spring ValueConstants 源码
spring ValueConstants 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/handler/annotation/ValueConstants.java
/*
* Copyright 2002-2012 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.messaging.handler.annotation;
/**
* Common annotation value constants.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public interface ValueConstants {
/**
* Constant defining a value for no default - as a replacement for {@code null} which
* we cannot use in annotation attributes.
* <p>This is an artificial arrangement of 16 unicode characters, with its sole purpose
* being to never match user-declared values.
* @see Header#defaultValue()
*/
String DEFAULT_NONE = "\n\t\t\n\t\t\n\uE000\uE001\uE002\n\t\t\t\t\n";
}
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