spring AbstractUrlBasedView 源码
spring AbstractUrlBasedView 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/view/AbstractUrlBasedView.java
/*
* Copyright 2002-2017 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.view;
import java.util.Locale;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.lang.Nullable;
/**
* Abstract base class for URL-based views. Provides a consistent way of
* holding the URL that a View wraps, in the form of a "url" bean property.
*
* @author Juergen Hoeller
* @since 13.12.2003
*/
public abstract class AbstractUrlBasedView extends AbstractView implements InitializingBean {
@Nullable
private String url;
/**
* Constructor for use as a bean.
*/
protected AbstractUrlBasedView() {
}
/**
* Create a new AbstractUrlBasedView with the given URL.
* @param url the URL to forward to
*/
protected AbstractUrlBasedView(String url) {
this.url = url;
}
/**
* Set the URL of the resource that this view wraps.
* The URL must be appropriate for the concrete View implementation.
*/
public void setUrl(@Nullable String url) {
this.url = url;
}
/**
* Return the URL of the resource that this view wraps.
*/
@Nullable
public String getUrl() {
return this.url;
}
@Override
public void afterPropertiesSet() throws Exception {
if (isUrlRequired() && getUrl() == null) {
throw new IllegalArgumentException("Property 'url' is required");
}
}
/**
* Return whether the 'url' property is required.
* <p>The default implementation returns {@code true}.
* This can be overridden in subclasses.
*/
protected boolean isUrlRequired() {
return true;
}
/**
* Check whether the underlying resource that the configured URL points to
* actually exists.
* @param locale the desired Locale that we're looking for
* @return {@code true} if the resource exists (or is assumed to exist);
* {@code false} if we know that it does not exist
* @throws Exception if the resource exists but is invalid (e.g. could not be parsed)
*/
public boolean checkResource(Locale locale) throws Exception {
return true;
}
@Override
public String toString() {
return super.toString() + "; URL [" + getUrl() + "]";
}
}
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