protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var isGroup = methodCall.Method.Name == "GroupJoin";
var outerContext = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0], buildInfo.SelectQuery));
var innerContext = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[1], new SelectQuery()));
var context = new SubQueryContext(outerContext);
innerContext = isGroup ? new GroupJoinSubQueryContext(innerContext) : new SubQueryContext(innerContext);
var join = isGroup ? innerContext.SelectQuery.WeakLeftJoin() : innerContext.SelectQuery.InnerJoin();
var sql = context.SelectQuery;
sql.From.Tables[0].Joins.Add(join.JoinedTable);
var selector = (LambdaExpression)methodCall.Arguments[4].Unwrap();
context.SetAlias(selector.Parameters[0].Name);
innerContext.SetAlias(selector.Parameters[1].Name);
var outerKeyLambda = ((LambdaExpression)methodCall.Arguments[2].Unwrap());
var innerKeyLambda = ((LambdaExpression)methodCall.Arguments[3].Unwrap());
var outerKeySelector = outerKeyLambda.Body.Unwrap();
var innerKeySelector = innerKeyLambda.Body.Unwrap();
var outerParent = context.Parent;
var innerParent = innerContext.Parent;
var outerKeyContext = new ExpressionContext(buildInfo.Parent, context, outerKeyLambda);
var innerKeyContext = new InnerKeyContext(buildInfo.Parent, innerContext, innerKeyLambda);
// Make join and where for the counter.
//
if (outerKeySelector.NodeType == ExpressionType.New)
{
var new1 = (NewExpression)outerKeySelector;
var new2 = (NewExpression)innerKeySelector;
for (var i = 0; i < new1.Arguments.Count; i++)
{
var arg1 = new1.Arguments[i];
var arg2 = new2.Arguments[i];
BuildJoin(builder, join, outerKeyContext, arg1, innerKeyContext, arg2);
}
}
else if (outerKeySelector.NodeType == ExpressionType.MemberInit)
{
var mi1 = (MemberInitExpression)outerKeySelector;
var mi2 = (MemberInitExpression)innerKeySelector;
for (var i = 0; i < mi1.Bindings.Count; i++)
{
if (mi1.Bindings[i].Member != mi2.Bindings[i].Member)
{
throw new LinqException("List of member inits does not match for entity type '{0}'.".Args(outerKeySelector.Type));
}
var arg1 = ((MemberAssignment)mi1.Bindings[i]).Expression;
var arg2 = ((MemberAssignment)mi2.Bindings[i]).Expression;
BuildJoin(builder, join, outerKeyContext, arg1, innerKeyContext, arg2);
}
}
else
{
BuildJoin(builder, join, outerKeyContext, outerKeySelector, innerKeyContext, innerKeySelector);
}
builder.ReplaceParent(outerKeyContext, outerParent);
builder.ReplaceParent(innerKeyContext, innerParent);
if (isGroup)
{
var inner = (GroupJoinSubQueryContext)innerContext;
inner.Join = join.JoinedTable;
inner.GetSubQueryContext = () =>
GetSubQueryContext(builder, methodCall, buildInfo, sql,
innerKeyLambda, outerKeySelector, innerKeySelector, outerKeyContext);
return(new GroupJoinContext(
buildInfo.Parent, selector, context, inner, methodCall.Arguments[1], outerKeyLambda, innerKeyLambda));
}
return(new JoinContext(buildInfo.Parent, selector, context, innerContext)
#if DEBUG
{
MethodCall = methodCall
}
#endif
);
}
public override IBuildContext GetContext(Expression expression, int level, BuildInfo buildInfo)
{
if (expression == null)
{
if (buildInfo.CreateSubQuery)
{
Join.IsWeak = true;
var queryBuild = GetSubQueryContext();
//queryBuild.Parent = Context.Parent;
return(queryBuild);
}
return(this);
}
return(base.GetContext(expression, level, buildInfo));
}
protected override SequenceConvertInfo Convert(
ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo, ParameterExpression param)
{
return(null);
}
IBuildContext GetSubQueryContext(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo,
SelectQuery sql,
LambdaExpression innerKeyLambda,
Expression outerKeySelector,
Expression innerKeySelector,
IBuildContext outerKeyContext)
{
var subQueryContext = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[1], new SelectQuery()));
subQueryContext = new SubQueryContext(subQueryContext);
var subQueryParent = subQueryContext.Parent;
var subQueryKeyContext = new ExpressionContext(buildInfo.Parent, subQueryContext, innerKeyLambda);
// Process SubQuery.
//
var subQuerySql = ((SubQueryContext)subQueryContext).SelectQuery;
// Make join and where for the counter.
//
if (outerKeySelector.NodeType == ExpressionType.New)
{
var new1 = (NewExpression)outerKeySelector;
var new2 = (NewExpression)innerKeySelector;
for (var i = 0; i < new1.Arguments.Count; i++)
{
var arg1 = new1.Arguments[i];
var arg2 = new2.Arguments[i];
BuildSubQueryJoin(builder, outerKeyContext, arg1, arg2, subQueryKeyContext, subQuerySql);
}
}
else if (outerKeySelector.NodeType == ExpressionType.MemberInit)
{
var mi1 = (MemberInitExpression)outerKeySelector;
var mi2 = (MemberInitExpression)innerKeySelector;
for (var i = 0; i < mi1.Bindings.Count; i++)
{
if (mi1.Bindings[i].Member != mi2.Bindings[i].Member)
{
throw new LinqException("List of member inits does not match for entity type '{0}'.".Args(outerKeySelector.Type));
}
var arg1 = ((MemberAssignment)mi1.Bindings[i]).Expression;
var arg2 = ((MemberAssignment)mi2.Bindings[i]).Expression;
BuildSubQueryJoin(builder, outerKeyContext, arg1, arg2, subQueryKeyContext, subQuerySql);
}
}
else
{
BuildSubQueryJoin(builder, outerKeyContext, outerKeySelector, innerKeySelector, subQueryKeyContext, subQuerySql);
}
builder.ReplaceParent(subQueryKeyContext, subQueryParent);
subQuerySql.ParentSelect = sql;
subQuerySql.Select.Columns.Clear();
return(subQueryContext);
}
protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
if (!methodCall.IsQueryable("Join", "GroupJoin") || methodCall.Arguments.Count != 5)
{
return(false);
}
var body = ((LambdaExpression)methodCall.Arguments[2].Unwrap()).Body.Unwrap();
if (body.NodeType == ExpressionType.MemberInit)
{
var mi = (MemberInitExpression)body;
bool throwExpr;
if (mi.NewExpression.Arguments.Count > 0 || mi.Bindings.Count == 0)
{
throwExpr = true;
}
else
{
throwExpr = mi.Bindings.Any(b => b.BindingType != MemberBindingType.Assignment);
}
if (throwExpr)
{
throw new NotSupportedException("Explicit construction of entity type '{0}' in join is not allowed.".Args(body.Type));
}
}
return(true);
}
protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
return(methodCall.IsQueryable("AsQueryable"));
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
return(builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0])));
}