Package tech.tablesaw.columns.strings

Class NullDictionaryMap

java.lang.Object

tech.tablesaw.columns.strings.NullDictionaryMap

All Implemented Interfaces:

Iterable<String>, DictionaryMap, StringFilters, StringReduceUtils, FilterSpec<Selection>, StringFilterSpec<Selection>

public class NullDictionaryMap
extends Object
implements DictionaryMap

A null dictionary map has no actual dictionary as the underlying data is not dictionary encoded. It works with textual data that is non-categorical, or where the number of categories approaches 1/2 of the total number of values, making dictionary encoding inefficient.

Constructor Summary

Constructors

Constructor	Description
NullDictionaryMap(DictionaryMap dictionaryMap)

Method Summary

Modifier and Type	Method	Description
void	append(String value)
void	appendMissing()
byte[]	asBytes(int rowNumber)	Returns the contents of the cell at rowNumber as a byte[]
String[]	asObjectArray()
Set<String>	asSet()
boolean	canPromoteToText()
void	clear()
Table	countByCategory(String columnName)
int	countMissing()	Returns the count of missing values in this column
int	countOccurrences(String value)
int	countUnique()
int	firstIndexOf(String string)
String	get(int index)
List<BooleanColumn>	getDummies()
int	getKeyAtIndex(int rowNumber)	Returns the int that represents the string at rowNumber
int	getKeyForIndex(int i)
String	getValueForIndex(int rowIndex)
String	getValueForKey(int key)
Selection	isEqualTo(String string)
Selection	isIn(String... strings)
Selection	isIn(Collection<String> strings)
boolean	isMissing(int rowNumber)
Selection	isNotIn(String... strings)
Selection	isNotIn(Collection<String> strings)
Iterator<String>	iterator()
int	nextKeyWithoutIncrementing()
DictionaryMap	promoteYourself()
Selection	selectIsIn(String... strings)
Selection	selectIsIn(Collection<String> strings)
void	set(int rowIndex, String stringValue)
int	size()
void	sortAscending()
void	sortDescending()

Methods inherited from class java.lang.Object

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

Methods inherited from interface tech.tablesaw.columns.strings.DictionaryMap

asIntArray, isEmpty, isNotEqualTo, uniqueValuesAt

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface tech.tablesaw.columns.strings.StringFilters

containsString, endsWith, equalsIgnoreCase, equalsIgnoreCase, eval, eval, eval, eval, isAlpha, isAlphaNumeric, isEmptyString, isEqualTo, isIn, isLongerThan, isLowerCase, isMissing, isNotEqualTo, isNotIn, isNotMissing, isNumeric, isShorterThan, isUpperCase, lengthEquals, matchesRegex, startsWith, startsWith

Methods inherited from interface tech.tablesaw.columns.strings.StringReduceUtils

appendAll, appendAll

Constructor Detail

NullDictionaryMap

public NullDictionaryMap(DictionaryMap dictionaryMap)

Method Detail

sortDescending

public void sortDescending()

Specified by:

sortDescending in interface DictionaryMap

sortAscending

public void sortAscending()

Specified by:

sortAscending in interface DictionaryMap

getKeyAtIndex

public int getKeyAtIndex(int rowNumber)

Description copied from interface: DictionaryMap

Returns the int that represents the string at rowNumber

Specified by:

getKeyAtIndex in interface DictionaryMap

getValueForKey

public String getValueForKey(int key)

Specified by:

getValueForKey in interface DictionaryMap

size

public int size()

Specified by:

size in interface DictionaryMap

Specified by:

size in interface StringFilters

Specified by:

size in interface StringReduceUtils

getValueForIndex

public String getValueForIndex(int rowIndex)

Specified by:

getValueForIndex in interface DictionaryMap

countOccurrences

public int countOccurrences(String value)

Specified by:

countOccurrences in interface DictionaryMap

asSet

public Set<String> asSet()

Specified by:

asSet in interface DictionaryMap

getKeyForIndex

public int getKeyForIndex(int i)

Specified by:

getKeyForIndex in interface DictionaryMap

firstIndexOf

public int firstIndexOf(String string)

Specified by:

firstIndexOf in interface DictionaryMap

asObjectArray

public String[] asObjectArray()

Specified by:

asObjectArray in interface DictionaryMap

selectIsIn

public Selection selectIsIn(String... strings)

Specified by:

selectIsIn in interface DictionaryMap

selectIsIn

public Selection selectIsIn(Collection<String> strings)

Specified by:

selectIsIn in interface DictionaryMap

append

public void append(String value)
            throws NoKeysAvailableException

Specified by:

append in interface DictionaryMap

Throws:

NoKeysAvailableException

set

public void set(int rowIndex,
                String stringValue)
         throws NoKeysAvailableException

Specified by:

set in interface DictionaryMap

Throws:

NoKeysAvailableException

clear

public void clear()

Specified by:

clear in interface DictionaryMap

countUnique

public int countUnique()

Specified by:

countUnique in interface DictionaryMap

countByCategory

public Table countByCategory(String columnName)

Specified by:

countByCategory in interface DictionaryMap

isEqualTo

public Selection isEqualTo(String string)

Specified by:

isEqualTo in interface DictionaryMap

Specified by:

isEqualTo in interface StringFilters

Specified by:

isEqualTo in interface StringFilterSpec<Selection>

get

public String get(int index)

Specified by:

get in interface DictionaryMap

Specified by:

get in interface StringFilters

isIn

public Selection isIn(String... strings)

Specified by:

isIn in interface DictionaryMap

Specified by:

isIn in interface StringFilters

Specified by:

isIn in interface StringFilterSpec<Selection>

isIn

public Selection isIn(Collection<String> strings)

Specified by:

isIn in interface DictionaryMap

Specified by:

isIn in interface StringFilters

Specified by:

isIn in interface StringFilterSpec<Selection>

isNotIn

public Selection isNotIn(String... strings)

Specified by:

isNotIn in interface DictionaryMap

Specified by:

isNotIn in interface StringFilters

Specified by:

isNotIn in interface StringFilterSpec<Selection>

isNotIn

public Selection isNotIn(Collection<String> strings)

Specified by:

isNotIn in interface DictionaryMap

Specified by:

isNotIn in interface StringFilters

Specified by:

isNotIn in interface StringFilterSpec<Selection>

getDummies

public List<BooleanColumn> getDummies()

Specified by:

getDummies in interface DictionaryMap

asBytes

public byte[] asBytes(int rowNumber)

Description copied from interface: DictionaryMap

Returns the contents of the cell at rowNumber as a byte[]

Specified by:

asBytes in interface DictionaryMap

countMissing

public int countMissing()

Description copied from interface: DictionaryMap

Returns the count of missing values in this column

Specified by:

countMissing in interface DictionaryMap

iterator

public Iterator<String> iterator()

Specified by:

iterator in interface DictionaryMap

Specified by:

iterator in interface Iterable<String>

appendMissing

public void appendMissing()

Specified by:

appendMissing in interface DictionaryMap

isMissing

public boolean isMissing(int rowNumber)

Specified by:

isMissing in interface DictionaryMap

promoteYourself

public DictionaryMap promoteYourself()

Specified by:

promoteYourself in interface DictionaryMap

nextKeyWithoutIncrementing

public int nextKeyWithoutIncrementing()

Specified by:

nextKeyWithoutIncrementing in interface DictionaryMap

canPromoteToText

public boolean canPromoteToText()

Specified by:

canPromoteToText in interface DictionaryMap