/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.core.joran.spi;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * A registry which maps a property in a host class to a default class.
   * 
   * @author Ceki Gülcü
   * 
   */
  public class DefaultNestedComponentRegistry {
  
      Map<HostClassAndPropertyDouble, Class<?>> defaultComponentMap = new HashMap<HostClassAndPropertyDouble, Class<?>>();
      Map<String, Class<?>> tagToClassMap = new HashMap<>();
  
      public void add(Class<?> hostClass, String propertyName, Class<?> componentClass) {
          HostClassAndPropertyDouble hpDouble = new HostClassAndPropertyDouble(hostClass, propertyName.toLowerCase());
          defaultComponentMap.put(hpDouble, componentClass);
          tagToClassMap.put(propertyName, componentClass);
      }
  
      public String findDefaultComponentTypeByTag(String tagName) {
          Class<?> defaultClass = tagToClassMap.get(tagName);
          if (defaultClass == null)
              return null;
          else
              return defaultClass.getCanonicalName();
      }
  
      public Class<?> findDefaultComponentType(Class<?> hostClass, String propertyName) {
          propertyName = propertyName.toLowerCase();
          while (hostClass != null) {
              Class<?> componentClass = oneShotFind(hostClass, propertyName);
              if (componentClass != null) {
                  return componentClass;
              }
              hostClass = hostClass.getSuperclass();
          }
          return null;
      }
  
      private Class<?> oneShotFind(Class<?> hostClass, String propertyName) {
          HostClassAndPropertyDouble hpDouble = new HostClassAndPropertyDouble(hostClass, propertyName);
          return defaultComponentMap.get(hpDouble);
      }
  
  }