net.sf.mmm.util.nls.impl.NlsReversedResourceBundleImpl Maven / Gradle / Ivy

/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
 * http://www.apache.org/licenses/LICENSE-2.0 */
package net.sf.mmm.util.nls.impl;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * This class is contains the reversed {@link Map} for a {@link ResourceBundle}. It allows to get the key for a
 * {@link ResourceBundle#getString(String) message}.
 *
 * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
 * @since 3.0.0
 * @deprecated replaced with simple Map in {@link DefaultNlsTemplateResolver}
 */
@Deprecated
public class NlsReversedResourceBundleImpl implements NlsReversedResourceBundle {

  private final String name;

  private final Map message2KeyMap;

  private final ResourceBundle resourceBundle;

  /**
   * The constructor.
   *
   * @param resourceBundle is the {@link ResourceBundle}.
   */
  public NlsReversedResourceBundleImpl(ResourceBundle resourceBundle) {

    super();
    this.resourceBundle = resourceBundle;
    this.name = resourceBundle.getClass().getName();
    this.message2KeyMap = new HashMap<>();
    Enumeration keyEnum = resourceBundle.getKeys();
    while (keyEnum.hasMoreElements()) {
      String key = keyEnum.nextElement();
      Object message = resourceBundle.getObject(key);
      if (message instanceof String) {
        this.message2KeyMap.put((String) message, key);
      }
    }
  }

  @Override
  public String getName() {

    return this.name;
  }

  /**
   * This method is the inverse of {@link ResourceBundle#getString(String)}.
   *
   * @param message is the {@link ResourceBundle#getString(String) message} for which the key is requested.
   * @return the key for the given {@code message} or {@code null} if no such message is contained in the associated
   *         {@link ResourceBundle}.
   */
  @Override
  public String getKey(String message) {

    return this.message2KeyMap.get(message);
  }

  @Override
  public String getString(String key) throws MissingResourceException {

    return this.resourceBundle.getString(key);
  }
}