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/*
 * Fabric3
 * Copyright (c) 2009-2013 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
*/
package org.fabric3.fabric.instantiator.component;

import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

/**
 *
 */
public class NamespaceHelper {

    /**
     * Copies namespace attributes from a source, recursing its parents, to target node.
     *
     * @param source the source node
     * @param target the target node
     */
    public static void copyNamespaces(Node source, Node target) {
        if (!(target instanceof Element)) {
            return;
        }
        Element targetElement = (Element) target;
        Node parent = source.getParentNode();
        while (parent != null) {
            copyNamespaces(parent, targetElement);
            parent = parent.getParentNode();
        }
        NamedNodeMap attributes = source.getAttributes();
        if (attributes == null || attributes.getLength() == 0) {
            // no attributes
            return;
        }
        for (int i = 0; i < attributes.getLength(); i++) {
            Node node = attributes.item(i);
            if (!(node instanceof Attr)) {
                continue;
            }
            Attr attr = (Attr) node;
            String prefix = attr.getPrefix();

            // check the schema ns
            if ((prefix == null || prefix.length() == 0) && !"xmlns".equals(attr.getLocalName())) {
                // not a default namespace
                continue;
            } else if (!"xmlns".equals(prefix)) {
                // not a namespace declaration
                continue;
            }
            targetElement.setAttributeNS(attr.getNamespaceURI(), attr.getName(), attr.getNodeValue());
        }
    }
}