refactor expression caching; add document fields

Disco.Models/Disco.Models.csproj

@@ -68,6 +68,8 @@
     <Compile Include="Services\Devices\Exporting\DeviceExportFieldMetadata.cs" />
     <Compile Include="Services\Devices\Importing\IDeviceImportColumn.cs" />
     <Compile Include="Services\Devices\Importing\IDeviceImportDataReader.cs" />
+    <Compile Include="Services\Documents\DocumentField.cs" />
+    <Compile Include="Services\Documents\DocumentFieldType.cs" />
     <Compile Include="Services\Documents\DocumentTemplatePackage.cs" />
     <Compile Include="Services\Documents\OnImportUserFlagRule.cs" />
     <Compile Include="Services\Jobs\LocationModes.cs" />

Disco.Models/Services/Documents/DocumentField.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+
+namespace Disco.Models.Services.Documents
+{
+    public class DocumentField
+    {
+        public string Name { get; }
+        public string Value { get; }
+        public int Ordinal { get; }
+
+        public DocumentFieldType Type { get; }
+        public bool IsRequired { get; }
+        public bool IsReadOnly { get; }
+
+        public List<string> FixedValues { get; }
+
+        public DocumentField(string name, string value, int ordinal, DocumentFieldType type, bool isRequired, bool isReadOnly, List<string> fixedValues)
+        {
+            Name = name;
+            Value = value;
+            Ordinal = ordinal;
+            Type = type;
+            IsRequired = isRequired;
+            IsReadOnly = isReadOnly;
+            FixedValues = fixedValues;
+        }
+    }
+}

Disco.Models/Services/Documents/DocumentFieldType.cs

@@ -0,0 +1,14 @@
+namespace Disco.Models.Services.Documents
+{
+    public enum DocumentFieldType
+    {
+        None = 0,
+        PushButton = 1,
+        Checkbox = 2,
+        RadioButton = 3,
+        Text = 4,
+        List = 5,
+        Combo = 6,
+        Signature = 7,
+    }
+}