【Java】Resource Bundleのロードをカスタムするプログラム

2014年7月12日

Resource Bundleのロードをカスタムするプログラム

1.ファイル名
XMLResourceBundleControl.java
サンプルコード：
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
import java.util.ResourceBundle;
import java.util.Set;

public class XMLResourceBundleControl extends ResourceBundle.Control {
private static String XML = “xml";

public List<String> getFormats(String baseName) {
return Collections.singletonList(XML);
}

public ResourceBundle newBundle(String baseName, Locale locale, String format,
ClassLoader loader, boolean reload) throws IllegalAccessException, InstantiationException,
IOException {

if ((baseName == null) || (locale == null) || (format == null) || (loader == null)) {
throw new NullPointerException();
}
ResourceBundle bundle = null;
if (!format.equals(XML)) {
return null;
}

String bundleName = toBundleName(baseName, locale);
String resourceName = toResourceName(bundleName, format);
URL url = loader.getResource(resourceName);
if (url == null) {
return null;
}
URLConnection connection = url.openConnection();
if (connection == null) {
return null;
}
if (reload) {
connection.setUseCaches(false);
}
InputStream stream = connection.getInputStream();
if (stream == null) {
return null;
}
BufferedInputStream bis = new BufferedInputStream(stream);
bundle = new XMLResourceBundle(bis);
bis.close();

return bundle;
}

public static void main(String args[]) {
ResourceBundle bundle = ResourceBundle.getBundle(“Strings", new XMLResourceBundleControl());
String string = bundle.getString(“Key");
System.out.println(“Key: " + string);
}
}

class XMLResourceBundle extends ResourceBundle {
private Properties props;

XMLResourceBundle(InputStream stream) throws IOException {
props = new Properties();
props.loadFromXML(stream);
}

protected Object handleGetObject(String key) {
return props.getProperty(key);
}

public Enumeration<String> getKeys() {
Set<String> handleKeys = props.stringPropertyNames();
return Collections.enumeration(handleKeys);
}
}

2.ファイル名
Strings.xml
サンプルコード：
<?xml version="1.0″ encoding="UTF-8″?>
<properties>
<entry key="Key" value="Value"/>
</properties>