Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / Dom / XmlCharacterData.cs / 1 / XmlCharacterData.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml { using System.Diagnostics; using System.Text; using System.Xml.XPath; // Provides text-manipulation methods that are used by several classes. public abstract class XmlCharacterData : XmlLinkedNode { string data; //base(doc) will throw exception if doc is null. protected internal XmlCharacterData( string data, XmlDocument doc ): base( doc ) { this.data = data; } // Gets or sets the value of the node. public override String Value { get { return Data;} set { Data = value;} } // Gets or sets the concatenated values of the node and // all its children. public override string InnerText { get { return Value;} set { Value = value;} } // Contains this node's data. public virtual string Data { get { if (data != null) { return data; } else { return String.Empty; } } set { XmlNode parent = ParentNode; XmlNodeChangedEventArgs args = GetEventArgs( this, parent, parent, this.data, value, XmlNodeChangedAction.Change ); if (args != null) BeforeEvent( args ); data = value; if (args != null) AfterEvent( args ); } } // Gets the length of the data, in characters. public virtual int Length { get { if (data != null) { return data.Length; } return 0; } } // Retrieves a substring of the full string from the specified range. public virtual String Substring(int offset, int count) { int len = data != null ? data.Length : 0; if (len > 0) { if (len < (offset + count)) { count = len - offset; } return data.Substring( offset, count ); } return String.Empty; } // Appends the specified string to the end of the character // data of the node. public virtual void AppendData(String strData) { XmlNode parent = ParentNode; int capacity = data != null ? data.Length : 0; if (strData != null) capacity += strData.Length; string newValue = new StringBuilder( capacity ).Append( data ).Append( strData ).ToString(); XmlNodeChangedEventArgs args = GetEventArgs( this, parent, parent, data, newValue, XmlNodeChangedAction.Change ); if (args != null) BeforeEvent( args ); this.data = newValue; if (args != null) AfterEvent( args ); } // Insert the specified string at the specified character offset. public virtual void InsertData(int offset, string strData) { XmlNode parent = ParentNode; int capacity = data != null ? data.Length : 0; if (strData != null) capacity += strData.Length; string newValue = new StringBuilder( capacity ).Append( data ).Insert(offset, strData).ToString(); XmlNodeChangedEventArgs args = GetEventArgs( this, parent, parent, data, newValue, XmlNodeChangedAction.Change ); if (args != null) BeforeEvent( args ); this.data = newValue; if (args != null) AfterEvent( args ); } // Remove a range of characters from the node. public virtual void DeleteData(int offset, int count) { //Debug.Assert(offset >= 0 && offset <= Length); int len = data != null ? data.Length : 0; if (len > 0) { if (len < (offset + count)) { count = Math.Max ( len - offset, 0); } } string newValue = new StringBuilder( data ).Remove(offset, count).ToString(); XmlNode parent = ParentNode; XmlNodeChangedEventArgs args = GetEventArgs( this, parent, parent, data, newValue, XmlNodeChangedAction.Change ); if (args != null) BeforeEvent( args ); this.data = newValue; if (args != null) AfterEvent( args ); } // Replace the specified number of characters starting at the specified offset with the // specified string. public virtual void ReplaceData(int offset, int count, String strData) { //Debug.Assert(offset >= 0 && offset <= Length); int len = data != null ? data.Length : 0; if (len > 0) { if (len < (offset + count)) { count = Math.Max ( len - offset, 0); } } StringBuilder temp = new StringBuilder( data ).Remove( offset, count ); string newValue = temp.Insert( offset, strData ).ToString(); XmlNode parent = ParentNode; XmlNodeChangedEventArgs args = GetEventArgs( this, parent, parent, data, newValue, XmlNodeChangedAction.Change ); if (args != null) BeforeEvent( args ); this.data = newValue; if (args != null) AfterEvent( args ); } internal bool CheckOnData( string data ) { return XmlCharType.Instance.IsOnlyWhitespace( data ); } internal bool DecideXPNodeTypeForTextNodes( XmlNode node, ref XPathNodeType xnt ) { //returns true - if all siblings of the node are processed else returns false. //The reference XPathNodeType argument being passed in is the watermark that //changes according to the siblings nodetype and will contain the correct //nodetype when it returns. Debug.Assert( XmlDocument.IsTextNode( node.NodeType ) || ( node.ParentNode != null && node.ParentNode.NodeType == XmlNodeType.EntityReference ) ); while( node != null ) { switch( node.NodeType ) { case XmlNodeType.Whitespace : break; case XmlNodeType.SignificantWhitespace : xnt = XPathNodeType.SignificantWhitespace; break; case XmlNodeType.Text : case XmlNodeType.CDATA : xnt = XPathNodeType.Text; return false; case XmlNodeType.EntityReference : bool ret = DecideXPNodeTypeForTextNodes( node.FirstChild, ref xnt ); if( !ret ) { return false; } break; default : return false; } node = node.NextSibling; } return true; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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