Postgres9UserNotificationDao.java

package in.partake.model.dao.postgres9.impl;

import in.partake.base.TimeUtil;
import in.partake.model.dao.DAOException;
import in.partake.model.dao.DataIterator;
import in.partake.model.dao.MapperDataIterator;
import in.partake.model.dao.PartakeConnection;
import in.partake.model.dao.access.IUserNotificationAccess;
import in.partake.model.dao.postgres9.Postgres9Connection;
import in.partake.model.dao.postgres9.Postgres9Dao;
import in.partake.model.dao.postgres9.Postgres9DataIterator;
import in.partake.model.dao.postgres9.Postgres9Entity;
import in.partake.model.dao.postgres9.Postgres9EntityDao;
import in.partake.model.dao.postgres9.Postgres9EntityDataMapper;
import in.partake.model.dao.postgres9.Postgres9IdMapper;
import in.partake.model.dao.postgres9.Postgres9IndexDao;
import in.partake.model.dao.postgres9.Postgres9StatementAndResultSet;
import in.partake.model.daoutil.DAOUtil;
import in.partake.model.dto.UserNotification;

import java.util.List;

import org.codehaus.jackson.node.ObjectNode;

class EntityUserNotificationMapper extends Postgres9EntityDataMapper<UserNotification> {
    public UserNotification map(ObjectNode obj) {
        return new UserNotification(obj).freeze();
    }
}

public class Postgres9UserNotificationDao extends Postgres9Dao implements IUserNotificationAccess {
    static final String ENTITY_TABLE_NAME = "UserNotificationEntities";
    static final String INDEX_TABLE_NAME = "UserNotificationIndex";
    static final int CURRENT_VERSION = 1;

    private final Postgres9EntityDao entityDao;
    private final Postgres9IndexDao indexDao;
    private final EntityUserNotificationMapper mapper;

    public Postgres9UserNotificationDao() {
        this.entityDao = new Postgres9EntityDao(ENTITY_TABLE_NAME);
        this.indexDao = new Postgres9IndexDao(INDEX_TABLE_NAME);
        this.mapper = new EntityUserNotificationMapper();
    }

    @Override
    public void initialize(PartakeConnection con) throws DAOException {
        Postgres9Connection pcon = (Postgres9Connection) con;
        entityDao.initialize(pcon);

        if (!existsTable(pcon, INDEX_TABLE_NAME)) {
            // event id may be NULL if system message.
            indexDao.createIndexTable(pcon, "CREATE TABLE " + INDEX_TABLE_NAME + "(id TEXT PRIMARY KEY, userId TEXT NOT NULL, createdAt TIMESTAMP NOT NULL)");
            indexDao.createIndex(pcon, "CREATE INDEX " + INDEX_TABLE_NAME + "UserId" + " ON " + INDEX_TABLE_NAME + "(userId, createdAt)");
        }
    }

    @Override
    public void truncate(PartakeConnection con) throws DAOException {
        Postgres9Connection pcon = (Postgres9Connection) con;
        entityDao.truncate(pcon);
        indexDao.truncate(pcon);
    }

    @Override
    public void put(PartakeConnection con, UserNotification t) throws DAOException {
        Postgres9Connection pcon = (Postgres9Connection) con;

        // TODO: Why User does not have createdAt and modifiedAt?
        Postgres9Entity entity = new Postgres9Entity(t.getId(), CURRENT_VERSION, t.toJSON().toString().getBytes(UTF8), null, TimeUtil.getCurrentDateTime());
        if (entityDao.exists(pcon, t.getId()))
            entityDao.update(pcon, entity);
        else
            entityDao.insert(pcon, entity);
        indexDao.put(pcon, new String[] { "id", "userId", "createdAt" }, new Object[] { t.getId(), t.getUserId(), t.getCreatedAt() } );
    }

    @Override
    public UserNotification find(PartakeConnection con, String id) throws DAOException {
        return mapper.map(entityDao.find((Postgres9Connection) con, id));
    }

    @Override
    public List<UserNotification> findByUserId(PartakeConnection con, String userId, int offset, int limit) throws DAOException {
        Postgres9StatementAndResultSet psars = indexDao.select((Postgres9Connection) con,
                "SELECT id FROM " + INDEX_TABLE_NAME + " WHERE userId = ? OFFSET ? LIMIT ?",
                new Object[] { userId, offset, limit });

        Postgres9IdMapper<UserNotification> idMapper = new Postgres9IdMapper<UserNotification>((Postgres9Connection) con, mapper, entityDao);
        DataIterator<UserNotification> it = new Postgres9DataIterator<UserNotification>(idMapper, psars);
        return DAOUtil.freeze(DAOUtil.convertToList(it));
    }

    @Override
    public boolean exists(PartakeConnection con, String id) throws DAOException {
        return entityDao.exists((Postgres9Connection) con, id);
    }

    @Override
    public void remove(PartakeConnection con, String id) throws DAOException {
        Postgres9Connection pcon = (Postgres9Connection) con;
        entityDao.remove(pcon, id);
        indexDao.remove(pcon, "id", id);
    }

    @Override
    public DataIterator<UserNotification> getIterator(PartakeConnection con) throws DAOException {
        return new MapperDataIterator<Postgres9Entity, UserNotification>(mapper, entityDao.getIterator((Postgres9Connection) con));
    }

    @Override
    public String getFreshId(PartakeConnection con) throws DAOException {
        return entityDao.getFreshId((Postgres9Connection) con);
    }

    @Override
    public int count(PartakeConnection con) throws DAOException {
        return entityDao.count((Postgres9Connection) con);
    }
}