Java tutorial
/* 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 com.klwork.explorer.web; import com.vaadin.server.SystemMessages; import com.vaadin.server.SystemMessagesInfo; import com.vaadin.server.SystemMessagesProvider; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.MessageSource; import java.util.Locale; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentMap; /** * The Class SpringVaadinSystemMessagesProvider. */ public class SpringVaadinSystemMessagesProvider implements SystemMessagesProvider { public static final String DEFAULT_IMPLEMENTATION = "DEFAULT"; private static Logger logger = LoggerFactory.getLogger(SpringVaadinSystemMessagesProvider.class); private final ConcurrentMap<Locale, SystemMessages> systemMessagesCache = new ConcurrentHashMap<Locale, SystemMessages>(); private SpringSystemMessagesProvider systemMessagesBean; public SpringVaadinSystemMessagesProvider(ApplicationContext applicationContext, String systemMessagesBeanName) { if (systemMessagesBeanName.equals(DEFAULT_IMPLEMENTATION)) { MessageSource messageSource = applicationContext.getBean(MessageSource.class); systemMessagesBean = new DefaultSpringSystemMessagesProvider(); ((DefaultSpringSystemMessagesProvider) systemMessagesBean).setMessageSource(messageSource); logger.debug("use default systemMessagesBean"); } else { systemMessagesBean = applicationContext.getBean(systemMessagesBeanName, SpringSystemMessagesProvider.class); } logger.debug("get systemMessagesBean: {}", systemMessagesBean); } @Override public SystemMessages getSystemMessages(SystemMessagesInfo systemMessagesInfo) { Locale locale = systemMessagesInfo.getLocale(); if (systemMessagesCache.containsKey(locale)) { return systemMessagesCache.get(locale); } SystemMessages systemMessages = systemMessagesBean.getSystemMessages(locale); systemMessagesCache.put(locale, systemMessages); return systemMessages; } }