/**
* Copyright (c) 2012-2016 André Bargull
* Alle Rechte vorbehalten / All Rights Reserved. Use is subject to license terms.
*
* <https://github.com/anba/es6draft>
*/
package com.github.anba.es6draft.runtime.internal;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
/**
* {@link java.util.ResourceBundle.Control} subclass to create {@link PropertyResourceBundle}
* objects which use a configurable encoding instead of the default ISO-8859-1 encoding.
*/
public class PropertiesReaderControl extends ResourceBundle.Control {
private final Charset charset;
/**
* Creates a new {@link PropertiesReaderControl} instance with the supplied character encoding.
*
* @param charset
* the requested character set
*/
public PropertiesReaderControl(Charset charset) {
this.charset = charset;
}
@Override
public List<String> getFormats(String baseName) {
return FORMAT_PROPERTIES;
}
@Override
public ResourceBundle newBundle(String baseName, Locale locale, String format,
ClassLoader loader, boolean reload) throws IOException {
if ("java.properties".equals(format)) {
String bundleName = toBundleName(baseName, locale);
String resourceName = toResourceName(bundleName, "properties");
InputStream stream = getInputStream(loader, resourceName, reload);
if (stream == null) {
return null;
}
try (Reader reader = new InputStreamReader(stream, charset)) {
return new PropertyResourceBundle(reader);
}
}
throw new IllegalArgumentException("unknown format: " + format);
}
private static InputStream getInputStream(ClassLoader loader, String resourceName,
boolean reload) throws IOException {
URL url = loader.getResource(resourceName);
if (url == null) {
return null;
}
URLConnection connection = url.openConnection();
connection.setUseCaches(!reload);
return connection.getInputStream();
}
}