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Java > Open Source Codes > org > jboss > util > xml > catalog > helpers > Namespaces


1 // Namespaces.java - Analyze namespace nodes in a DOM tree
2
3 /* ====================================================================
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56
57 package org.jboss.util.xml.catalog.helpers;
58
59 import org.w3c.dom.*;
60
61 /**
62  * Static Namespace query methods.
63  *
64  * <p>This class defines a set of static methods that can be called
65  * to analyze the namespace properties of DOM nodes.</p>
66  *
67  * @author Norman Walsh
68  * <a HREF="mailto:Norman.Walsh@Sun.COM">Norman.Walsh@Sun.COM</a>
69  *
70  * @version 1.0
71  */
72 public class Namespaces {
73     /**
74      * Returns the "prefix" part of a QName or the empty string (not
75      * null) if the name has no prefix.
76      *
77      * @param element The QName of an element.
78      * @return The prefix part of the element name.
79      */
80     public static String JavaDoc getPrefix(Element element) {
81     String JavaDoc name = element.getTagName();
82     String JavaDoc prefix = "";
83
84     if (name.indexOf(':') > 0) {
85         prefix = name.substring(0, name.indexOf(':'));
86     }
87
88     return prefix;
89     }
90
91     /**
92      * Returns the "localname" part of a QName, which is the whole
93      * name if it has no prefix.
94      *
95      * @param element The QName of an element.
96      * @return The local part of a QName.
97      */
98     public static String JavaDoc getLocalName(Element element) {
99     String JavaDoc name = element.getTagName();
100
101     if (name.indexOf(':') > 0) {
102         name = name.substring(name.indexOf(':')+1);
103     }
104
105     return name;
106     }
107
108     /**
109      * Returns the namespace URI for the specified prefix at the
110      * specified context node.
111      *
112      * @param node The context node.
113      * @param prefix The prefix.
114      * @return The namespace URI associated with the prefix, or
115      * null if no namespace declaration exists for the prefix.
116      */
117     public static String JavaDoc getNamespaceURI(Node node, String JavaDoc prefix) {
118     if (node == null || node.getNodeType() != Node.ELEMENT_NODE) {
119         return null;
120     }
121
122     if (prefix.equals("")) {
123         if (((Element) node).hasAttribute("xmlns")) {
124         return ((Element) node).getAttribute("xmlns");
125         }
126     } else {
127         String JavaDoc nsattr = "xmlns:" + prefix;
128         if (((Element) node).hasAttribute(nsattr)) {
129         return ((Element) node).getAttribute(nsattr);
130         }
131     }
132
133     return getNamespaceURI(node.getParentNode(), prefix);
134     }
135
136     /**
137      * Returns the namespace URI for the namespace to which the
138      * element belongs.
139      *
140      * @param element The element.
141      * @return The namespace URI associated with the namespace of the
142      * element, or null if no namespace declaration exists for it.
143      */
144     public static String JavaDoc getNamespaceURI(Element element) {
145     String JavaDoc prefix = getPrefix(element);
146     return getNamespaceURI(element, prefix);
147     }
148 }
149
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