InvokeResult.cs

Go to the documentation of this file.

// 
//  Copyright 2010-2015 Deveel
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//

using System;
using System.Collections.Generic;
using System.Linq;

namespace Deveel.Data.Routines {
    public sealed class InvokeResult {
        private Dictionary<string, DataObject> outputValues;

        private InvokeResult(InvokeContext context, DataObject returnValue, bool hasReturn) {
            Context = context;
            ReturnValue = returnValue;
            HasReturnValue = hasReturn;
        }

        internal InvokeResult(InvokeContext context) 
            : this(context, DataObject.Null(), false) {
        }

        internal InvokeResult(InvokeContext context, DataObject returnValue)
            : this(context, returnValue, true) {
        }

        public InvokeContext Context { get; private set; }

        public DataObject ReturnValue { get; private set; }

        public bool HasReturnValue { get; private set; }

        public bool HasOutputParameters {
            get { return outputValues != null && outputValues.Count > 0; }
        }

        public IDictionary<string, DataObject> OutputParameters {
            get {
                if (outputValues == null)
                    return new Dictionary<string, DataObject>();

                return outputValues.ToDictionary(x => x.Key, y => y.Value);
            }
        }  

        internal void SetOutputParameter(string name, DataObject value) {
            if (Context.RoutineType != RoutineType.Procedure)
                throw new Exception("Cannot set an output parameter value for a function.");

            if (outputValues == null)
                outputValues = new Dictionary<string, DataObject>();

            outputValues[name] = value;
        }
    }
}