com.epam.deltix.util.xml.SimplestNamespaceContext Maven / Gradle / Ivy

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/*
 * Copyright 2021 EPAM Systems, Inc
 *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. Licensed under the Apache License,
 * Version 2.0 (the "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.epam.deltix.util.xml;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;


/** 
 * Trivial implementation of NamespaceContext that supports the following XML namespaces:
 * 
 * xmlns:xml=http://www.w3.org/XML/1998/namespace
 * 
xmlns:xmlnl=http://www.w3.org/2000/xmlns/
 * 
xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance
 * 
 */
public class SimplestNamespaceContext implements NamespaceContext {

	private static final String XSI_PREFIX = "xsi";


    public String   getNamespaceURI (String prefix) {
    	if (prefix == null)
            throw new IllegalArgumentException ("null prefix");

    	if (prefix.equals(XMLConstants.XML_NS_PREFIX)) // "xml"
            return XMLConstants.XML_NS_URI;
        
        if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE)) // "xmlns"
            return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;

        if (prefix.equals(XSI_PREFIX)) // "xsi"
            return XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI;

        return XMLConstants.NULL_NS_URI;
    }

    public String getPrefix(String namespaceURI) {
        if (namespaceURI == null)
            throw new IllegalArgumentException ("null uri");
        
        if (namespaceURI.equals (XMLConstants.XML_NS_URI)) // xml
            return XMLConstants.XML_NS_PREFIX;
        
        if (namespaceURI.equals (XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) // xmlns
            return XMLConstants.XMLNS_ATTRIBUTE;

        if (namespaceURI.equals (XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI)) // xmlns
            return XSI_PREFIX;

        return null;
    }

    
    public Iterator getPrefixes(String namespaceURI) {
        if (namespaceURI == null)
           throw new IllegalArgumentException ("null uri");

        List result = new LinkedList ();
        String prefix = null;
        if (namespaceURI.equals (XMLConstants.XML_NS_URI)) // xml
        	prefix = XMLConstants.XML_NS_PREFIX;
        else
        if (namespaceURI.equals (XMLConstants.XMLNS_ATTRIBUTE_NS_URI)) // xmlns
            prefix = XMLConstants.XMLNS_ATTRIBUTE;
        else
        if (namespaceURI.equals (XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI)) // xmlns
        	prefix = XSI_PREFIX;
        
        if (prefix != null)
            result.add (prefix);
        
        return result.iterator();
    }    




}