proper.engine
Class Propagator

java.lang.Object
  proper.core.ProperObject
      proper.engine.Engine
          proper.engine.DatabaseEngine
              proper.engine.Propagator

All Implemented Interfaces:

ProperInterface

public class Propagator
extends DatabaseEngine

Transforms a tree structure of relations between tables into a star structure with a depth of one, i.e. one central table and then all the others adjacent to it. It uses the class RelationDiscoverer to determine the relations between the tables given a table as starting point. From the generated tree structure it subsequently propagates the keys of the node to its leaves. TODO: adapt to JoinTreeNode

Version:

$Revision: 1.3 $

Author:

FracPete

See Also:

RelationDiscoverer

Field Summary

static java.lang.String

TMPPREFIX prefix for temporary tables

Fields inherited from interface proper.core.ProperInterface

VERSION

Constructor Summary

Propagator()
initializes the object

Method Summary

void	dropTables() drops all temporary tables and also the result table
boolean	execute() executes the flattening of the tables
boolean	getShowRelations() whether the relations between the tables are shown before flattening
TemporaryName	getTemporaryName() returns the temporary name generator
void	setShowRelations(boolean showRelations) whether to display the relations before flattening or not
void	setTemporaryName(TemporaryName tmpName) sets the generator for temporary names

Methods inherited from class proper.engine.Engine

clear, copyParameter, exists, getParameter, getParameters, getStringParameter, setParameter, setParameters, toString, valueEquals

Methods inherited from class proper.core.ProperObject

addListener, addOutput, classInVerbose, debugprint, debugprint, debugprint, debugprint, debugprintln, debugprintln, debugprintln, debugprintln, debugprintln, getListeners, getRuntime, getVerbose, getVerboseLevel, getVerboseLevelForClass, getVerboseString, getVerboseStringForClass, notifyListener, notifyListeners, print, print, print, print, println, println, println, println, println, printMemory, removeListener, setOutput, setVerbose, setVerboseLevel, setVerboseString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

TMPPREFIX

public static final java.lang.String TMPPREFIX

prefix for temporary tables

See Also:

Constant Field Values

Constructor Detail

Propagator

public Propagator()

initializes the object

Method Detail

setTemporaryName

public void setTemporaryName(TemporaryName tmpName)

sets the generator for temporary names

getTemporaryName

public TemporaryName getTemporaryName()

returns the temporary name generator

setShowRelations

public void setShowRelations(boolean showRelations)

whether to display the relations before flattening or not

getShowRelations

public boolean getShowRelations()

whether the relations between the tables are shown before flattening

dropTables

public void dropTables()

drops all temporary tables and also the result table

execute

public boolean execute()

executes the flattening of the tables

Overrides:

execute in class Engine