/// <summary>
/// Resolve dependencies on all implementations of a contract.
/// </summary>
/// <param name="site">A tag describing the dependency site.</param>
/// <param name="contract">The contract required by the site.</param>
/// <param name="isPrerequisite">True if the dependency must be satisifed before corresponding exports can be retrieved; otherwise, false.</param>
/// <returns>Dependencies for all implementations of the contact.</returns>
public IEnumerable <CompositionDependency> ResolveDependencies(object site, CompositionContract contract, bool isPrerequisite)
{
var all = GetPromises(contract).ToArray();
var result = new CompositionDependency[all.Length];
for (var i = 0; i < all.Length; ++i)
{
result[i] = CompositionDependency.Satisfied(contract, all[i], isPrerequisite, site);
}
return(result);
}
/// <summary>
/// Resolve an optional dependency on exactly one implemenation of a contract.
/// </summary>
/// <param name="site">A tag describing the dependency site.</param>
/// <param name="contract">The contract required by the site.</param>
/// <param name="isPrerequisite">True if the dependency must be satisifed before corresponding exports can be retrieved; otherwise, false.</param>
/// <param name="dependency">The dependency, or null.</param>
/// <returns>True if the dependency could be resolved; otherwise, false.</returns>
public bool TryResolveOptionalDependency(object site, CompositionContract contract, bool isPrerequisite, out CompositionDependency dependency)
{
var all = GetPromises(contract).ToArray();
if (all.Length == 0)
{
dependency = null;
return(false);
}
if (all.Length != 1)
{
dependency = CompositionDependency.Oversupplied(contract, all, site);
return(true);
}
dependency = CompositionDependency.Satisfied(contract, all[0], isPrerequisite, site);
return(true);
}
