D-Net

package eu.dnetlib.openaire.user.dao;

import eu.dnetlib.openaire.user.Role;

import eu.dnetlib.openaire.user.store.DataSourceConnector;

import eu.dnetlib.openaire.user.store.Statement;

import org.springframework.beans.factory.annotation.Autowired;

import javax.sql.DataSource;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

import static eu.dnetlib.openaire.user.queries.RoleQueries.*;

/**

 * Created by sofia on 8/11/2016.

 */

public class RoleDAO {

    private final DataSource ds;

    @Autowired

    private DataSourceConnector dataSourceConnector;

    public RoleDAO() {

        this.ds = dataSourceConnector.getDatasource();

    }

    // FETCH

    public List<Role> fetchAll()

            throws SQLException

    {

        return (List<Role>) executeQuery(FETCH_ALL);

    }

    public Role fetchById(final int id)

            throws SQLException

    {

        List<Role> roles = executeQuery(FETCH_BY_ID, new Statement.Initializer() {

            @Override

            public void prepare(PreparedStatement stmt) throws SQLException {

                stmt.setInt(1, id);

            }

        });

        if (roles.isEmpty())

            return null;

        return roles.get(0);

    }

    public Role fetchByRole(final String role)

            throws SQLException

    {

        List<Role> roles = executeQuery(FETCH_BY_ROLE, new Statement.Initializer() {

            @Override

            public void prepare(PreparedStatement stmt) throws SQLException {

                stmt.setString(1, role);

            }

        });

        if (roles.isEmpty())

            return null;

        return roles.get(0);

    }

    public long countAll() throws SQLException

    {

        return executeCount(COUNT_ALL);

    }

    public boolean insert(final Role role)

            throws SQLException

    {

        return executeUpdate(INSERT, new Statement.Initializer() {

            @Override

            public void prepare(PreparedStatement stmt)

                    throws SQLException {

                stmt.setString(1, role.getRole());

            }

        }) > 0;

    }

    public boolean delete(final String role)

            throws SQLException

    {

        return executeUpdate(DELETE, new Statement.Initializer() {

            @Override

            public void prepare(PreparedStatement stmt)

                    throws SQLException {

                stmt.setString(1, role);

            }

        }) > 0;

    }

    public boolean update(final Role role)

            throws SQLException

    {

        return executeUpdate(UPDATE, new Statement.Initializer() {

            @Override

            public void prepare(PreparedStatement stmt)

                    throws SQLException {

                stmt.setString(1, role.getRole());

            }

        }) > 0;

    }

    protected Role fromResultSet(ResultSet set)

            throws SQLException

    {

        Role role = new Role(set.getString("role"));

        role.setId(set.getInt("id"));

        return role;

    }

    protected int executeUpdate(String sql, Statement.Initializer init)

            throws SQLException

    {

        Connection connection = ds.getConnection();

        try {

            PreparedStatement stmt = connection.prepareStatement(sql);

            init.prepare(stmt);

            return stmt.executeUpdate();

        } finally {

            connection.close();

        }

    }

    protected List<Role> executeQuery(String sql, Statement.Initializer init)

            throws SQLException

    {

        Connection connection = ds.getConnection();

        try {

            PreparedStatement stmt = connection.prepareStatement(sql);

            init.prepare(stmt);

            ResultSet set = stmt.executeQuery();

            try {

                List<Role> results = new ArrayList<>();

                while (set.next())

                    results.add(fromResultSet(set));

                return results;

            } finally {

                set.close();

            }

        } finally {

            connection.close();

        }

    }

    protected int executeUpdate(String sql)

            throws SQLException

    {

        return executeUpdate(sql, Statement.emptyInitializer());

    }

    protected List<Role> executeQuery(String sql)

            throws SQLException

    {

        return executeQuery(sql, Statement.emptyInitializer());

    }

    public long executeCount(String sql)

            throws SQLException

    {

        return executeCount(sql, Statement.emptyInitializer());

    }

    public long executeCount(String sql, Statement.Initializer init)

            throws SQLException

    {

        Connection connection = ds.getConnection();

        try {

            PreparedStatement stmt = connection.prepareStatement(sql);

            init.prepare(stmt);

            ResultSet set = stmt.executeQuery();

            try {

                if (set.next())

                    return set.getLong(1);

                throw new IllegalArgumentException(stmt.toString());

            } finally {

                set.close();

            }

        } finally {

            connection.close();

        }

    }

}