org.verdictdb.core.scrambling

Class UniformScramblingMethod

java.lang.Object

org.verdictdb.core.scrambling.ScramblingMethodBase

org.verdictdb.core.scrambling.UniformScramblingMethod

All Implemented Interfaces:

ScramblingMethod

public class UniformScramblingMethod
extends ScramblingMethodBase

Field Summary

Fields inherited from class org.verdictdb.core.scrambling.ScramblingMethodBase

blockSize

Constructor Summary

Constructors

Constructor and Description
UniformScramblingMethod(long blockSize)

Method Summary

Modifier and Type	Method and Description
int	getBlockCount()
List<Double>	getCumulativeProbabilityDistributionForTier(Map<String,Object> metaData, int tier)
String	getMainTableAlias()
AbstractRelation	getScramblingSource(String originalSchema, String originalTable, Map<String,Object> metaData) Returns the table that should be used in the final scrambling stage.
List<ExecutableNodeBase>	getStatisticsNode(String oldSchemaName, String oldTableName, String columnMetaTokenKey, String partitionMetaTokenKey)
int	getTierCount()
List<UnnamedColumn>	getTierExpressions(Map<String,Object> metaData)

Methods inherited from class org.verdictdb.core.scrambling.ScramblingMethodBase

getStoredCumulativeProbabilityDistributionForTier, storeCumulativeProbabilityDistribution

Methods inherited from class java.lang.Object

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

Constructor Detail

UniformScramblingMethod

public UniformScramblingMethod(long blockSize)

Method Detail

getStatisticsNode

public List<ExecutableNodeBase> getStatisticsNode(String oldSchemaName,
                                                  String oldTableName,
                                                  String columnMetaTokenKey,
                                                  String partitionMetaTokenKey)

getTierExpressions

public List<UnnamedColumn> getTierExpressions(Map<String,Object> metaData)

Returns:

A list of sql expressions (boolean predicates) that must be evaluated true at the step indicating a particular tier

getCumulativeProbabilityDistributionForTier

public List<Double> getCumulativeProbabilityDistributionForTier(Map<String,Object> metaData,
                                                                int tier)

tier - 0, 1, ..., getTierCount()-1

Returns:

A list of doubles. The values should be increasing; the last value must be 1.0; and the size of the list must be equal to "length".

getScramblingSource

public AbstractRelation getScramblingSource(String originalSchema,
                                            String originalTable,
                                            Map<String,Object> metaData)

Description copied from interface: ScramblingMethod

Returns the table that should be used in the final scrambling stage. This can be a join of the main table and some auxiliary tables.

Returns:

getMainTableAlias

public String getMainTableAlias()

getBlockCount

public int getBlockCount()

getTierCount

public int getTierCount()