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EPUBCheck is a tool to validate the conformance of EPUB publications against the EPUB specifications. EPUBCheck can be run as a standalone command-line tool or used as a Java library.

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package com.thaiopensource.util;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;

import com.adobe.epubcheck.messages.LocaleHolder;
import com.adobe.epubcheck.messages.LocalizedMessages;

import java.text.MessageFormat;

/**
 * This is a monkey-patch for Jing's {@link Localizer} class to attempt at
 * making it slightly more locale-aware.
 * 
 * Whenever a message is localized, is uses a {@link ResourceBundle} for the
 * {@code Locale} held as a thread-local static variable in the
 * {@code LocaleHolder} class.
 *
 */
public class Localizer
{
  private final Class cls;
  private final Map bundles = new HashMap<>();

  public Localizer(Class cls)
  {
    this.cls = cls;
  }

  public String message(String key)
  {
    return MessageFormat.format(getBundle().getString(key), new Object[]{});
  }

  public String message(String key, Object arg)
  {
    return MessageFormat.format(getBundle().getString(key), new Object[] { arg });
  }

  public String message(String key, Object arg1, Object arg2)
  {
    return MessageFormat.format(getBundle().getString(key), new Object[] { arg1, arg2 });
  }

  public String message(String key, Object[] args)
  {
    return MessageFormat.format(getBundle().getString(key), args);
  }

  private ResourceBundle getBundle()
  {
    Locale locale = LocaleHolder.get();
    if (!bundles.containsKey(locale))
    {
      String s = cls.getName();
      int i = s.lastIndexOf('.');
      if (i > 0) s = s.substring(0, i + 1);
      else
	s = "";
      bundles.put(locale, ResourceBundle.getBundle(s + "resources.Messages", LocaleHolder.get(),
          new LocalizedMessages.UTF8Control()));
    }
    return bundles.get(locale);
  }
}