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package com.sun.org.apache.xerces.internal.util;

import java.util.Iterator;
import java.util.List;
import javax.xml.namespace.NamespaceContext;

Writing a wrapper to re-use most of the namespace functionality
already provided by NamespaceSupport, which implements NamespaceContext
from XNI. It would be good if we can change the XNI NamespaceContext
interface to implement the JAXP NamespaceContext interface.
Note that NamespaceSupport assumes the use of symbols. Since this class
can be exposed to the application, we must intern all Strings before
calling NamespaceSupport methods.
Author:
 Neeraj Bajaj, Santiago PericasGeertsen/**
 * Writing a wrapper to re-use most of the namespace functionality
 * already provided by NamespaceSupport, which implements NamespaceContext
 * from XNI. It would be good if we can change the XNI NamespaceContext
 * interface to implement the JAXP NamespaceContext interface.
 *
 * Note that NamespaceSupport assumes the use of symbols. Since this class
 * can be exposed to the application, we must intern all Strings before
 * calling NamespaceSupport methods.
 *
 * @author  Neeraj Bajaj
 * @author Santiago PericasGeertsen
 *
 */
public class NamespaceContextWrapper implements NamespaceContext {

    private com.sun.org.apache.xerces.internal.xni.NamespaceContext fNamespaceContext;

    public NamespaceContextWrapper(NamespaceSupport namespaceContext) {
        fNamespaceContext = namespaceContext ;
    }

    public String getNamespaceURI(String prefix) {
        if (prefix == null) {
            throw new IllegalArgumentException("Prefix can't be null");
        }
        return fNamespaceContext.getURI(prefix.intern());
    }

    public String getPrefix(String namespaceURI) {
        if (namespaceURI == null) {
            throw new IllegalArgumentException("URI can't be null.");
        }
        return fNamespaceContext.getPrefix(namespaceURI.intern());
    }

    
TODO: Namespace doesn't give information giving multiple prefixes for
the same namespaceURI.
/**
     * TODO: Namespace doesn't give information giving multiple prefixes for
     * the same namespaceURI.
     */
    public Iterator<String> getPrefixes(String namespaceURI) {
        if (namespaceURI == null) {
            throw new IllegalArgumentException("URI can't be null.");
        }
        else {
           List<String> vector =
                ((NamespaceSupport) fNamespaceContext).getPrefixes(namespaceURI.intern());
            return vector.iterator();
        }
    }

    
This method supports all functions in the NamespaceContext utility class
/**
     * This method supports all functions in the NamespaceContext utility class
     */
    public com.sun.org.apache.xerces.internal.xni.NamespaceContext getNamespaceContext() {
        return fNamespaceContext;
    }

}