org.apache.jena.atlas.lib

Class ColumnMap

java.lang.Object

org.apache.jena.atlas.lib.ColumnMap

public class ColumnMap
extends Object

General descriptor of a reordering (mapping) of columns in tuples to columns in indexes, for example, from triples to triple index order. Naming: map is convert to the reordered form, fetch is get back.

Constructor Summary

Constructors

Constructor and Description
ColumnMap(String label, int... elements) Construct a column map - the elements are the mappings of a tuple originally in the order 0,1,2,...
ColumnMap(String label, List<T> input, List<T> output)
ColumnMap(String input, String output) Construct a column mapping that maps the input (one col, one char) to the output
ColumnMap(String label, T[] input, T[] output)

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	fetchSlot(int idx, T[] tuple) Apply to an unmapped tuple to get the i'th slot after mapping : SPO->POS : 0'th slot is P from SPO
<T> T	fetchSlot(int idx, Tuple<T> tuple) Apply to an unmapped tuple to get the i'th slot after mapping : SPO->POS : 0'th slot is P from SPO
int	fetchSlotIdx(int idx) Get the index of the i'th slot as it appears from a mapping : for SPO->POS : 0'th slot is P so 1->0
String	getLabel()
int	length() Length of mapping
<T> Tuple<T>	map(Tuple<T> src) Apply to an unmapped tuple to get a tuple with the column mapping applied
String	mapName(String word) Reorder the letters of a string by the same rules as this column map (forward, map direction)
<T> T	mapSlot(int idx, T[] tuple) Apply to a mapped tuple to get the i'th slot as it appears after mapping : SPO->POS : 0'th slot is S from POS
<T> T	mapSlot(int idx, Tuple<T> tuple) Apply to a mapped tuple to get the i'th slot as it appears after mapping : SPO->POS : 0'th slot is S from POS
int	mapSlotIdx(int idx) Get the index of the i'th slot as it appears after mapping : SPO->POS : 0'th slot is S from POS so 2->0
String	toString()
<T> Tuple<T>	unmap(Tuple<T> src) Apply to a mapped tuple to get a tuple with the column mapping reverse-applied
String	unmapName(String word) Reorder the letters of a string by the same rules as this column map (backward, fetch direction)

Methods inherited from class java.lang.Object

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

Constructor Detail

ColumnMap

public ColumnMap(String input,
         String output)

Construct a column mapping that maps the input (one col, one char) to the output

ColumnMap

public ColumnMap(String label,
         List<T> input,
         List<T> output)

ColumnMap

public ColumnMap(String label,
         T[] input,
         T[] output)

ColumnMap

public ColumnMap(String label,
         int... elements)

Construct a column map - the elements are the mappings of a tuple originally in the order 0,1,2,... so SPO->POS is 2,0,1 (SPO->POS so S->2, P->0, O->1) and not 1,2,0 (which is the extraction mapping). The label is just a lable and is not interpretted.

Method Detail

length

public int length()

Length of mapping

fetchSlot

public <T> T fetchSlot(int idx,
              Tuple<T> tuple)

Apply to an unmapped tuple to get the i'th slot after mapping : SPO->POS : 0'th slot is P from SPO

fetchSlot

public <T> T fetchSlot(int idx,
              T[] tuple)

Apply to an unmapped tuple to get the i'th slot after mapping : SPO->POS : 0'th slot is P from SPO

mapSlot

public <T> T mapSlot(int idx,
            Tuple<T> tuple)

Apply to a mapped tuple to get the i'th slot as it appears after mapping : SPO->POS : 0'th slot is S from POS

mapSlot

public <T> T mapSlot(int idx,
            T[] tuple)

Apply to a mapped tuple to get the i'th slot as it appears after mapping : SPO->POS : 0'th slot is S from POS

mapSlotIdx

public int mapSlotIdx(int idx)

Get the index of the i'th slot as it appears after mapping : SPO->POS : 0'th slot is S from POS so 2->0

fetchSlotIdx

public int fetchSlotIdx(int idx)

Get the index of the i'th slot as it appears from a mapping : for SPO->POS : 0'th slot is P so 1->0

map

public <T> Tuple<T> map(Tuple<T> src)

Apply to an unmapped tuple to get a tuple with the column mapping applied

unmap

public <T> Tuple<T> unmap(Tuple<T> src)

Apply to a mapped tuple to get a tuple with the column mapping reverse-applied

toString

public String toString()

Overrides:

toString in class Object

getLabel

public String getLabel()

mapName

public String mapName(String word)

Reorder the letters of a string by the same rules as this column map (forward, map direction)

unmapName

public String unmapName(String word)

Reorder the letters of a string by the same rules as this column map (backward, fetch direction)