/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2022, 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.model.processor;
  
  import ch.qos.logback.core.Context;
  import ch.qos.logback.core.joran.action.ActionUtil;
  import ch.qos.logback.core.joran.action.ActionUtil.Scope;
  import ch.qos.logback.core.model.DefineModel;
  import ch.qos.logback.core.model.Model;
  import ch.qos.logback.core.spi.LifeCycle;
  import ch.qos.logback.core.spi.PropertyDefiner;
  import ch.qos.logback.core.util.OptionHelper;
  
  /**
   * Instantiate class for define property value. Get future property name and
   * property definer class from attributes. Some property definer properties
   * could be used. After defining put new property to context.
   * 
   * @author Aleksey Didik
   */
  public class DefineModelHandler extends ModelHandlerBase {
  
      boolean inError;
      PropertyDefiner definer;
      String propertyName;
      Scope scope;
  
      public DefineModelHandler(Context context) {
          super(context);
      }
  
      static public DefineModelHandler makeInstance(Context context, ModelInterpretationContext ic) {
          return new DefineModelHandler(context);
      }
  
      @Override
      protected Class<DefineModel> getSupportedModelClass() {
          return DefineModel.class;
      }
  
      @Override
      public void handle(ModelInterpretationContext interpretationContext, Model model) throws ModelHandlerException {
          definer = null;
          inError = false;
          propertyName = null;
  
          DefineModel defineModel = (DefineModel) model;
  
          propertyName = defineModel.getName();
          String scopeStr = defineModel.getScopeStr();
  
          scope = ActionUtil.stringToScope(scopeStr);
  
          if (OptionHelper.isNullOrEmptyOrAllSpaces(propertyName)) {
              addError("Missing property name for property definer. Near [" + model.getTag() + "] line "
                      + model.getLineNumber());
              inError = true;
          }
  
          // read property definer class name
          String className = defineModel.getClassName();
          if (OptionHelper.isNullOrEmptyOrAllSpaces(className)) {
              addError("Missing class name for property definer. Near [" + model.getTag() + "] line "
                      + model.getLineNumber());
              inError = true;
          } else {
              className = interpretationContext.getImport(className);
          }
  
          if (inError)
              return;
  
          // try to instantiate property definer
          try {
              addInfo("About to instantiate property definer of type [" + className + "]");
              definer = (PropertyDefiner) OptionHelper.instantiateByClassName(className, PropertyDefiner.class, context);
              definer.setContext(context);
              interpretationContext.pushObject(definer);
          } catch (Exception oops) {
              inError = true;
              addError("Could not create an PropertyDefiner of type [" + className + "].", oops);
              throw new ModelHandlerException(oops);
          }
  
      }
  
      /**
       * Now property definer is initialized by all properties and we can put property
      * value to context
      */
     @Override
     public void postHandle(ModelInterpretationContext interpretationContext, Model model) throws ModelHandlerException {
         if (inError) {
             return;
         }
 
         Object o = interpretationContext.peekObject();
 
         if (o != definer) {
             addWarn("The object at the of the stack is not the property definer for property named [" + propertyName
                     + "] pushed earlier.");
         } else {
             interpretationContext.popObject();
             if (definer instanceof LifeCycle)
                 ((LifeCycle) definer).start();
 
             // let's put defined property and value to context but only if it is
             // not null
             String propertyValue = definer.getPropertyValue();
             if (propertyValue != null) {
                 addInfo("Setting property " + propertyName + "=" + propertyValue + " in scope " + scope);
                 ActionUtil.setProperty(interpretationContext, propertyName, propertyValue, scope);
             }
         }
 
     }
 }