spring AbstractRequestCondition 源码
spring AbstractRequestCondition 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/condition/AbstractRequestCondition.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.web.servlet.mvc.condition;
import java.util.Collection;
import java.util.StringJoiner;
import org.springframework.lang.Nullable;
/**
* A base class for {@link RequestCondition} types providing implementations of
* {@link #equals(Object)}, {@link #hashCode()}, and {@link #toString()}.
*
* @author Rossen Stoyanchev
* @since 3.1
* @param <T> the type of objects that this RequestCondition can be combined
* with and compared to
*/
public abstract class AbstractRequestCondition<T extends AbstractRequestCondition<T>> implements RequestCondition<T> {
/**
* Indicates whether this condition is empty, i.e. whether it
* contains any discrete items.
* @return {@code true} if empty; {@code false} otherwise
*/
public boolean isEmpty() {
return getContent().isEmpty();
}
/**
* Return the discrete items a request condition is composed of.
* <p>For example URL patterns, HTTP request methods, param expressions, etc.
* @return a collection of objects (never {@code null})
*/
protected abstract Collection<?> getContent();
/**
* The notation to use when printing discrete items of content.
* <p>For example {@code " || "} for URL patterns or {@code " && "}
* for param expressions.
*/
protected abstract String getToStringInfix();
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (other == null || getClass() != other.getClass()) {
return false;
}
return getContent().equals(((AbstractRequestCondition<?>) other).getContent());
}
@Override
public int hashCode() {
return getContent().hashCode();
}
@Override
public String toString() {
String infix = getToStringInfix();
StringJoiner joiner = new StringJoiner(infix, "[", "]");
for (Object expression : getContent()) {
joiner.add(expression.toString());
}
return joiner.toString();
}
}
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