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/*
 * Copyright 2001-2011 The Apache Software Foundation. Licensed 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.red5.io.utils;

import java.io.PrintWriter;
import java.io.Writer;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Attr;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * This class is a utility to serialize a DOM node as XML. This class uses the DOM Level 2 APIs. The main difference between this class and DOMWriter is that this class generates and prints out namespace declarations.
 * 
 * @author Matthew J. Duftler ([email protected])
 * @author Joseph Kesselman
 */
public class DOM2Writer {

    private static Logger logger = LoggerFactory.getLogger(DOM2Writer.class);

    /**
     * Serialize this node into the writer as XML.
     * 
     * @param writer
     *            Writer object
     * @param node
     *            DOM node
     */
    public static void serializeAsXML(Node node, Writer writer) {
        PrintWriter out = new PrintWriter(writer);
        print(node, out);
        out.flush();
    }

    /**
     * Dumps DOM node
     * 
     * @param node
     *            Node to dump
     * @param out
     *            Writer object
     */
    private static void print(Node node, PrintWriter out) {
        if (node == null) {
            return;
        }

        boolean hasChildren = false;
        int type = node.getNodeType();
        NodeList children = null;
        switch (type) {
            case Node.DOCUMENT_NODE:
                children = node.getChildNodes();
                if (children != null) {
                    int numChildren = children.getLength();
                    for (int i = 0; i < numChildren; i++) {
                        print(children.item(i), out);
                    }
                }
                break;
            case Node.ELEMENT_NODE:
                out.print('<');
                out.print(node.getNodeName());
                if (node.hasAttributes()) {
                    NamedNodeMap attrs = node.getAttributes();
                    int len = (attrs != null) ? attrs.getLength() : 0;
                    for (int a = 0; a < len; a++) {
                        Attr attr = (Attr) attrs.item(a);
                        out.print(' ');
                        out.print(attr.getNodeName());
                        out.print("=\"");
                        out.print(attr.getValue());
                        out.print('\"');
                    }
                }
                children = node.getChildNodes();
                if (children != null) {
                    int numChildren = children.getLength();
                    hasChildren = (numChildren > 0);
                    if (hasChildren) {
                        out.print('>');
                    }
                    for (int i = 0; i < numChildren; i++) {
                        print(children.item(i), out);
                    }
                } else {
                    hasChildren = false;
                }
                if (!hasChildren) {
                    out.print("/>");
                }
                break;
            case Node.ENTITY_REFERENCE_NODE:
                out.print('&');
                out.print(node.getNodeName());
                out.print(';');
                break;
            case Node.CDATA_SECTION_NODE:
                out.print("");
                break;
            case Node.TEXT_NODE:
                out.print(node.getNodeValue());
                break;
            default:
                if (logger.isDebugEnabled()) {
                    logger.debug("Unknown type: " + type);
                }
        }
        if (type == Node.ELEMENT_NODE && hasChildren) {
            out.print("');
            hasChildren = false;
        }
    }
}