/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2011, 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.access.sift;
  
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  
  import ch.qos.logback.access.spi.IAccessEvent;
  import ch.qos.logback.core.Appender;
  import ch.qos.logback.core.joran.action.ActionConst;
  import ch.qos.logback.core.joran.action.AppenderAction;
  import ch.qos.logback.core.joran.spi.Pattern;
  import ch.qos.logback.core.joran.spi.RuleStore;
  import ch.qos.logback.core.sift.SiftingJoranConfiguratorBase;
  
  public class SiftingJoranConfigurator extends
      SiftingJoranConfiguratorBase<IAccessEvent> {
  
    String key;
    String value;
  
    SiftingJoranConfigurator(String key, String value) {
      this.key = key;
      this.value = value;
    }
  
    @Override
    protected Pattern initialPattern() {
      return new Pattern("configuration");
    }
  
    @Override
    protected void addInstanceRules(RuleStore rs) {
      rs.addRule(new Pattern("configuration/appender"), new AppenderAction());
    }
  
    @Override
    protected void buildInterpreter() {
      super.buildInterpreter();
      Map<String, Object> omap = interpreter.getInterpretationContext()
          .getObjectMap();
      omap.put(ActionConst.APPENDER_BAG, new HashMap());
      omap.put(ActionConst.FILTER_CHAIN_BAG, new HashMap());
      Map<String, String> propertiesMap = new HashMap<String, String>();
      propertiesMap.put(key, value);
      interpreter.setInterpretationContextPropertiesMap(propertiesMap);
    }
  
    @SuppressWarnings("unchecked")
    public Appender<IAccessEvent> getAppender() {
      Map<String, Object> omap = interpreter.getInterpretationContext()
          .getObjectMap();
      HashMap appenderMap = (HashMap) omap.get(ActionConst.APPENDER_BAG);
      oneAndOnlyOneCheck(appenderMap);
      Collection values = appenderMap.values();
      if(values.size() == 0) {
        return null;
      }
      return (Appender<IAccessEvent>) values.iterator().next();
    }
  }