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/*
* Copyright (c) 2011, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.javafx.css;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import com.sun.javafx.collections.SetListenerHelper;
import javafx.beans.InvalidationListener;
import javafx.collections.FXCollections;
import javafx.collections.ObservableSet;
import javafx.collections.SetChangeListener;
/**
* Pseudo-class state and style-classes are represented as bits in a long[]
* which makes matching faster.
*/
abstract class BitSet extends AbstractSet implements ObservableSet {
/** Create an empty set of T */
protected BitSet () {
this.bits = EMPTY_SET;
}
/** {@inheritDoc} */
@Override
public int size() {
int size = 0;
if (bits.length > 0) {
for (int n = 0; n < bits.length; n++) {
final long mask = bits[n];
if (mask != 0) {
size += Long.bitCount(mask);
}
}
}
// index.length is zero or all index[n] values are zero
return size;
}
@Override
public boolean isEmpty() {
if (bits.length > 0) {
for (int n = 0; n < bits.length; n++) {
final long mask = bits[n];
if (mask != 0) {
return false;
}
}
}
// index.length is zero or all index[n] values are zero
return true;
}
/**
* {@inheritDoc} This returned iterator is not fail-fast.
*/
@Override
public Iterator iterator() {
return new Iterator<>() {
int next = -1;
int element = 0;
int index = -1;
@Override
public boolean hasNext() {
if (bits == null || bits.length == 0) {
return false;
}
boolean found = false;
do {
if (++next >= Long.SIZE) {
if (++element < bits.length) {
next = 0;
} else {
return false;
}
}
long bit = 1l << next;
found = (bit & bits[element]) == bit;
} while( !found );
if (found) {
index = Long.SIZE * element + next;
}
return found;
}
@Override
public T next() {
try {
return getT(index);
} catch (IndexOutOfBoundsException e) {
throw new NoSuchElementException("["+element+"]["+next+"]");
}
}
@Override
public void remove() {
try {
T t = getT(index);
BitSet.this.remove(t);
} catch (IndexOutOfBoundsException e) {
throw new NoSuchElementException("["+element+"]["+next+"]");
}
}
};
}
/** {@inheritDoc} */
@Override
public boolean add(T t) {
if (t == null) {
// this not modified!
return false;
}
final int element = getIndex(t) / Long.SIZE;
final long bit = 1l << (getIndex(t) % Long.SIZE);
// need to grow?
if (element >= bits.length) {
final long[] temp = new long[element + 1];
System.arraycopy(bits, 0, temp, 0, bits.length);
bits = temp;
}
final long temp = bits[element];
bits[element] = temp | bit;
// if index[element] == temp, then the bit was already set
final boolean modified = (bits[element] != temp);
if (modified && SetListenerHelper.hasListeners(listenerHelper)){
notifyObservers(t, Change.ELEMENT_ADDED);
}
return modified;
}
/** {@inheritDoc} */
@Override
public boolean remove(Object o) {
if (o == null) {
// this not modified!
return false;
}
Class elementType = getElementType();
if (!elementType.isInstance(o)) { // if cast failed, it can't be part of this set, so not modified
return false;
}
T t = elementType.cast(o);
int index = getIndex(t);
int element = index / Long.SIZE;
long bit = 1l << (index % Long.SIZE);
if (element >= bits.length) {
// not in this Set!
return false;
}
final long temp = bits[element];
bits[element] = temp & ~bit;
// if index[element] == temp, then the bit was not there
final boolean modified = (bits[element] != temp);
if (modified) {
if (SetListenerHelper.hasListeners(listenerHelper)) {
notifyObservers(t, Change.ELEMENT_REMOVED);
}
// did removing the bit leave an empty set?
boolean isEmpty = true;
for (int n=0; n elementType = getElementType();
if (!elementType.isInstance(o)) {
return false;
}
int index = getIndex(elementType.cast(o));
int element = index / Long.SIZE;
long bit = 1L << (index % Long.SIZE);
return (element < bits.length) && (bits[element] & bit) == bit;
}
@Override
public boolean containsAll(Collection c) {
if (this.getClass() != c.getClass()) { // implicit null check here is intended
for (Object obj : c) {
if (!contains(obj)) {
return false;
}
}
return true;
}
BitSet other = (BitSet)c;
// this contains all of other if both are empty
if (bits.length == 0 && other.bits.length == 0) {
return true;
}
// [foo] cannot contain all of [foo bar]
if (bits.length < other.bits.length) {
return false;
}
// does [foo bar bang] contain all of [foo bar]?
for (int n = 0, max = other.bits.length; n < max; n++) {
if ((bits[n] & other.bits[n]) != other.bits[n]) {
return false;
}
}
return true;
}
@Override
public boolean addAll(Collection c) {
if (this.getClass() != c.getClass()) { // implicit null check here is intended
boolean modified = false;
for (T obj : c) {
modified |= add(obj);
}
return modified;
}
boolean modified = false;
BitSet other = (BitSet)c;
final long[] maskOne = this.bits;
final long[] maskTwo = other.bits;
final int a = maskOne.length;
final int b = maskTwo.length;
// Math.max(maskOne.length, maskTwo.length) is too slow
final int max = a < b ? b : a;
final long[] union = max > 0 ? new long[max] : EMPTY_SET;
for(int n = 0; n < max; n++) {
if (n < maskOne.length && n < maskTwo.length) {
union[n] = maskOne[n] | maskTwo[n];
modified |= (union[n] != maskOne[n]);
} else if (n < maskOne.length) {
union[n] = maskOne[n];
modified |= false;
} else {
union[n] = maskTwo[n];
modified = true;
}
}
if (modified) {
if (SetListenerHelper.hasListeners(listenerHelper)) {
for (int n = 0; n < max; n++) {
long bitsAdded = 0l;
if (n < maskOne.length && n < maskTwo.length) {
bitsAdded = ~maskOne[n] & maskTwo[n];
} else if (n < maskOne.length) {
// union[n] = maskOne[n], so no bits added
continue;
} else {
bitsAdded = maskTwo[n];
}
for(int bit = 0; bit < Long.SIZE; bit++) {
long m = 1l << bit;
if ((m & bitsAdded) == m) {
T t = getT(n*Long.SIZE + bit);
notifyObservers(t, Change.ELEMENT_ADDED);
}
}
}
}
this.bits = union;
}
return modified;
}
@Override
public boolean retainAll(Collection c) {
if (this.getClass() != c.getClass()) { // implicit null check here is intended
boolean modified = false;
for (Iterator iterator = this.iterator(); iterator.hasNext();) {
T obj = iterator.next();
if (!c.contains(obj)) {
iterator.remove();
modified = true;
}
}
return modified;
}
boolean modified = false;
BitSet other = (BitSet)c;
final long[] maskOne = this.bits;
final long[] maskTwo = other.bits;
final int a = maskOne.length;
final int b = maskTwo.length;
// Math.min(maskOne.length, maskTwo.length) is too slow
final int max = a < b ? a : b;
final long[] intersection = max > 0 ? new long[max] : EMPTY_SET;
//
// Make sure modified is set if maskOne has more bits than maskTwo.
// If max is zero, then the loop that does the intersection is
// never entered (since maskTwo is empty). If modified isn't set,
// then the if (modified) block isn't entered and this.bits isn't
// set to the intersection.
//
modified |= (maskOne.length > max);
//
// RT-32872 - If the intersection is empty, then set bits to the EMPTY_SET.
// This ensures that {a,b,c}.retainAll({}) yields bits = EMPTY_SET as
// opposed to bits = long[1] and bits[0] == 0.
//
// Assume isEmpty is true. If any intersection[n] != 0,
// isEmpty will be set to false and will remain false.
//
//
boolean isEmpty = true;
for(int n = 0; n < max; n++) {
intersection[n] = maskOne[n] & maskTwo[n];
modified |= intersection[n] != maskOne[n];
isEmpty &= intersection[n] == 0;
}
if (modified) {
if (SetListenerHelper.hasListeners(listenerHelper)) {
for (int n = 0; n < maskOne.length; n++) {
long bitsRemoved = 0l;
if (n < maskTwo.length) {
bitsRemoved = maskOne[n] & ~maskTwo[n];
} else {
// maskTwo was shorter than maskOne,
// and remaining bits in maskOne (which is this.bits) were removed
bitsRemoved = maskOne[n];
}
for(int bit = 0; bit < Long.SIZE; bit++) {
long m = 1l << bit;
if ((m & bitsRemoved) == m) {
T t = getT(n*Long.SIZE + bit);
notifyObservers(t, Change.ELEMENT_REMOVED);
}
}
}
}
this.bits = isEmpty == false ? intersection : EMPTY_SET;
}
return modified;
}
@Override
public boolean removeAll(Collection c) {
if (this.getClass() != c.getClass()) { // implicit null check here is intended
boolean modified = false;
for (Object obj : c) {
modified |= remove(obj);
}
return modified;
}
boolean modified = false;
BitSet other = (BitSet)c;
final long[] maskOne = bits;
final long[] maskTwo = other.bits;
final int a = maskOne.length;
final int b = maskTwo.length;
// Math.min(maskOne.length, maskTwo.length) is too slow
final int max = a < b ? a : b;
final long[] difference = max > 0 ? new long[max] : EMPTY_SET;
//
// RT-32872 - If the intersection is empty, then set bits to the EMPTY_SET.
// This ensures that {a,b,c}.retainAll({}) yields bits = EMPTY_SET as
// opposed to bits = long[1] and bits[0] == 0.
//
// Assume isEmpty is true. If any difference[n] != 0,
// isEmpty will be set to false and will remain false.
//
//
boolean isEmpty = true;
for(int n = 0; n < max; n++) {
difference[n] = maskOne[n] & ~maskTwo[n];
modified |= difference[n] != maskOne[n];
isEmpty &= difference[n] == 0;
}
if (modified) {
if (SetListenerHelper.hasListeners(listenerHelper)) {
for (int n = 0; n < max; n++) {
long bitsRemoved = maskOne[n] & maskTwo[n];
for(int bit = 0; bit < Long.SIZE; bit++) {
long m = 1l << bit;
if ((m & bitsRemoved) == m) {
T t = getT(n*Long.SIZE + bit);
notifyObservers(t, Change.ELEMENT_REMOVED);
}
}
}
}
this.bits = isEmpty == false ? difference : EMPTY_SET;
}
return modified;
}
@Override
public void clear() {
for (int n = 0; n < bits.length; n++) {
long bitsRemoved = bits[n];
for(int b = 0; b < Long.SIZE; b++) {
long m = 1l << b;
if ((m & bitsRemoved) == m) {
T t = getT(n*Long.SIZE + b);
notifyObservers(t, Change.ELEMENT_REMOVED);
}
}
}
bits = EMPTY_SET;
}
@Override
public int hashCode() {
// Note: overridden because equals is overridden; both equals and hashCode MUST
// respect the Set contract to interact correctly with sets of other types!
return super.hashCode();
}
@Override
public boolean equals(Object obj) {
// Note: overridden to provide a fast path; both equals and hashCode MUST respect
// the Set contract to interact correctly with sets of other types!
if (obj == this) {
return true;
}
if (getClass() == obj.getClass()) { // fast path if other is exact same type of BitSet
return equalsBitSet((BitSet) obj);
}
return super.equals(obj);
}
private boolean equalsBitSet(BitSet other) {
int a = this.bits != null ? this.bits.length : 0;
int b = other.bits != null ? other.bits.length : 0;
int max = Math.max(a, b);
for (int i = 0; i < max; i++) {
long m0 = i >= a ? 0 : this.bits[i];
long m1 = i >= b ? 0 : other.bits[i];
if (m0 != m1) {
return false;
}
}
return true;
}
protected abstract T getT(int index);
protected abstract int getIndex(T t);
/**
* Returns the element type.
*
* @return a {@link Class} of type {@code T}, never {@code null}
*/
protected abstract Class getElementType();
long[] getBits() {
return bits;
}
private static final long[] EMPTY_SET = new long[0];
// the set
private long[] bits;
private SetListenerHelper listenerHelper;
private class Change extends SetChangeListener.Change {
private static final boolean ELEMENT_ADDED = false;
private static final boolean ELEMENT_REMOVED = true;
private final T element;
private final boolean removed;
public Change(T element, boolean removed) {
super(FXCollections.unmodifiableObservableSet(BitSet.this));
this.element = element;
this.removed = removed;
}
@Override
public boolean wasAdded() {
return removed != ELEMENT_REMOVED;
}
@Override
public boolean wasRemoved() {
return removed;
}
@Override
public T getElementAdded() {
return removed ? null : element;
}
@Override
public T getElementRemoved() {
return removed ? element : null;
}
}
@Override
public void addListener(SetChangeListener setChangeListener) {
if (setChangeListener != null) {
listenerHelper = SetListenerHelper.addListener(listenerHelper, setChangeListener);
}
}
@Override
public void removeListener(SetChangeListener setChangeListener) {
if (setChangeListener != null) {
listenerHelper = SetListenerHelper.removeListener(listenerHelper, setChangeListener);
}
}
@Override
public void addListener(InvalidationListener invalidationListener) {
if (invalidationListener != null) {
listenerHelper = SetListenerHelper.addListener(listenerHelper, invalidationListener);
}
}
@Override
public void removeListener(InvalidationListener invalidationListener) {
if (invalidationListener != null) {
listenerHelper = SetListenerHelper.removeListener(listenerHelper, invalidationListener);
}
}
private void notifyObservers(T element, boolean removed) {
if (element != null && SetListenerHelper.hasListeners(listenerHelper)) {
Change change = new Change(element, removed);
SetListenerHelper.fireValueChangedEvent(listenerHelper, change);
}
}
}
