Package it.unimi.dsi.sux4j.mph

Class TwoStepsMWHCFunction.Builder<T>

java.lang.Object

it.unimi.dsi.sux4j.mph.TwoStepsMWHCFunction.Builder<T>

Enclosing class:

TwoStepsMWHCFunction<T>

public static class TwoStepsMWHCFunction.Builder<T>
extends Object

A builder class for TwoStepsMWHCFunction.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	built	Whether build() has already been called.
protected ChunkedHashStore<T>	chunkedHashStore
protected Iterable<? extends T>	keys
protected File	tempDir
protected TransformationStrategy<? super T>	transform
protected LongBigList	values

Constructor Summary

Constructors

Constructor	Description
Builder()

Method Summary

Modifier and Type	Method	Description
TwoStepsMWHCFunction<T>	build()	Builds a new function.
TwoStepsMWHCFunction.Builder<T>	keys(Iterable<? extends T> keys)	Specifies the keys of the function; if you have specified a it.unimi.dsi.sux4j.io.ChunkedHashStore, it can be null.
TwoStepsMWHCFunction.Builder<T>	store(ChunkedHashStore<T> chunkedHashStore)	Specifies a chunked hash store containing the keys associated with their rank.
TwoStepsMWHCFunction.Builder<T>	tempDir(File tempDir)	Specifies a temporary directory for the it.unimi.dsi.sux4j.io.ChunkedHashStore.
TwoStepsMWHCFunction.Builder<T>	transform(TransformationStrategy<? super T> transform)	Specifies the transformation strategy for the keys of the function.
TwoStepsMWHCFunction.Builder<T>	values(LongBigList values)	Specifies the values assigned to the keys; the output width of the function will be the minimum width needed to represent all values.

Methods inherited from class java.lang.Object

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

Field Details

keys

protected Iterable<? extends T> keys

transform

protected TransformationStrategy<? super T> transform

tempDir

protected File tempDir

chunkedHashStore

protected ChunkedHashStore<T> chunkedHashStore

values

protected LongBigList values

built

protected boolean built

Whether build() has already been called.

Constructor Details

Builder

public Builder()

Method Details

keys

public TwoStepsMWHCFunction.Builder<T> keys(Iterable<? extends T> keys)

Specifies the keys of the function; if you have specified a it.unimi.dsi.sux4j.io.ChunkedHashStore, it can be null.

Parameters:

keys - the keys of the function.

Returns:

this builder.

transform

public TwoStepsMWHCFunction.Builder<T> transform(TransformationStrategy<? super T> transform)

Specifies the transformation strategy for the keys of the function.

Parameters:

transform - a transformation strategy for the keys of the function.

Returns:

this builder.

tempDir

public TwoStepsMWHCFunction.Builder<T> tempDir(File tempDir)

Specifies a temporary directory for the it.unimi.dsi.sux4j.io.ChunkedHashStore.

Parameters:

tempDir - a temporary directory for the it.unimi.dsi.sux4j.io.ChunkedHashStore files, or null for the standard temporary directory.

Returns:

this builder.

store

public TwoStepsMWHCFunction.Builder<T> store(ChunkedHashStore<T> chunkedHashStore)

Specifies a chunked hash store containing the keys associated with their rank.

Warning: during the construction phase, a filter will be set on the specified ChunkedHashStore. You will have to reset it to its previous state.

Parameters:

chunkedHashStore - a chunked hash store containing the keys associated with their rank, or null; the store can be unchecked, but in this case you must specify keys and a transform (otherwise, in case of a hash collision in the store an IllegalStateException will be thrown).

Returns:

this builder.

values

public TwoStepsMWHCFunction.Builder<T> values(LongBigList values)

Specifies the values assigned to the keys; the output width of the function will be the minimum width needed to represent all values.

Parameters:

values - values to be assigned to each element, in the same order of the keys.

Returns:

this builder.

build

public TwoStepsMWHCFunction<T> build()
                              throws IOException

Builds a new function.

Returns:

an MWHCFunction instance with the specified parameters.

Throws:

IllegalStateException - if called more than once.

IOException