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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rapiddweller.common.converter;

import com.rapiddweller.common.IOUtil;
import com.rapiddweller.common.LocaleUtil;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;

/**
 * Converts key strings to localized texts by using a ResourceBundle.
 * Created: 07.06.2007 07:48:35
 *
 * @author Volker Bergmann
 */
public class PropertyResourceBundleConverter extends ThreadSafeConverter {

  private final ResourceBundle bundle;

  /**
   * Instantiates a new Property resource bundle converter.
   *
   * @param baseName the base name
   * @param locale   the locale
   */
  public PropertyResourceBundleConverter(String baseName, Locale locale) {
    super(String.class, String.class);
    ResourceBundle.Control control = new UTF8Control();
    bundle = PropertyResourceBundle.getBundle(baseName, locale, control);
  }

  @Override
  public String convert(String sourceValue) {
    return bundle.getString(sourceValue);
  }

  /**
   * The type Utf 8 control.
   */
  static class UTF8Control extends PropertyResourceBundle.Control {

    @Override
    public ResourceBundle newBundle(String baseName, Locale locale, String format, ClassLoader loader, boolean reload)
        throws IOException {
      String bundleName = toBundleName(baseName, locale);
      String resourceName = toResourceName(bundleName, "properties");
      InputStream stream = IOUtil.getInputStreamForURI(resourceName, true);
      Charset utf8 = StandardCharsets.UTF_8;
      return new PropertyResourceBundle(new InputStreamReader(stream, utf8));
    }

    @Override
    public Locale getFallbackLocale(String baseName, Locale locale) {
      Locale fallback = LocaleUtil.getFallbackLocale();
      return (fallback.equals(locale) ? null : fallback);
    }
  }

}