https://github.com/spring-projects/spring-framework: Spring Context (Spring IO)
  • Juergen Hoeller 
/*
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
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package org.springframework.ui.context;

import org.springframework.lang.Nullable;


Interface to be implemented by objects that can resolve Themes. This enables parameterization and internationalization of messages for a given 'theme'. 
Author:Jean-Pierre Pawlak, Juergen Hoeller
See Also:
/**
 * Interface to be implemented by objects that can resolve {@link Theme Themes}.
 * This enables parameterization and internationalization of messages
 * for a given 'theme'.
 *
 * @author Jean-Pierre Pawlak
 * @author Juergen Hoeller
 * @see Theme
 */
public interface ThemeSource {

	
Return the Theme instance for the given theme name.

The returned Theme will resolve theme-specific messages, codes,
file paths, etc (e.g. CSS and image files in a web environment).

Params:
  • themeName – the name of the theme
See Also:
  • ORIGINAL_DEFAULT_THEME_NAME.ORIGINAL_DEFAULT_THEME_NAME
Returns:the corresponding Theme, or null if none defined. Note that, by convention, a ThemeSource should at least be able to return a default Theme for the default theme name "theme" but may also return default Themes for other theme names.
/**
	 * Return the Theme instance for the given theme name.
	 * <p>The returned Theme will resolve theme-specific messages, codes,
	 * file paths, etc (e.g. CSS and image files in a web environment).
	 * @param themeName the name of the theme
	 * @return the corresponding Theme, or {@code null} if none defined.
	 * Note that, by convention, a ThemeSource should at least be able to
	 * return a default Theme for the default theme name "theme" but may also
	 * return default Themes for other theme names.
	 * @see org.springframework.web.servlet.theme.AbstractThemeResolver#ORIGINAL_DEFAULT_THEME_NAME
	 */
	@Nullable
	Theme getTheme(String themeName);

}