531 lines
13 KiB
C#
531 lines
13 KiB
C#
//
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// MetaColumn.cs
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//
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// Author:
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// Atsushi Enomoto <atsushi@ximian.com>
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// Marek Habersack <mhabersack@novell.com>
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//
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// Copyright (C) 2008-2009 Novell Inc. http://novell.com
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Collections.Specialized;
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using System.ComponentModel;
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using System.ComponentModel.DataAnnotations;
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using System.Globalization;
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using System.Linq;
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using System.Reflection;
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using System.Security.Permissions;
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using System.Security.Principal;
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using System.Web.Caching;
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using System.Web.DynamicData.ModelProviders;
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namespace System.Web.DynamicData
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{
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[AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
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[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
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public class MetaColumn : IFieldFormattingOptions
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{
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// (Int32.MaxValue / 2) - 5
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const int SHORT_STRING_MAX_LENGTH = 0x3ffffffa;
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bool? scaffold;
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bool? scaffoldReflected;
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bool? applyFormatInEditMode;
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bool? convertEmptyStringToNull;
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bool dataTypeReflected;
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bool defaultValueReflected;
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bool descriptionReflected;
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bool requiredReflected;
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bool uiHintReflected;
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string dataFormatString;
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object defaultValue;
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string description;
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string displayName;
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bool? readOnly;
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int? maxLength;
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string nullDisplayText;
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string requiredErrorMessage;
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string uiHint;
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// Attributes
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AttributeCollection attributes;
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DisplayFormatAttribute displayFormatAttr;
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DataTypeAttribute dataTypeAttr;
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ScaffoldColumnAttribute scaffoldAttr;
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RequiredAttribute requiredAttr;
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internal MetaColumn (MetaTable table, ColumnProvider provider)
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{
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Table = table;
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Provider = provider;
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Model = table.Model;
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HtmlEncode = true;
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Type columnType = ColumnType;
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TypeCode code = Type.GetTypeCode (columnType);
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TypeCode = code;
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switch (code) {
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case TypeCode.Single:
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case TypeCode.Double:
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case TypeCode.Decimal:
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IsFloatingPoint = true;
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break;
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case TypeCode.Byte:
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case TypeCode.Int16:
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case TypeCode.Int32:
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case TypeCode.Int64:
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IsInteger = true;
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break;
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case TypeCode.String:
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IsString = true;
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break;
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case TypeCode.Object:
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// So far only byte[] seems to be treated as a binary type
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if (columnType.IsArray && columnType.GetArrayRank () == 1 && columnType.GetElementType () == typeof (byte))
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IsBinaryData = true;
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break;
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default:
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TypeCode = TypeCode.Object;
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break;
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}
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IsLongString = MaxLength > SHORT_STRING_MAX_LENGTH;
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}
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public bool ApplyFormatInEditMode {
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get {
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if (applyFormatInEditMode == null)
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applyFormatInEditMode = CheckApplyFormatInEditMode ();
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return (bool)applyFormatInEditMode;
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}
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}
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public AttributeCollection Attributes {
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get {
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if (attributes == null)
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attributes = LoadAttributes ();
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return attributes;
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}
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}
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public Type ColumnType {
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get { return Provider.ColumnType; }
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}
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public bool ConvertEmptyStringToNull {
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get {
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if (convertEmptyStringToNull == null)
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convertEmptyStringToNull = CheckConvertEmptyStringToNull ();
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return (bool)convertEmptyStringToNull;
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}
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}
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public string DataFormatString {
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get {
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if (dataFormatString == null)
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dataFormatString = CheckDataFormatString ();
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return dataFormatString;
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}
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}
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public DataTypeAttribute DataTypeAttribute {
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get {
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if (!dataTypeReflected && dataTypeAttr == null)
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dataTypeAttr = CheckDataTypeAttribute ();
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return dataTypeAttr;
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}
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}
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public Object DefaultValue {
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get {
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if (!defaultValueReflected && defaultValue == null) {
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DefaultValueAttribute defaultValueAttr = CheckDefaultValueAttribute ();
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if (defaultValueAttr != null)
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defaultValue = defaultValueAttr.Value;
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}
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return defaultValue;
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}
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}
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public string Description {
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get {
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if (!descriptionReflected && description == null) {
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DescriptionAttribute descriptionAttr = CheckDescriptionAttribute ();
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if (descriptionAttr != null)
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description = descriptionAttr.Description;
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}
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return description;
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}
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}
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public string DisplayName {
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get {
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if (displayName == null)
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displayName = CheckDisplayName ();
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return displayName;
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}
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}
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public PropertyInfo EntityTypeProperty {
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get { return Provider.EntityTypeProperty; }
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}
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public bool HtmlEncode { get; private set; }
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public bool IsBinaryData { get; private set; }
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public bool IsCustomProperty {
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get { return Provider.IsCustomProperty; }
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}
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public bool IsFloatingPoint { get; private set; }
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public bool IsForeignKeyComponent {
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get { return Provider.IsForeignKeyComponent; }
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}
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public bool IsGenerated {
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get { return Provider.IsGenerated; }
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}
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public bool IsInteger { get; private set; }
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public bool IsLongString { get; private set; }
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public bool IsPrimaryKey {
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get { return Provider.IsPrimaryKey; }
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}
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public bool IsReadOnly {
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get {
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if (readOnly == null)
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readOnly = CheckReadOnlyAttribute ();
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return (bool)readOnly;
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}
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}
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// It appears that all columns are required unless Provider.Nullable is true for
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// them. We could skip checking for the RequiredAttribute for that reason, but that
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// way we wouldn't be forward-compatible.
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// What's more, it appears that a RequiredAttribute instance is always included in
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// Attributes, whether or not the corresponding field is decorataed with it.
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public bool IsRequired {
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get {
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if (!requiredReflected && requiredAttr == null)
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requiredAttr = CheckRequiredAttribute ();
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return requiredAttr != null;
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}
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}
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public bool IsString { get; private set; }
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public int MaxLength {
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get {
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if (maxLength == null)
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maxLength = CheckMaxLength ();
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return (int)maxLength;
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}
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}
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public MetaModel Model { get; private set; }
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public string Name {
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get { return Provider.Name; }
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}
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public string NullDisplayText {
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get {
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if (nullDisplayText == null)
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nullDisplayText = CheckNullDisplayText ();
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return nullDisplayText;
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}
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}
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public ColumnProvider Provider { get; private set; }
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public string RequiredErrorMessage {
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get {
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if (requiredErrorMessage == null) {
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RequiredAttribute attr = CheckRequiredAttribute ();
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if (attr == null)
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requiredErrorMessage = String.Empty;
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else
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requiredErrorMessage = attr.ErrorMessage;
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}
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return requiredErrorMessage;
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}
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}
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public bool Scaffold {
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get {
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if (scaffold != null)
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return (bool)scaffold;
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if (scaffoldReflected != null)
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return (bool)scaffoldReflected;
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MetaModel.GetDataFieldAttribute <ScaffoldColumnAttribute> (Attributes, ref scaffoldAttr);
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if (scaffoldAttr != null) {
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scaffoldReflected = scaffoldAttr.Scaffold;
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return (bool)scaffoldReflected;
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}
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string uiHint = UIHint;
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if (!String.IsNullOrEmpty (uiHint))
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scaffoldReflected = true;
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// LAMESPEC: IsForeignKeyComponent does NOT set Scaffold=false
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else if (IsGenerated || IsCustomProperty)
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scaffoldReflected = false;
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else if (Table.ScaffoldAllTables)
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scaffoldReflected = true;
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else
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scaffoldReflected = true;
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return (bool)scaffoldReflected;
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}
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set { scaffold = value; }
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}
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public string SortExpression {
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get {
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ColumnProvider provider = Provider;
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if (provider.IsSortable)
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return Name;
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return String.Empty;
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}
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}
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public MetaTable Table { get; private set; }
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public TypeCode TypeCode { get; private set; }
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// LAMESPEC: if there's no attribute, null is returned
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public string UIHint {
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get {
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if (!uiHintReflected && uiHint == null)
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uiHint = CheckUIHintAttribute ();
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return uiHint;
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}
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}
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string CheckUIHintAttribute ()
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{
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if (uiHintReflected)
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return uiHint;
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uiHintReflected = true;
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UIHintAttribute attr = null;
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MetaModel.GetDataFieldAttribute <UIHintAttribute> (Attributes, ref attr);
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if (attr == null)
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return null;
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return attr.UIHint;
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}
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bool CheckApplyFormatInEditMode ()
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{
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var displayFormat = GetDisplayFormat ();
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if (displayFormat == null)
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return false;
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return displayFormat.ApplyFormatInEditMode;
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}
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bool CheckConvertEmptyStringToNull ()
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{
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var displayFormat = GetDisplayFormat ();
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if (displayFormat == null)
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return true;
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return displayFormat.ConvertEmptyStringToNull;
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}
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string CheckDataFormatString ()
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{
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var displayFormat = GetDisplayFormat ();
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if (displayFormat == null)
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return String.Empty;
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return displayFormat.DataFormatString;
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}
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DataTypeAttribute CheckDataTypeAttribute ()
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{
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if (dataTypeReflected)
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return dataTypeAttr;
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dataTypeReflected = true;
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MetaModel.GetDataFieldAttribute <DataTypeAttribute> (Attributes, ref dataTypeAttr);
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if (dataTypeAttr == null && (ColumnType == typeof (string)))
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return new DataTypeAttribute (IsLongString ? DataType.MultilineText : DataType.Text);
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return dataTypeAttr;
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}
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DefaultValueAttribute CheckDefaultValueAttribute ()
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{
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defaultValueReflected = true;
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DefaultValueAttribute dummy = null;
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MetaModel.GetDataFieldAttribute <DefaultValueAttribute> (Attributes, ref dummy);
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if (dummy == null)
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return null;
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return dummy;
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}
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DescriptionAttribute CheckDescriptionAttribute ()
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{
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descriptionReflected = true;
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DescriptionAttribute dummy = null;
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MetaModel.GetDataFieldAttribute <DescriptionAttribute> (Attributes, ref dummy);
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if (dummy == null)
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return null;
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return dummy;
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}
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string CheckDisplayName ()
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{
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DisplayNameAttribute attr = null;
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MetaModel.GetDataFieldAttribute <DisplayNameAttribute> (Attributes, ref attr);
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if (attr != null)
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return attr.DisplayName;
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return Name;
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}
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RequiredAttribute CheckRequiredAttribute ()
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{
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if (requiredReflected)
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return requiredAttr;
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requiredReflected = true;
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MetaModel.GetDataFieldAttribute <RequiredAttribute> (Attributes, ref requiredAttr);
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return requiredAttr;
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}
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bool CheckReadOnlyAttribute ()
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{
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ReadOnlyAttribute attr = null;
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MetaModel.GetDataFieldAttribute <ReadOnlyAttribute> (Attributes, ref attr);
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// Apparently attr.IsReadOnly and/or comparisons to
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// ReadOnlyAttribute.{Yes,No} don't matter. The sole presence of the
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// attribute marks column as read-only
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return attr != null;
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}
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int CheckMaxLength ()
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{
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StringLengthAttribute attr = null;
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MetaModel.GetDataFieldAttribute <StringLengthAttribute> (Attributes, ref attr);
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if (attr != null)
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return attr.MaximumLength;
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return Provider.MaxLength;
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}
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string CheckNullDisplayText ()
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{
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DisplayFormatAttribute displayFormat = GetDisplayFormat ();
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if (displayFormat == null)
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return String.Empty;
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return displayFormat.NullDisplayText;
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}
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DisplayFormatAttribute GetDisplayFormat ()
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{
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MetaModel.GetDataFieldAttribute <DisplayFormatAttribute> (Attributes, ref displayFormatAttr);
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if (displayFormatAttr == null) {
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var dta = DataTypeAttribute;
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displayFormatAttr = dta == null ? null : dta.DisplayFormat;
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}
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return displayFormatAttr;
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}
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internal virtual void Init ()
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{
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}
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AttributeCollection LoadAttributes ()
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{
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var props = MetaModel.GetTypeDescriptor (Table.EntityType).GetProperties ();
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AttributeCollection reflected;
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int propsCount = props == null ? 0 : props.Count;
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if (propsCount == 0)
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reflected = AttributeCollection.Empty;
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else {
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var property = props.Find (Name, true);
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if (property == null)
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reflected = AttributeCollection.Empty;
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else
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reflected = property.Attributes;
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}
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if (!Provider.Nullable && reflected.OfType <RequiredAttribute> ().Count () == 0)
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reflected = AttributeCollection.FromExisting (reflected, new Attribute[] { new RequiredAttribute () });
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return reflected;
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}
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public override string ToString ()
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{
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return Name;
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}
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}
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}
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