/// <summary>
/// Returns all exports that match the conditions of the specified import.
/// </summary>
/// <param name="definition">
/// The <see cref="ImportDefinition"/> that defines the conditions of the
/// <see cref="Export"/> objects to get.
/// </param>
/// <result>
/// An <see cref="IEnumerable{T}"/> of <see cref="Export"/> objects that match
/// the conditions defined by <see cref="ImportDefinition"/>, if found; otherwise, an
/// empty <see cref="IEnumerable{T}"/>.
/// </result>
/// <exception cref="ArgumentNullException">
/// <paramref name="definition"/> is <see langword="null"/>.
/// </exception>
/// <exception cref="ImportCardinalityMismatchException">
/// <para>
/// <see cref="ImportDefinition.Cardinality"/> is <see cref="ImportCardinality.ExactlyOne"/> and
/// there are zero <see cref="Export"/> objects that match the conditions of the specified
/// <see cref="ImportDefinition"/>.
/// </para>
/// -or-
/// <para>
/// <see cref="ImportDefinition.Cardinality"/> is <see cref="ImportCardinality.ZeroOrOne"/> or
/// <see cref="ImportCardinality.ExactlyOne"/> and there are more than one <see cref="Export"/>
/// objects that match the conditions of the specified <see cref="ImportDefinition"/>.
/// </para>
/// </exception>
public IEnumerable<Export> GetExports(ImportDefinition definition, AtomicComposition atomicComposition)
{
Requires.NotNull(definition, "definition");
Contract.Ensures(Contract.Result<IEnumerable<Export>>() != null);
IEnumerable<Export> exports;
ExportCardinalityCheckResult result = this.TryGetExportsCore(definition, atomicComposition, out exports);
switch(result)
{
case ExportCardinalityCheckResult.Match:
return exports;
case ExportCardinalityCheckResult.NoExports:
throw new ImportCardinalityMismatchException(string.Format(CultureInfo.CurrentCulture, Strings.CardinalityMismatch_NoExports, definition.ToString()));
default:
Assumes.IsTrue(result == ExportCardinalityCheckResult.TooManyExports);
throw new ImportCardinalityMismatchException(string.Format(CultureInfo.CurrentCulture, Strings.CardinalityMismatch_TooManyExports, definition.ToString()));
}
}
private void DumpImport(ComposablePartDefinition part, ImportDefinition i)
{
Dump(" Import: " + i.ToString());
}
public void ToString_ValueAsConstraintArgument_ShouldReturnConstraintProperty()
{
var expectations = new ExpectationCollection<Expression<Func<ExportDefinition, bool>>, string>();
expectations.Add(d => d.ContractName == "ContractName", @"d.ContractName ==? ""ContractName""");
expectations.Add(d => d.ContractName.Equals("ContractName"), @"d.ContractName.Equals\(""ContractName""\)");
expectations.Add(d => (string)d.Metadata["Name"] == "Value", @"Convert\(d.Metadata.get_Item\(""Name""\)\) ==? ""Value""");
expectations.Add(d => true, "True");
foreach (var e in expectations)
{
var item = new ImportDefinition(e.Input, "", ImportCardinality.ExactlyOne, false, false);
Assert.IsTrue(Regex.IsMatch(item.ToString(), e.Output));
}
}