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package com.carrotsearch.hppc;
import java.util.*;
import com.carrotsearch.hppc.cursors.*;
import com.carrotsearch.hppc.predicates.*;
import com.carrotsearch.hppc.procedures.*;
import static com.carrotsearch.hppc.HashContainers.*;
import static com.carrotsearch.hppc.Containers.*;
/**
* A hash map of int to byte, implemented using open
* addressing with linear probing for collision resolution.
*
* Note: read about important differences
* between hash and scatter sets.
*
* @see IntByteScatterMap
* @see HPPC interfaces diagram
*/
@com.carrotsearch.hppc.Generated(
date = "2018-05-21T12:24:06+0200",
value = "KTypeVTypeHashMap.java")
public class IntByteHashMap
implements
IntByteMap,
Preallocable,
Cloneable
{
/**
* The array holding keys.
*/
public int []
keys;
/**
* The array holding values.
*/
public byte []
values;
/**
* We perturb hash values with a container-unique
* seed to avoid problems with nearly-sorted-by-hash
* values on iterations.
*
* @see #hashKey
* @see "http://issues.carrot2.org/browse/HPPC-80"
* @see "http://issues.carrot2.org/browse/HPPC-103"
*/
protected int keyMixer;
/**
* The number of stored keys (assigned key slots), excluding the special
* "empty" key, if any (use {@link #size()} instead).
*
* @see #size()
*/
protected int assigned;
/**
* Mask for slot scans in {@link #keys}.
*/
protected int mask;
/**
* Expand (rehash) {@link #keys} when {@link #assigned} hits this value.
*/
protected int resizeAt;
/**
* Special treatment for the "empty slot" key marker.
*/
protected boolean hasEmptyKey;
/**
* The load factor for {@link #keys}.
*/
protected double loadFactor;
/**
* Per-instance hash order mixing strategy.
* @see #keyMixer
*/
protected HashOrderMixingStrategy orderMixer;
/**
* New instance with sane defaults.
*/
public IntByteHashMap() {
this(DEFAULT_EXPECTED_ELEMENTS);
}
/**
* New instance with sane defaults.
*
* @param expectedElements
* The expected number of elements guaranteed not to cause buffer
* expansion (inclusive).
*/
public IntByteHashMap(int expectedElements) {
this(expectedElements, DEFAULT_LOAD_FACTOR);
}
/**
* New instance with sane defaults.
*
* @param expectedElements
* The expected number of elements guaranteed not to cause buffer
* expansion (inclusive).
* @param loadFactor
* The load factor for internal buffers. Insane load factors (zero, full capacity)
* are rejected by {@link #verifyLoadFactor(double)}.
*/
public IntByteHashMap(int expectedElements, double loadFactor) {
this(expectedElements, loadFactor, HashOrderMixing.defaultStrategy());
}
/**
* New instance with the provided defaults.
*
* @param expectedElements
* The expected number of elements guaranteed not to cause a rehash (inclusive).
* @param loadFactor
* The load factor for internal buffers. Insane load factors (zero, full capacity)
* are rejected by {@link #verifyLoadFactor(double)}.
* @param orderMixer
* Hash key order mixing strategy. See {@link HashOrderMixing} for predefined
* implementations. Use constant mixers only if you understand the potential
* consequences.
*/
public IntByteHashMap(int expectedElements, double loadFactor, HashOrderMixingStrategy orderMixer) {
this.orderMixer = orderMixer;
this.loadFactor = verifyLoadFactor(loadFactor);
ensureCapacity(expectedElements);
}
/**
* Create a hash map from all key-value pairs of another container.
*/
public IntByteHashMap(IntByteAssociativeContainer container) {
this(container.size());
putAll(container);
}
/**
* {@inheritDoc}
*/
@Override
public byte put(int key, byte value) {
assert assigned < mask + 1;
final int mask = this.mask;
if (((key) == 0)) {
hasEmptyKey = true;
byte previousValue = values[mask + 1];
values[mask + 1] = value;
return previousValue;
} else {
final int[] keys = this.keys;
int slot = hashKey(key) & mask;
int existing;
while (!((existing = keys[slot]) == 0)) {
if (((existing) == ( key))) {
final byte previousValue = values[slot];
values[slot] = value;
return previousValue;
}
slot = (slot + 1) & mask;
}
if (assigned == resizeAt) {
allocateThenInsertThenRehash(slot, key, value);
} else {
keys[slot] = key;
values[slot] = value;
}
assigned++;
return ((byte) 0);
}
}
/**
* {@inheritDoc}
*/
@Override
public int putAll(IntByteAssociativeContainer container) {
final int count = size();
for (IntByteCursor c : container) {
put(c.key, c.value);
}
return size() - count;
}
/**
* Puts all key/value pairs from a given iterable into this map.
*/
@Override
public int putAll(Iterable iterable){
final int count = size();
for (IntByteCursor c : iterable) {
put(c.key, c.value);
}
return size() - count;
}
/**
* Trove-inspired API method. An equivalent
* of the following code:
*
* if (!map.containsKey(key)) map.put(value);
*
*
* @param key The key of the value to check.
* @param value The value to put if key does not exist.
* @return true if key did not exist and value
* was placed in the map.
*/
public boolean putIfAbsent(int key, byte value) {
int keyIndex = indexOf(key);
if (!indexExists(keyIndex)) {
indexInsert(keyIndex, key, value);
return true;
} else {
return false;
}
}
/**
* If key exists, putValue is inserted into the map,
* otherwise any existing value is incremented by additionValue.
*
* @param key
* The key of the value to adjust.
* @param putValue
* The value to put if key does not exist.
* @param incrementValue
* The value to add to the existing value if key exists.
* @return Returns the current value associated with key (after
* changes).
*/
@Override
public byte putOrAdd(int key, byte putValue, byte incrementValue) {
assert assigned < mask + 1;
int keyIndex = indexOf(key);
if (indexExists(keyIndex)) {
putValue = ((byte) (( values[keyIndex]) + (incrementValue)));
indexReplace(keyIndex, putValue);
} else {
indexInsert(keyIndex, key, putValue);
}
return putValue;
}
/**
* Adds incrementValue to any existing value for the given key
* or inserts incrementValue if key did not previously exist.
*
* @param key The key of the value to adjust.
* @param incrementValue The value to put or add to the existing value if key exists.
* @return Returns the current value associated with key (after changes).
*/
@Override
public byte addTo(int key, byte incrementValue)
{
return putOrAdd(key, incrementValue, incrementValue);
}
/**
* {@inheritDoc}
*/
@Override
public byte remove(int key) {
final int mask = this.mask;
if (((key) == 0)) {
hasEmptyKey = false;
byte previousValue = values[mask + 1];
values[mask + 1] = ((byte) 0);
return previousValue;
} else {
final int[] keys = this.keys;
int slot = hashKey(key) & mask;
int existing;
while (!((existing = keys[slot]) == 0)) {
if (((existing) == ( key))) {
final byte previousValue = values[slot];
shiftConflictingKeys(slot);
return previousValue;
}
slot = (slot + 1) & mask;
}
return ((byte) 0);
}
}
/**
* {@inheritDoc}
*/
@Override
public int removeAll(IntContainer other) {
final int before = size();
// Try to iterate over the smaller set of values or
// over the container that isn't implementing
// efficient contains() lookup.
if (other.size() >= size() &&
other instanceof IntLookupContainer) {
if (hasEmptyKey) {
if (other.contains(0)) {
hasEmptyKey = false;
values[mask + 1] = ((byte) 0);
}
}
final int[] keys = this.keys;
for (int slot = 0, max = this.mask; slot <= max;) {
int existing;
if (!((existing = keys[slot]) == 0) && other.contains(existing)) {
// Shift, do not increment slot.
shiftConflictingKeys(slot);
} else {
slot++;
}
}
} else {
for (IntCursor c : other) {
this.remove( c.value);
}
}
return before - size();
}
/**
* {@inheritDoc}
*/
@Override
public int removeAll(IntBytePredicate predicate) {
final int before = size();
final int mask = this.mask;
if (hasEmptyKey) {
if (predicate.apply(0, values[mask + 1])) {
hasEmptyKey = false;
values[mask + 1] = ((byte) 0);
}
}
final int[] keys = this.keys;
final byte[] values = this.values;
for (int slot = 0; slot <= mask;) {
int existing;
if (!((existing = keys[slot]) == 0) &&
predicate.apply(existing, values[slot])) {
// Shift, do not increment slot.
shiftConflictingKeys(slot);
} else {
slot++;
}
}
return before - size();
}
/**
* {@inheritDoc}
*/
@Override
public int removeAll(IntPredicate predicate) {
final int before = size();
if (hasEmptyKey) {
if (predicate.apply(0)) {
hasEmptyKey = false;
values[mask + 1] = ((byte) 0);
}
}
final int[] keys = this.keys;
for (int slot = 0, max = this.mask; slot <= max;) {
int existing;
if (!((existing = keys[slot]) == 0) &&
predicate.apply(existing)) {
// Shift, do not increment slot.
shiftConflictingKeys(slot);
} else {
slot++;
}
}
return before - size();
}
/**
* {@inheritDoc}
*/
@Override
public byte get(int key) {
if (((key) == 0)) {
return hasEmptyKey ? values[mask + 1] : ((byte) 0);
} else {
final int[] keys = this.keys;
final int mask = this.mask;
int slot = hashKey(key) & mask;
int existing;
while (!((existing = keys[slot]) == 0)) {
if (((existing) == ( key))) {
return values[slot];
}
slot = (slot + 1) & mask;
}
return ((byte) 0);
}
}
/**
* {@inheritDoc}
*/
@Override
public byte getOrDefault(int key, byte defaultValue) {
if (((key) == 0)) {
return hasEmptyKey ? values[mask + 1] : defaultValue;
} else {
final int[] keys = this.keys;
final int mask = this.mask;
int slot = hashKey(key) & mask;
int existing;
while (!((existing = keys[slot]) == 0)) {
if (((existing) == ( key))) {
return values[slot];
}
slot = (slot + 1) & mask;
}
return defaultValue;
}
}
/**
* {@inheritDoc}
*/
@Override
public boolean containsKey(int key) {
if (((key) == 0)) {
return hasEmptyKey;
} else {
final int[] keys = this.keys;
final int mask = this.mask;
int slot = hashKey(key) & mask;
int existing;
while (!((existing = keys[slot]) == 0)) {
if (((existing) == ( key))) {
return true;
}
slot = (slot + 1) & mask;
}
return false;
}
}
/**
* {@inheritDoc}
*/
@Override
public int indexOf(int key) {
final int mask = this.mask;
if (((key) == 0)) {
return hasEmptyKey ? mask + 1 : ~(mask + 1);
} else {
final int[] keys = this.keys;
int slot = hashKey(key) & mask;
int existing;
while (!((existing = keys[slot]) == 0)) {
if (((existing) == ( key))) {
return slot;
}
slot = (slot + 1) & mask;
}
return ~slot;
}
}
/**
* {@inheritDoc}
*/
@Override
public boolean indexExists(int index) {
assert index < 0 ||
(index >= 0 && index <= mask) ||
(index == mask + 1 && hasEmptyKey);
return index >= 0;
}
/**
* {@inheritDoc}
*/
@Override
public byte indexGet(int index) {
assert index >= 0 : "The index must point at an existing key.";
assert index <= mask ||
(index == mask + 1 && hasEmptyKey);
return values[index];
}
/**
* {@inheritDoc}
*/
@Override
public byte indexReplace(int index, byte newValue) {
assert index >= 0 : "The index must point at an existing key.";
assert index <= mask ||
(index == mask + 1 && hasEmptyKey);
byte previousValue = values[index];
values[index] = newValue;
return previousValue;
}
/**
* {@inheritDoc}
*/
@Override
public void indexInsert(int index, int key, byte value) {
assert index < 0 : "The index must not point at an existing key.";
index = ~index;
if (((key) == 0)) {
assert index == mask + 1;
values[index] = value;
hasEmptyKey = true;
} else {
assert ((keys[index]) == 0);
if (assigned == resizeAt) {
allocateThenInsertThenRehash(index, key, value);
} else {
keys[index] = key;
values[index] = value;
}
assigned++;
}
}
/**
* {@inheritDoc}
*/
@Override
public void clear() {
assigned = 0;
hasEmptyKey = false;
Arrays.fill(keys, 0);
/* */
}
/**
* {@inheritDoc}
*/
@Override
public void release() {
assigned = 0;
hasEmptyKey = false;
keys = null;
values = null;
ensureCapacity(Containers.DEFAULT_EXPECTED_ELEMENTS);
}
/**
* {@inheritDoc}
*/
@Override
public int size() {
return assigned + (hasEmptyKey ? 1 : 0);
}
/**
* {@inheritDoc}
*/
public boolean isEmpty() {
return size() == 0;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
int h = hasEmptyKey ? 0xDEADBEEF : 0;
for (IntByteCursor c : this) {
h += BitMixer.mix(c.key) +
BitMixer.mix(c.value);
}
return h;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
return obj != null &&
getClass() == obj.getClass() &&
equalElements(getClass().cast(obj));
}
/**
* Return true if all keys of some other container exist in this container.
*/
protected boolean equalElements(IntByteHashMap other) {
if (other.size() != size()) {
return false;
}
for (IntByteCursor c : other) {
int key = c.key;
if (!containsKey(key) ||
!((get(key)) == (c.value))) {
return false;
}
}
return true;
}
/**
* Ensure this container can hold at least the
* given number of keys (entries) without resizing its buffers.
*
* @param expectedElements The total number of keys, inclusive.
*/
@Override
public void ensureCapacity(int expectedElements) {
if (expectedElements > resizeAt || keys == null) {
final int[] prevKeys = this.keys;
final byte[] prevValues = this.values;
allocateBuffers(minBufferSize(expectedElements, loadFactor));
if (prevKeys != null && !isEmpty()) {
rehash(prevKeys, prevValues);
}
}
}
/**
* An iterator implementation for {@link #iterator}.
*/
private final class EntryIterator extends AbstractIterator {
private final IntByteCursor cursor;
private final int max = mask + 1;
private int slot = -1;
public EntryIterator() {
cursor = new IntByteCursor();
}
@Override
protected IntByteCursor fetch() {
if (slot < max) {
int existing;
for (slot++; slot < max; slot++) {
if (!((existing = keys[slot]) == 0)) {
cursor.index = slot;
cursor.key = existing;
cursor.value = values[slot];
return cursor;
}
}
}
if (slot == max && hasEmptyKey) {
cursor.index = slot;
cursor.key = 0;
cursor.value = values[max];
slot++;
return cursor;
}
return done();
}
}
/**
* {@inheritDoc}
*/
@Override
public Iterator iterator() {
return new EntryIterator();
}
/**
* {@inheritDoc}
*/
@Override
public T forEach(T procedure) {
final int[] keys = this.keys;
final byte[] values = this.values;
if (hasEmptyKey) {
procedure.apply(0, values[mask + 1]);
}
for (int slot = 0, max = this.mask; slot <= max; slot++) {
if (!((keys[slot]) == 0)) {
procedure.apply(keys[slot], values[slot]);
}
}
return procedure;
}
/**
* {@inheritDoc}
*/
@Override
public T forEach(T predicate) {
final int[] keys = this.keys;
final byte[] values = this.values;
if (hasEmptyKey) {
if (!predicate.apply(0, values[mask + 1])) {
return predicate;
}
}
for (int slot = 0, max = this.mask; slot <= max; slot++) {
if (!((keys[slot]) == 0)) {
if (!predicate.apply(keys[slot], values[slot])) {
break;
}
}
}
return predicate;
}
/**
* Returns a specialized view of the keys of this associated container. The
* view additionally implements {@link ObjectLookupContainer}.
*/
public KeysContainer keys() {
return new KeysContainer();
}
/**
* A view of the keys inside this hash map.
*/
public final class KeysContainer extends AbstractIntCollection
implements IntLookupContainer {
private final IntByteHashMap owner = IntByteHashMap.this;
@Override
public boolean contains(int e) {
return owner.containsKey(e);
}
@Override
public T forEach(final T procedure) {
owner.forEach(new IntByteProcedure() {
@Override
public void apply(int key, byte value) {
procedure.apply(key);
}
});
return procedure;
}
@Override
public T forEach(final T predicate) {
owner.forEach(new IntBytePredicate() {
@Override
public boolean apply(int key, byte value) {
return predicate.apply(key);
}
});
return predicate;
}
@Override
public boolean isEmpty() {
return owner.isEmpty();
}
@Override
public Iterator iterator() {
return new KeysIterator();
}
@Override
public int size() {
return owner.size();
}
@Override
public void clear() {
owner.clear();
}
@Override
public void release() {
owner.release();
}
@Override
public int removeAll(IntPredicate predicate) {
return owner.removeAll(predicate);
}
@Override
public int removeAll(final int e) {
final boolean hasKey = owner.containsKey(e);
if (hasKey) {
owner.remove(e);
return 1;
} else {
return 0;
}
}
};
/**
* An iterator over the set of assigned keys.
*/
private final class KeysIterator extends AbstractIterator {
private final IntCursor cursor;
private final int max = mask + 1;
private int slot = -1;
public KeysIterator() {
cursor = new IntCursor();
}
@Override
protected IntCursor fetch() {
if (slot < max) {
int existing;
for (slot++; slot < max; slot++) {
if (!((existing = keys[slot]) == 0)) {
cursor.index = slot;
cursor.value = existing;
return cursor;
}
}
}
if (slot == max && hasEmptyKey) {
cursor.index = slot;
cursor.value = 0;
slot++;
return cursor;
}
return done();
}
}
/**
* @return Returns a container with all values stored in this map.
*/
@Override
public ByteCollection values() {
return new ValuesContainer();
}
/**
* A view over the set of values of this map.
*/
private final class ValuesContainer extends AbstractByteCollection {
private final IntByteHashMap owner = IntByteHashMap.this;
@Override
public int size() {
return owner.size();
}
@Override
public boolean isEmpty() {
return owner.isEmpty();
}
@Override
public boolean contains(byte value) {
for (IntByteCursor c : owner) {
if (((c.value) == (value))) {
return true;
}
}
return false;
}
@Override
public T forEach(T procedure) {
for (IntByteCursor c : owner) {
procedure.apply(c.value);
}
return procedure;
}
@Override
public T forEach(T predicate) {
for (IntByteCursor c : owner) {
if (!predicate.apply(c.value)) {
break;
}
}
return predicate;
}
@Override
public Iterator iterator() {
return new ValuesIterator();
}
@Override
public int removeAll(final byte e) {
return owner.removeAll(new IntBytePredicate() {
@Override
public boolean apply(int key, byte value) {
return ((value) == (e));
}
});
}
@Override
public int removeAll(final BytePredicate predicate) {
return owner.removeAll(new IntBytePredicate() {
@Override
public boolean apply(int key, byte value) {
return predicate.apply(value);
}
});
}
@Override
public void clear() {
owner.clear();
}
@Override
public void release() {
owner.release();
}
}
/**
* An iterator over the set of assigned values.
*/
private final class ValuesIterator extends AbstractIterator {
private final ByteCursor cursor;
private final int max = mask + 1;
private int slot = -1;
public ValuesIterator() {
cursor = new ByteCursor();
}
@Override
protected ByteCursor fetch() {
if (slot < max) {
for (slot++; slot < max; slot++) {
if (!(( keys[slot]) == 0)) {
cursor.index = slot;
cursor.value = values[slot];
return cursor;
}
}
}
if (slot == max && hasEmptyKey) {
cursor.index = slot;
cursor.value = values[max];
slot++;
return cursor;
}
return done();
}
}
/**
* {@inheritDoc}
*/
@Override
public IntByteHashMap clone() {
try {
/* */
IntByteHashMap cloned = (IntByteHashMap) super.clone();
cloned.keys = keys.clone();
cloned.values = values.clone();
cloned.hasEmptyKey = cloned.hasEmptyKey;
cloned.orderMixer = orderMixer.clone();
return cloned;
} catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
/**
* Convert the contents of this map to a human-friendly string.
*/
@Override
public String toString() {
final StringBuilder buffer = new StringBuilder();
buffer.append("[");
boolean first = true;
for (IntByteCursor cursor : this) {
if (!first) {
buffer.append(", ");
}
buffer.append(cursor.key);
buffer.append("=>");
buffer.append(cursor.value);
first = false;
}
buffer.append("]");
return buffer.toString();
}
@Override
public String visualizeKeyDistribution(int characters) {
return IntBufferVisualizer.visualizeKeyDistribution(keys, mask, characters);
}
/**
* Creates a hash map from two index-aligned arrays of key-value pairs.
*/
public static IntByteHashMap from(int[] keys, byte[] values) {
if (keys.length != values.length) {
throw new IllegalArgumentException("Arrays of keys and values must have an identical length.");
}
IntByteHashMap map = new IntByteHashMap(keys.length);
for (int i = 0; i < keys.length; i++) {
map.put(keys[i], values[i]);
}
return map;
}
/**
* Returns a hash code for the given key.
*
* The default implementation mixes the hash of the key with {@link #keyMixer}
* to differentiate hash order of keys between hash containers. Helps
* alleviate problems resulting from linear conflict resolution in open
* addressing.
*
* The output from this function should evenly distribute keys across the
* entire integer range.
*/
protected
int hashKey(int key) {
assert !((key) == 0); // Handled as a special case (empty slot marker).
return BitMixer.mix(key, this.keyMixer);
}
/**
* Validate load factor range and return it. Override and suppress if you need
* insane load factors.
*/
protected double verifyLoadFactor(double loadFactor) {
checkLoadFactor(loadFactor, MIN_LOAD_FACTOR, MAX_LOAD_FACTOR);
return loadFactor;
}
/**
* Rehash from old buffers to new buffers.
*/
protected void rehash(int[] fromKeys, byte[] fromValues) {
assert fromKeys.length == fromValues.length &&
HashContainers.checkPowerOfTwo(fromKeys.length - 1);
// Rehash all stored key/value pairs into the new buffers.
final int[] keys = this.keys;
final byte[] values = this.values;
final int mask = this.mask;
int existing;
// Copy the zero element's slot, then rehash everything else.
int from = fromKeys.length - 1;
keys[keys.length - 1] = fromKeys[from];
values[values.length - 1] = fromValues[from];
while (--from >= 0) {
if (!((existing = fromKeys[from]) == 0)) {
int slot = hashKey(existing) & mask;
while (!((keys[slot]) == 0)) {
slot = (slot + 1) & mask;
}
keys[slot] = existing;
values[slot] = fromValues[from];
}
}
}
/**
* Allocate new internal buffers. This method attempts to allocate
* and assign internal buffers atomically (either allocations succeed or not).
*/
protected void allocateBuffers(int arraySize) {
assert Integer.bitCount(arraySize) == 1;
// Compute new hash mixer candidate before expanding.
final int newKeyMixer = this.orderMixer.newKeyMixer(arraySize);
// Ensure no change is done if we hit an OOM.
int[] prevKeys = this.keys;
byte[] prevValues = this.values;
try {
int emptyElementSlot = 1;
this.keys = (new int [arraySize + emptyElementSlot]);
this.values = (new byte [arraySize + emptyElementSlot]);
} catch (OutOfMemoryError e) {
this.keys = prevKeys;
this.values = prevValues;
throw new BufferAllocationException(
"Not enough memory to allocate buffers for rehashing: %,d -> %,d",
e,
this.mask + 1,
arraySize);
}
this.resizeAt = expandAtCount(arraySize, loadFactor);
this.keyMixer = newKeyMixer;
this.mask = arraySize - 1;
}
/**
* This method is invoked when there is a new key/ value pair to be inserted into
* the buffers but there is not enough empty slots to do so.
*
* New buffers are allocated. If this succeeds, we know we can proceed
* with rehashing so we assign the pending element to the previous buffer
* (possibly violating the invariant of having at least one empty slot)
* and rehash all keys, substituting new buffers at the end.
*/
protected void allocateThenInsertThenRehash(int slot, int pendingKey, byte pendingValue) {
assert assigned == resizeAt
&& (( keys[slot]) == 0)
&& !((pendingKey) == 0);
// Try to allocate new buffers first. If we OOM, we leave in a consistent state.
final int[] prevKeys = this.keys;
final byte[] prevValues = this.values;
allocateBuffers(nextBufferSize(mask + 1, size(), loadFactor));
assert this.keys.length > prevKeys.length;
// We have succeeded at allocating new data so insert the pending key/value at
// the free slot in the old arrays before rehashing.
prevKeys[slot] = pendingKey;
prevValues[slot] = pendingValue;
// Rehash old keys, including the pending key.
rehash(prevKeys, prevValues);
}
/**
* Shift all the slot-conflicting keys and values allocated to
* (and including) slot.
*/
protected void shiftConflictingKeys(int gapSlot) {
final int[] keys = this.keys;
final byte[] values = this.values;
final int mask = this.mask;
// Perform shifts of conflicting keys to fill in the gap.
int distance = 0;
while (true) {
final int slot = (gapSlot + (++distance)) & mask;
final int existing = keys[slot];
if (((existing) == 0)) {
break;
}
final int idealSlot = hashKey(existing);
final int shift = (slot - idealSlot) & mask;
if (shift >= distance) {
// Entry at this position was originally at or before the gap slot.
// Move the conflict-shifted entry to the gap's position and repeat the procedure
// for any entries to the right of the current position, treating it
// as the new gap.
keys[gapSlot] = existing;
values[gapSlot] = values[slot];
gapSlot = slot;
distance = 0;
}
}
// Mark the last found gap slot without a conflict as empty.
keys[gapSlot] = 0;
values[gapSlot] = ((byte) 0);
assigned--;
}
}
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