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//------------------------------------------------------------------------------
// <copyright file="XmlCharacterData.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
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 :
if (!DecideXPNodeTypeForTextNodes(node.FirstChild, ref xnt)) {
return false;
}
break;
default :
return false;
}
node = node.NextSibling;
}
return true;
}
}
}
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