Package gavo :: Package adql :: Module fieldinfos :: Class FieldInfos

Class FieldInfos

object --+
         |
        FieldInfos

Known Subclasses:

A base class for field annotations.

Subclasses of those are attached to physical tables, joins, and subqueries.

The information on columns is kept in two places:

seq -- a sequence of attributes of the columns in the order in which they are selected
columns -- maps column names to attributes or None if a column name is not unique. Column names are normalized by lowercasing here (which, however, does not affect utils.QuotedNames).

A FieldInfos object is instanciated with the object it will annotate, and the annotation (i.e., setting of the fieldInfos attribute on the parent) will happen during instanciation.

Instance Methods

__init__(self, parent, context)
x.__init__(...) initializes x; see help(type(x)) for signature

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__repr__(self)
repr(x)

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locateTable(self, refName)
returns a table instance matching the node.TableName refName.

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addColumn(self, label, info)
adds a new visible column to this info.

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getFieldInfo(self, colName, refName=None)
returns a FieldInfo object for colName.

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assertIsCompatible(self, other)
raises an IncompatibleTables if the FieldInfos other have different length or names from self.

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Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __setattr__, __sizeof__, __str__, __subclasshook__