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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.cxf.aegis.util;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
import java.util.StringTokenizer;

import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.w3c.dom.Element;

import org.apache.cxf.aegis.DatabindingException;
import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.helpers.JavaUtils;
import org.apache.cxf.staxutils.StaxUtils;

/**
 * Namespace utilities.
 */
public final class NamespaceHelper {
    
    private NamespaceHelper() {
        //utility class
    }
    /**
     * Create a unique namespace uri/prefix combination.
     * 
     * @param nsUri
     * @return The namespace with the specified URI. If one doesn't exist, one
     *         is created.
     */
    public static String getUniquePrefix(Element element, String namespaceURI) {
        String prefix = getPrefix(element, namespaceURI);
        // it is OK to have both namespace URI and prefix be empty. 
        if (prefix == null) {
            if ("".equals(namespaceURI)) {
                return "";
            }
            prefix = DOMUtils.createNamespace(element, namespaceURI);
        }
        return prefix;
    }

    public static String getPrefix(Element element, String namespaceURI) {
        return DOMUtils.getPrefixRecursive(element, namespaceURI);
    }

    public static void getPrefixes(Element element, String namespaceURI, List prefixes) {
        DOMUtils.getPrefixesRecursive(element, namespaceURI, prefixes);
    }

    /**
     * Create a unique namespace uri/prefix combination.
     * 
     * @param nsUri
     * @return The namespace with the specified URI. If one doesn't exist, one
     *         is created.
     * @throws XMLStreamException
     */
    public static String getUniquePrefix(XMLStreamWriter writer, String namespaceURI, boolean declare)
        throws XMLStreamException {
        return getUniquePrefix(writer, namespaceURI, null, declare);
    }
    
    
    /**
     * Make a unique prefix.
     * @param writer target writer.
     * @param namespaceURI namespace
     * @param preferred if there's a proposed prefix (e.g. xsi), here it is.
     * @param declare whether to declare to the stream.
     * @return the prefix.
     * @throws XMLStreamException
     */
    public static String getUniquePrefix(XMLStreamWriter writer, 
                                         String namespaceURI,
                                         String preferred,
                                         boolean declare)
        throws XMLStreamException {
        
        if (preferred != null) {
            String existing = writer.getNamespaceContext().getNamespaceURI(preferred);
            if (namespaceURI.equals(existing)) {
                return preferred;
            }
        }
        String prefix = preferred; 
        if (prefix == null) {
            prefix = writer.getNamespaceContext().getPrefix(namespaceURI);
            if (prefix != null) {
                declare = false;
            }
        }
        
        if (prefix == null) {
            prefix = StaxUtils.getUniquePrefix(writer);
        }

        if (declare) {
            writer.setPrefix(prefix, namespaceURI);
            writer.writeNamespace(prefix, namespaceURI);
        }

        return prefix;
    }

    /**
     * Generates the name of a XML namespace from a given class name and
     * protocol. The returned namespace will take the form
     * protocol://domain, where protocol is the
     * given protocol, and domain the inversed package name of
     * the given class name. 

For instance, if the given class name is * org.codehaus.xfire.services.Echo, and the protocol is * http, the resulting namespace would be * http://services.xfire.codehaus.org. * * @param className the class name * @param protocol the protocol (eg. http) * @return the namespace */ public static String makeNamespaceFromClassName(String className, String protocol) { int index = className.lastIndexOf("."); if (index == -1) { return protocol + "://" + "DefaultNamespace"; } String packageName = className.substring(0, index); StringTokenizer st = new StringTokenizer(packageName, "."); String[] words = new String[st.countTokens()]; for (int i = 0; i < words.length; ++i) { words[i] = st.nextToken(); } StringBuilder sb = new StringBuilder(80); for (int i = words.length - 1; i >= 0; --i) { String word = words[i]; // seperate with dot if (i != words.length - 1) { sb.append('.'); } sb.append(word); } return protocol + "://" + sb.toString(); } /** * Method makePackageName * * @param namespace * @return */ public static String makePackageName(String namespace) { String hostname = null; String path = ""; // get the target namespace of the document try { URL u = new URL(namespace); hostname = u.getHost(); path = u.getPath(); } catch (MalformedURLException e) { if (namespace.indexOf(":") > -1) { hostname = namespace.substring(namespace.indexOf(":") + 1); if (hostname.indexOf("/") > -1) { hostname = hostname.substring(0, hostname.indexOf("/")); } } else { hostname = namespace; } } // if we didn't file a hostname, bail if (hostname == null) { return null; } // convert illegal java identifier hostname = hostname.replace('-', '_'); path = path.replace('-', '_'); // chomp off last forward slash in path, if necessary if ((path.length() > 0) && (path.charAt(path.length() - 1) == '/')) { path = path.substring(0, path.length() - 1); } // tokenize the hostname and reverse it StringTokenizer st = new StringTokenizer(hostname, ".:"); String[] words = new String[st.countTokens()]; for (int i = 0; i < words.length; ++i) { words[i] = st.nextToken(); } StringBuilder sb = new StringBuilder(namespace.length()); for (int i = words.length - 1; i >= 0; --i) { addWordToPackageBuffer(sb, words[i], i == words.length - 1); } // tokenize the path StringTokenizer st2 = new StringTokenizer(path, "/"); while (st2.hasMoreTokens()) { addWordToPackageBuffer(sb, st2.nextToken(), false); } return sb.toString(); } /** * Massage word into a form suitable for use in a Java package * name. Append it to the target string buffer with a . delimiter * iff word is not the first word in the package name. * * @param sb the buffer to append to * @param word the word to append * @param firstWord a flag indicating whether this is the first word */ private static void addWordToPackageBuffer(StringBuilder sb, String word, boolean firstWord) { if (JavaUtils.isJavaKeyword(word)) { word = JavaUtils.makeNonJavaKeyword(word); } // separate with dot after the first word if (!firstWord) { sb.append('.'); } // prefix digits with underscores if (Character.isDigit(word.charAt(0))) { sb.append('_'); } // replace periods with underscores if (word.indexOf('.') != -1) { char[] buf = word.toCharArray(); for (int i = 0; i < word.length(); i++) { if (buf[i] == '.') { buf[i] = '_'; } } word = new String(buf); } sb.append(word); } /** * Reads a QName from the element text. Reader must be positioned at the * start tag. * * @param reader * @return * @throws XMLStreamException */ public static QName readQName(XMLStreamReader reader) throws XMLStreamException { String value = reader.getElementText(); if (value == null) { return null; } int index = value.indexOf(":"); if (index == -1) { return new QName(value); } String prefix = value.substring(0, index); String localName = value.substring(index + 1); String ns = reader.getNamespaceURI(prefix); if (ns == null || localName == null) { throw new DatabindingException("Invalid QName in mapping: " + value); } return new QName(ns, localName, prefix); } public static QName createQName(NamespaceContext nc, String value) { if (value == null) { return null; } int index = value.indexOf(':'); if (index == -1) { return new QName(nc.getNamespaceURI(""), value, ""); } else { String prefix = value.substring(0, index); String localName = value.substring(index + 1); String ns = nc.getNamespaceURI(prefix); return new QName(ns, localName, prefix); } } public static QName createQName(Element e, String value, String defaultNamespace) { if (value == null) { return null; } int index = value.indexOf(":"); if (index == -1) { return new QName(defaultNamespace, value); } String prefix = value.substring(0, index); String localName = value.substring(index + 1); String jNS = DOMUtils.getNamespace(e, prefix); if (jNS == null) { throw new DatabindingException("No namespace was found for prefix: " + prefix); } if (localName == null) { throw new DatabindingException("Invalid QName in mapping: " + value); } return new QName(jNS, localName, prefix); } }





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