1 files changed, 266 insertions, 0 deletions

diff --git a/src/WixToolset.Data.WindowsInstaller/Field.cs b/src/WixToolset.Data.WindowsInstaller/Field.cs
new file mode 100644
index 00000000..74b78229
--- /dev/null
+++ b/src/WixToolset.Data.WindowsInstaller/Field.cs
@@ -0,0 +1,266 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Data
+{
+    using System;
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Xml;
+
+    /// <summary>
+    /// Field containing data for a column in a row.
+    /// </summary>
+    public class Field
+    {
+        private object data;
+
+        /// <summary>
+        /// Instantiates a new Field.
+        /// </summary>
+        /// <param name="columnDefinition">Column definition for this field.</param>
+        protected Field(ColumnDefinition columnDefinition)
+        {
+            this.Column = columnDefinition;
+        }
+
+        /// <summary>
+        /// Gets or sets the column definition for this field.
+        /// </summary>
+        /// <value>Column definition.</value>
+        public ColumnDefinition Column { get; private set; }
+
+        /// <summary>
+        /// Gets or sets the data for this field.
+        /// </summary>
+        /// <value>Data in the field.</value>
+        public object Data
+        {
+            get
+            {
+                return this.data;
+            }
+
+            set
+            {
+                // Validate the value before setting it.
+                this.data = this.Column.ValidateValue(value);
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets whether this field is modified.
+        /// </summary>
+        /// <value>Whether this field is modified.</value>
+        public bool Modified { get; set; }
+
+        /// <summary>
+        /// Gets or sets the previous data.
+        /// </summary>
+        /// <value>The previous data.</value>
+        public string PreviousData { get; set; }
+
+        /// <summary>
+        /// Instantiate a new Field object of the correct type.
+        /// </summary>
+        /// <param name="columnDefinition">The column definition for the field.</param>
+        /// <returns>The new Field object.</returns>
+        public static Field Create(ColumnDefinition columnDefinition)
+        {
+            return (ColumnType.Object == columnDefinition.Type) ? new ObjectField(columnDefinition) : new Field(columnDefinition);
+        }
+
+        /// <summary>
+        /// Sets the value of a particular field in the row without validating.
+        /// </summary>
+        /// <param name="field">field index.</param>
+        /// <param name="value">Value of a field in the row.</param>
+        /// <returns>True if successful, false if validation failed.</returns>
+        public bool BestEffortSet(object value)
+        {
+            bool success = true;
+            object bestEffortValue = value;
+
+            try
+            {
+                bestEffortValue = this.Column.ValidateValue(value);
+            }
+            catch (InvalidOperationException)
+            {
+                success = false;
+            }
+
+            this.data = bestEffortValue;
+            return success;
+        }
+
+        /// <summary>
+        /// Determine if this field is identical to another field.
+        /// </summary>
+        /// <param name="field">The other field to compare to.</param>
+        /// <returns>true if they are equal; false otherwise.</returns>
+        public bool IsIdentical(Field field)
+        {
+            return (this.Column.Name == field.Column.Name &&
+                ((null != this.data && this.data.Equals(field.data)) || (null == this.data && null == field.data)));
+        }
+
+        /// <summary>
+        /// Overrides the built in object implementation to return the field's data as a string.
+        /// </summary>
+        /// <returns>Field's data as a string.</returns>
+        public override string ToString()
+        {
+            return this.AsString();
+        }
+
+        /// <summary>
+        /// Gets the field as an integer.
+        /// </summary>
+        /// <returns>Field's data as an integer.</returns>
+        public int AsInteger()
+        {
+            return (this.data is int) ? (int)this.data : Convert.ToInt32(this.data, CultureInfo.InvariantCulture);
+        }
+
+        /// <summary>
+        /// Gets the field as an integer that could be null.
+        /// </summary>
+        /// <returns>Field's data as an integer that could be null.</returns>
+        public int? AsNullableInteger()
+        {
+            return (null == this.data) ? (int?)null : (this.data is int) ? (int)this.data : Convert.ToInt32(this.data, CultureInfo.InvariantCulture);
+        }
+
+        /// <summary>
+        /// Gets the field as a string.
+        /// </summary>
+        /// <returns>Field's data as a string.</returns>
+        public string AsString()
+        {
+            return (null == this.data) ? null : Convert.ToString(this.data, CultureInfo.InvariantCulture);
+        }
+
+        /// <summary>
+        /// Parse a field from the xml.
+        /// </summary>
+        /// <param name="reader">XmlReader where the intermediate is persisted.</param>
+        internal virtual void Read(XmlReader reader)
+        {
+            Debug.Assert("field" == reader.LocalName);
+
+            bool empty = reader.IsEmptyElement;
+
+            while (reader.MoveToNextAttribute())
+            {
+                switch (reader.LocalName)
+                {
+                    case "modified":
+                        this.Modified = reader.Value.Equals("yes");
+                        break;
+                    case "previousData":
+                        this.PreviousData = reader.Value;
+                        break;
+                }
+            }
+
+            if (!empty)
+            {
+                bool done = false;
+
+                while (!done && reader.Read())
+                {
+                    switch (reader.NodeType)
+                    {
+                        case XmlNodeType.Element:
+                            throw new XmlException();
+                        case XmlNodeType.CDATA:
+                        case XmlNodeType.Text:
+                        case XmlNodeType.SignificantWhitespace:
+                            if (0 < reader.Value.Length)
+                            {
+                                if (ColumnType.Number == this.Column.Type && !this.Column.IsLocalizable)
+                                {
+                                    // older wix files could persist data as a long value (which would overflow an int)
+                                    // since the Convert class always throws exceptions for overflows, read in integral
+                                    // values as a long to avoid the overflow, then cast it to an int (this operation can
+                                    // overflow without throwing an exception inside an unchecked block)
+                                    this.data = unchecked((int)Convert.ToInt64(reader.Value, CultureInfo.InvariantCulture));
+                                }
+                                else
+                                {
+                                    this.data = reader.Value;
+                                }
+                            }
+                            break;
+                        case XmlNodeType.EndElement:
+                            done = true;
+                            break;
+                    }
+                }
+
+                if (!done)
+                {
+                    throw new XmlException();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Persists a field in an XML format.
+        /// </summary>
+        /// <param name="writer">XmlWriter where the Field should persist itself as XML.</param>
+        internal virtual void Write(XmlWriter writer)
+        {
+            writer.WriteStartElement("field", Intermediate.XmlNamespaceUri);
+
+            if (this.Modified)
+            {
+                writer.WriteAttributeString("modified", "yes");
+            }
+
+            if (null != this.PreviousData)
+            {
+                writer.WriteAttributeString("previousData", this.PreviousData);
+            }
+
+            // Convert the data to a string that will persist nicely (nulls as String.Empty).
+            string text = Convert.ToString(this.data, CultureInfo.InvariantCulture);
+            if (this.Column.UseCData)
+            {
+                writer.WriteCData(text);
+            }
+            else
+            {
+                writer.WriteString(text);
+            }
+
+            writer.WriteEndElement();
+        }
+
+        /// <summary>
+        /// Returns the field data in a format usable in IDT files.
+        /// </summary>
+        /// <returns>Field data in string IDT format.</returns>
+        internal string ToIdtValue()
+        {
+            if (null == this.data)
+            {
+                return null;
+            }
+            else
+            {
+                string fieldData = Convert.ToString(this.data, CultureInfo.InvariantCulture);
+
+                // special idt-specific escaping
+                if (this.Column.EscapeIdtCharacters)
+                {
+                    fieldData = fieldData.Replace('\t', '\x10');
+                    fieldData = fieldData.Replace('\r', '\x11');
+                    fieldData = fieldData.Replace('\n', '\x19');
+                }
+
+                return fieldData;
+            }
+        }
+    }
+}