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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > dv > DTDDVFactory


1 /*
2  * The Apache Software License, Version 1.1
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4  *
5  * Copyright (c) 2001, 2002 The Apache Software Foundation. All rights
6  * reserved.
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8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
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13  * notice, this list of conditions and the following disclaimer.
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16  * notice, this list of conditions and the following disclaimer in
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20  * 3. The end-user documentation included with the redistribution,
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22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "Xerces" and "Apache Software Foundation" must
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29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
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47  * SUCH DAMAGE.
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50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation and was
52  * originally based on software copyright (c) 1999, International
53  * Business Machines, Inc., http://www.apache.org. For more
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55  * <http://www.apache.org/>.
56  */
57
58 package com.sun.org.apache.xerces.internal.impl.dv;
59
60 import java.util.Hashtable JavaDoc;
61
62 /**
63  * The factory to create and return DTD types. The implementation should
64  * store the created datatypes in static data, so that they can be shared by
65  * multiple parser instance, and multiple threads.
66  *
67  * @author Sandy Gao, IBM
68  *
69  * @version $Id: DTDDVFactory.java,v 1.7 2004/02/17 07:14:48 neeraj Exp $
70  */
71 public abstract class DTDDVFactory {
72
73     private static final String JavaDoc DEFAULT_FACTORY_CLASS = "com.sun.org.apache.xerces.internal.impl.dv.dtd.DTDDVFactoryImpl";
74
75     /**
76      * Get an instance of the default DTDDVFactory implementation.
77      *
78      * @return an instance of DTDDVFactory implementation
79      * @exception DVFactoryException cannot create an instance of the specified
80      * class name or the default class name
81      */
82     public static synchronized final DTDDVFactory getInstance() throws DVFactoryException {
83         return getInstance(DEFAULT_FACTORY_CLASS);
84     }
85
86     /**
87      * Get an instance of DTDDVFactory implementation.
88      *
89      * @param factoryClass name of the implementation to load.
90      * @return an instance of DTDDVFactory implementation
91      * @exception DVFactoryException cannot create an instance of the specified
92      * class name or the default class name
93      */
94     public static synchronized final DTDDVFactory getInstance(String JavaDoc factoryClass) throws DVFactoryException {
95
96         try {
97             // if the class name is not specified, use the default one
98 return (DTDDVFactory)
99                 (ObjectFactory.newInstance(factoryClass, ObjectFactory.findClassLoader(), true));
100         } catch (ClassCastException JavaDoc e) {
101             throw new DVFactoryException("DTD factory class " + factoryClass + " does not extend from DTDDVFactory.");
102         }
103     }
104
105     // can't create a new object of this class
106 protected DTDDVFactory(){}
107
108     /**
109      * return a dtd type of the given name
110      *
111      * @param name the name of the datatype
112      * @return the datatype validator of the given name
113      */
114     public abstract DatatypeValidator getBuiltInDV(String JavaDoc name);
115
116     /**
117      * get all built-in DVs, which are stored in a hashtable keyed by the name
118      *
119      * @return a hashtable which contains all datatypes
120      */
121     public abstract Hashtable JavaDoc getBuiltInTypes();
122
123 }
124
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