services.AbstractDBService Maven / Gradle / Ivy

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package services;

import factory.Neo4jSessionFactory;
import db.GraphEntity;
import io.reactivex.Observable;
import java.util.HashMap;
import org.neo4j.ogm.session.Session;
import utils.DatabaseUtils;

/**
 *
 * @author zua
 * @param  A graph entity subtype.
 */
public abstract class AbstractDBService implements DBService {

    public final int LIMIT = 30;

    @Override
    public final Observable findAll() {
        return Observable.fromIterable(getSession().loadAll(getClassType(), getSortOrderDesc(), LIMIT));
    }

    @Override
    public final Observable findAllAsc() {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, null, null, getSortOrderAsc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc() {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, null, null, getSortOrderDesc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllWithLimit(int limit) {
        return findAllDescWithLimit(limit);
    }

    @Override
    public final Observable findAllAscWithLimit(int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, null, null, getSortOrderAsc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDescWithLimit(int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, null, null, getSortOrderDesc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAll(String username) {
        return findAllDesc(username);
    }

    @Override
    public final Observable findAllAsc(String username) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, null, null, getSortOrderAsc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc(String username) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, null, null, getSortOrderDesc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAll(String username, int limit) {
        return findAllDesc(username, limit);
    }

    @Override
    public final Observable findAllAsc(String username, int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, null, null, getSortOrderAsc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc(String username, int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, null, null, getSortOrderDesc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAll(String property, Object value) {
        return findAllDesc(property, value);
    }

    @Override
    public final Observable findAllAsc(String property, Object value) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, property, value, getSortOrderAsc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc(String property, Object value) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, property, value, getSortOrderDesc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAll(String property, Object value, int limit) {
        return findAllDesc(property, value, limit);
    }

    @Override
    public final Observable findAllAsc(String property, Object value, int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, property, value, getSortOrderAsc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc(String property, Object value, int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), null, property, value, getSortOrderDesc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAll(String username, String property, Object value) {
        return findAllDesc(username, property, value);
    }

    @Override
    public final Observable findAllAsc(String username, String property, Object value) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, property, value, getSortOrderAsc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc(String username, String property, Object value) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, property, value, getSortOrderDesc(), LIMIT);
        return executeQuery(query);
    }

    @Override
    public final Observable findAll(String username, String property, Object value, int limit) {
        return findAllDesc(username, property, value, limit);
    }

    @Override
    public final Observable findAllAsc(String username, String property, Object value, int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, property, value, getSortOrderAsc(), limit);
        return executeQuery(query);
    }

    @Override
    public final Observable findAllDesc(String username, String property, Object value, int limit) {
        String query = Neo4jQueries.getFindAllQuery(getClassType(), username, property, value, getSortOrderDesc(), limit);
        return executeQuery(query);
    }

    @Override
    public final T find(String id) {
        try {
            Session session = Neo4jSessionFactory.getInstance().getNeo4jSession();
            return session.load(getClassType(), id, 2);
        } catch (Exception e) {
            return null;
        }
    }

    @Override
    public final T find(T object) {
        try {
            String classname = getClassType().getSimpleName();
            String query = "MATCH (n:" + classname + ")";
            query += " WHERE n." + object.getPropertyName() + "=" + DatabaseUtils.getInstance().wrapUp(object.getPropertyValue());
            query += " RETURN n";
            Session session = Neo4jSessionFactory.getInstance().getNeo4jSession();
            return session.queryForObject(getClassType(), query, new HashMap());
        } catch(Exception e) {
            return null;
        }
    }

    @Override
    public final void save(T object) {
        try {
            Session session = Neo4jSessionFactory.getInstance().getNeo4jSession();
            session.save(object);
        } catch(Exception e) {}
    }

    @Override
    public final void delete(String id) {
        Session session = Neo4jSessionFactory.getInstance().getNeo4jSession();
        session.delete(find(id));
    }

    @Override
    public final long count() {
        Session session = Neo4jSessionFactory.getInstance().getNeo4jSession();
        return session.countEntitiesOfType(getClassType());
    }

    protected Session getSession() {
        return Neo4jSessionFactory.getInstance().getNeo4jSession();
    }

    @Override
    public Observable executeQuery(String query) {
        return Observable.fromIterable(getSession().query(getClassType(), query, new HashMap()));
    }

    protected  Observable executeQuery(Class type, String query) {
        return Observable.fromIterable(getSession().query(type, query, new HashMap()));
    }
}