XmlCharacterData.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Xml / System / Xml / Dom / XmlCharacterData.cs / 1305376 / 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 { 
            [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")]
            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 :
                    if (!DecideXPNodeTypeForTextNodes(node.FirstChild, ref xnt)) { 
                        return false;
                    }
                    break;
                default : 
                    return false;
                } 
                node = node.NextSibling; 
            }
            return true; 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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