public override void PrecompileCollection <T, TN>()
{
var cacheKey = MappingServiceProvider.CalculateCacheKey(typeof(T), typeof(TN));
if (CollectionMappers.ContainsKey(cacheKey))
{
return;
}
var sourceType = GetCollectionElementType(typeof(T));
var destType = GetCollectionElementType(typeof(TN));
var sourceVariable = Expression.Parameter(typeof(T), "source");
var destVariable = Expression.Parameter(typeof(TN), "dst");
var srcCount = Expression.Call(typeof(Enumerable), "Count", new[] { sourceType }, sourceVariable);
var destCount = Expression.Call(typeof(Enumerable), "Count", new[] { destType }, destVariable);
var conditionToCreateList = Expression.NotEqual(srcCount, destCount);
var notNullCondition = Expression.IfThenElse(conditionToCreateList,
MapCollectionNotCountEquals(typeof(T), typeof(TN), sourceVariable, destVariable),
MapCollectionCountEquals(typeof(T), typeof(TN), sourceVariable, destVariable));
var newCollBlockExp = CompileCollectionInternal <T, TN>(sourceVariable, destVariable);
var result = Expression.IfThenElse(Expression.NotEqual(destVariable, StaticExpressions.NullConstant),
notNullCondition,
newCollBlockExp);
var expressions = new List <Expression> {
result
};
var resultExpression = Expression.Block(new ParameterExpression[] {}, expressions);
var checkSrcForNullExp =
Expression.IfThenElse(Expression.Equal(sourceVariable, StaticExpressions.NullConstant),
Expression.Default(destVariable.Type), resultExpression);
var block = Expression.Block(new ParameterExpression[] {}, checkSrcForNullExp, destVariable);
var lambda = Expression.Lambda <Func <T, TN, TN> >(block, sourceVariable, destVariable);
var compiledFunc = lambda.Compile();
CollectionMappers[cacheKey] = compiledFunc;
}
public override MulticastDelegate MapCollection(long cacheKey)
{
return(CollectionMappers.ContainsKey(cacheKey) ? CollectionMappers[cacheKey] : null);
}