protected abstract IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo);
protected abstract SequenceConvertInfo Convert(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo, ParameterExpression param);
public bool IsSequence(ExpressionBuilder builder, BuildInfo buildInfo)
{
return
(builder.IsSequence(new BuildInfo(buildInfo, ((MethodCallExpression)buildInfo.Expression).Arguments[0])));
}
protected abstract bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo);
public IBuildContext BuildSequence(ExpressionBuilder builder, BuildInfo buildInfo)
{
return(BuildMethodCall(builder, (MethodCallExpression)buildInfo.Expression, buildInfo));
}
public SequenceConvertInfo Convert(ExpressionBuilder builder, BuildInfo buildInfo, ParameterExpression param)
{
return(Convert(builder, (MethodCallExpression)buildInfo.Expression, buildInfo, param));
}
public SequenceConvertInfo Convert(ExpressionBuilder builder, BuildInfo buildInfo, ParameterExpression param)
{
return(null);
}
private IBuildContext GetSubQueryContext(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo,
ISelectQuery 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).Select;
// 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 SequenceConvertInfo Convert(
ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo, ParameterExpression param)
{
return(null);
}
public bool CanBuild(ExpressionBuilder builder, BuildInfo buildInfo)
{
return(buildInfo.Expression is ChangeTypeExpression);
}
protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo)
{
return(methodCall.Arguments.Count == 2 && methodCall.IsQueryable("Concat", "Union"));
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo)
{
return(builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0])));
}
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.Select.WeakLeftJoin() : innerContext.Select.InnerJoin();
var sql = context.Select;
sql.From.Tables.First.Value.Joins.AddLast(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
);
}
protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo)
{
return(methodCall.IsQueryable("Skip", "Take"));
}
private ISequenceBuilder GetBuilder(ExpressionBuilder builder, BuildInfo buildInfo)
{
return(_builder ?? (_builder = builder.GetBuilder(buildInfo)));
}
protected override SequenceConvertInfo Convert(
ExpressionBuilder builder, MethodCallExpression originalMethodCall, BuildInfo buildInfo,
ParameterExpression param)
{
var methodCall = originalMethodCall;
var selector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var info = builder.ConvertSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]), selector.Parameters[0]);
if (info != null)
{
methodCall = (MethodCallExpression)methodCall.Transform(
ex => ConvertMethod(methodCall, 0, info, selector.Parameters[0], ex));
selector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
}
if (param != null && !ReferenceEquals(param, builder.SequenceParameter))
{
var list =
GetExpressions(selector.Parameters[0], param, 0, selector.Body.Unwrap())
.OrderByDescending(path => path.Level)
.ToList();
if (list.Count > 0)
{
var plist = list.Where(e => ReferenceEquals(e.Expr, selector.Parameters[0])).ToList();
if (plist.Count > 1)
{
list = list.Except(plist.Skip(1)).ToList();
}
var p = plist.FirstOrDefault();
if (p == null)
{
var types = methodCall.Method.GetGenericArguments();
var mgen = methodCall.Method.GetGenericMethodDefinition();
var btype = typeof(ExpressionHoder <,>).MakeGenericType(types[0], selector.Body.Type);
var fields = btype.GetFieldsEx();
var pold = selector.Parameters[0];
var psel = Expression.Parameter(types[0], pold.Name);
methodCall = Expression.Call(
methodCall.Object,
mgen.MakeGenericMethod(types[0], btype),
methodCall.Arguments[0],
Expression.Lambda(
Expression.MemberInit(
Expression.New(btype),
Expression.Bind(fields[0], psel),
Expression.Bind(fields[1], selector.Body.Transform(e => e == pold ? psel : e))),
psel));
selector = (LambdaExpression)methodCall.Arguments[1].Unwrap();
param = Expression.Parameter(selector.Body.Type, param.Name);
list.Add(new SequenceConvertPath
{
Path = param,
Expr = Expression.MakeMemberAccess(param, fields[1]),
Level = 1
});
var expr = Expression.MakeMemberAccess(param, fields[0]);
foreach (var t in list)
{
t.Expr = t.Expr.Transform(ex => ReferenceEquals(ex, pold) ? expr : ex);
}
return(new SequenceConvertInfo
{
Parameter = param,
Expression = methodCall,
ExpressionsToReplace = list
});
}
if (info?.ExpressionsToReplace != null)
{
foreach (var path in info.ExpressionsToReplace)
{
path.Path = path.Path.Transform(e => ReferenceEquals(e, info.Parameter) ? p.Path : e);
path.Expr = path.Expr.Transform(e => ReferenceEquals(e, info.Parameter) ? p.Path : e);
path.Level += p.Level;
list.Add(path);
}
list = list.OrderByDescending(path => path.Level).ToList();
}
if (list.Count > 1)
{
return(new SequenceConvertInfo
{
Parameter = param,
Expression = methodCall,
ExpressionsToReplace = list
.Where(e => !ReferenceEquals(e, p))
.Select(ei =>
{
ei.Expr = ei.Expr.Transform(e => ReferenceEquals(e, p.Expr) ? p.Path : e);
return ei;
})
.ToList()
});
}
}
}
if (!ReferenceEquals(methodCall, originalMethodCall))
{
return new SequenceConvertInfo
{
Parameter = param,
Expression = methodCall
}
}
;
return(null);
}
protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall,
BuildInfo buildInfo)
{
return(methodCall.IsQueryable("Where", "Having"));
}
