/*
 * Copyright 2002-2019 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.core.convert.support;

import org.springframework.core.convert.converter.Converter;
import org.springframework.core.convert.converter.ConverterFactory;

/**
 * Converts from an Integer to a {@link java.lang.Enum} by calling {@link Class#getEnumConstants()}.
 *
 * @author Yanming Zhou
 * @author Stephane Nicoll
 * @since 4.3
 */
@SuppressWarnings({"rawtypes", "unchecked"})
final class IntegerToEnumConverterFactory implements ConverterFactory<Integer, Enum> {

	@Override
	public <T extends Enum> Converter<Integer, T> getConverter(Class<T> targetType) {
		return new IntegerToEnum(ConversionUtils.getEnumType(targetType));
	}


	private static class IntegerToEnum<T extends Enum> implements Converter<Integer, T> {

		private final Class<T> enumType;

		public IntegerToEnum(Class<T> enumType) {
			this.enumType = enumType;
		}

		@Override
		public T convert(Integer source) {
			return this.enumType.getEnumConstants()[source];
		}
	}

}
