public DynamoQuery Filter(params Expression[] conditions)
{
if (_filter == null)
{
if (ExpressionAttributeNames == null)
{
ExpressionAttributeNames = new JsonObject();
}
if (ExpressionAttributeValues == null)
{
ExpressionAttributeValues = new AttributeCollection();
}
_filter = new DynamoExpression(ExpressionAttributeNames, ExpressionAttributeValues);
}
foreach (var condition in conditions)
{
_filter.Add(condition);
}
this.FilterExpression = _filter.Text;
return(this);
}
public static DynamoExpression FromExpression(Expression expression)
{
var result = new DynamoExpression();
result.Add(expression);
return(result);
}
public static DynamoExpression FromExpression(Expression expression)
{
var result = new DynamoExpression();
// TODO: Flatten conjunctions...
result.Add(expression);
return(result);
}
public DynamoQueryExpression(string[] keyNames, Expression[] expressions)
{
this.keyNames = keyNames;
KeyExpression = new DynamoExpression(AttributeNames, AttributeValues);
foreach (var expression in expressions)
{
if (expression is BinaryExpression)
{
var e = (BinaryExpression)expression;
if (IsKey(e.Left.ToString()))
{
KeyExpression.Add(e);
}
else
{
AddFilterExpression(e);
}
}
else if (expression is BetweenExpression)
{
var e = (BetweenExpression)expression;
if (IsKey(e.Property.ToString()))
{
KeyExpression.Add(e);
}
else
{
AddFilterExpression(e);
}
}
else
{
throw new Exception("Unexpected expression type:" + expression);
}
}
}
// TODO: Expand BinaryExpression
public DynamoQueryExpression(string[] keyNames, Expression[] expressions)
{
this.keyNames = keyNames;
KeyExpression = new DynamoExpression(AttributeNames, AttributeValues);
foreach (Expression expression in expressions)
{
if (expression is BinaryExpression be)
{
if (IsKey(be.Left.ToString() !))
{
KeyExpression.Add(be);
}
else
{
AddFilterExpression(be);
}
}
