protected DdbConverter <TProperty> GetPropertyConverter <TProperty>(DdbExpressionVisitor visitor)
{
return((DdbConverter <TProperty>)visitor.ClassInfo.ConverterBase);
// var propertyName = visitor.CachedAttributeNames[^1];
// if (!visitor.ClassInfo.PropertiesMap.TryGetValue(propertyName, out var propertyInfo))
// throw new DdbException(
// $"Property {propertyName} does not exist in entity {visitor.ClassInfo.Type.Name} or it's not marked by {nameof(DynamoDbPropertyAttribute)} attribute");
//
// return ((DdbPropertyInfo<TProperty>) propertyInfo).Converter;
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "#a = :v0"
visitor.Visit <TEntity>(Expression);
WriteEncodedExpressionName(visitor.Builder, _useSize, ref builder);
builder.Append(" = :v");
builder.Append(valuesCount++);
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "SET #a = #b + #c"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
builder.Append(" = ");
visitor.Visit <TEntity>(_left);
builder.Append(visitor.Builder);
AppendMathOperatorExpression(ref builder);
visitor.Visit <TEntity>(_right);
builder.Append(visitor.Builder);
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "#a IN (:v0, :v1, :v2)"
visitor.Visit <TEntity>(Expression);
WriteEncodedExpressionName(visitor.Builder, _useSize, ref builder);
builder.Append(" IN (");
for (var i = 0; i < _values.Length; i++)
{
if (i > 0)
{
builder.Append(", ");
}
builder.Append(":v");
builder.Append(valuesCount++);
}
builder.Append(')');
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "SET #a = list_append(if_not_exists(#b, :v0),if_not_exists(#c, :v1))"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
builder.Append(" = list_append(");
WriteIfNotExistsBlock <TEntity>(ref builder, visitor, _left, ref valuesCount);
builder.Append(',');
WriteIfNotExistsBlock <TEntity>(ref builder, visitor, _right, ref valuesCount);
builder.Append(')');
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "SET #a = #b + if_not_exists(#c, :v0)"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
builder.Append(" = ");
visitor.Visit <TEntity>(_left);
builder.Append(visitor.Builder);
AppendMathOperatorExpression(ref builder);
WriteIfNotExistsBlock <TEntity>(ref builder, visitor, _right, ref valuesCount);
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "SET #a = list_append(#b,#c)"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
builder.Append(" = list_append(");
visitor.Visit <TEntity>(_left);
builder.Append(visitor.Builder);
builder.Append(',');
visitor.Visit <TEntity>(_right);
builder.Append(visitor.Builder);
builder.Append(')');
}
protected DdbConverter <TProperty> GetPropertyConverter <TProperty>(DdbExpressionVisitor visitor, bool useSize) => useSize?visitor.Metadata.GetOrAddConverter <TProperty>() : (DdbConverter <TProperty>)visitor.ClassInfo.ConverterBase;
internal abstract void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor);
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "REMOVE #a"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// attribute_not_exists(#a)
visitor.Visit <TEntity>(Expression);
builder.Append("attribute_not_exists(");
builder.Append(visitor.Builder);
builder.Append(')');
}
protected override ValueTask WriteDataAsync(DdbWriter writer)
{
writer.JsonWriter.WriteStartObject();
var writeState = 0;
var projectionWritten = false;
foreach (var node in _node)
{
switch (node.Type)
{
case BuilderNodeType.PrimaryKey:
((PrimaryKeyNodeBase)node).Write(in writer, _classInfo, ref writeState);
break;
case BuilderNodeType.ProjectedAttributes:
if (projectionWritten)
{
break;
}
// ReSharper disable once StackAllocInsideLoop
var builder = new NoAllocStringBuilder(stackalloc char[NoAllocStringBuilder.MaxStackAllocSize], true);
try
{
var visitor = new DdbExpressionVisitor(_context.Config.Metadata);
writer.JsonWriter.WriteProjectedAttributes(node, ref builder, visitor, _context.Config.Metadata);
if (visitor.CachedAttributeNames.Count > 0)
{
writer.JsonWriter.WriteExpressionAttributeNames(ref builder, visitor.CachedAttributeNames);
}
projectionWritten = true;
}
finally
{
builder.Dispose();
}
break;
case BuilderNodeType.TableName:
((TableNameNode)node).WriteTableName(in writer, ref writeState, _context.Config.TableNamePrefix);
break;
default:
node.WriteValue(in writer, ref writeState);
break;
}
}
if (!writeState.IsBitSet(NodeBits.TableName))
{
writer.JsonWriter.WriteTableName(_context.Config.TableNamePrefix, _classInfo.TableName !);
}
writer.JsonWriter.WriteEndObject();
return(new ValueTask());
}
