/*
* =============================================================================
*
* Copyright (c) 2011-2014, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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
* 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.thymeleaf.spring4.expression;
import java.util.Locale;
import org.springframework.ui.context.Theme;
import org.springframework.web.servlet.support.RequestContext;
import org.thymeleaf.context.IContext;
import org.thymeleaf.context.IProcessingContext;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.spring4.naming.SpringContextVariableNames;
/**
* A utility object, accessed in Thymeleaf templates by the <tt>#themes</tt>
* expression, that provides the same features as the Spring
* <tt><spring:theme</tt> JSP tag.
*
* @author Emanuel Rabina
*/
public class Themes {
private final Theme theme;
private final Locale locale;
/**
* Constructor, obtains the current theme and locale from the processing
* context for code lookups later.
*
* @param processingContext the processing context being used
*/
public Themes(final IProcessingContext processingContext) {
super();
final IContext context = processingContext.getContext();
this.locale = context.getLocale();
final RequestContext requestContext = (RequestContext) processingContext.getContext().getVariables()
.get(SpringContextVariableNames.SPRING_REQUEST_CONTEXT);
this.theme = requestContext != null ? requestContext.getTheme() : null;
}
/**
* Looks up and returns the value of the given key in the properties file of
* the currently-selected theme.
*
* @param code Key to look up in the theme properties file.
* @return The value of the code in the current theme properties file, or an
* empty string if the code could not be resolved.
*/
public String code(final String code) {
if (this.theme == null) {
throw new TemplateProcessingException("Theme cannot be resolved because RequestContext was not found. "
+ "Are you using a Context object without a RequestContext variable?");
}
return this.theme.getMessageSource().getMessage(code, null, "", this.locale);
}
}