public static EntityExpression Create(EntityFieldExpression entityFieldExpression, int offset)
{
var typeInfo = entityFieldExpression.PersistentType;
var fields = new List <PersistentFieldExpression>();
var keyExpression = KeyExpression.Create(typeInfo, offset);
fields.Add(keyExpression);
foreach (var nestedField in typeInfo.Fields)
{
fields.Add(BuildNestedFieldExpression(nestedField, offset));
}
var result = new EntityExpression(typeInfo, keyExpression, null, entityFieldExpression.DefaultIfEmpty)
{
Fields = fields
};
if (entityFieldExpression.OuterParameter == null)
{
return(result);
}
return((EntityExpression)result.BindParameter(entityFieldExpression.OuterParameter, new Dictionary <Expression, Expression>()));
}
public Expression Remap(int offset, Dictionary <Expression, Expression> processedExpressions)
{
if (!CanRemap)
{
return(this);
}
Expression value;
if (processedExpressions.TryGetValue(this, out value))
{
return(value);
}
var keyExpression = (KeyExpression)Key.Remap(offset, processedExpressions);
var result = new EntityExpression(PersistentType, keyExpression, OuterParameter, DefaultIfEmpty);
processedExpressions.Add(this, result);
result.IsNullable = IsNullable;
result.Fields = Fields
.Select(f => f.Remap(offset, processedExpressions))
.Cast <PersistentFieldExpression>()
.ToList();
return(result);
}
public ItemProjectorExpression EnsureEntityIsJoined()
{
var dataSource = DataSource;
var newItem = new ExtendedExpressionReplacer(e => {
if (e is EntityExpression)
{
var entityExpression = (EntityExpression)e;
var typeInfo = entityExpression.PersistentType;
if (typeInfo.Fields.All(fieldInfo => entityExpression.Fields.Any(entityField => entityField.Name == fieldInfo.Name)))
{
return(entityExpression);
}
var joinedIndex = typeInfo.Indexes.PrimaryIndex;
var joinedRs = joinedIndex.GetQuery().Alias(Context.GetNextAlias());
var keySegment = entityExpression.Key.Mapping;
var keyPairs = keySegment.GetItems()
.Select((leftIndex, rightIndex) => new Pair <int>(leftIndex, rightIndex))
.ToArray();
var offset = dataSource.Header.Length;
var dataSourceAsJoin = dataSource as JoinProvider;
dataSource = entityExpression.IsNullable || (dataSourceAsJoin != null && dataSourceAsJoin.JoinType == JoinType.LeftOuter)
? dataSource.LeftJoin(joinedRs, keyPairs)
: dataSource.Join(joinedRs, keyPairs);
EntityExpression.Fill(entityExpression, offset);
return(entityExpression);
}
if (e is EntityFieldExpression)
{
var entityFieldExpression = (EntityFieldExpression)e;
if (entityFieldExpression.Entity != null)
{
return(entityFieldExpression.Entity);
}
var typeInfo = entityFieldExpression.PersistentType;
var joinedIndex = typeInfo.Indexes.PrimaryIndex;
var joinedRs = joinedIndex.GetQuery().Alias(Context.GetNextAlias());
var keySegment = entityFieldExpression.Mapping;
var keyPairs = keySegment.GetItems()
.Select((leftIndex, rightIndex) => new Pair <int>(leftIndex, rightIndex))
.ToArray();
var offset = dataSource.Header.Length;
var dataSourceAsJoin = dataSource as JoinProvider;
dataSource = entityFieldExpression.IsNullable || (dataSourceAsJoin != null && dataSourceAsJoin.JoinType == JoinType.LeftOuter)
? dataSource.LeftJoin(joinedRs, keyPairs)
: dataSource.Join(joinedRs, keyPairs);
entityFieldExpression.RegisterEntityExpression(offset);
return(entityFieldExpression.Entity);
}
if (e is FieldExpression)
{
var fe = (FieldExpression)e;
if (fe.ExtendedType == ExtendedExpressionType.Field)
{
return(fe.RemoveOwner());
}
}
return(null);
})
.Replace(Item);
return(new ItemProjectorExpression(newItem, dataSource, Context));
}
public void RegisterEntityExpression(int offset)
{
Entity = EntityExpression.Create(this, offset);
Entity.IsNullable = IsNullable;
}
public ItemProjectorExpression EnsureEntityIsJoined()
{
var dataSource = DataSource;
var newItem = new ExtendedExpressionReplacer(e => {
if (e is EntityExpression entityExpression)
{
var typeInfo = entityExpression.PersistentType;
// Converted from LINQ to get rid of 2 closure allocations
var all = true;
foreach (var fieldInfo in typeInfo.Fields)
{
var isUsedInEntityExpression = false;
foreach (var entityField in entityExpression.Fields)
{
if (string.Equals(entityField.Name, fieldInfo.Name, StringComparison.Ordinal))
{
isUsedInEntityExpression = true;
break;
}
}
if (!isUsedInEntityExpression)
{
all = false;
break;
}
}
if (all)
{
return(entityExpression);
}
var joinedIndex = typeInfo.Indexes.PrimaryIndex;
var joinedRs = joinedIndex.GetQuery().Alias(Context.GetNextAlias());
var keySegment = entityExpression.Key.Mapping;
var keyPairs = new Pair <int> [keySegment.Length];
var rightIndex = 0;
foreach (var leftIndex in keySegment.GetItems())
{
keyPairs[rightIndex] = new Pair <int>(leftIndex, rightIndex);
rightIndex++;
}
var offset = dataSource.Header.Length;
dataSource = entityExpression.IsNullable ||
(dataSource is JoinProvider dataSourceAsJoin && dataSourceAsJoin.JoinType == JoinType.LeftOuter)
? dataSource.LeftJoin(joinedRs, keyPairs)
: dataSource.Join(joinedRs, keyPairs);
EntityExpression.Fill(entityExpression, offset);
return(entityExpression);
}
if (e is EntityFieldExpression entityFieldExpression)
{
if (entityFieldExpression.Entity != null)
{
return(entityFieldExpression.Entity);
}
var typeInfo = entityFieldExpression.PersistentType;
var joinedIndex = typeInfo.Indexes.PrimaryIndex;
var joinedRs = joinedIndex.GetQuery().Alias(Context.GetNextAlias());
var keySegment = entityFieldExpression.Mapping;
var keyPairs = new Pair <int> [keySegment.Length];
var rightIndex = 0;
foreach (var leftIndex in keySegment.GetItems())
{
keyPairs[rightIndex] = new Pair <int>(leftIndex, rightIndex);
rightIndex++;
}
var offset = dataSource.Header.Length;
dataSource = entityFieldExpression.IsNullable ||
(dataSource is JoinProvider dataSourceAsJoin && dataSourceAsJoin.JoinType == JoinType.LeftOuter)
? dataSource.LeftJoin(joinedRs, keyPairs)
: dataSource.Join(joinedRs, keyPairs);
entityFieldExpression.RegisterEntityExpression(offset);
return(entityFieldExpression.Entity);
}
if (e is FieldExpression fe && fe.ExtendedType == ExtendedExpressionType.Field)
{
return(fe.RemoveOwner());
}
return(null);
})
.Replace(Item);
return(new ItemProjectorExpression(newItem, dataSource, Context));
}
