Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Base / Core / Metadata / AttributeTableBuilder.cs / 1305376 / AttributeTableBuilder.cs
//---------------------------------------------------------------- // Copyright (c) Microsoft Corporation. All rights reserved. //--------------------------------------------------------------- namespace System.Activities.Presentation.Metadata { using System.Activities.Presentation.Internal.Metadata; using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Reflection; using System.Windows; using System.Activities.Presentation; //// An attribute table is a read only blob of data. How // do you create one? We will have a class called an // Attribute Builder that can be used to create an attribute // table. Attribute builders have methods you can call to // add metadata. When you�re finished, you can produce an // attribute table from the builder. Builder methods also // support callback delegates so the entire process can be // deferred until needed. // public class AttributeTableBuilder { private MutableAttributeTable _table = new MutableAttributeTable(); private bool _cloneOnUse; // // Returns an attribute table we can make changes to // private MutableAttributeTable MutableTable { get { if (_cloneOnUse) { MutableAttributeTable clone = new MutableAttributeTable(); clone.AddTable(_table); _table = clone; _cloneOnUse = false; } return _table; } } //// Adds a callback that will be invoked when metadata for the // given type is needed. The callback can add metadata to // to the attribute table on demand, which is much more efficient // than adding metadata up front. // // // public void AddCallback(Type type, AttributeCallback callback) { if (type == null) { throw FxTrace.Exception.ArgumentNull("type"); } if (callback == null) { throw FxTrace.Exception.ArgumentNull("callback"); } MutableTable.AddCallback(type, callback); } //// Adds the contents of the provided attributes to this builder. // Conflicts are resolved with a last-in-wins strategy. When // building a large attribute table it is best to use AddCallback // to defer the work of creating attributes until they are needed. // // The type to add class-level attributes to. // // The new attributes to add. // //if type or attributes is null public void AddCustomAttributes(Type type, params Attribute[] attributes) { if (type == null) { throw FxTrace.Exception.ArgumentNull("type"); } if (attributes == null) { throw FxTrace.Exception.ArgumentNull("attributes"); } MutableTable.AddCustomAttributes(type, attributes); } //// Adds the contents of the provided attributes to this builder. // Conflicts are resolved with a last-in-wins strategy. When // building a large attribute table it is best to use AddCallback // to defer the work of creating attributes until they are needed. // // // The type the member lives on. // // An event or property descriptor to add attributes to. // // The new attributes to add. // //if descriptor or attributes is null public void AddCustomAttributes(Type ownerType, MemberDescriptor descriptor, params Attribute[] attributes) { if (ownerType == null) { throw FxTrace.Exception.ArgumentNull("ownerType"); } if (descriptor == null) { throw FxTrace.Exception.ArgumentNull("descriptor"); } if (attributes == null) { throw FxTrace.Exception.ArgumentNull("attributes"); } MutableTable.AddCustomAttributes(ownerType, descriptor, attributes); } //// Adds the contents of the provided attributes to this builder. // Conflicts are resolved with a last-in-wins strategy. When // building a large attribute table it is best to use AddCallback // to defer the work of creating attributes until they are needed. // // // The type the member lives on. // // An event or property info to add attributes to. // // The new attributes to add. // //if member or attributes is null public void AddCustomAttributes(Type ownerType, MemberInfo member, params Attribute[] attributes) { if (ownerType == null) { throw FxTrace.Exception.ArgumentNull("ownerType"); } if (member == null) { throw FxTrace.Exception.ArgumentNull("member"); } if (attributes == null) { throw FxTrace.Exception.ArgumentNull("attributes"); } MutableTable.AddCustomAttributes(ownerType, member, attributes); } //// Adds attributes to the member with the given name. The member can be a property // or an event. The member is evaluated on demand when the user queries // attributes on a given property or event. // // // The type the member lives on. // // // The member to add attributes for. Only property and event members are supported; // all others will be ignored. // // // The new attributes to add. // public void AddCustomAttributes(Type ownerType, string memberName, params Attribute[] attributes) { if (ownerType == null) { throw FxTrace.Exception.ArgumentNull("ownerType"); } if (memberName == null) { throw FxTrace.Exception.ArgumentNull("memberName"); } MutableTable.AddCustomAttributes(ownerType, memberName, attributes); } //// Adds the contents of the provided attributes to this builder. // Conflicts are resolved with a last-in-wins strategy. When // building a large attribute table it is best to use AddCallback // to defer the work of creating attributes until they are needed. // // // The type that owns the dependency property. // // A dependency property to add attributes to. // // The new attributes to add. // //if dp, ownerType or attributes is null public void AddCustomAttributes(Type ownerType, DependencyProperty dp, params Attribute[] attributes) { if (ownerType == null) { throw FxTrace.Exception.ArgumentNull("ownerType"); } if (dp == null) { throw FxTrace.Exception.ArgumentNull("dp"); } if (attributes == null) { throw FxTrace.Exception.ArgumentNull("attributes"); } MutableTable.AddCustomAttributes(ownerType, dp, attributes); } //// Adds the contents of the provided attribute table to // this builder. Conflicts are resolved with a last-in-wins // strategy. // // An existing attribute table. //if table is null public void AddTable(AttributeTable table) { if (table == null) { throw FxTrace.Exception.ArgumentNull("table"); } MutableTable.AddTable(table.MutableTable); } //// Creates an attribute table that contains all of the attribute // definitions provided through AddAttribute calls. The table is // a snapshot of the current state of the attribute builder; any // subsequent AddAttribute calls are not included in the table. // // If callback methods were used to declare attributes, those methods // will not be evaluated during CreateTable. Instead, the table will // contain those callbacks and will evaluate them as needed. // //// An attribute table that can be passed to the metadata store. // public AttributeTable CreateTable() { _cloneOnUse = true; return new AttributeTable(_table); } //// This method can be used to verify that the attribute table // that is being built contains valid attribute information. // Some overrides of AddCustomAttributes cannot validate that // values passed to their prameters represent valid members on // classes. Therefore, incorrect information passed to // AddCustomAttributes may go undetected. ValidateTable will // run through the contents of the AttributeTableBuilder and // verify that all custom attribute information matches up with // physical members. Note: calling this method can be very // costly so you should only do it when validation is absolutely // needed. // //if the state of the table is invalid. public void ValidateTable() { MutableTable.ValidateTable(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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