org.neo4j.collection.primitive

Class PrimitiveLongIntKeyValueArray

java.lang.Object

org.neo4j.collection.primitive.PrimitiveLongIntKeyValueArray

public class PrimitiveLongIntKeyValueArray
extends Object

This collection class implements a minimal map-like interface for an ordered, primitive-based key-value array. The array both maintains insertion order and ensures key values are unique.

Field Summary

Fields

Modifier and Type	Field and Description
static double	DEFAULT_GROWTH_FACTOR
static int	DEFAULT_INITIAL_CAPACITY

Constructor Summary

Constructors

Constructor and Description
PrimitiveLongIntKeyValueArray()
PrimitiveLongIntKeyValueArray(int initialCapacity)
PrimitiveLongIntKeyValueArray(int initialCapacity, double growthFactor)

Method Summary

Modifier and Type	Method and Description
int	capacity() The current capacity.
void	ensureCapacity(int newCapacity) Ensure the array has at least the capacity requested.
int	getOrDefault(long key, int defaultValue) Fetch the integer mapped to the given key or defaultValue if that key does not exist.
double	growthFactor() The proportion by which this array will automatically grow when full.
long[]	keys() Return an array of all key values, in order of insertion.
boolean	putIfAbsent(long key, int value) Set the value for a given key if that key is not already in use.
void	reset(int newCapacity) Clear the array and set a new capacity if not already large enough.
int	size() The number of items in this array.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_INITIAL_CAPACITY

public static final int DEFAULT_INITIAL_CAPACITY

See Also:

Constant Field Values

DEFAULT_GROWTH_FACTOR

public static final double DEFAULT_GROWTH_FACTOR

See Also:

Constant Field Values

Constructor Detail

PrimitiveLongIntKeyValueArray

public PrimitiveLongIntKeyValueArray(int initialCapacity,
                                     double growthFactor)

PrimitiveLongIntKeyValueArray

public PrimitiveLongIntKeyValueArray(int initialCapacity)

PrimitiveLongIntKeyValueArray

public PrimitiveLongIntKeyValueArray()

Method Detail

capacity

public int capacity()

The current capacity.

Returns:

current capacity

growthFactor

public double growthFactor()

The proportion by which this array will automatically grow when full.

Returns:

the growth factor

ensureCapacity

public void ensureCapacity(int newCapacity)

Ensure the array has at least the capacity requested. The capacity will only ever increase or stay the same.

Parameters:

newCapacity - the new capacity requirement

size

public int size()

The number of items in this array.

Returns:

number of items in the array

getOrDefault

public int getOrDefault(long key,
                        int defaultValue)

Fetch the integer mapped to the given key or defaultValue if that key does not exist.

Parameters:

key - the handle for the required value

defaultValue - value to return if the key is not found

Returns:

the integer value mapped to the key provided

putIfAbsent

public boolean putIfAbsent(long key,
                           int value)

Set the value for a given key if that key is not already in use.

Parameters:

key - the key against which to put the value

value - the value to include

Returns:

true if the value was successfully included, false otherwise

reset

public void reset(int newCapacity)

Clear the array and set a new capacity if not already large enough.

Parameters:

newCapacity - the new capacity requirement

keys

public long[] keys()

Return an array of all key values, in order of insertion.

Returns:

array of key values