Class MappingOpExtract.MyMappingRelation
java.lang.Object
se.liu.ida.hefquin.mappings.algebra.ops.MappingOpExtract.MyMappingRelation
- All Implemented Interfaces:
MappingRelation
- Enclosing class:
MappingOpExtract<DDS extends DataObject,DC1 extends DataObject, DC2 extends DataObject, QL1 extends Query, QL2 extends Query>
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Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionReturns the set of attributes for which the tuples in this relation have values.
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Field Details
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schema
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cursor
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Constructor Details
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MyMappingRelation
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Method Details
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getSchema
Description copied from interface:MappingRelationReturns the set of attributes for which the tuples in this relation have values. The returned list can be assumed to be duplicate free.The order of the attributes in the returned list is relevant when accessing the values of the tuples via a cursor for this relation (see
MappingRelationCursor.getValueOfCurrentTuple(int)).- Specified by:
getSchemain interfaceMappingRelation
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getCursor
- Specified by:
getCursorin interfaceMappingRelation
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