernateMetaData, LockMode.NONE);
        String version = hibernateMetaData.getVersion();
        session.getTransaction().commit();
        return version;
    }

    /**
     * Returns the language of this wikipedia.
     *
     * @return The language of this wikipedia.
     */
    public Language getLanguage() {
        return wiki.getLanguage();
    }
}