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SmallPriorityQueue.java
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181 lines (155 loc) · 3.54 KB
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/**
*
*/
package soot.util;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 1997 - 2018 Raja Vallée-Rai and others
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 of the
* License, or (at your option) any later version.
*
* This program 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>.
* #L%
*/
import static java.lang.Long.numberOfTrailingZeros;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* @author Steven Lambeth
*
*/
class SmallPriorityQueue<E> extends PriorityQueue<E> {
final static int MAX_CAPACITY = Long.SIZE;
private long queue = 0;
SmallPriorityQueue(List<? extends E> universe, Map<E, Integer> ordinalMap) {
super(universe, ordinalMap);
assert universe.size() <= Long.SIZE;
}
@Override
void addAll() {
if (N == 0) {
return;
}
queue = -1L >>> -N;
min = 0;
}
@Override
public void clear() {
queue = 0L;
min = Integer.MAX_VALUE;
}
@Override
public Iterator<E> iterator() {
return new Itr() {
@Override
long getExpected() {
return queue;
}
};
}
@Override
public int size() {
return Long.bitCount(queue);
}
@Override
int nextSetBit(int fromIndex) {
assert fromIndex >= 0;
if (fromIndex > N) {
return fromIndex;
}
long m0 = -1L << fromIndex;
long t0 = queue & m0;
if ((t0 & -m0) != 0) {
return fromIndex;
}
return numberOfTrailingZeros(t0);
}
@Override
boolean add(int ordinal) {
long old = queue;
queue |= (1L << ordinal);
if (old == queue) {
return false;
}
min = Math.min(min, ordinal);
return true;
}
@Override
boolean contains(int ordinal) {
assert ordinal >= 0;
assert ordinal < N;
return ((queue >>> ordinal) & 1L) == 1L;
}
@Override
boolean remove(int index) {
assert index >= 0;
assert index < N;
long old = queue;
queue &= ~(1L << index);
if (old == queue) {
return false;
}
if (min == index) {
min = nextSetBit(min + 1);
}
return true;
}
@Override
public boolean removeAll(Collection<?> c) {
long mask = 0;
for (Object o : c) {
mask |= (1L << getOrdinal(o));
}
long old = queue;
queue &= ~mask;
min = nextSetBit(min);
return old != queue;
}
@Override
public boolean retainAll(Collection<?> c) {
long mask = 0;
for (Object o : c) {
mask |= (1L << getOrdinal(o));
}
long old = queue;
queue &= mask;
min = nextSetBit(min);
return old != queue;
}
@Override
public boolean containsAll(Collection<?> c) {
long mask = 0;
for (Object o : c) {
mask |= (1L << getOrdinal(o));
}
return (mask & ~queue) == 0;
}
@Override
public boolean addAll(Collection<? extends E> c) {
long mask = 0;
for (Object o : c) {
mask |= (1L << getOrdinal(o));
}
long old = queue;
queue |= mask;
if (old == queue) {
return false;
}
min = nextSetBit(0);
return true;
}
}