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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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  package org.apache.cayenne.configuration.xml;
  
  import java.util.Map;
  import java.util.TreeMap;
  
  import org.apache.cayenne.map.DataMap;
  import org.xml.sax.Attributes;
  import org.xml.sax.ContentHandler;
  import org.xml.sax.SAXException;
  
  /**
   * @since 4.1
   */
  public class DataMapHandler extends NamespaceAwareNestedTagHandler {
  
      /* This constants must be in sync with dataMap.xsd schema */
      private static final String DATA_MAP_TAG         = "data-map";
      private static final String PROPERTY_TAG         = "property";
      private static final String DB_ENTITY_TAG        = "db-entity";
      private static final String OBJ_ENTITY_TAG       = "obj-entity";
      private static final String DB_RELATIONSHIP_TAG  = "db-relationship";
      private static final String OBJ_RELATIONSHIP_TAG = "obj-relationship";
      private static final String EMBEDDABLE_TAG       = "embeddable";
      private static final String PROCEDURE_TAG        = "procedure";
      private static final String QUERY_TAG            = "query";
  
      public static final String TRUE = "true";
  
      private DataMap dataMap;
  
      private Map<String, Object> mapProperties;
  
      public DataMapHandler(NamespaceAwareNestedTagHandler parentHandler) {
          super(parentHandler);
      }
  
      public DataMapHandler(LoaderContext loaderContext) {
          super(loaderContext);
          setTargetNamespace(DataMap.SCHEMA_XSD);
      }
  
      @Override
      protected boolean processElement(String namespaceURI, String localName,
                                       Attributes attributes) throws SAXException {
          switch (localName) {
              case PROPERTY_TAG:
                  addProperty(attributes);
                  return true;
  
              case DATA_MAP_TAG:
                  this.dataMap = new DataMap();
                  return true;
          }
  
          return false;
      }
  
      @Override
      protected ContentHandler createChildTagHandler(String namespaceURI, String localName,
                                                     String qName, Attributes attributes) {
  
          if(namespaceURI.equals(targetNamespace)) {
              switch (localName) {
                  case DB_ENTITY_TAG:
                      return new DbEntityHandler(this, dataMap);
  
                  case OBJ_ENTITY_TAG:
                      return new ObjEntityHandler(this, dataMap);
  
                  case DB_RELATIONSHIP_TAG:
                      return new DbRelationshipHandler(this, dataMap);
  
                  case OBJ_RELATIONSHIP_TAG:
                      return new ObjRelationshipHandler(this, dataMap);
  
                  case PROCEDURE_TAG:
                      return new ProcedureHandler(this, dataMap);
  
                  case QUERY_TAG:
                      return new QueryDescriptorHandler(this, dataMap);
  
                  case EMBEDDABLE_TAG:
                      return new EmbeddableHandler(this, dataMap);
              }
          }
  
          return super.createChildTagHandler(namespaceURI, localName, qName, attributes);
      }
  
      @Override
      protected void beforeScopeEnd() {
          dataMap.initWithProperties(mapProperties);
          loaderContext.dataMapLoaded(dataMap);
      }
  
      private void addProperty(Attributes attributes) throws SAXException {
          String name = attributes.getValue("name");
          if (null == name) {
              throw new SAXException("MapLoader::processStartDataMapProperty(), no property name.");
          }
  
          String value = attributes.getValue("value");
          if (null == value) {
              throw new SAXException("MapLoader::processStartDataMapProperty(), no property value.");
          }
  
          // special meaning for <property name="name" .../>
          if("name".equals(name)) {
              dataMap.setName(value);
              return;
          }
  
          if (mapProperties == null) {
              mapProperties = new TreeMap<>();
          }
  
          mapProperties.put(name, value);
      }
  
      public DataMap getDataMap() {
          return dataMap;
      }
  }
  