RowToParametersTransformer.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebParts / RowToParametersTransformer.cs / 1305376 / 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.Web.UI.WebControls; 

    [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);
            } 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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RowToParametersTransformer.cs source code in C# .NET

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