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/*
This file is part of Subsonic.
Subsonic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Subsonic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.theme;
import net.sourceforge.subsonic.service.*;
import net.sourceforge.subsonic.domain.*;
import org.springframework.web.servlet.*;
import javax.servlet.http.*;
import java.util.*;
/**
* Theme resolver implementation which returns the theme selected in the settings.
*
* @author Sindre Mehus
*/
public class SubsonicThemeResolver implements ThemeResolver {
private SecurityService securityService;
private SettingsService settingsService;
private Set<String> themeIds;
/**
* Resolve the current theme name via the given request.
*
* @param request Request to be used for resolution
* @return The current theme name
*/
public String resolveThemeName(HttpServletRequest request) {
String themeId = (String) request.getAttribute("subsonic.theme");
if (themeId != null) {
return themeId;
}
// Optimization: Cache theme in the request.
themeId = doResolveThemeName(request);
request.setAttribute("subsonic.theme", themeId);
return themeId;
}
private String doResolveThemeName(HttpServletRequest request) {
String themeId = null;
// Look for user-specific theme.
String username = securityService.getCurrentUsername(request);
if (username != null) {
UserSettings userSettings = settingsService.getUserSettings(username);
if (userSettings != null) {
themeId = userSettings.getThemeId();
}
}
if (themeId != null && themeExists(themeId)) {
return themeId;
}
// Return system theme.
themeId = settingsService.getThemeId();
return themeExists(themeId) ? themeId : "default";
}
/**
* Returns whether the theme with the given ID exists.
* @param themeId The theme ID.
* @return Whether the theme with the given ID exists.
*/
private synchronized boolean themeExists(String themeId) {
// Lazily create set of theme IDs.
if (themeIds == null) {
themeIds = new HashSet<String>();
Theme[] themes = settingsService.getAvailableThemes();
for (Theme theme : themes) {
themeIds.add(theme.getId());
}
}
return themeIds.contains(themeId);
}
/**
* Set the current theme name to the given one. This method is not supported.
*
* @param request Request to be used for theme name modification
* @param response Response to be used for theme name modification
* @param themeName The new theme name
* @throws UnsupportedOperationException If the ThemeResolver implementation
* does not support dynamic changing of the theme
*/
public void setThemeName(HttpServletRequest request, HttpServletResponse response, String themeName) {
throw new UnsupportedOperationException("Cannot change theme - use a different theme resolution strategy");
}
public void setSecurityService(SecurityService securityService) {
this.securityService = securityService;
}
public void setSettingsService(SettingsService settingsService) {
this.settingsService = settingsService;
}
}
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