Package com.mckoi.database
Class NaturallyJoinedTable
- java.lang.Object
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- com.mckoi.database.Table
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- com.mckoi.database.JoinedTable
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- com.mckoi.database.NaturallyJoinedTable
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- All Implemented Interfaces:
TableDataSource
public final class NaturallyJoinedTable extends JoinedTable
A table that is the cartesian product of two tables. This provides better memory-use and efficiency than a materialized table backed by a VirtualTable.- Author:
- Tobias Downer
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Field Summary
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Fields inherited from class com.mckoi.database.JoinedTable
column_filter, column_scheme, column_table, reference_list
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Fields inherited from class com.mckoi.database.Table
DEBUG_QUERY
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Constructor Summary
Constructors Constructor Description NaturallyJoinedTable(Table left, Table right)
Constructs the table.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getRowCount()
Returns the number of rows stored in the table.protected void
resolveAllRowsForTableAt(IntegerVector row_set, int table_num)
Given an IntegerVector that represents a list of pointers to rows in this table, this resolves the rows to row indexes in the given parent table.protected int
resolveRowForTableAt(int row_number, int table_num)
Given a row and a table index (to a parent reference table), this will return the row index in the given parent table for the given row.-
Methods inherited from class com.mckoi.database.JoinedTable
findFieldName, getCellContents, getColumnCount, getDatabase, getDataTableDef, getReferenceTables, getResolvedVariable, hasRootsLocked, init, lockRoot, printGraph, rowEnumeration, unlockRoot
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Methods inherited from class com.mckoi.database.Table
all, allColumnMatchesValue, any, columnContainsCell, columnContainsValue, columnMatchesValue, columnMerge, compareCells, Debug, distinct, distinct, dumpTo, emptySelect, exhaustiveSelect, fastFindFieldName, getColumnDefAt, getColumnScheme, getFirstCellContent, getFirstCellContent, getLastCellContent, getLastCellContent, getSingleCellContent, getSingleCellContent, getSystem, getTableAccessState, getTTypeForColumn, getTTypeForColumn, join, orderByColumn, orderByColumn, orderByColumn, orderByColumns, orderedRowList, outside, rangeSelect, selectAll, selectAll, selectFirst, selectLast, selectRange, selectRest, simpleJoin, simpleSelect, singleRowSelect, toMap, toString, union
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Method Detail
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getRowCount
public int getRowCount()
Description copied from class:Table
Returns the number of rows stored in the table.- Specified by:
getRowCount
in interfaceTableDataSource
- Specified by:
getRowCount
in classTable
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resolveRowForTableAt
protected int resolveRowForTableAt(int row_number, int table_num)
Description copied from class:JoinedTable
Given a row and a table index (to a parent reference table), this will return the row index in the given parent table for the given row.- Specified by:
resolveRowForTableAt
in classJoinedTable
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resolveAllRowsForTableAt
protected void resolveAllRowsForTableAt(IntegerVector row_set, int table_num)
Description copied from class:JoinedTable
Given an IntegerVector that represents a list of pointers to rows in this table, this resolves the rows to row indexes in the given parent table. This method changes the 'row_set' IntegerVector object.- Specified by:
resolveAllRowsForTableAt
in classJoinedTable
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