org.apache.taglibs.standard.tag.common.xml.JSTLXPathNamespaceContext Maven / Gradle / Ivy
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package org.apache.taglibs.standard.tag.common.xml;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import javax.xml.namespace.NamespaceContext;
import javax.xml.XMLConstants;
/**
* Implemenation of XML Namespace context processing given a URI or prefix
*/
public class JSTLXPathNamespaceContext implements NamespaceContext {
//*********************************************************************
// Constructor
/**
* No-arg constructor which would create empty HashMap of namespaces
*/
public JSTLXPathNamespaceContext() {
namespaces = new HashMap();
}
public JSTLXPathNamespaceContext(HashMap nses) {
namespaces = nses;
}
/**
* The context to resolve the prefix from, if the context
* is not given.
*/
HashMap namespaces;
/**
* Get Namespace URI bound to a prefix in the current scope
*
* @param Prefix Parameter
*
* @return Namespace URI bound to prefix
*
* @throws IllegalArgumentException if prefix is null
*/
public String getNamespaceURI(String prefix)
throws IllegalArgumentException {
// p("[getNamespaceURI] prefix: " + prefix);
if (prefix == null) {
throw new IllegalArgumentException("Cannot get Namespace URI for null prefix");
}
if (prefix.equals(XMLConstants.XML_NS_PREFIX)) {
return XMLConstants.XML_NS_URI;
}
if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE)) {
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
}
String namespaceURI = (String)namespaces.get(prefix);
// p("[getNamespaceURI] namespaceURI: " + namespaceURI);
if (namespaceURI != null) {
return namespaceURI;
}
return XMLConstants.NULL_NS_URI;
}
/**
* Get Prefix bound to Namespace URI in the current scope
*
* @param Namespace URI
*
* @return Prefix bound to Namespace URI
*
* @throws IllegalArgumentException if Namespace URI is null
*/
public String getPrefix(String namespaceURI) {
// p("[getPrefix] namespaceURI: " + namespaceURI);
if (namespaceURI == null) {
throw new IllegalArgumentException("Cannot get prefix for null NamespaceURI");
}
if (namespaceURI.equals(XMLConstants.XML_NS_URI)) {
return XMLConstants.XML_NS_PREFIX;
}
if (namespaceURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
return XMLConstants.XMLNS_ATTRIBUTE;
}
Iterator iter = namespaces.keySet().iterator();
while (iter.hasNext()) {
String key = (String)iter.next();
String value = (String)namespaces.get(key);
if (value.equals(namespaceURI)) {
// p("[getPrefix] value: " + value);
return value;
}
}
// p("[getPrefix] returning null");
return null;
}
/**
* Get all Prefixes bound to Namespace URI in the current scope
*
* @param Namespace URI
*
* @return Iterator of Prefixes bound to Namespace URI
*
* @throws IllegalArgumentException if Namespace URI is null
*/
public Iterator getPrefixes(String namespaceURI) {
// p("[getPrefixes] namespaceURI: " + namespaceURI);
if (namespaceURI == null) {
throw new IllegalArgumentException("Cannot get prefix for null NamespaceURI");
}
if (namespaceURI.equals(XMLConstants.XML_NS_URI)) {
return Arrays.asList(new String[] {XMLConstants.XML_NS_PREFIX}).iterator();
}
if (namespaceURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) {
return Arrays.asList(new String[] {XMLConstants.XMLNS_ATTRIBUTE}).iterator();
}
ArrayList prefixList = new ArrayList();
Iterator iter = namespaces.keySet().iterator();
while (iter.hasNext()) {
String key = (String)iter.next();
String value = (String)namespaces.get(key);
if (value.equals(namespaceURI)) {
prefixList.add(key);
}
}
// p("[getPrefixes] prefixList: " + prefixList);
return prefixList.iterator();
}
/**
* Populate map of Prefix and NameSpace URI's entries
*/
protected void addNamespace(String prefix, String uri ) {
namespaces.put(prefix, uri );
}
//*********************************************************************
// Utility methods
private static void p(String s) {
System.out.println("[JSTLXPathNameContext] " + s);
}
}