corda/classpath/java/util/ResourceBundle.java

/* Copyright (c) 2008-2013, Avian Contributors

   Permission to use, copy, modify, and/or distribute this software
   for any purpose with or without fee is hereby granted, provided
   that the above copyright notice and this permission notice appear
   in all copies.

   There is NO WARRANTY for this software.  See license.txt for
   details. */

package java.util;

import java.lang.reflect.Method;
import java.io.InputStream;
import java.io.IOException;

public abstract class ResourceBundle {
  protected String name;
  protected ResourceBundle parent;

  private static String replace(char a, char b, String s) {
    char[] array = new char[s.length()];
    for (int i = 0; i < array.length; ++i) {
      char c = s.charAt(i);
      array[i] = (c == a ? b : c);
    }
    return new String(array, 0, array.length, false);
  }

  private static ResourceBundle findProperties(String name, ClassLoader loader,
                                               ResourceBundle parent)
    throws IOException
  {
    InputStream in = loader.getResourceAsStream
      (replace('.', '/', name) + ".properties");
    if (in != null) {
      try {
        ResourceBundle r = new PropertyResourceBundle(in);
        r.name = name;
        r.parent = parent;
        return r;
      } finally {
        in.close();
      }
    } else {
      return null;
    }
  }

  private static ResourceBundle find(String name, ClassLoader loader,
                                     ResourceBundle parent)
    throws Exception
  {
    try {
      Class c = Class.forName(name, true, loader);
      if (c.isAssignableFrom(ResourceBundle.class)) {
        return (ResourceBundle) c.getConstructor().newInstance();
      }
    } catch (ClassNotFoundException ok) {
    } catch (NoSuchMethodException ok) { }

    return findProperties(name, loader, parent);
  }

  public static ResourceBundle getBundle(String name, Locale locale,
                                         ClassLoader loader)
  {
    try {
      ResourceBundle b = find(name, loader, null);

      if (locale.getLanguage() != null) {
        name = name + "_" + locale.getLanguage();
        ResourceBundle b2 = find(name, loader, b);
        if (b2 != null) b = b2;

        if (locale.getCountry() != null) {
          name = name + "_" + locale.getCountry();
          b2 = find(name, loader, b);
          if (b2 != null) b = b2;

          if (locale.getVariant() != null) {
            name = name + "_" + locale.getVariant();
            b2 = find(name, loader, b);
            if (b2 != null) b = b2;
          }
        }
      }
      return b;
    } catch (Exception e) {
      RuntimeException re = new MissingResourceException(name, name, null);
      re.initCause(e);
      throw re;
    }
  }

  public static ResourceBundle getBundle(String name, Locale locale) {
    return getBundle(name, locale, Method.getCaller().class_.loader);
  }

  public static ResourceBundle getBundle(String name) {
    return getBundle
      (name, Locale.getDefault(), Method.getCaller().class_.loader);
  }

  public Object getObject(String key) {
    for (ResourceBundle b = this; b != null; b = b.parent) {
      Object value = b.handleGetObject(key);
      if (value != null) {
        return value;
      }
    }
    throw new MissingResourceException(key, name, key);
  }

  public String getString(String key) {
    return (String) getObject(key);
  }

  protected abstract Object handleGetObject(String key);

  public abstract Enumeration<String> getKeys();
}