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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
/*
* Copyright (C) 2012 United States Government as represented by the Administrator of the
* National Aeronautics and Space Administration.
* All Rights Reserved.
*/
package gov.nasa.worldwind.util;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import java.util.*;
/**
* BasicNamespaceContext provides a mutable implementation of the {@link javax.xml.namespace.NamespaceContext}
* interface.
*
* @author dcollins
* @version $Id: BasicNamespaceContext.java 1171 2013-02-11 21:45:02Z dcollins $
*/
public class BasicNamespaceContext implements NamespaceContext
{
public static final String XLINK_NS_PREFIX = "xlink";
public static final String XLINK_NS_URI = "http://www.w3.org/1999/xlink";
private Map urisByPrefix = new HashMap();
private Map> prefixesByURI = new HashMap>();
/**
* Sole constructor for BasicNamespaceContext. This configures the following namespaces:
* Prefix URI xml http://www.w3.org/XML/1998/namespace xmlns http://www.w3.org/2000/xmlns/ xlink http://www.w3.org/1999/xlink
*/
public BasicNamespaceContext()
{
// Configure the default xml and xmlns namespaces according to the documentation of the NamespaceContext
// interface.
this.addNamespace(XMLConstants.XML_NS_PREFIX, XMLConstants.XML_NS_URI);
this.addNamespace(XMLConstants.XMLNS_ATTRIBUTE, XMLConstants.XMLNS_ATTRIBUTE_NS_URI);
this.addNamespace(XLINK_NS_PREFIX, XLINK_NS_URI);
}
/**
* Adds a namepsace binding to this XML namespace context. The specified URI is bound to the specified prefix.
*
* @param prefix the namespace prefix.
* @param namespaceURI the namespace URI.
*
* @throws IllegalArgumentException if either the prefix or the namepsace URI are null.
*/
public synchronized void addNamespace(String prefix, String namespaceURI)
{
if (prefix == null)
{
String message = Logging.getMessage("nullValue.PrefixIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (namespaceURI == null)
{
String message = Logging.getMessage("nullValue.NamespaceURIIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
this.urisByPrefix.put(prefix, namespaceURI);
if (this.prefixesByURI.containsKey(namespaceURI))
{
this.prefixesByURI.get(namespaceURI).add(prefix);
}
else
{
Set set = new HashSet();
set.add(prefix);
this.prefixesByURI.put(namespaceURI, set);
}
}
/** {@inheritDoc} */
public String getNamespaceURI(String prefix)
{
if (prefix == null)
{
String message = Logging.getMessage("nullValue.PrefixIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (this.urisByPrefix.containsKey(prefix))
{
return this.urisByPrefix.get(prefix);
}
else
{
return XMLConstants.NULL_NS_URI;
}
}
/** {@inheritDoc} */
public String getPrefix(String namespaceURI)
{
if (namespaceURI == null)
{
String message = Logging.getMessage("nullValue.NamespaceURIIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
return (String) this.getPrefixes(namespaceURI).next();
}
/** {@inheritDoc} */
public Iterator getPrefixes(String namespaceURI)
{
if (namespaceURI == null)
{
String message = Logging.getMessage("nullValue.NamespaceURIIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
if (this.prefixesByURI.containsKey(namespaceURI))
{
return Collections.unmodifiableSet(this.prefixesByURI.get(namespaceURI)).iterator();
}
else
{
return Collections.EMPTY_SET.iterator();
}
}
}