PSVIDOMImplementationImpl


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57  
58  package com.sun.org.apache.xerces.internal.dom;
59  
60  import org.w3c.dom.DOMException  ;
61  import org.w3c.dom.DOMImplementation  ;
62  import org.w3c.dom.Document  ;
63  import org.w3c.dom.DocumentType  ;
64  import org.w3c.dom.Element  ;
65  
66  /**
67   * The DOMImplementation class is description of a particular
68   * implementation of the Document Object Model. As such its data is
69   * static, shared by all instances of this implementation.
70   * <P>
71   * The DOM API requires that it be a real object rather than static
72   * methods. However, there's nothing that says it can't be a singleton,
73   * so that's how I've implemented it.
74   *
75   * @version $Id: PSVIDOMImplementationImpl.java,v 1.4 2004/02/10 17:25:27 elena Exp $
76   * @since  PR-DOM-Level-1-19980818.
77   */
78  public class PSVIDOMImplementationImpl extends CoreDOMImplementationImpl {
79  
80      //
81      // Data
82      //
83  
84      // static
85  
86      /** Dom implementation singleton. */
87      static PSVIDOMImplementationImpl singleton = new PSVIDOMImplementationImpl();
88  
89      //
90      // Public methods
91      //
92  
93      /** NON-DOM: Obtain and return the single shared object */
94      public static DOMImplementation   getDOMImplementation() {
95          return singleton;
96      }  
97  
98      //
99      // DOMImplementation methods
100     //
101 
102     /** 
103      * Test if the DOM implementation supports a specific "feature" --
104      * currently meaning language and level thereof.
105      * 
106      * @param feature      The package name of the feature to test.
107      * In Level 1, supported values are "HTML" and "XML" (case-insensitive).
108      * At this writing, com.sun.org.apache.xerces.internal.dom supports only XML.
109      *
110      * @param version      The version number of the feature being tested.
111      * This is interpreted as "Version of the DOM API supported for the
112      * specified Feature", and in Level 1 should be "1.0"
113      *
114      * @return    true iff this implementation is compatable with the specified
115      * feature and version.
116      */
117     public boolean hasFeature(String   feature, String   version) {
118         return super.hasFeature(feature, version) ||
119                feature.equalsIgnoreCase("psvi");
120     } // hasFeature(String,String):boolean
121     
122     /**
123      * Introduced in DOM Level 2. <p>
124      * 
125      * Creates an XML Document object of the specified type with its document
126      * element.
127      *
128      * @param namespaceURI     The namespace URI of the document
129      *                         element to create, or null. 
130      * @param qualifiedName    The qualified name of the document
131      *                         element to create. 
132      * @param doctype          The type of document to be created or null.<p>
133      *
134      *                         When doctype is not null, its
135      *                         Node.ownerDocument attribute is set to
136      *                         the document being created.
137      * @return Document        A new Document object.
138      * @throws DOMException    WRONG_DOCUMENT_ERR: Raised if doctype has
139      *                         already been used with a different document.
140      * @since WD-DOM-Level-2-19990923
141      */
142     public Document             createDocument(String   namespaceURI, 
143                                              String   qualifiedName, 
144                                              DocumentType   doctype)
145                                              throws DOMException  
146     {
147         if (doctype != null && doctype.getOwnerDocument() != null) {
148             throw new DOMException  (DOMException.WRONG_DOCUMENT_ERR, 
149                                    DOMMessageFormatter.formatMessage(
150                                    DOMMessageFormatter.XML_DOMAIN, 
151                                    "WRONG_DOCUMENT_ERR", null));
152         }
153         DocumentImpl doc = new PSVIDocumentImpl(doctype);
154         Element   e = doc.createElementNS( namespaceURI, qualifiedName);
155         doc.appendChild(e);
156         return doc;
157     }
158     
159 
160 } // class DOMImplementationImpl
161
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