/**
    * 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.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.JoranConstants;
  import ch.qos.logback.core.joran.spi.SaxEventInterpretationContext;
  import ch.qos.logback.core.util.OptionHelper;
  
  public class ConversionRuleAction extends Action {
      boolean inError = false;
  
      /**
       * Instantiates a layout of the given class and sets its name.
       *
       */
      @SuppressWarnings("unchecked")
      public void begin(SaxEventInterpretationContext ec, String localName, Attributes attributes) {
          // Let us forget about previous errors (in this object)
          inError = false;
  
          String errorMsg;
          String conversionWord = attributes.getValue(JoranConstants.CONVERSION_WORD_ATTRIBUTE);
          String converterClass = attributes.getValue(JoranConstants.CONVERTER_CLASS_ATTRIBUTE);
  
          if (OptionHelper.isNullOrEmptyOrAllSpaces(conversionWord)) {
              inError = true;
              errorMsg = "No 'conversionWord' attribute in <conversionRule>";
              addError(errorMsg);
  
              return;
          }
  
          if (OptionHelper.isNullOrEmptyOrAllSpaces(converterClass)) {
              inError = true;
              errorMsg = "No 'converterClass' attribute in <conversionRule>";
              ec.addError(errorMsg);
  
              return;
          }
  
          try {
              Map<String, String> ruleRegistry = (Map<String, String>) 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(SaxEventInterpretationContext ec, String n) {
      }
  
      public void finish(SaxEventInterpretationContext ec) {
      }
  }