/*
* [The "BSD licence"]
* Copyright (c) 2013-2014 Dandelion
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Dandelion nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.github.dandelion.core.config;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.Properties;
import java.util.ResourceBundle;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.dandelion.core.Context;
import com.github.dandelion.core.utils.PropertiesUtils;
import com.github.dandelion.core.utils.StringUtils;
import com.github.dandelion.core.utils.UTF8Control;
/**
* <p>
* Default implementation of the {@link ConfigurationLoader}.
*
* <p>
* Note that a custom {@link ConfigurationLoader} can be used thanks to the
* {@link Context}.
*
* @author Thibault Duchateau
* @author Romain Lespinasse
* @since 0.10.0
* @see ConfigurationLoader
* @see Context
* @see ConfigurationError
*/
public class StandardConfigurationLoader implements ConfigurationLoader {
// Logger
private static Logger LOG = LoggerFactory.getLogger(StandardConfigurationLoader.class);
public static final String DANDELION_USER_PROPERTIES = "dandelion";
public static final String DANDELION_CONFIGURATION = "dandelion.configuration";
/**
* {@inheritDoc}
*/
public Properties loadUserConfiguration() {
LOG.debug("Loading user configuration...");
ResourceBundle userBundle = null;
ResourceBundle.clearCache();
// First check if the resource bundle is externalized
if (StringUtils.isNotBlank(System.getProperty(DANDELION_CONFIGURATION))) {
String path = System.getProperty(DANDELION_CONFIGURATION);
try {
URL resourceURL = new File(path).toURI().toURL();
URLClassLoader urlLoader = new URLClassLoader(new URL[] { resourceURL });
userBundle = ResourceBundle.getBundle(DANDELION_USER_PROPERTIES, Locale.getDefault(), urlLoader,
new UTF8Control());
LOG.debug("User configuration loaded");
}
catch (MalformedURLException e) {
LOG.warn("Wrong path to the externalized bundle", e);
}
catch (MissingResourceException e) {
LOG.info("No *.properties file in {}. Trying to lookup in classpath...", path);
}
}
// No system property is set, retrieves the bundle from the classpath
if (userBundle == null) {
try {
// The user bundle is read using UTF-8
userBundle = ResourceBundle
.getBundle(DANDELION_USER_PROPERTIES, Locale.getDefault(), new UTF8Control());
LOG.debug("User configuration loaded");
}
catch (MissingResourceException e) {
// if no resource bundle is found, try using the context
// classloader
try {
userBundle = ResourceBundle.getBundle("dandelion/" + DANDELION_USER_PROPERTIES,
Locale.getDefault(), Thread.currentThread().getContextClassLoader(), new UTF8Control());
LOG.debug("User configuration loaded");
}
catch (MissingResourceException mre) {
LOG.debug("No custom configuration. Using default one.");
}
}
}
return PropertiesUtils.bundleToProperties(userBundle);
}
}