Set the value to the Element
#region License and Copyright
/*
* Dotnet Commons Xml
*
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place,
* Suite 330,
* Boston,
* MA 02111-1307
* USA
*
*/
#endregion
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using System.Xml.Xsl;
using System.Xml.Serialization;
//using Dotnet.Commons.Reflection;
namespace Dotnet.Commons.Xml
{
///
/// <summary>
/// This utility class contains wrapper functions that help to ease the handling and
/// manipulation of Xml documents, such as adding an element, adding an attribute
/// to an element, copying and cloning of nodes, etc.
///
/// </summary>
///
public abstract class XmlUtils
{
/// -----------------------------------------------------------
/// <summary>
/// Set the value to the Element
/// </summary>
/// <param name="node">the node to set the value </param>
/// <param name="nodeValue">Value to set</param>
/// <exception cref="XmlException">
/// Thrown if XmlNode is not an element or node is
/// not a text node (no child nodes)
/// </exception>
/// -----------------------------------------------------------
public static void SetNodeValue( XmlNode node, object nodeValue )
{
if (node == null)
throw new ArgumentNullException("node");
if (node.NodeType != XmlNodeType.Element)
throw new XmlException("Node is not an element.");
if (node.ChildNodes.Count > 0)
throw new XmlException("Node is not a text node as it has child nodes.");
node.AppendChild(node.OwnerDocument.CreateTextNode(nodeValue.ToString()));
}
/// ------------------------------------------------------------------
/// <summary>
/// Set the value to a node
/// </summary>
/// <param name="parentNode">parentNode to start search from</param>
/// <param name="xpath">XPath to the child node</param>
/// <param name="nodeValue">the new value to set to</param>
/// <exception cref="ArgumentNullException">Thrown if parentNode is null</exception>
/// <exception cref="ArgumentException">Thrown if no text node is found at the xpath provided.</exception>
/// <exception cref="XmlException">Thrown if node to set the value is not a text node (ie. no child nodes)</exception>
/// ------------------------------------------------------------------
public static void SetNodeValue(XmlNode parentNode,
string xpath,
object nodeValue)
{
if (parentNode == null)
throw new ArgumentNullException("parentNode");
XmlNode childNode = parentNode.SelectSingleNode(xpath);
if(childNode == null)
throw new ArgumentException(String.Format("No node is not found at the path specified '{0}'", xpath), "xpath");
if (childNode.ChildNodes.Count > 0)
throw new XmlException("Child node is not a text node as it has child nodes.");
childNode.InnerText = nodeValue.ToString();
}
/// -----------------------------------------------------------
/// <summary>
/// Set a blog of binary data encoded with Base64 to an XML element.
/// </summary>
/// <param name="node">the node to set the blog of data</param>
/// <param name="byteArray">an array of bytes containing the actual data</param>
/// <exception cref="XmlException">Thrown if XmlNode is not an element or
/// node is not a text node (no child nodes)</exception>
/// -----------------------------------------------------------
public static void SetNodeBase64BinaryValue( XmlNode node, byte[] byteArray )
{
if (node.NodeType != XmlNodeType.Element)
throw new XmlException("Node is not an element.");
if (node.ChildNodes.Count > 0)
throw new XmlException("Node is not a text node as it has child nodes.");
// Convet byte array into Base64 string
string encodedData = Convert.ToBase64String(byteArray);
node.AppendChild(node.OwnerDocument.CreateTextNode(encodedData));
}
/// -----------------------------------------------------------
/// <summary>
/// Encode a value to Base64 and set it to the node.
/// </summary>
/// <param name="node">the node to set the value</param>
/// <param name="value">value to set to the node</param>
/// <exception cref="XmlException">Thrown if XmlNode is not an element
/// or node is not a text node (no child nodes)</exception>
/// -----------------------------------------------------------
public static void SetNodeBase64EncodedValue( XmlNode node, object value)
{
if (value is byte[])
SetNodeBase64BinaryValue(node, (byte[])value);
if (node.NodeType != XmlNodeType.Element)
throw new XmlException("Node is not an element.");
if (node.ChildNodes.Count > 0)
throw new XmlException("Node is not a text node as it has child nodes.");
// Convet byte array into Base64 string
ASCIIEncoding encoding = new ASCIIEncoding();
byte[] bytes = encoding.GetBytes(value.ToString());
SetNodeBase64BinaryValue(node, bytes);
}
}
}
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