/**
    * 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.core.joran.action;
  
  import java.util.HashMap;
  import java.util.Map;
  
  
  import org.xml.sax.Attributes;
  
  import ch.qos.logback.core.CoreConstants;
  import ch.qos.logback.core.joran.spi.InterpretationContext;
  import ch.qos.logback.core.util.OptionHelper;
  
  
  
  public class ConversionRuleAction extends Action {
    boolean inError = false;
    
    /**
     * Instantiates an layout of the given class and sets its name.
     *
     */
    @SuppressWarnings("unchecked")
    public void begin(InterpretationContext ec, String localName, Attributes attributes) {
      // Let us forget about previous errors (in this object)
      inError = false;
  
      String errorMsg;
      String conversionWord =
        attributes.getValue(ActionConst.CONVERSION_WORD_ATTRIBUTE);
      String converterClass =
        attributes.getValue(ActionConst.CONVERTER_CLASS_ATTRIBUTE);
  
      if (OptionHelper.isEmpty(conversionWord)) {
        inError = true;
        errorMsg = "No 'conversionWord' attribute in <conversionRule>";
        addError(errorMsg);
  
        return;
      }
  
      if (OptionHelper.isEmpty(converterClass)) {
        inError = true;
        errorMsg = "No 'converterClass' attribute in <conversionRule>";
        ec.addError(errorMsg);
  
        return;
      }
  
      try {
        Map<String, String> ruleRegistry = (Map) context.getObject(CoreConstants.PATTERN_RULE_REGISTRY);
        if(ruleRegistry == null) {
          ruleRegistry = new HashMap<String, String>();
          context.putObject(CoreConstants.PATTERN_RULE_REGISTRY, ruleRegistry);
        }
        // put the new rule into the rule registry
        addInfo("registering conversion word "+conversionWord+" with class ["+converterClass+"]");
        ruleRegistry.put(conversionWord, converterClass);
      } catch (Exception oops) {
        inError = true;
        errorMsg = "Could not add conversion rule to PatternLayout.";
        addError(errorMsg);
      }
    }
  
    /**
     * Once the children elements are also parsed, now is the time to activate
     * the appender options.
     */
    public void end(InterpretationContext ec, String n) {
    }
  
    public void finish(InterpretationContext ec) {
    }
  }