spring IntegerToEnumConverterFactory 源码
spring IntegerToEnumConverterFactory 代码
文件路径：/spring-core/src/main/java/org/springframework/core/convert/support/IntegerToEnumConverterFactory.java
/*
* 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];
}
}
}
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