org.openmrs.web.OpenmrsCookieThemeResolver.java Source code

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Here is the source code for org.openmrs.web.OpenmrsCookieThemeResolver.java

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/**
 * This Source Code Form is subject to the terms of the Mozilla Public License,
 * v. 2.0. If a copy of the MPL was not distributed with this file, You can
 * obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
 * the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
 *
 * Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
 * graphic logo is a trademark of OpenMRS Inc.
 */
package org.openmrs.web;

import org.openmrs.api.context.Context;
import org.openmrs.util.OpenmrsConstants;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.theme.CookieThemeResolver;

/**
 * Customization of the spring theme resolver so that an admin can set a global property for the
 * default locale for the system
 *
 * This class will not throw an exception even if there is a problem retrieving that global property, since that
 * prevent even an error page from being displayed properly
 */
public class OpenmrsCookieThemeResolver extends CookieThemeResolver {

    private static final String GP_THEME_NAME = OpenmrsConstants.GLOBAL_PROPERTY_DEFAULT_THEME;

    /**
     * Return the name of the default theme.
     */
    @Override
    public String getDefaultThemeName() {

        // check the global properties for the current theme
        String themeName = null;
        boolean openedSession = false;
        try {
            if (!Context.isSessionOpen()) {
                // only try to open a session if one isn't open for us already
                openedSession = true;
                Context.openSession();
            }

            // check the admin-set global property for the theme
            themeName = Context.getAdministrationService().getGlobalProperty(GP_THEME_NAME);
        } catch (Exception ex) {
            // We must not throw an exception here, since this code is called from every page including the
            // for uncaught exceptions. Therefore we pass, and fall back to default behavior.
        } finally {
            // only close the session if we opened it
            if (openedSession) {
                Context.closeSession();
            }
        }

        if (StringUtils.hasText(themeName)) {
            return themeName;
        } else {
            return super.getDefaultThemeName();
        }
    }
}