1 /* 2 * reserved comment block 3 * DO NOT REMOVE OR ALTER! 4 */ 5 /* 6 * Copyright 2001, 2002,2004 The Apache Software Foundation. 7 * 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.xerces.internal.impl.dv; 22 23 import java.util.Hashtable; 24 import com.sun.org.apache.xerces.internal.utils.ObjectFactory; 25 26 /** 27 * The factory to create and return DTD types. The implementation should 28 * store the created datatypes in static data, so that they can be shared by 29 * multiple parser instance, and multiple threads. 30 * 31 * @xerces.internal 32 * 33 * @author Sandy Gao, IBM 34 * 35 * @version $Id: DTDDVFactory.java,v 1.6 2010-11-01 04:39:43 joehw Exp $ 36 */ 37 public abstract class DTDDVFactory { 38 39 private static final String DEFAULT_FACTORY_CLASS = "com.sun.org.apache.xerces.internal.impl.dv.dtd.DTDDVFactoryImpl"; 40 41 /** 42 * Get an instance of the default DTDDVFactory implementation. 43 * 44 * @return an instance of DTDDVFactory implementation 45 * @exception DVFactoryException cannot create an instance of the specified 46 * class name or the default class name 47 */ 48 public static synchronized final DTDDVFactory getInstance() throws DVFactoryException { 49 return getInstance(DEFAULT_FACTORY_CLASS); 50 } 51 52 /** 53 * Get an instance of DTDDVFactory implementation. 54 * 55 * @param factoryClass name of the implementation to load. 56 * @return an instance of DTDDVFactory implementation 57 * @exception DVFactoryException cannot create an instance of the specified 58 * class name or the default class name 59 */ 60 public static synchronized final DTDDVFactory getInstance(String factoryClass) throws DVFactoryException { 61 62 try { 63 // if the class name is not specified, use the default one 64 return (DTDDVFactory) 65 (ObjectFactory.newInstance(factoryClass, true)); 66 } catch (ClassCastException e) { 67 throw new DVFactoryException("DTD factory class " + factoryClass + " does not extend from DTDDVFactory."); 68 } 69 } 70 71 // can't create a new object of this class 72 protected DTDDVFactory(){} 73 74 /** 75 * return a dtd type of the given name 76 * 77 * @param name the name of the datatype 78 * @return the datatype validator of the given name 79 */ 80 public abstract DatatypeValidator getBuiltInDV(String name); 81 82 /** 83 * get all built-in DVs, which are stored in a hashtable keyed by the name 84 * 85 * @return a hashtable which contains all datatypes 86 */ 87 public abstract Hashtable getBuiltInTypes(); 88 89 }