com.klwork.ui.SpringVaadinSystemMessagesProvider.java Source code

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Here is the source code for com.klwork.ui.SpringVaadinSystemMessagesProvider.java

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/* 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.ui;

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;
    }
}