PageContentService.java

package com.aperture_software.glados_wiki.services;

import com.aperture_software.glados_wiki.entities.Page;
import com.aperture_software.glados_wiki.entities.PageContent;
import com.google.common.base.Optional;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;
import org.bson.types.ObjectId;
import org.mongodb.morphia.Datastore;
import org.mongodb.morphia.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * User: jhyun
 * Date: 13. Nov. 16
 * Time: 11:07
 */
@Service
public class PageContentService {

    @Autowired
    private Datastore datastore;

    public Optional<PageContent> load(ObjectId id) {
        PageContent c = datastore.get(PageContent.class, id);
        return Optional.fromNullable(c);
    }

    public void save(PageContent pageContent) {
        datastore.save(pageContent);
    }

    public void delete(PageContent pageContent) {
        datastore.delete(pageContent);
    }

    public List<PageContent> listVersions(Page page, final int offset, final int limit) {
        Query<PageContent> q = datastore.createQuery(PageContent.class)
                .offset(offset).limit(limit)
                .order("-ctime");
        q.field("page").equal(page);
        return q.asList();
    }

    public long countVersions(Page page) {
        Query<PageContent> q = datastore.createQuery(PageContent.class);
        q.field("page").equal(page);
        return q.countAll();
    }

    public Pair<Long, List<PageContent>> listRecents(final int offset, final int limit) {
        Query<PageContent> q = datastore.createQuery(PageContent.class)
                .offset(offset).limit(limit)
                .order("-ctime");
        return new ImmutablePair<Long, List<PageContent>>(q.countAll(), q.asList());
    }

}