Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / RowToParametersTransformer.cs / 1 / RowToParametersTransformer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.WebControls.WebParts { using System; using System.Collections; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Security.Permissions; using System.Web.UI.WebControls; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] [WebPartTransformer(typeof(IWebPartRow), typeof(IWebPartParameters))] public sealed class RowToParametersTransformer : WebPartTransformer, IWebPartParameters { private IWebPartRow _provider; private string[] _consumerFieldNames; private string[] _providerFieldNames; private PropertyDescriptorCollection _consumerSchema; private ParametersCallback _callback; public override Control CreateConfigurationControl() { return new RowToParametersConfigurationWizard(this); } [ TypeConverterAttribute(typeof(StringArrayConverter)), ] public string[] ConsumerFieldNames { get { return (_consumerFieldNames != null) ? (string[])_consumerFieldNames.Clone() : new string[0]; } set { _consumerFieldNames = (value != null) ? (string[])value.Clone() : null; } } private PropertyDescriptorCollection ConsumerSchema { get { return _consumerSchema; } } [ TypeConverterAttribute(typeof(StringArrayConverter)), ] public string[] ProviderFieldNames { get { return (_providerFieldNames != null) ? (string[])_providerFieldNames.Clone() : new string[0]; } set { _providerFieldNames = (value != null) ? (string[])value.Clone() : null; } } private PropertyDescriptorCollection ProviderSchema { get { return (_provider != null) ? _provider.Schema : null; } } // Schema containing property descriptors associated with each name in ProviderFieldNames private PropertyDescriptorCollection SelectedProviderSchema { get { PropertyDescriptorCollection props = new PropertyDescriptorCollection(null); PropertyDescriptorCollection providerSchema = ProviderSchema; if (providerSchema != null && _providerFieldNames != null && _providerFieldNames.Length > 0) { foreach (string fieldName in _providerFieldNames) { PropertyDescriptor prop = providerSchema.Find(fieldName, /* ignoreCase */ true); if (prop == null) { // If any provider field name is not in the schema, return an empty schema return new PropertyDescriptorCollection(null); } else { props.Add(prop); } } } return props; } } // Throws an exception if the ConsumerFieldNames and ProviderFieldNames have different length private void CheckFieldNamesLength() { int consumerFieldNamesLength = (_consumerFieldNames != null) ? _consumerFieldNames.Length : 0; int providerFieldNamesLength = (_providerFieldNames != null) ? _providerFieldNames.Length : 0; if (consumerFieldNamesLength != providerFieldNamesLength) { throw new InvalidOperationException(SR.GetString(SR.RowToParametersTransformer_DifferentFieldNamesLength)); } } private void GetRowData(object rowData) { Debug.Assert(_callback != null); // Only return null if rowData is null. Else, return an empty dictionary. (VSWhidbey 381264) IDictionary parametersData = null; // For perf, check in decreasing order of likeliness that an object is null if (rowData != null) { PropertyDescriptorCollection consumerSchema = ((IWebPartParameters)this).Schema; parametersData = new HybridDictionary(consumerSchema.Count); if (consumerSchema.Count > 0) { PropertyDescriptorCollection providerSchema = SelectedProviderSchema; if (providerSchema != null && providerSchema.Count > 0) { if (providerSchema.Count == consumerSchema.Count) { for (int i=0; i < providerSchema.Count; i++) { PropertyDescriptor providerProp = providerSchema[i]; PropertyDescriptor consumerProp = consumerSchema[i]; parametersData[consumerProp.Name] = providerProp.GetValue(rowData); } } } } } _callback(parametersData); } protected internal override void LoadConfigurationState(object savedState) { if (savedState != null) { string[] fieldNames = (string[])savedState; int fieldNamesLength = fieldNames.Length; if (fieldNamesLength % 2 != 0) { throw new InvalidOperationException(SR.GetString(SR.RowToParametersTransformer_DifferentFieldNamesLength)); } int length = fieldNamesLength / 2; _consumerFieldNames = new string[length]; _providerFieldNames = new string[length]; for (int i=0; i < length; i++) { _consumerFieldNames[i] = fieldNames[2*i]; _providerFieldNames[i] = fieldNames[2*i + 1]; } } } protected internal override object SaveConfigurationState() { CheckFieldNamesLength(); int consumerFieldNamesLength = (_consumerFieldNames != null) ? _consumerFieldNames.Length : 0; if (consumerFieldNamesLength > 0) { string[] fieldNames = new string[consumerFieldNamesLength * 2]; for (int i=0; i < consumerFieldNamesLength; i++) { fieldNames[2*i] = _consumerFieldNames[i]; fieldNames[2*i + 1] = _providerFieldNames[i]; } return fieldNames; } return null; } public override object Transform(object providerData) { _provider = (IWebPartRow)providerData; return this; } #region Implementation of IWebPartParameters void IWebPartParameters.GetParametersData(ParametersCallback callback) { if (callback == null) { throw new ArgumentNullException("callback"); } CheckFieldNamesLength(); if (_provider != null) { _callback = callback; _provider.GetRowData(new RowCallback(GetRowData)); } else { callback(null); } } PropertyDescriptorCollection IWebPartParameters.Schema { get { CheckFieldNamesLength(); PropertyDescriptorCollection props = new PropertyDescriptorCollection(null); if (_consumerSchema != null && _consumerFieldNames != null && _consumerFieldNames.Length > 0) { foreach (string fieldName in _consumerFieldNames) { PropertyDescriptor prop = _consumerSchema.Find(fieldName, true); if (prop == null) { // If any consumer field name is not in the schema, return an empty schema return new PropertyDescriptorCollection(null); } else { props.Add(prop); } } } return props; } } void IWebPartParameters.SetConsumerSchema(PropertyDescriptorCollection schema) { _consumerSchema = schema; } #endregion private sealed class RowToParametersConfigurationWizard : TransformerConfigurationWizardBase { private DropDownList[] _consumerFieldNames; private RowToParametersTransformer _owner; private const string consumerFieldNameID = "ConsumerFieldName"; public RowToParametersConfigurationWizard(RowToParametersTransformer owner) { Debug.Assert(owner != null); _owner = owner; } protected override PropertyDescriptorCollection ConsumerSchema { get { return _owner.ConsumerSchema; } } protected override PropertyDescriptorCollection ProviderSchema { get { return _owner.ProviderSchema; } } protected override void CreateWizardSteps() { // The WizardSteps should be empty when this is called Debug.Assert(WizardSteps.Count == 0); int oldProviderNamesLength = (OldProviderNames != null) ? OldProviderNames.Length : 0; if (oldProviderNamesLength > 0) { _consumerFieldNames = new DropDownList[oldProviderNamesLength / 2]; ListItem[] consumerItems = null; int oldConsumerNamesLength = (OldConsumerNames != null) ? OldConsumerNames.Length : 0; if (oldConsumerNamesLength > 0) { consumerItems = new ListItem[oldConsumerNamesLength / 2]; for (int i=0; i < oldConsumerNamesLength / 2; i++) { consumerItems[i] = new ListItem(OldConsumerNames[2*i], OldConsumerNames[2*i + 1]); } } for (int i=0; i < oldProviderNamesLength / 2; i++) { WizardStep s = new WizardStep(); s.Controls.Add(new LiteralControl( SR.GetString(SR.RowToParametersTransformer_ProviderFieldName) + " ")); Label label = new Label(); // HtmlEncode the string, since it comes from the provider schema and it may contain // unsafe characters. label.Text = HttpUtility.HtmlEncode(OldProviderNames[2*i]); label.Font.Bold = true; s.Controls.Add(label); s.Controls.Add(new LiteralControl("
")); DropDownList consumerFieldName = new DropDownList(); consumerFieldName.ID = consumerFieldNameID + i; if (consumerItems != null) { consumerFieldName.Items.Add(new ListItem()); // Calculate consumerFieldValue based on the current providerFieldValue, // and the ProviderFieldNames and ConsumerFieldNames on the Transformer string[] providerFieldNames = _owner._providerFieldNames; string[] consumerFieldNames = _owner._consumerFieldNames; string providerFieldValue = OldProviderNames[2*i + 1]; string consumerFieldValue = null; if (providerFieldNames != null) { for (int j=0; j < providerFieldNames.Length; j++) { // Ignore case when getting the value, since we ignore case when // returing the connection data. (VSWhidbey 434566) if (String.Equals(providerFieldNames[j], providerFieldValue, StringComparison.OrdinalIgnoreCase) && consumerFieldNames != null && consumerFieldNames.Length > j) { consumerFieldValue = consumerFieldNames[j]; break; } } } foreach (ListItem consumerItem in consumerItems) { ListItem item = new ListItem(consumerItem.Text, consumerItem.Value); // Ignore case when setting selected value, since we ignore case when // returing the connection data. (VSWhidbey 434566) if (String.Equals(item.Value, consumerFieldValue, StringComparison.OrdinalIgnoreCase)) { item.Selected = true; } consumerFieldName.Items.Add(item); } } else { consumerFieldName.Items.Add(new ListItem( SR.GetString(SR.RowToParametersTransformer_NoConsumerSchema))); consumerFieldName.Enabled = false; } _consumerFieldNames[i] = consumerFieldName; Label consumerFieldNameLabel = new Label(); consumerFieldNameLabel.Text = SR.GetString(SR.RowToParametersTransformer_ConsumerFieldName); consumerFieldNameLabel.AssociatedControlID = consumerFieldName.ID; s.Controls.Add(consumerFieldNameLabel); s.Controls.Add(new LiteralControl(" ")); s.Controls.Add(consumerFieldName); WizardSteps.Add(s); } } else { WizardStep s = new WizardStep(); s.Controls.Add(new LiteralControl(SR.GetString(SR.RowToParametersTransformer_NoProviderSchema))); WizardSteps.Add(s); } // We should always have at least 1 WizardStep when we return Debug.Assert(WizardSteps.Count > 0); } protected override void OnFinishButtonClick(WizardNavigationEventArgs e) { ArrayList providerFieldNames = new ArrayList(); ArrayList consumerFieldNames = new ArrayList(); int oldProviderNamesLength = (OldProviderNames != null) ? OldProviderNames.Length : 0; if (oldProviderNamesLength > 0) { Debug.Assert(_consumerFieldNames != null); Debug.Assert(oldProviderNamesLength == 2 * _consumerFieldNames.Length); for (int i=0; i < _consumerFieldNames.Length; i++) { DropDownList consumerFieldName = _consumerFieldNames[i]; if (consumerFieldName.Enabled) { string selectedConsumerFieldName = consumerFieldName.SelectedValue; if (!String.IsNullOrEmpty(selectedConsumerFieldName)) { providerFieldNames.Add(OldProviderNames[2*i + 1]); consumerFieldNames.Add(selectedConsumerFieldName); } } } } _owner.ConsumerFieldNames = (string[])consumerFieldNames.ToArray(typeof(string)); _owner.ProviderFieldNames = (string[])providerFieldNames.ToArray(typeof(string)); base.OnFinishButtonClick(e); } } } }
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