Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / ComponentFactoryHelpers.cs / 1305376 / ComponentFactoryHelpers.cs
namespace System.Workflow.ComponentModel { using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.ComponentModel; using System.Globalization; using System.Reflection; using System.Workflow.ComponentModel.Compiler; #region Class ComponentDispenser internal static class ComponentDispenser { private static IDictionary> componentExtenderMap = new Dictionary >(); //it is super critical to note that even though we pass activity instead of a System.Type //here, the method impl does not rely on any objectness but relies only on typeness //- this is done to keep a static type level executor metadata (and not instance level) // scoped in an app domain internal static ActivityExecutor[] CreateActivityExecutors(Activity activity) { if (activity == null) throw new ArgumentNullException("activity"); List executors = new List (); if (activity.SupportsSynchronization) executors.Add(new SynchronizationFilter()); if(activity.SupportsTransaction) executors.Add(new TransactedContextFilter()); if (activity is CompositeActivity) { if (activity is ICompensatableActivity) executors.Add(new CompensationHandlingFilter()); executors.Add(new FaultAndCancellationHandlingFilter()); executors.Add(new CompositeActivityExecutor ()); } else executors.Add(new ActivityExecutor ()); return executors.ToArray(); } internal static object[] CreateComponents(Type objectType, Type componentTypeAttribute) { //*******DO NOT CHANGE THE ORDER OF THE EXECUTION AS IT HAS SIGNIFICANCE AT RUNTIME Dictionary components = new Dictionary (); // Goto all the attributes and collect matching attributes and component factories ArrayList supportsTransactionComponents = new ArrayList(); ArrayList supportsCancelHandlerComponents = new ArrayList(); ArrayList supportsSynchronizationComponents = new ArrayList(); ArrayList supportsCompensationHandlerComponents = new ArrayList(); // dummy calls to make sure that attributes are in good shape GetCustomAttributes(objectType, typeof(ActivityCodeGeneratorAttribute), true); GetCustomAttributes(objectType, typeof(ActivityValidatorAttribute), true); GetCustomAttributes(objectType, typeof(System.ComponentModel.DesignerAttribute), true); GetCustomAttributes(objectType, typeof(System.ComponentModel.Design.Serialization.DesignerSerializerAttribute), true); if (objectType.GetCustomAttributes(typeof(SupportsTransactionAttribute), true).Length > 0) { if (componentTypeAttribute == typeof(ActivityValidatorAttribute)) supportsTransactionComponents.Add(new TransactionContextValidator()); } if (objectType.GetCustomAttributes(typeof(SupportsSynchronizationAttribute), true).Length > 0) { if (componentTypeAttribute == typeof(ActivityValidatorAttribute)) supportsSynchronizationComponents.Add(new SynchronizationValidator()); } // IMPORTANT: sequence of these components is really critical AddComponents(components, supportsSynchronizationComponents.ToArray()); AddComponents(components, supportsTransactionComponents.ToArray()); AddComponents(components, supportsCompensationHandlerComponents.ToArray()); AddComponents(components, supportsCancelHandlerComponents.ToArray()); //Goto all the interfaces and collect matching attributes and component factories ArrayList customAttributes = new ArrayList(); foreach (Type interfaceType in objectType.GetInterfaces()) customAttributes.AddRange(ComponentDispenser.GetCustomAttributes(interfaceType, componentTypeAttribute, true)); //Add all the component's attributes customAttributes.AddRange(ComponentDispenser.GetCustomAttributes(objectType, componentTypeAttribute, true)); string typeName = null; foreach (Attribute attribute in customAttributes) { Type expectedBaseType = null; if (componentTypeAttribute == typeof(ActivityCodeGeneratorAttribute)) { typeName = ((ActivityCodeGeneratorAttribute)attribute).CodeGeneratorTypeName; expectedBaseType = typeof(ActivityCodeGenerator); } else if (componentTypeAttribute == typeof(ActivityValidatorAttribute)) { typeName = ((ActivityValidatorAttribute)attribute).ValidatorTypeName; expectedBaseType = typeof(Validator); } else { System.Diagnostics.Debug.Assert(false, "wrong attribute type"); } object component = null; try { if (!String.IsNullOrEmpty(typeName)) component = ComponentDispenser.CreateComponentInstance(typeName, objectType); } catch { } if ((component != null && expectedBaseType != null && expectedBaseType.IsAssignableFrom(component.GetType()))) { if (!components.ContainsKey(component.GetType())) components.Add(component.GetType(), component); } else { throw new InvalidOperationException(SR.GetString(SR.Error_InvalidAttribute, componentTypeAttribute.Name, objectType.FullName)); } } return new ArrayList(components.Values).ToArray(); } private static void AddComponents(Dictionary components, object[] attribComponents) { foreach (object component in attribComponents) { if (!components.ContainsKey(component.GetType())) components.Add(component.GetType(), component); } } internal static void RegisterComponentExtenders(Type extendingType, IExtenderProvider[] extenders) { //Make sure that there are no previous registered components List extenderProviders = null; if (!componentExtenderMap.ContainsKey(extendingType)) { extenderProviders = new List (); componentExtenderMap.Add(extendingType, extenderProviders); } else { extenderProviders = componentExtenderMap[extendingType]; } extenderProviders.AddRange(extenders); } internal static IList Extenders { get { List extenders = new List (); foreach (IList registeredExtenders in componentExtenderMap.Values) extenders.AddRange(registeredExtenders); return extenders.AsReadOnly(); } } // The referenceType parameter provides a way to identify the assembly in which to look for the type. private static object CreateComponentInstance(string typeName, Type referenceType) { object component = null; Type componentType = null; try { string typeFullName = typeName; int squareBracketCloseIndex = typeName.LastIndexOf(']'); if (squareBracketCloseIndex != -1) { typeFullName = typeName.Substring(0, squareBracketCloseIndex + 1); } else { int commaIndex = typeName.IndexOf(','); if (commaIndex != -1) typeFullName = typeName.Substring(0, commaIndex); } componentType = referenceType.Assembly.GetType(typeFullName, false); } catch { } if (componentType == null) { try { componentType = Type.GetType(typeName, false); } catch { } } string message = null; if (componentType != null) { try { component = Activator.CreateInstance(componentType); } catch (Exception ex) { message = ex.Message; // Process error condition below } } if (component == null) { System.Resources.ResourceManager resourceManager = new System.Resources.ResourceManager("System.Workflow.ComponentModel.StringResources", typeof(System.Workflow.ComponentModel.Activity).Assembly); if (resourceManager != null) message = string.Format(CultureInfo.CurrentCulture, resourceManager.GetString("Error_CantCreateInstanceOfComponent"), new object[] { typeName, message }); throw new Exception(message); } return component; } private static object[] GetCustomAttributes(Type objectType, Type attributeType, bool inherit) { object[] attribs = null; try { if (attributeType == null) attribs = objectType.GetCustomAttributes(inherit); else attribs = objectType.GetCustomAttributes(attributeType, inherit); } catch (Exception e) { throw new InvalidOperationException(SR.GetString(SR.Error_InvalidAttributes, objectType.FullName), e); } return attribs; } } #endregion } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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