content: /*
   * Licensed to the Apache Software Foundation (ASF) under one 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
   * 
   *      http://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 KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package mf.org.apache.xerces.impl.dv;
  
  import java.util.Hashtable;
  
  /**
   * The factory to create and return DTD types. The implementation should
   * store the created datatypes in static data, so that they can be shared by
   * multiple parser instance, and multiple threads.
   *
   * @author Sandy Gao, IBM
   * @version $Id: DTDDVFactory.java 558581 2007-07-23 01:38:26Z mrglavas $
   * @xerces.internal
   */
  public abstract class DTDDVFactory {
  
      private static final String DEFAULT_FACTORY_CLASS = "mf.org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl";
  
      // can't create a new object of this class
      protected DTDDVFactory() {
      }
  
      /**
       * Get an instance of the default DTDDVFactory implementation.
       *
       * @return an instance of DTDDVFactory implementation
       * @throws DVFactoryException cannot create an instance of the specified
       *                            class name or the default class name
       */
      public static final DTDDVFactory getInstance() throws DVFactoryException {
          return getInstance(DEFAULT_FACTORY_CLASS);
      }
  
      /**
       * Get an instance of DTDDVFactory implementation.
       *
       * @param factoryClass name of the implementation to load.
       * @return an instance of DTDDVFactory implementation
       * @throws DVFactoryException cannot create an instance of the specified
       *                            class name or the default class name
       */
      public static final DTDDVFactory getInstance(String factoryClass) throws DVFactoryException {
          try {
              // if the class name is not specified, use the default one
              return (DTDDVFactory)
                      (ObjectFactory.newInstance(factoryClass, ObjectFactory.findClassLoader(), true));
          } catch (ClassCastException e) {
              throw new DVFactoryException("DTD factory class " + factoryClass + " does not extend from DTDDVFactory.");
          }
      }
  
      /**
       * return a dtd type of the given name
       *
       * @param name the name of the datatype
       * @return the datatype validator of the given name
       */
      public abstract DatatypeValidator getBuiltInDV(String name);
  
      /**
       * get all built-in DVs, which are stored in a hashtable keyed by the name
       *
       * @return a hashtable which contains all datatypes
       */
      public abstract Hashtable getBuiltInTypes();
  
  }
  