ValidationHelpers.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Activities / Common / ValidationHelpers.cs / 1305376 / ValidationHelpers.cs
                        
                        
                            // Copyright (c) Microsoft Corporation. All rights reserved. 
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
// WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. 
// THE ENTIRE RISK OF USE OR RESULTS IN CONNECTION WITH THE USE OF THIS CODE
// AND INFORMATION REMAINS WITH THE USER. 
// 

/********************************************************************** 
 * NOTE: A copy of this file exists at: WF\Common\Shared
 * The two files must be kept in [....].  Any change made here must also
 * be made to WF\Common\Shared\ValidationHelpers.cs
*********************************************************************/ 
namespace System.Workflow.Activities.Common
{ 
    #region Imports 

    using System; 
    using System.Diagnostics;
    using System.Collections;
    using System.Collections.Generic;
    using System.Reflection; 
    using System.CodeDom.Compiler;
    using System.Workflow.ComponentModel.Design; 
    using System.Workflow.ComponentModel.Compiler; 
    using System.Collections.Specialized;
    using System.ComponentModel.Design.Serialization; 
    using System.Workflow.ComponentModel;
    #endregion

    internal static class ValidationHelpers 
    {
        #region Validation & helpers for ID and Type 
 
        internal static void ValidateIdentifier(IServiceProvider serviceProvider, string identifier)
        { 
            if (serviceProvider == null)
                throw new ArgumentNullException("serviceProvider");

            SupportedLanguages language = CompilerHelpers.GetSupportedLanguage(serviceProvider); 
            CodeDomProvider provider = CompilerHelpers.GetCodeDomProvider(language);
            if (language == SupportedLanguages.CSharp && identifier.StartsWith("@", StringComparison.Ordinal) || 
                language == SupportedLanguages.VB && identifier.StartsWith("[", StringComparison.Ordinal) && identifier.EndsWith("]", StringComparison.Ordinal) || 
                !provider.IsValidIdentifier(identifier))
            { 
                throw new Exception(SR.GetString(SR.Error_InvalidLanguageIdentifier, identifier));
            }
        }
 
        internal static ValidationError ValidateIdentifier(string propName, IServiceProvider context, string identifier)
        { 
            if (context == null) 
                throw new ArgumentNullException("context");
 
            ValidationError error = null;
            if (identifier == null || identifier.Length == 0)
                error = new ValidationError(SR.GetString(SR.Error_PropertyNotSet, propName), ErrorNumbers.Error_PropertyNotSet);
            else 
            {
                try 
                { 
                    ValidationHelpers.ValidateIdentifier(context, identifier);
                } 
                catch(Exception e)
                {
                    error = new ValidationError(SR.GetString(SR.Error_InvalidIdentifier, propName, e.Message), ErrorNumbers.Error_InvalidIdentifier);
                } 
            }
            if(error != null) 
                error.PropertyName = propName; 
            return error;
        } 

        internal static ValidationError ValidateNameProperty(string propName, IServiceProvider context, string identifier)
        {
            if (context == null) 
                throw new ArgumentNullException("context");
 
            ValidationError error = null; 
            if (identifier == null || identifier.Length == 0)
                error = new ValidationError(SR.GetString(SR.Error_PropertyNotSet, propName), ErrorNumbers.Error_PropertyNotSet); 
            else
            {
                SupportedLanguages language = CompilerHelpers.GetSupportedLanguage(context);
                CodeDomProvider provider = CompilerHelpers.GetCodeDomProvider(language); 

                if (language == SupportedLanguages.CSharp && identifier.StartsWith("@", StringComparison.Ordinal) || 
                    language == SupportedLanguages.VB && identifier.StartsWith("[", StringComparison.Ordinal) && identifier.EndsWith("]", StringComparison.Ordinal) || 
                    !provider.IsValidIdentifier(provider.CreateEscapedIdentifier(identifier)))
                { 
                    error = new ValidationError(SR.GetString(SR.Error_InvalidIdentifier, propName, SR.GetString(SR.Error_InvalidLanguageIdentifier, identifier)), ErrorNumbers.Error_InvalidIdentifier);
                }
            }
            if (error != null) 
                error.PropertyName = propName;
            return error; 
        } 

        internal static ValidationErrorCollection ValidateUniqueIdentifiers(Activity rootActivity) 
        {
            if (rootActivity == null)
                throw new ArgumentNullException("rootActivity");
 
            Hashtable identifiers = new Hashtable();
            ValidationErrorCollection validationErrors = new ValidationErrorCollection(); 
            Queue activities = new Queue(); 
            activities.Enqueue(rootActivity);
            while (activities.Count > 0) 
            {
                Activity activity = (Activity)activities.Dequeue();
                if (activity.Enabled)
                { 
                    if (identifiers.ContainsKey(activity.QualifiedName))
                    { 
                        ValidationError duplicateError = new ValidationError(SR.GetString(SR.Error_DuplicatedActivityID, activity.QualifiedName), ErrorNumbers.Error_DuplicatedActivityID); 
                        duplicateError.PropertyName = "Name";
                        duplicateError.UserData[typeof(Activity)] = activity; 
                        validationErrors.Add(duplicateError);
                    }
                    else
                        identifiers.Add(activity.QualifiedName, activity); 

                    if (activity is CompositeActivity && ((activity.Parent == null) || !Helpers.IsCustomActivity(activity as CompositeActivity))) 
                    { 
                        foreach (Activity child in Helpers.GetAllEnabledActivities((CompositeActivity)activity))
                            activities.Enqueue(child); 
                    }
                }
            }
 
            return validationErrors;
 
        } 
        #endregion
 
        #region Validation for Activity Ref order

        internal static bool IsActivitySourceInOrder(Activity request, Activity response)
        { 
            if (request.Parent == null)
                return true; 
            List responsePath = new List(); 
            responsePath.Add(response);
            Activity responseParent = response is CompositeActivity ? (CompositeActivity)response : response.Parent; 
            while (responseParent != null)
            {
                responsePath.Add(responseParent);
                responseParent = responseParent.Parent; 
            }
 
            Activity requestChild = request; 
            CompositeActivity requestParent = request is CompositeActivity ? (CompositeActivity)request : request.Parent;
            while (requestParent != null && !responsePath.Contains(requestParent)) 
            {
                requestChild = requestParent;
                requestParent = requestParent.Parent;
            } 

            if (requestParent == requestChild) 
                return true; 

            bool incorrectOrder = false; 
            int index = (responsePath.IndexOf(requestParent) - 1);
            index = (index < 0) ? 0 : index;//sometimes parent gets added to the collection twice which causes index to be -1
            Activity responseChild = responsePath[index];
 
            if (requestParent == null || Helpers.IsAlternateFlowActivity(requestChild) || Helpers.IsAlternateFlowActivity(responseChild))
                incorrectOrder = true; 
            else 
            {
                for (int i = 0; i < requestParent.EnabledActivities.Count; i++) 
                {
                    if (requestParent.EnabledActivities[i] == requestChild)
                        break;
                    else if (requestParent.EnabledActivities[i] == responseChild) 
                    {
                        incorrectOrder = true; 
                        break; 
                    }
                } 
            }
            return !incorrectOrder;
        }
 
        #endregion
 
        internal static ValidationErrorCollection ValidateObject(ValidationManager manager, object obj) 
        {
            ValidationErrorCollection errors = new ValidationErrorCollection(); 
            if (obj == null)
                return errors;

            Type objType = obj.GetType(); 
            if (!objType.IsPrimitive && (objType != typeof(string)))
            { 
                bool removeValidatedObjectCollection = false; 
                Dictionary validatedObjects = manager.Context[typeof(Dictionary)] as Dictionary;
                if (validatedObjects == null) 
                {
                    validatedObjects = new Dictionary();
                    manager.Context.Push(validatedObjects);
                    removeValidatedObjectCollection = true; 
                }
 
                try 
                {
                    if (!validatedObjects.ContainsKey(obj.GetHashCode())) 
                    {
                        validatedObjects.Add(obj.GetHashCode(), obj);
                        try
                        { 
                            Validator[] validators = manager.GetValidators(objType);
                            foreach (Validator validator in validators) 
                                errors.AddRange(validator.Validate(manager, obj)); 
                        }
                        finally 
                        {
                            validatedObjects.Remove(obj.GetHashCode());
                        }
                    } 
                }
                finally 
                { 
                    if (removeValidatedObjectCollection)
                        manager.Context.Pop(); 
                }
            }

            return errors; 
        }
 
        internal static ValidationErrorCollection ValidateActivity(ValidationManager manager, Activity activity) 
        {
            ValidationErrorCollection errors = ValidationHelpers.ValidateObject(manager, activity); 

            foreach (ValidationError error in errors)
            {
                if (!error.UserData.Contains(typeof(Activity))) 
                    error.UserData[typeof(Activity)] = activity;
            } 
            return errors; 
        }
 
        internal static ValidationErrorCollection ValidateProperty(ValidationManager manager, Activity activity, object obj, PropertyValidationContext propertyValidationContext)
        {
            return ValidateProperty(manager, activity, obj, propertyValidationContext, null);
        } 

        internal static ValidationErrorCollection ValidateProperty(ValidationManager manager, Activity activity, object obj, PropertyValidationContext propertyValidationContext, object extendedPropertyContext) 
        { 
            if (manager == null)
                throw new ArgumentNullException("manager"); 
            if (obj == null)
                throw new ArgumentNullException("obj");
            if (propertyValidationContext == null)
                throw new ArgumentNullException("propertyValidationContext"); 

            ValidationErrorCollection errors = new ValidationErrorCollection(); 
 
            manager.Context.Push(activity);
            manager.Context.Push(propertyValidationContext); 
            if (extendedPropertyContext != null)
                manager.Context.Push(extendedPropertyContext);
            try
            { 
                errors.AddRange(ValidationHelpers.ValidateObject(manager, obj));
            } 
            finally 
            {
                manager.Context.Pop(); 
                manager.Context.Pop();
                if (extendedPropertyContext != null)
                    manager.Context.Pop();
            } 

            return errors; 
        } 
    }
} 

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