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Extensions.cs
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Extensions.cs
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using System.Collections.Generic;
using System.Linq;
using System.Xml;
using LINQPad.Extensibility.DataContext;
using Microsoft.OData.Edm;
using Microsoft.OData.Edm.Csdl;
using OData4.UI;
namespace OData4
{
public static class Extensions
{
public static ConnectionProperties GetConnectionProperties(this IConnectionInfo connectionInfo)
{
return new ConnectionProperties(connectionInfo);
}
public static IEdmModel GetModel(this ConnectionProperties properties)
{
var uri = properties.Uri;
uri += uri.EndsWith("/") ? "$metadata" : "/$metadata";
IEdmModel model;
var settings = new XmlReaderSettings
{
XmlResolver = new XmlUrlResolver
{
Credentials = properties.GetCredentials(),
Proxy = properties.GetWebProxy()
}
};
using (var reader = XmlReader.Create(uri, settings))
{
model = EdmxReader.Parse(reader);
}
return model;
}
public static List<ExplorerItem> GetSchema(this IEdmModel model)
{
var schema = new List<ExplorerItem>();
var sets = model.EntityContainer
.EntitySets()
.OrderBy(o => o.Name)
.Select(o => new ExplorerItem(o.Name, ExplorerItemKind.QueryableObject, ExplorerIcon.Table)
{
IsEnumerable = true,
ToolTipText = o.EntityType().Name,
DragText = o.Name,
Tag = o.EntityType()
})
.ToList();
foreach (var set in sets)
{
var parentType = (IEdmEntityType)set.Tag;
var children = new List<ExplorerItem>();
for (; parentType != null; parentType = parentType.BaseEntityType())
{
children.AddRange(parentType.DeclaredStructuralProperties().Select(o => GetStructuralChildItem(parentType, o)));
children.AddRange(parentType.DeclaredNavigationProperties().Select(o => GetNavigationChildItem(o, sets)));
}
set.Children = children;
}
schema.AddRange(sets);
var actions = model.SchemaElements
.OfType<IEdmAction>()
.Select(o => new ExplorerItem(o.Name, ExplorerItemKind.QueryableObject, ExplorerIcon.ScalarFunction));
schema.AddRange(actions);
return schema;
}
private static ExplorerItem GetStructuralChildItem(IEdmEntityType parentType, IEdmStructuralProperty property)
{
var icon = parentType.HasDeclaredKeyProperty(property)
? ExplorerIcon.Key
: ExplorerIcon.Column;
var name = $"{property.Name} ({property.Type.GetTypeName()})";
var item = new ExplorerItem(name, ExplorerItemKind.Property, icon)
{
DragText = property.Name
};
return item;
}
private static ExplorerItem GetNavigationChildItem(IEdmNavigationProperty property, List<ExplorerItem> schema)
{
var partnerType = property.ToEntityType();
var backReferenceType = partnerType.DeclaredNavigationProperties()
.FirstOrDefault(o => o.ToEntityType() == property.DeclaringEntityType());
var isCollection = property.Type.IsCollection();
var kind = isCollection ? ExplorerItemKind.CollectionLink : ExplorerItemKind.ReferenceLink;
ExplorerIcon icon;
if (backReferenceType == null)
icon = ExplorerIcon.Column;
else if (isCollection)
icon = backReferenceType.Type.IsCollection() ? ExplorerIcon.ManyToMany : ExplorerIcon.OneToMany;
else
icon = backReferenceType.Type.IsCollection() ? ExplorerIcon.ManyToOne : ExplorerIcon.OneToOne;
var item = new ExplorerItem(property.Name, kind, icon)
{
ToolTipText = partnerType.Name,
HyperlinkTarget = schema.FirstOrDefault(a => (IEdmEntityType)a.Tag == partnerType),
DragText = property.Name
};
return item;
}
private static string GetTypeName(this IEdmTypeReference type)
{
var edmCollectionType = type.Definition as IEdmCollectionType;
if (edmCollectionType == null)
return (type.Definition as IEdmNamedElement)?.Name;
var element1 = edmCollectionType.ElementType.Definition as IEdmNamedElement;
return element1 == null ? null : $"Collection({element1.Name})";
}
}
}