Cosmos/source/MPF/12.0/EnumDependencies.cs

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using System;
using System.Collections.Generic;
using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell.Interop;

namespace Microsoft.VisualStudio.Project
{

    public class EnumDependencies : IVsEnumDependencies
    {
        private List<IVsDependency> dependencyList = new List<IVsDependency>();

        private uint nextIndex;

        public EnumDependencies(IList<IVsDependency> dependencyList)
        {
            if (dependencyList == null)
            {
                throw new ArgumentNullException("dependencyList");
            }

            foreach(IVsDependency dependency in dependencyList)
            {
                this.dependencyList.Add(dependency);
            }
        }

        public EnumDependencies(IList<IVsBuildDependency> dependencyList)
        {
            if (dependencyList == null)
            {
                throw new ArgumentNullException("dependencyList");
            }

            foreach(IVsBuildDependency dependency in dependencyList)
            {
                this.dependencyList.Add(dependency);
            }
        }

        public int Clone(out IVsEnumDependencies enumDependencies)
        {
            enumDependencies = new EnumDependencies(this.dependencyList);
            ErrorHandler.ThrowOnFailure(enumDependencies.Skip(this.nextIndex));
            return VSConstants.S_OK;
        }

        public int Next(uint elements, IVsDependency[] dependencies, out uint elementsFetched)
        {
            elementsFetched = 0;
            if (dependencies == null)
            {
                throw new ArgumentNullException("dependencies");
            }
            
            uint fetched = 0;
            int count = this.dependencyList.Count;

            while(this.nextIndex < count && elements > 0 && fetched < count)
            {
                dependencies[fetched] = this.dependencyList[(int)this.nextIndex];
                this.nextIndex++;
                fetched++;
                elements--;

            }

            elementsFetched = fetched;

            // Did we get 'em all?
            return (elements == 0 ? VSConstants.S_OK : VSConstants.S_FALSE);
        }

        public int Reset()
        {
            this.nextIndex = 0;
            return VSConstants.S_OK;
        }

        public int Skip(uint elements)
        {
            this.nextIndex += elements;
            uint count = (uint)this.dependencyList.Count;

            if(this.nextIndex > count)
            {
                this.nextIndex = count;
                return VSConstants.S_FALSE;
            }

            return VSConstants.S_OK;
        }
    }
}