IfAction.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 / XmlUtils / System / Xml / Xsl / XsltOld / IfAction.cs / 1305376 / IfAction.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace System.Xml.Xsl.XsltOld { 
    using Res = System.Xml.Utils.Res;
    using System; 
    using System.Diagnostics;
    using System.Xml;
    using System.Xml.XPath;
 
    internal class IfAction : ContainerAction {
        internal enum ConditionType { 
            ConditionIf, 
            ConditionWhen,
            ConditionOtherwise 
        }

        private ConditionType   type;
        private int             testKey = Compiler.InvalidQueryKey; 

        internal IfAction(ConditionType type) { 
            this.type = type; 
        }
 
        internal override void Compile(Compiler compiler) {
            CompileAttributes(compiler);
            if (this.type != ConditionType.ConditionOtherwise) {
                CheckRequiredAttribute(compiler, this.testKey != Compiler.InvalidQueryKey, "test"); 
            }
 
            if (compiler.Recurse()) { 
                CompileTemplate(compiler);
                compiler.ToParent(); 
            }
        }

        internal override bool CompileAttribute(Compiler compiler) { 
            string name   = compiler.Input.LocalName;
            string value  = compiler.Input.Value; 
            if (Ref.Equal(name, compiler.Atoms.Test)) { 
                if (this.type == ConditionType.ConditionOtherwise) {
                    return false; 
                }
                this.testKey = compiler.AddBooleanQuery(value);
            }
            else { 
                return false;
            } 
 
            return true;
        } 

        internal override void Execute(Processor processor, ActionFrame frame) {
            Debug.Assert(processor != null && frame != null);
 
            switch (frame.State) {
            case Initialized: 
                if (this.type == ConditionType.ConditionIf || this.type == ConditionType.ConditionWhen) { 
                    Debug.Assert(this.testKey != Compiler.InvalidQueryKey);
                    bool value = processor.EvaluateBoolean(frame, this.testKey); 
                    if (value == false) {
                        frame.Finished();
                        break;
                    } 
                }
 
                processor.PushActionFrame(frame); 
                frame.State = ProcessingChildren;
                break;                              // Allow children to run 

            case ProcessingChildren:
                if (this.type == ConditionType.ConditionWhen ||this.type == ConditionType.ConditionOtherwise) {
                    Debug.Assert(frame.Container != null); 
                    frame.Exit();
                } 
 
                frame.Finished();
                break; 

            default:
                Debug.Fail("Invalid IfAction execution state");
        		break; 
            }
        } 
    } 
}

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

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