//------------------------------------------------------------------------------
// <copyright file="XmlProcessingInstruction.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>                                                                
// <owner current="true" primary="true">[....]</owner>
//------------------------------------------------------------------------------

namespace System.Xml {
    using System;
    using System.IO;
    using System.Diagnostics;
    using System.Text;
    using System.Xml.XPath;

    // Represents a processing instruction, which XML defines to keep
    // processor-specific information in the text of the document.
    public class XmlProcessingInstruction : XmlLinkedNode {
        string target;
        string data;

        protected internal XmlProcessingInstruction( string target, string data, XmlDocument doc ) : base( doc ) {
            this.target = target;
            this.data = data;
        }

        // Gets the name of the node.
        public override String Name {
            get {
                if (target != null)
                    return target;
                return String.Empty;
            }
        }

        // Gets the name of the current node without the namespace prefix.
        public override string LocalName {
            get { return Name;}
        }

        // Gets or sets the value of the node.
        public override String Value {
            get { return data;}
            set { Data = value; } //use Data instead of data so that event will be fired
        }

        // Gets the target of the processing instruction.
        public String Target {
            get { return target;}
        }

        // Gets or sets the content of processing instruction,
        // excluding the target.
        public String Data {
            get { return data;}
            set { 
                XmlNode parent = ParentNode;
                XmlNodeChangedEventArgs args = GetEventArgs( this, parent, parent, data, value, XmlNodeChangedAction.Change );
                if (args != null)
                    BeforeEvent( args );
                data = value;
                if (args != null)
                    AfterEvent( args );
            }
        }

        // Gets or sets the concatenated values of the node and
        // all its children.
        public override string InnerText { 
            get { return data;}
            set { Data = value; } //use Data instead of data so that change event will be fired
        }

        // Gets the type of the current node.
        public override XmlNodeType NodeType {
            get { return XmlNodeType.ProcessingInstruction;}
        }

        // Creates a duplicate of this node.
        public override XmlNode CloneNode(bool deep) {
            Debug.Assert( OwnerDocument != null );
            return OwnerDocument.CreateProcessingInstruction( target, data );
        }

        // Saves the node to the specified XmlWriter.
        public override void WriteTo(XmlWriter w) {
            w.WriteProcessingInstruction(target, data);
        }

        // Saves all the children of the node to the specified XmlWriter.
        public override void WriteContentTo(XmlWriter w) {
            // Intentionally do nothing
        }

        internal override string XPLocalName { get { return Name; } }
        internal override XPathNodeType XPNodeType { get { return XPathNodeType.ProcessingInstruction; } }
    }
}