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PlantUML is a component that allows to quickly write diagrams from text.
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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 {
    // ::remove folder when __HAXE__
  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));
  }
}