/*
 * Copyright (c) 2007, 2009, Oracle and its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

/*
 * $Id: XmlUtil.java 51075 2003-03-27 10:44:21Z lschwenk $
 */

package com.sun.ts.tests.jaxws.wsa.common;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactory;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.EntityReference;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;

import java.net.URL;
import java.util.Enumeration;
import javax.xml.ws.WebServiceException;
import javax.xml.namespace.QName;

public class XmlUtil {

    public static String getPrefix(String s) {
        int i = s.indexOf(':');
        if (i == -1)
            return null;
        return s.substring(0, i);
    }

    public static String getLocalPart(String s) {
        int i = s.indexOf(':');
        if (i == -1)
            return s;
        return s.substring(i + 1);
    }



    public static String getAttributeOrNull(Element e, String name) {
        Attr a = e.getAttributeNode(name);
        if (a == null)
            return null;
        return a.getValue();
    }

    public static String getAttributeNSOrNull(
        Element e,
        String name,
        String nsURI) {
        Attr a = e.getAttributeNodeNS(nsURI, name);
        if (a == null)
            return null;
        return a.getValue();
    }

    public static String getAttributeNSOrNull(
        Element e,
        QName name) {
        Attr a = e.getAttributeNodeNS(name.getNamespaceURI(), name.getLocalPart());
        if (a == null)
            return null;
        return a.getValue();
    }

    public static Iterator getAllChildren(Element element) {
        return new NodeListIterator(element.getChildNodes());
    }

    public static Iterator getAllAttributes(Element element) {
        return new NamedNodeMapIterator(element.getAttributes());
    }

    public static List<String> parseTokenList(String tokenList) {
        List<String> result = new ArrayList<String>();
        StringTokenizer tokenizer = new StringTokenizer(tokenList, " ");
        while (tokenizer.hasMoreTokens()) {
            result.add(tokenizer.nextToken());
        }
        return result;
    }

    public static String getTextForNode(Node node) {
        StringBuffer sb = new StringBuffer();

        NodeList children = node.getChildNodes();
        if (children.getLength() == 0)
            return null;

        for (int i = 0; i < children.getLength(); ++i) {
            Node n = children.item(i);

            if (n instanceof Text)
                sb.append(n.getNodeValue());
            else if (n instanceof EntityReference) {
                String s = getTextForNode(n);
                if (s == null)
                    return null;
                else
                    sb.append(s);
            } else
                return null;
        }

        return sb.toString();
    }

    public static InputStream getUTF8Stream(String s) {
        try {
            ByteArrayBuffer bab = new ByteArrayBuffer();
            Writer w = new OutputStreamWriter(bab, "utf-8");
            w.write(s);
            w.close();
            return bab.newInputStream();
        } catch (IOException e) {
            throw new RuntimeException("should not happen");
        }
    }

    static final TransformerFactory transformerFactory = TransformerFactory.newInstance();

    public static Transformer newTransformer() {
        try {
            return transformerFactory.newTransformer();
        } catch (TransformerConfigurationException tex) {
            throw new IllegalStateException("Unable to create a JAXP transformer");
        }
    }
}
