com.neeve.query.index

Interface IdxIndex<T,ID>

Type Parameters:

T - The type of key for the index.

ID - The value type being indexed.

All Known Subinterfaces:

IdxNonUniqueIndex<K,ID>, IdxUniqueIndex<T,ID>

public interface IdxIndex<T,ID>

Base interface for an index. An index maps a key type to an associated ID or set of IDs depending on its uniqueness.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	IdxIndex.Stats<K> Stats describe the size and composition of an IdxIndex.

Method Summary

Methods

Modifier and Type	Method and Description
Iterable<Map.Entry<T,ID>>	allEntries(boolean ascending) Retrieve all of the indexed values.
Iterable<ID>	allIds(boolean ascending) Retrieve all record ids from the index.
boolean	containsKey(T value) Determine whether the index contains the specified key.
<KEY extends Comparable<KEY>> Iterable<Map.Entry<T,ID>>	getEntries(IdxRange<KEY> range, boolean ascending) Retrieve the indexed values within the specified range.
<REC> IdxField<REC,T>	getField() Retrieve the IdxField on which the index is defined.
<KEY extends Comparable<KEY>> Iterable<ID>	getIds(IdxRange<KEY> range) Gets the an Iterable of the IDs in the given IdxRange
<KEY extends Comparable<KEY>> Iterable<ID>	getIds(IdxRange<KEY> range, Comparator<ID> valueSorter) Gets the an Iterable of the IDs in the given IdxRange
String	getName() Gets the name of the index.
IdxIndex.Stats<T>	getStats() Retrieve the IdxIndex.Stats for this index.
boolean	isUnique() Tests if this is a unique index.
void	put(T value, ID id) Store a key/value pair in the index.
void	remove(T value, ID id) Removes a key/value paid from the index.
int	valueCount(Iterable<? extends Object> values) Gets the number of values for the given key.

Method Detail

getName

String getName()

Gets the name of the index.

put

void put(T value,
       ID id)

Store a key/value pair in the index.

Parameters:

value - The key to be indexed.

id - The value to index.

remove

void remove(T value,
          ID id)

Removes a key/value paid from the index.

Parameters:

value - The key to remove.

id - The value to remove.

containsKey

boolean containsKey(T value)

Determine whether the index contains the specified key.

Parameters:

value - The key to look for.

Returns:

Whether or not the index contains the key.

getStats

IdxIndex.Stats<T> getStats()

Retrieve the IdxIndex.Stats for this index.

Returns:

The IdxIndex.Stats for this index.

getField

<REC> IdxField<REC,T> getField()

Retrieve the IdxField on which the index is defined.

Returns:

The field that this IdxIndex indexes.

isUnique

boolean isUnique()

Tests if this is a unique index.

Returns:

true If this is a unique index

allIds

Iterable<ID> allIds(boolean ascending)

Retrieve all record ids from the index.

Parameters:

ascending - Indicates whether the index is read in ascending key order or descending key order.

Returns:

An iterable of all of the ids.

getIds

<KEY extends Comparable<KEY>> Iterable<ID> getIds(IdxRange<KEY> range)

Gets the an Iterable of the IDs in the given IdxRange

Parameters:

range - The range whose IDs should be retrieved.

Returns:

An Iterable of the IDs in the given IdxRange

getIds

<KEY extends Comparable<KEY>> Iterable<ID> getIds(IdxRange<KEY> range,
                                                Comparator<ID> valueSorter)

Gets the an Iterable of the IDs in the given IdxRange

Parameters:

range - The range whose IDs should be retrieved.

valueSorter - If specified the comparator will be used to order the resulting values.

Returns:

An Iterable of the IDs in the given IdxRange

allEntries

Iterable<Map.Entry<T,ID>> allEntries(boolean ascending)

Retrieve all of the indexed values.

Returns:

The indexed values.

getEntries

<KEY extends Comparable<KEY>> Iterable<Map.Entry<T,ID>> getEntries(IdxRange<KEY> range,
                                                                 boolean ascending)

Retrieve the indexed values within the specified range.

Parameters:

range - The range of indexed values

Returns:

The specific indexed values within that range.

valueCount

int valueCount(Iterable<? extends Object> values)

Gets the number of values for the given key.

Parameters:

values - The list of keys for which to count values

Returns:

The number of values associated with the list of keys.