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   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you under the Apache License, Version 2.0 (the
   *  "License"); you may not use this file except in compliance
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   *    https://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.cayenne.modeler.validation.extension;
  
  import org.apache.cayenne.configuration.xml.DataChannelMetaData;
  import org.apache.cayenne.configuration.xml.NamespaceAwareNestedTagHandler;
  import org.apache.cayenne.project.validation.Inspection;
  import org.apache.cayenne.project.validation.ValidationConfig;
  import org.xml.sax.Attributes;
  
  import java.util.EnumSet;
  import java.util.Set;
  
  /**
   * @since 5.0
   */
  public class ValidationConfigHandler extends NamespaceAwareNestedTagHandler {
  
      static final String CONFIG_TAG = "validation";
  
      static final String EXCLUDE_TAG = "exclude";
  
      private final DataChannelMetaData metaData;
      private final EnumSet<Inspection> disabledInspections;
  
      ValidationConfigHandler(NamespaceAwareNestedTagHandler parentHandler, DataChannelMetaData metaData) {
          super(parentHandler);
          this.metaData = metaData;
          targetNamespace = ValidationExtension.NAMESPACE;
          disabledInspections = EnumSet.noneOf(Inspection.class);
      }
  
      @Override
      protected boolean processElement(String namespaceURI, String localName, Attributes attributes) {
          if (CONFIG_TAG.equals(localName)) {
              disabledInspections.clear();
              return true;
          }
          return false;
      }
  
      @Override
      protected boolean processCharData(String localName, String data) {
          if (localName.equals(EXCLUDE_TAG)) {
              disabledInspections.add(Inspection.valueOf(data));
              return true;
          }
          return false;
      }
  
      @Override
      public void endElement(String namespaceURI, String localName, String qName) {
          if (CONFIG_TAG.equals(localName)) {
              createConfig();
          }
      }
  
      private void createConfig() {
          Set<Inspection> enabledInspections = EnumSet.complementOf(disabledInspections);
          loaderContext.addDataChannelListener(dataChannel -> {
              metaData.add(dataChannel, new ValidationConfig(enabledInspections));
          });
      }
  }
  