org.overlord.sramp.ui.server.rsvcs.LocalizationRemoteService.java Source code

Introduction

Here is the source code for org.overlord.sramp.ui.server.rsvcs.LocalizationRemoteService.java

Source

/*
 * Copyright 2012 JBoss Inc
 *
 * 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.overlord.sramp.ui.server.rsvcs;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;

import org.apache.commons.io.IOUtils;
import org.overlord.sramp.ui.server.util.ExceptionUtils;
import org.overlord.sramp.ui.shared.rsvcs.ILocalizationRemoteService;
import org.overlord.sramp.ui.shared.rsvcs.RemoteServiceException;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

/**
 * Implementation of the localization remote service.
 * 
 * TODO cache the messages in memory - no need to read them from the properties file every time
 *
 * @author eric.wittmann@redhat.com
 */
public class LocalizationRemoteService extends RemoteServiceServlet implements ILocalizationRemoteService {

    private static final long serialVersionUID = LocalizationRemoteService.class.hashCode();

    /**
     * Constructor.
     */
    public LocalizationRemoteService() {
    }

    /**
     * @see org.overlord.sramp.ui.shared.rsvcs.ILocalizationRemoteService#getMessages()
     */
    @Override
    public Map<String, String> getMessages() throws RemoteServiceException {
        try {
            Locale locale = this.getThreadLocalRequest().getLocale();
            Properties messages = getMessages(locale);
            HashMap<String, String> map = new HashMap<String, String>();
            for (Entry<Object, Object> entry : messages.entrySet())
                map.put((String) entry.getKey(), (String) entry.getValue());
            return map;
        } catch (IOException e) {
            throw ExceptionUtils.createRemoteException(e);
        }
    }

    /**
     * Gets the proper collection of messages for the given locale.
     * @param locale the current/desired locale
     * @return the localized messages
     * @throws IOException 
     */
    private Properties getMessages(Locale locale) throws IOException {
        String lang = locale.getLanguage();
        String country = locale.getCountry();
        if ("".equals(lang))
            lang = null;
        if ("".equals(country))
            country = null;

        Properties props = null;
        if (lang != null && country != null) {
            props = load("messages_" + lang + "_" + country + ".properties");
        }
        if (props == null && lang != null) {
            props = load("messages_" + lang + ".properties");
        }
        if (props == null) {
            props = load("messages.properties");
        }

        return props;
    }

    /**
     * Loads messages from a messages.properties file.
     * 
     * @param messagesFileName the filename of the properties file containing the messages
     * @return the messages
     * @throws IOException 
     */
    private Properties load(String messagesFileName) throws IOException {
        InputStream is = null;
        try {
            is = getClass().getClassLoader().getResourceAsStream("/META-INF/i18n/" + messagesFileName);
            if (is == null)
                return null;
            Properties props = new Properties();
            props.load(is);
            return props;
        } finally {
            IOUtils.closeQuietly(is);
        }
    }

}