Package com.mckoi.database
Class DefaultDataTable
- java.lang.Object
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- com.mckoi.database.Table
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- com.mckoi.database.AbstractDataTable
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- com.mckoi.database.DefaultDataTable
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- All Implemented Interfaces:
RootTable
,TableDataSource
- Direct Known Subclasses:
DataTable
,FunctionTable
,TemporaryTable
public abstract class DefaultDataTable extends AbstractDataTable
This represents a default implementation of a DataTable. It encapsulates information that is core to all DataTable objects. That is,The table name, The description of the table fields, A set of SelectableScheme objects to describe row relations, A counter for the number of rows in the table.
There are two classes that extend this object. DataTable which is a DataTable that is a direct mapping to an internal table stored in the Database files. And TemporaryTable that contains information generated on the fly by the DBMS.
- Author:
- Tobias Downer
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Field Summary
Fields Modifier and Type Field Description protected int
row_count
The number of rows in the table.-
Fields inherited from class com.mckoi.database.Table
DEBUG_QUERY
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
blankSelectableSchemes()
Blanks all the column schemes in the table to an initial state.protected void
blankSelectableSchemes(int type)
Blanks all the column schemes in this table to a specific type of scheme.protected void
clearColumnScheme(int column)
Clears the SelectableScheme information for the given column.int
findFieldName(Variable v)
Given a fully qualified variable field name, ie.int
getColumnCount()
Returns the number of columns in the table.Database
getDatabase()
Returns the Database object this table is part of.Variable
getResolvedVariable(int column)
Returns a fully qualified Variable object that represents the name of the column at the given index.protected SelectableScheme
getRootColumnScheme(int column)
Returns the SelectableScheme for the given column.int
getRowCount()
Returns the number of rows stored in the table.-
Methods inherited from class com.mckoi.database.AbstractDataTable
getTableName, toString, typeEquals
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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, getCellContents, getColumnDefAt, getColumnScheme, getDataTableDef, getFirstCellContent, getFirstCellContent, getLastCellContent, getLastCellContent, getSingleCellContent, getSingleCellContent, getSystem, getTableAccessState, getTTypeForColumn, getTTypeForColumn, hasRootsLocked, join, lockRoot, orderByColumn, orderByColumn, orderByColumn, orderByColumns, orderedRowList, outside, printGraph, rangeSelect, rowEnumeration, selectAll, selectAll, selectFirst, selectLast, selectRange, selectRest, simpleJoin, simpleSelect, singleRowSelect, toMap, union, unlockRoot
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Method Detail
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getDatabase
public Database getDatabase()
Returns the Database object this table is part of.- Specified by:
getDatabase
in classTable
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getRootColumnScheme
protected SelectableScheme getRootColumnScheme(int column)
Returns the SelectableScheme for the given column. This is different from 'getColumnScheme(int column)' because this is designed to be overridden so derived classes can manage their own SelectableScheme sources.
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clearColumnScheme
protected void clearColumnScheme(int column)
Clears the SelectableScheme information for the given column.
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blankSelectableSchemes
protected void blankSelectableSchemes()
Blanks all the column schemes in the table to an initial state. This will make all schemes of type InsertSearch.NOTE: The current default SelectableScheme type is InsertSearch. We may want to make this variable.
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blankSelectableSchemes
protected void blankSelectableSchemes(int type)
Blanks all the column schemes in this table to a specific type of scheme. If Type = 0 then InsertSearch (fast but takes up memory - requires each insert and delete from the table to be logged). If type = 1 then BlindSearch (slower but uses no memory and doesn't require insert and delete to be logged).
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getColumnCount
public int getColumnCount()
Returns the number of columns in the table.- Specified by:
getColumnCount
in classTable
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getRowCount
public int getRowCount()
Returns the number of rows stored in the table.- Specified by:
getRowCount
in interfaceTableDataSource
- Specified by:
getRowCount
in classTable
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getResolvedVariable
public Variable getResolvedVariable(int column)
Returns a fully qualified Variable object that represents the name of the column at the given index. For example, new Variable(new TableName("APP", "CUSTOMER"), "ID")- Specified by:
getResolvedVariable
in classTable
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findFieldName
public int findFieldName(Variable v)
Given a fully qualified variable field name, ie. 'APP.CUSTOMER.CUSTOMERID' this will return the column number the field is at. Returns -1 if the field does not exist in the table.- Specified by:
findFieldName
in classTable
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