org.araneaframework.servlet.support.ReloadingPropertyFileResourceBundle.java Source code

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Here is the source code for org.araneaframework.servlet.support.ReloadingPropertyFileResourceBundle.java

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/**
 * Copyright 2006 Webmedia Group Ltd.
 *
 * 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.araneaframework.servlet.support;

import java.io.File;
import java.io.FileInputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.lang.exception.NestableRuntimeException;
import org.apache.log4j.Logger;

/**
 * @author <a href="mailto:ekabanov@webmedia.ee">Jevgeni Kabanov </a>
 * @since {since}
 */
public class ReloadingPropertyFileResourceBundle extends LocaleAwareResourceBundle {

    private static Logger log = Logger.getLogger(ReloadingPropertyFileResourceBundle.class);

    protected String propertyResource = "resources";

    protected long lastReloadTime;
    protected long checkTime;
    protected long lastModified = 0;

    protected Map properties = new HashMap();

    public ReloadingPropertyFileResourceBundle() {
    }

    public ReloadingPropertyFileResourceBundle(String propertyResource) {
        this.propertyResource = propertyResource;
    }

    protected Object handleGetObject(String key) {
        if (key == null)
            throw new NullPointerException();

        if (checkTime != -1 && System.currentTimeMillis() - lastReloadTime > checkTime) {
            reloadProperties();
        }

        return handleGetCachedObject(key);
    }

    private void reloadProperties() {
        try {
            String resourceName = propertyResource + "_" + getLocale().getLanguage() + ".properties";
            URL propertyURL = getClass().getClassLoader().getResource(resourceName);

            if (propertyURL == null) {
                resourceName = propertyResource + ".properties";
                propertyURL = getClass().getClassLoader().getResource(resourceName);
            }

            File propertyFile = new File(propertyURL.getFile());

            if (lastModified < propertyFile.lastModified()) {

                log.debug("Reloading localization data from property file '" + propertyFile + "'.");

                Properties result = new Properties();
                result.load(new FileInputStream(propertyURL.getFile()));

                loadData(result);

                lastReloadTime = System.currentTimeMillis();
                lastModified = propertyFile.lastModified();
            }
        } catch (RuntimeException re) {
            throw re;
        } catch (Exception e) {
            throw new NestableRuntimeException(e);
        }
    }

    protected Object handleGetCachedObject(String key) {
        return properties.get(key);
    }

    protected void loadData(Properties newProperties) throws Exception {
        properties = new HashMap();

        for (Enumeration i = newProperties.propertyNames(); i.hasMoreElements();) {
            String key = (String) i.nextElement();
            String value = newProperties.getProperty(key);

            properties.put(key, value);
        }
    }

    public Enumeration getKeys() {
        return null;
    }
}