/*
* Copyright 2013 serso aka se.solovyev
*
* 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.
*
* ---------------------------------------------------------------------
* Contact details
*
* Email: se.solovyev@gmail.com
* Site: http://se.solovyev.org
*/
package org.solovyev.common.text;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;
public class EnumMapper<T extends Enum> implements Mapper<T> {
@Nonnull
private final static Map<Class<? extends Enum>, Mapper<?>> cachedMappers = new HashMap<Class<? extends Enum>, Mapper<?>>();
private final Class<T> enumClass;
private EnumMapper(@Nonnull Class<T> enumClass) {
this.enumClass = enumClass;
}
@Nonnull
public static <T extends Enum> Mapper<T> of(@Nonnull Class<T> enumClass) {
Mapper<T> result = (Mapper<T>) cachedMappers.get(enumClass);
if (result == null) {
// do not care about synchronization
result = new EnumMapper<T>(enumClass);
cachedMappers.put(enumClass, result);
}
return result;
}
@Override
public String formatValue(@Nullable T value) throws IllegalArgumentException {
return value == null ? null : value.name();
}
@Override
public T parseValue(@Nullable String value) throws IllegalArgumentException {
return value == null ? null : (T) Enum.valueOf(enumClass, value);
}
}