spring ConditionalConverter 源码
spring ConditionalConverter 代码
文件路径：/spring-core/src/main/java/org/springframework/core/convert/converter/ConditionalConverter.java
/*
* Copyright 2002-2014 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.converter;
import org.springframework.core.convert.TypeDescriptor;
/**
* Allows a {@link Converter}, {@link GenericConverter} or {@link ConverterFactory} to
* conditionally execute based on attributes of the {@code source} and {@code target}
* {@link TypeDescriptor}.
*
* <p>Often used to selectively match custom conversion logic based on the presence of a
* field or class-level characteristic, such as an annotation or method. For example, when
* converting from a String field to a Date field, an implementation might return
* {@code true} if the target field has also been annotated with {@code @DateTimeFormat}.
*
* <p>As another example, when converting from a String field to an {@code Account} field,
* an implementation might return {@code true} if the target Account class defines a
* {@code public static findAccount(String)} method.
*
* @author Phillip Webb
* @author Keith Donald
* @since 3.2
* @see Converter
* @see GenericConverter
* @see ConverterFactory
* @see ConditionalGenericConverter
*/
public interface ConditionalConverter {
/**
* Should the conversion from {@code sourceType} to {@code targetType} currently under
* consideration be selected?
* @param sourceType the type descriptor of the field we are converting from
* @param targetType the type descriptor of the field we are converting to
* @return true if conversion should be performed, false otherwise
*/
boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType);
}
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