org.eigenbase.relopt
Class TableAccessMap

java.lang.Object
  org.eigenbase.relopt.TableAccessMap

public class TableAccessMap
extends Object

TableAccessMap represents the tables accessed by a query plan, with READ/WRITE information.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/relopt/TableAccessMap.java#16 $

Author:

John V. Sichi

Nested Class Summary

static class	TableAccessMap.Mode
private class	TableAccessMap.TableRelVisitor

Field Summary

private Map<List<String>,TableAccessMap.Mode>

accessMap

Constructor Summary

TableAccessMap()
Constructs a permanently empty TableAccessMap.

TableAccessMap(List<String> table, TableAccessMap.Mode mode)
Constructs a TableAccessMap for a single table

TableAccessMap(RelNode rel)
Constructs a TableAccessMap for all tables accessed by a RelNode and its descendants.

Method Summary

List<String>	getQualifiedName(RelOptTable table) Constructs a qualified name for an optimizer table reference.
TableAccessMap.Mode	getTableAccessMode(List<String> tableName) Determines the access mode of a table.
Set<List<String>>	getTablesAccessed()
boolean	isTableAccessed(List<String> tableName) Determines whether a table is accessed at all.
boolean	isTableAccessedForRead(List<String> tableName) Determines whether a table is accessed for read.
boolean	isTableAccessedForWrite(List<String> tableName) Determines whether a table is accessed for write.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

accessMap

private final Map<List<String>,TableAccessMap.Mode> accessMap

Constructor Detail

TableAccessMap

public TableAccessMap()

Constructs a permanently empty TableAccessMap.

TableAccessMap

public TableAccessMap(RelNode rel)

Constructs a TableAccessMap for all tables accessed by a RelNode and its descendants.

Parameters:

rel - the RelNode for which to build the map

TableAccessMap

public TableAccessMap(List<String> table,
                      TableAccessMap.Mode mode)

Constructs a TableAccessMap for a single table

Parameters:

table - fully qualified name of the table, represented as a list

mode - access mode for the table

Method Detail

getTablesAccessed

public Set<List<String>> getTablesAccessed()

Returns:

set of qualified names for all tables accessed

isTableAccessed

public boolean isTableAccessed(List<String> tableName)

Determines whether a table is accessed at all.

Parameters:

tableName - qualified name of the table of interest

Returns:

true if table is accessed

isTableAccessedForRead

public boolean isTableAccessedForRead(List<String> tableName)

Determines whether a table is accessed for read.

Parameters:

tableName - qualified name of the table of interest

Returns:

true if table is accessed for read

isTableAccessedForWrite

public boolean isTableAccessedForWrite(List<String> tableName)

Determines whether a table is accessed for write.

Parameters:

tableName - qualified name of the table of interest

Returns:

true if table is accessed for write

getTableAccessMode

public TableAccessMap.Mode getTableAccessMode(List<String> tableName)

Determines the access mode of a table.

Parameters:

tableName - qualified name of the table of interest

Returns:

access mode

getQualifiedName

public List<String> getQualifiedName(RelOptTable table)

Constructs a qualified name for an optimizer table reference.

Parameters:

table - table of interest

Returns:

qualified name