/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jdbi.v3.core.mapper;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.jdbi.v3.core.statement.StatementContext;
public abstract class EnumMapper<E extends Enum<E>> implements ColumnMapper<E> {
EnumMapper() {}
public static <E extends Enum<E>> ColumnMapper<E> byName(Class<E> type) {
return new ByName<>(type);
}
public static <E extends Enum<E>> ColumnMapper<E> byOrdinal(Class<E> type) {
return new ByOrdinal<>(type);
}
private static class ByName<E extends Enum<E>> extends EnumMapper<E> {
private final Class<E> type;
private ByName(Class<E> type) {
this.type = type;
}
@Override
public E map(ResultSet r, int columnNumber, StatementContext ctx) throws SQLException {
String name = r.getString(columnNumber);
return name == null ? null : Enum.valueOf(type, name);
}
}
private static class ByOrdinal<E extends Enum<E>> extends EnumMapper<E> {
private final E[] constants;
private ByOrdinal(Class<E> type) {
this.constants = type.getEnumConstants();
}
@Override
public E map(ResultSet r, int columnNumber, StatementContext ctx) throws SQLException {
int ordinal = r.getInt(columnNumber);
return r.wasNull() ? null : constants[ordinal];
}
}
}