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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram

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/*
 * Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details
 * (http://www.gnu.org/copyleft/lesser.html).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package jcckit.util;

/**
 *  An implementation of {@link ConfigData} based on two instances of
 *  {@link ConfigParameters}. The second one serves as a set of
 *  default parameters. It will be used if the first one has not the requested
 *  key-value pair.
 *
 *  @author Franz-Josef Elmer
 */
public class ConfigParametersBasedConfigData implements ConfigData {
  private ConfigParameters _config;
  private ConfigParameters _defaultConfig;

  /**
   * Creates an instance.
   * @param config A set of key-value pairs.
   * @param defaultConfig The default set of key-value pairs.
   */
  public ConfigParametersBasedConfigData(ConfigParameters config,
                                         ConfigParameters defaultConfig) {
    _config = config;
    _defaultConfig = defaultConfig;
  }

  /**
   * Returns the full key.
   * @param key A (relative) key. null is not allowed.
   * @return the full key including path.
   */
  public String getFullKey(String key) {
    return _config.getFullKey(key);
  }

  /**
   * Returns the value associated with this key.
   * @param key The relative key. null is not allowed.
   * @return the associated value. Will be null if no value exists
   *         for key.
   */
  public String get(String key) {
    String value = _config.get(key, null);
    return value == null ? _defaultConfig.get(key, null) : value;
  }

  /**
   * Returns the ConfigData object associated with this key.
   * @param key The relative key. null is not allowed.
   * @return the associated value. Will never return null.
   *         Instead an empty ConfigData is returned.
   */
  public ConfigData getNode(String key) {
    return new ConfigParametersBasedConfigData(_config.getNode(key),
                                               _defaultConfig.getNode(key));
  }
}