spring DelegatingThemeSource 源码
spring DelegatingThemeSource 代码
文件路径：/spring-context/src/main/java/org/springframework/ui/context/support/DelegatingThemeSource.java
/*
* Copyright 2002-2018 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.ui.context.support;
import org.springframework.lang.Nullable;
import org.springframework.ui.context.HierarchicalThemeSource;
import org.springframework.ui.context.Theme;
import org.springframework.ui.context.ThemeSource;
/**
* Empty ThemeSource that delegates all calls to the parent ThemeSource.
* If no parent is available, it simply won't resolve any theme.
*
* <p>Used as placeholder by UiApplicationContextUtils, if a context doesn't
* define its own ThemeSource. Not intended for direct use in applications.
*
* @author Juergen Hoeller
* @since 1.2.4
* @see UiApplicationContextUtils
*/
public class DelegatingThemeSource implements HierarchicalThemeSource {
@Nullable
private ThemeSource parentThemeSource;
@Override
public void setParentThemeSource(@Nullable ThemeSource parentThemeSource) {
this.parentThemeSource = parentThemeSource;
}
@Override
@Nullable
public ThemeSource getParentThemeSource() {
return this.parentThemeSource;
}
@Override
@Nullable
public Theme getTheme(String themeName) {
if (this.parentThemeSource != null) {
return this.parentThemeSource.getTheme(themeName);
}
else {
return null;
}
}
}
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