src/main/java/de/uapcore/lightpit/dao/AbstractDao.java

/*
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 *
 * Copyright 2018 Mike Becker. All rights reserved.
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 *      notice, this list of conditions and the following disclaimer.
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 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package de.uapcore.lightpit.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public abstract class AbstractDao<T> implements GenericDao<T> {

    protected abstract PreparedStatement listQuery(Connection connection) throws SQLException;

    protected abstract T mapColumns(ResultSet result) throws SQLException;

    @Override
    public List<T> list(Connection conn) throws SQLException {
        List<T> list = new ArrayList<>();
        try (PreparedStatement stmt = listQuery(conn);
             ResultSet result = stmt.executeQuery()) {
            while (result.next()) {
                list.add(mapColumns(result));
            }
        }
        return list;
    }
}