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)
{
// "#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)
{
// attribute_not_exists(#a)
visitor.Visit <TEntity>(Expression);
builder.Append("attribute_not_exists(");
builder.Append(visitor.Builder);
builder.Append(')');
}
internal override void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor)
{
// "SET #a = if_not_exists(#b, :v0) + if_not_exists(#c, :v1)"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
builder.Append(" = ");
WriteIfNotExistsBlock <TEntity>(ref builder, visitor, _left, ref valuesCount);
AppendMathOperatorExpression(ref builder);
WriteIfNotExistsBlock <TEntity>(ref builder, visitor, _right, ref valuesCount);
}
protected void AppendMathOperatorExpression(ref NoAllocStringBuilder builder)
{
switch (_mathOperator)
{
case AssignMathOperator.Plus:
builder.Append(" + ");
break;
case AssignMathOperator.Minus:
builder.Append(" - ");
break;
default:
throw new ArgumentOutOfRangeException(nameof(_mathOperator), "Specified math operator is not supported");
}
}
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)
{
// "SET #a = list_append(:v0, if_not_exists(#b, :v1))"
visitor.Visit <TEntity>(Expression);
builder.Append(visitor.Builder);
builder.Append(" = list_append(");
builder.Append(":v");
builder.Append(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 = 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(')');
}
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(')');
}
/// <returns> /// The first value is the string to sign, the second value is the credentials scope. /// </returns> public static void Build(ref NoAllocStringBuilder builder, in SigningMetadata metadata)
protected void WriteEncodedExpressionName(StringBuilder encodedExpressionName, bool useSize, ref NoAllocStringBuilder builder)
{
if (useSize)
{
builder.Append("size(");
builder.Append(encodedExpressionName);
builder.Append(')');
}
else
{
builder.Append(encodedExpressionName);
}
}
internal abstract void WriteExpressionStatement(ref NoAllocStringBuilder builder, ref int valuesCount, DdbExpressionVisitor visitor);
public static string Build(ref NoAllocStringBuilder builder, ref NoAllocStringBuilder signedHeadersBuilder, in SigningMetadata metadata)