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Java > Open Source Codes > com > sun > org > apache > xerces > internal > dom > DOMXSImplementationSourceImpl


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57
58 package com.sun.org.apache.xerces.internal.dom;
59
60 import com.sun.org.apache.xerces.internal.impl.xs.XSImplementationImpl;
61 import org.w3c.dom.DOMImplementationList JavaDoc;
62 import org.w3c.dom.DOMImplementation JavaDoc;
63 import java.util.Vector JavaDoc;
64
65 /**
66  * Allows to retrieve <code>XSImplementation</code>, DOM Level 3 Core and LS implementations
67  * and PSVI implementation.
68  * <p>See also the <a HREF='http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/core.html#DOMImplementationSource'>Document Object Model (DOM) Level 3 Core Specification</a>.
69  * @author Elena Litani, IBM
70  * @version $Id: DOMXSImplementationSourceImpl.java,v 1.3 2004/04/23 21:45:04 mrglavas Exp $
71  */
72 public class DOMXSImplementationSourceImpl
73     extends DOMImplementationSourceImpl {
74     
75     /**
76      * A method to request a DOM implementation.
77      * @param features A string that specifies which features are required.
78      * This is a space separated list in which each feature is specified
79      * by its name optionally followed by a space and a version number.
80      * This is something like: "XML 1.0 Traversal Events 2.0"
81      * @return An implementation that has the desired features, or
82      * <code>null</code> if this source has none.
83      */
84     public DOMImplementation JavaDoc getDOMImplementation(String JavaDoc features) {
85         DOMImplementation JavaDoc impl = super.getDOMImplementation(features);
86         if (impl != null){
87             return impl;
88         }
89         // if not try the PSVIDOMImplementation
90 impl = PSVIDOMImplementationImpl.getDOMImplementation();
91         if (testImpl(impl, features)) {
92             return impl;
93         }
94         // if not try the XSImplementation
95 impl = XSImplementationImpl.getDOMImplementation();
96         if (testImpl(impl, features)) {
97             return impl;
98         }
99         
100         return null;
101     }
102     
103     /**
104      * A method to request a list of DOM implementations that support the
105      * specified features and versions, as specified in .
106      * @param features A string that specifies which features and versions
107      * are required. This is a space separated list in which each feature
108      * is specified by its name optionally followed by a space and a
109      * version number. This is something like: "XML 3.0 Traversal +Events
110      * 2.0"
111      * @return A list of DOM implementations that support the desired
112      * features.
113      */
114     public DOMImplementationList JavaDoc getDOMImplementationList(String JavaDoc features) {
115         final Vector JavaDoc implementations = new Vector JavaDoc();
116         
117         // first check whether the CoreDOMImplementation would do
118 DOMImplementationList JavaDoc list = super.getDOMImplementationList(features);
119         //Add core DOMImplementations
120 for (int i=0; i < list.getLength(); i++ ) {
121             implementations.addElement(list.item(i));
122         }
123         
124         DOMImplementation JavaDoc impl = PSVIDOMImplementationImpl.getDOMImplementation();
125         if (testImpl(impl, features)) {
126             implementations.addElement(impl);
127         }
128         
129         impl = XSImplementationImpl.getDOMImplementation();
130         if (testImpl(impl, features)) {
131             implementations.addElement(impl);
132         }
133         return new DOMImplementationListImpl(implementations);
134     }
135 }
136
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