001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.servicemix.jbi.util;
018    
019    import java.util.Collection;
020    import java.util.Iterator;
021    
022    import javax.xml.namespace.QName;
023    
024    import org.w3c.dom.Attr;
025    import org.w3c.dom.Element;
026    
027    /**
028     * Utilities for converting QNames into different representations
029     * 
030     * @author Alex Boisvert
031     * @version $Revision: 1.5 $
032     * @since 3.0
033     */
034    public final class QNameUtil {
035        
036        private QNameUtil() {
037        }
038    
039        /**
040         * Convert QName to the Clark notation, e.g., {namespace}localName
041         */
042        public static String toString(QName qname) {
043            if (qname.getNamespaceURI() == null) {
044                return "{}" + qname.getLocalPart();
045            } else {
046                return "{" + qname.getNamespaceURI() + "}" + qname.getLocalPart();
047            }
048        }
049    
050        /**
051         * Convert QName to the Clark notation, e.g., {namespace}localName
052         */
053        public static String toString(Element element) {
054            if (element.getNamespaceURI() == null) {
055                return "{}" + element.getLocalName();
056            } else {
057                return "{" + element.getNamespaceURI() + "}" + element.getLocalName();
058            }
059        }
060    
061        /**
062         * Convert QName to the Clark notation, e.g., {namespace}localName
063         */
064        public static String toString(Attr attr) {
065            if (attr.getNamespaceURI() == null) {
066                return "{}" + attr.getLocalName();
067            } else {
068                return "{" + attr.getNamespaceURI() + "}" + attr.getLocalName();
069            }
070        }
071    
072        public static String toString(Collection collection) {
073            StringBuffer buf = new StringBuffer();
074            Iterator iter = collection.iterator();
075            while (iter.hasNext()) {
076                QName qname = (QName) iter.next();
077                buf.append(toString(qname));
078                if (iter.hasNext()) {
079                    buf.append(", ");
080                }
081            }
082            return buf.toString();
083        }
084        
085        /**
086         * Convert a String back into a QName following the Clark notation
087         */
088        public static QName parse(String name) {
089            int pos = name.indexOf('}');
090            if (name.startsWith("{") && pos > 0) {
091                String ns = name.substring(1, pos);
092                String lname = name.substring(pos + 1, name.length());
093                return new QName(ns, lname);
094            }
095            return null;
096        }
097    
098    }