// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Text;
using System.Xml;
 
namespace System.Security.Cryptography.Xml
{
    // the central dispatcher for canonicalization writes. not all node classes
    // implement ICanonicalizableNode; so a manual dispatch is sometimes necessary.
    internal static class CanonicalizationDispatcher
    {
        public static void Write(XmlNode node, StringBuilder strBuilder, DocPosition docPos, AncestralNamespaceContextManager anc)
        {
            if (node is ICanonicalizableNode)
            {
                ((ICanonicalizableNode)node).Write(strBuilder, docPos, anc);
            }
            else
            {
                WriteGenericNode(node, strBuilder, docPos, anc);
            }
        }
 
        public static void WriteGenericNode(XmlNode node, StringBuilder strBuilder, DocPosition docPos, AncestralNamespaceContextManager anc)
        {
            if (node is null)
            {
                throw new ArgumentNullException(nameof(node));
            }
 
            XmlNodeList childNodes = node.ChildNodes;
            foreach (XmlNode childNode in childNodes)
            {
                Write(childNode, strBuilder, docPos, anc);
            }
        }
 
        public static void WriteHash(XmlNode node, HashAlgorithm hash, DocPosition docPos, AncestralNamespaceContextManager anc)
        {
            if (node is ICanonicalizableNode)
            {
                ((ICanonicalizableNode)node).WriteHash(hash, docPos, anc);
            }
            else
            {
                WriteHashGenericNode(node, hash, docPos, anc);
            }
        }
 
        public static void WriteHashGenericNode(XmlNode node, HashAlgorithm hash, DocPosition docPos, AncestralNamespaceContextManager anc)
        {
            if (node is null)
            {
                throw new ArgumentNullException(nameof(node));
            }
 
            XmlNodeList childNodes = node.ChildNodes;
            foreach (XmlNode childNode in childNodes)
            {
                WriteHash(childNode, hash, docPos, anc);
            }
        }
    }
}