/*
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2026, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v2.0 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.model.AppenderModel;
  import ch.qos.logback.core.model.Model;
  
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * The AppenderAvailabilityAnalyser class is responsible for analyzing the availability
   * of appenders. By available, we mean whether an appender with a given name is declared
   * somewhere in the configuration. This availability information is later used by
   * AppenderRefModelHandler to attempt to attach only those appenders that were previously
   * declared.
   */
  @PhaseIndicator(phase = ProcessingPhase.DEPENDENCY_ANALYSIS)
  public class AppenderDeclarationAnalyser extends ModelHandlerBase {
  
      static final String DECLARED_APPENDER_NAME_SET_KEY = "DECLARED_APPENDER_NAME_SET";
  
  
      public AppenderDeclarationAnalyser(Context context) {
          super(context);
      }
  
      @Override
      protected Class<AppenderModel> getSupportedModelClass() {
          return AppenderModel.class;
      }
  
  
      @Override
      public void handle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
          AppenderModel appenderModel = (AppenderModel) model;
          String appenderName = mic.subst(appenderModel.getName());
  
          addAppenderDeclaration(mic, appenderName);
      }
  
  
      static public Set<String> getAppenderNameSet(ModelInterpretationContext mic) {
          Set<String> set = (Set<String>) mic.getObjectMap().get(DECLARED_APPENDER_NAME_SET_KEY);
          if(set == null) {
              set = new HashSet<>();
              mic.getObjectMap().put(DECLARED_APPENDER_NAME_SET_KEY, set);
          }
          return set;
      }
  
      static public void addAppenderDeclaration(ModelInterpretationContext mic, String appenderName) {
          Set<String> set = getAppenderNameSet(mic);
          set.add(appenderName);
      }
  
  
      static public boolean isAppenderDeclared(ModelInterpretationContext mic, String appenderName) {
          Set<String> set = getAppenderNameSet(mic);
          return set.contains(appenderName);
      }
  
  }