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/*
 * Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package testutil;

import org.w3c.dom.*;

/**
 * @author WS Development Team
 */
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 getTextForNode(Node node) {
        StringBuilder sb = new StringBuilder();

        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();
    }

    /**
     * Gets the first element child.
     */
    public static Element getFirstElementChild(Node parent) {
        for (Node n = parent.getFirstChild(); n != null; n = n.getNextSibling()) {
            if (n.getNodeType() == Node.ELEMENT_NODE) {
                return (Element) n;
            }
        }
        return null;
    }
}