/**
    * 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.util;
  
  import static ch.qos.logback.core.CoreConstants.FA_FILENAME_COLLISION_MAP;
  import static ch.qos.logback.core.CoreConstants.RFA_FILENAME_PATTERN_COLLISION_MAP;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Properties;
  
  import ch.qos.logback.core.Context;
  import ch.qos.logback.core.CoreConstants;
  import ch.qos.logback.core.hook.ShutdownHook;
  import ch.qos.logback.core.rolling.helper.FileNamePattern;
  import ch.qos.logback.core.spi.ContextAwareBase;
  
  public class ContextUtil extends ContextAwareBase {
  
      static final String GROOVY_RUNTIME_PACKAGE = "org.codehaus.groovy.runtime";
      // static final String SYSTEM_LOGGER_FQCN = "java.lang.System$Logger";
  
      public ContextUtil(Context context) {
          setContext(context);
      }
  
      public void addProperties(Properties props) {
          if (props == null) {
              return;
          }
  
          for (Entry<Object, Object> e : props.entrySet()) {
              String key = (String) e.getKey();
              context.putProperty(key, (String) e.getValue());
          }
  
      }
  
      public static Map<String, String> getFilenameCollisionMap(Context context) {
          if (context == null)
              return null;
          @SuppressWarnings("unchecked")
          Map<String, String> map = (Map<String, String>) context.getObject(FA_FILENAME_COLLISION_MAP);
          return map;
      }
  
      public static Map<String, FileNamePattern> getFilenamePatternCollisionMap(Context context) {
          if (context == null)
              return null;
          @SuppressWarnings("unchecked")
          Map<String, FileNamePattern> map = (Map<String, FileNamePattern>) context
                  .getObject(RFA_FILENAME_PATTERN_COLLISION_MAP);
          return map;
      }
  
      public void addGroovyPackages(List<String> frameworkPackages) {
          addFrameworkPackage(frameworkPackages, GROOVY_RUNTIME_PACKAGE);
      }
  
      public void addFrameworkPackage(List<String> frameworkPackages, String packageName) {
          if (!frameworkPackages.contains(packageName)) {
              frameworkPackages.add(packageName);
          }
      }
  
      /**
       * Add a shutdown hook thread with the JVM runtime.
       *
       * If a previous shutdown hook thread was registered, it is replaced.
       * @param hook
       * @since 1.5.7
       */
      public void addOrReplaceShutdownHook(ShutdownHook hook) {
          Runtime runtime = Runtime.getRuntime();
  
          Thread oldShutdownHookTread = (Thread) context.getObject(CoreConstants.SHUTDOWN_HOOK_THREAD);
          if(oldShutdownHookTread != null) {
              addInfo("Removing old shutdown hook from JVM runtime");
              runtime.removeShutdownHook(oldShutdownHookTread);
          }
  
          Thread hookThread = new Thread(hook, "Logback shutdown hook [" + context.getName() + "]");
          addInfo("Registering shutdown hook with JVM runtime.");
          context.putObject(CoreConstants.SHUTDOWN_HOOK_THREAD, hookThread);
          runtime.addShutdownHook(hookThread);
  
      }
 
 }