public static Expression <Func <ExportDefinition, bool> > CreateConstraint(string contractName, string requiredTypeIdentity, IEnumerable <KeyValuePair <string, Type> > requiredMetadata, CreationPolicy requiredCreationPolicy)
{
ParameterExpression parameter = Expression.Parameter(typeof(ExportDefinition), "exportDefinition");
Expression constraintBody = ConstraintServices.CreateContractConstraintBody(contractName, parameter);
if (!string.IsNullOrEmpty(requiredTypeIdentity))
{
Expression typeIdentityConstraintBody = ConstraintServices.CreateTypeIdentityContraint(requiredTypeIdentity, parameter);
constraintBody = Expression.AndAlso(constraintBody, typeIdentityConstraintBody);
}
if (requiredMetadata != null)
{
Expression metadataConstraintBody = ConstraintServices.CreateMetadataConstraintBody(requiredMetadata, parameter);
if (metadataConstraintBody != null)
{
constraintBody = Expression.AndAlso(constraintBody, metadataConstraintBody);
}
}
if (requiredCreationPolicy != CreationPolicy.Any)
{
Expression policyConstraintBody = ConstraintServices.CreateCreationPolicyContraint(requiredCreationPolicy, parameter);
constraintBody = Expression.AndAlso(constraintBody, policyConstraintBody);
}
Expression <Func <ExportDefinition, bool> > constraint = Expression.Lambda <Func <ExportDefinition, bool> >(constraintBody, parameter);
return(constraint);
}
public void TryParseConstraint_ConstraintFromCreateConstraintAsConstraintArgument1_CanParse()
{
var expectations = Expectations.GetContractNamesWithEmpty();
foreach (var e in expectations)
{
var constraint = ConstraintServices.CreateConstraint((string)e, null, null, CreationPolicy.Any);
AssertCanParse(constraint, e, new Dictionary <string, Type>());
}
}
public void TryParseConstraint_ConstraintFromCreateConstraintAsConstraintArgument2_CanParse()
{
var expectations = Expectations.GetRequiredMetadata();
foreach (var e in expectations)
{
var constraint = ConstraintServices.CreateConstraint((IEnumerable <KeyValuePair <string, Type> >)e);
AssertCanParse(constraint, (string)null, e);
}
}
public void CreationPolicyConstraint_NoCreationPolicy_ShouldNotMatch()
{
var contractName = "MyContract";
var metadata = new Dictionary <string, object>();
var exportDefinition = new ExportDefinition(contractName, metadata);
var constraint = ConstraintServices.CreateConstraint(contractName, null, null, CreationPolicy.Shared);
var predicate = constraint.Compile();
Assert.IsTrue(predicate(exportDefinition));
}
public void TypeIdentityConstraint_InvalidExportDef_ShouldNotMatch()
{
var contractName = "MyContract";
var typeIdentity = AttributedModelServices.GetTypeIdentity(typeof(ConstraintServicesTests));
var metadata = new Dictionary <string, object>();
var exportDefinition = new ExportDefinition(contractName, metadata);
var constraint = ConstraintServices.CreateConstraint(contractName, typeIdentity, null, CreationPolicy.Any);
var predicate = constraint.Compile();
Assert.IsFalse(predicate(exportDefinition));
}
public void CreationPolicyConstraint_ValidNonMatchingCreationPolicy_ShouldNotMatch()
{
var contractName = "MyContract";
var metadata = new Dictionary <string, object>();
metadata.Add(CompositionConstants.PartCreationPolicyMetadataName, CreationPolicy.NonShared);
var exportDefinition = new ExportDefinition(contractName, metadata);
var constraint = ConstraintServices.CreateConstraint(contractName, null, null, CreationPolicy.Shared);
var predicate = constraint.Compile();
Assert.IsFalse(predicate(exportDefinition));
}
public void TryParseConstraint_ConstraintFromCreateConstraintAsConstraintArgument3_CanParse()
{
var contractNames = Expectations.GetContractNames();
var metadataValues = Expectations.GetRequiredMetadata();
foreach (var contractName in contractNames)
{
foreach (var metadataValue in metadataValues)
{
var constraint = ConstraintServices.CreateConstraint(contractName, null, metadataValue, CreationPolicy.Any);
AssertCanParse(constraint, contractName, metadataValue);
}
}
}
public static Expression <Func <ExportDefinition, bool> > CreateConstraint(IEnumerable <KeyValuePair <string, Type> > requiredMetadata)
{
ParameterExpression parameter = Expression.Parameter(typeof(ExportDefinition), "exportDefinition");
Expression metadataConstraintBody = null;
if (requiredMetadata != null)
{
metadataConstraintBody = ConstraintServices.CreateMetadataConstraintBody(requiredMetadata, parameter);
}
if (metadataConstraintBody != null)
{
return(Expression.Lambda <Func <ExportDefinition, bool> >(metadataConstraintBody, parameter));
}
return(null);
}
