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/*
 * 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: [email protected]
 * 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;

/**
 * User: serso
 * Date: 12/25/11
 * Time: 1:17 PM
 */
public class EnumMapper implements Mapper {

	/*
	**********************************************************************
	*
	*                           STATIC
	*
	**********************************************************************
	*/

	@Nonnull
	private final static Map, Mapper> cachedMappers = new HashMap, Mapper>();

	/*
	**********************************************************************
	*
	*                           FIELDS
	*
	**********************************************************************
	*/

	@Nonnull
	private final Class enumClass;

	/*
	**********************************************************************
	*
	*                           CONSTRUCTORS
	*
	**********************************************************************
	*/

	private EnumMapper(@Nonnull Class enumClass) {
		this.enumClass = enumClass;
	}

	@Nonnull
	public static  Mapper of(@Nonnull Class enumClass) {
		Mapper result = (Mapper) cachedMappers.get(enumClass);
		if (result == null) {
			// do not care about synchronization
			result = new EnumMapper(enumClass);
			cachedMappers.put(enumClass, result);
		}

		return result;
	}

	/*
	**********************************************************************
	*
	*                           METHODS
	*
	**********************************************************************
	*/

	@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);
	}
}