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   *  or more contributor license agreements.  See the NOTICE file
   *  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
   *  with the License.  You may obtain a copy of the License at
   *
   *    https://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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   *  specific language governing permissions and limitations
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  package org.apache.cayenne.configuration.xml;
  
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.DbKeyGenerator;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  
  /**
   * @since 4.1
   */
  public class DbKeyGeneratorHandler extends NamespaceAwareNestedTagHandler {
  
      private static final String DB_KEY_GENERATOR_TAG = "db-key-generator";
      private static final String DB_GENERATOR_TYPE_TAG = "db-generator-type";
      private static final String DB_GENERATOR_NAME_TAG = "db-generator-name";
      private static final String DB_KEY_CACHE_SIZE_TAG = "db-key-cache-size";
  
      DbEntity entity;
  
      public DbKeyGeneratorHandler(NamespaceAwareNestedTagHandler parentHandler, DbEntity entity) {
          super(parentHandler);
          this.entity = entity;
      }
  
      @Override
      protected boolean processElement(String namespaceURI, String localName, Attributes attributes) throws SAXException {
          switch (localName) {
              case DB_KEY_GENERATOR_TAG:
                  createDbKeyGenerator();
                  return true;
  
              case DB_GENERATOR_NAME_TAG:
              case DB_GENERATOR_TYPE_TAG:
              case DB_KEY_CACHE_SIZE_TAG:
                  return true;
          }
  
          return false;
      }
  
      @Override
      protected boolean processCharData(String localName, String data) {
          switch (localName) {
              case DB_GENERATOR_TYPE_TAG:
                  setDbGeneratorType(data);
                  break;
  
              case DB_GENERATOR_NAME_TAG:
                  setDbGeneratorName(data);
                  break;
  
              case DB_KEY_CACHE_SIZE_TAG:
                  setDbKeyCacheSize(data);
                  break;
          }
          return true;
      }
  
      private void createDbKeyGenerator() {
          entity.setPrimaryKeyGenerator(new DbKeyGenerator());
      }
  
      private void setDbGeneratorType(String type) {
          if (entity == null) {
              return;
          }
          DbKeyGenerator pkGenerator = entity.getPrimaryKeyGenerator();
          pkGenerator.setGeneratorType(type);
          if (pkGenerator.getGeneratorType() == null) {
              entity.setPrimaryKeyGenerator(null);
          }
      }
  
      private void setDbGeneratorName(String name) {
          if (entity == null) {
              return;
          }
          DbKeyGenerator pkGenerator = entity.getPrimaryKeyGenerator();
          if (pkGenerator == null) {
              return;
          }
          pkGenerator.setGeneratorName(name);
      }
  
      private void setDbKeyCacheSize(String size) {
          if (entity == null) {
              return;
          }
          DbKeyGenerator pkGenerator = entity.getPrimaryKeyGenerator();
          if (pkGenerator == null) {
              return;
          }
          try {
              pkGenerator.setKeyCacheSize(Integer.valueOf(size.trim()));
          } catch (Exception ex) {
              pkGenerator.setKeyCacheSize(null);
          }
      }
  }
  