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// NullValueReference.cs
//
// Author:
// Lluis Sanchez Gual <lluis@novell.com>
//
// Copyright (c) 2008 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//
using System;
using Mono.Debugging.Client;
namespace Mono.Debugging.Evaluation
{
public class NullValueReference: ValueReference
{
readonly object type;
object obj;
bool valueCreated;
public NullValueReference (EvaluationContext ctx, object type) : base (ctx)
{
this.type = type;
}
public override object Value {
get {
if (!valueCreated) {
valueCreated = true;
obj = Context.Adapter.CreateNullValue (Context, type);
}
return obj;
}
set {
throw new NotSupportedException();
}
}
public override object Type {
get {
return type;
}
}
public override object ObjectValue {
get {
return null;
}
}
public override string Name {
get {
return "null";
}
}
public override ObjectValueFlags Flags {
get {
return ObjectValueFlags.Literal;
}
}
protected override ObjectValue OnCreateObjectValue (EvaluationOptions options)
{
string tn = Context.Adapter.GetTypeName (GetContext (options), Type);
return Mono.Debugging.Client.ObjectValue.CreateObject (null, new ObjectPath (Name), tn, "null", Flags, null);
}
public override ValueReference GetChild (string name, EvaluationOptions options)
{
return null;
}
public override ObjectValue[] GetChildren (Mono.Debugging.Client.ObjectPath path, int index, int count, EvaluationOptions options)
{
return new ObjectValue [0];
}
}
}
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