public boolean removeOccurrences(Object item, int occurrences) {
if (occurrences < 0) {
throw new IllegalArgumentException("Cannot remove a negative number of occurrences");
}
if (occurrences == 0) {
return false;
}
Counter counter = this.items.get(item);
if (counter == null) {
return false;
}
int start = counter.getCount();
if (occurrences >= start) {
this.items.remove(item);
this.size -= start;
return true;
}
counter.add(occurrences * -1);
this.size -= occurrences;
return true;
}
@Test
public void iterator() {
Counter counter = new Counter();
for (Object each : this.unmodifiableCollection) {
counter.increment();
}
Assert.assertEquals(4, counter.getCount());
}
@Test
public void forEachWithIndex() {
final Counter counter = new Counter();
this.unmodifiableCollection.forEachWithIndex(
new ObjectIntProcedure<String>() {
public void value(String band, int index) {
counter.add(index);
}
});
Assert.assertEquals(6, counter.getCount());
}
@Test
public void forEach() {
final Counter counter = new Counter();
this.unmodifiableCollection.forEach(
new Procedure<String>() {
public void value(String band) {
counter.increment();
}
});
Assert.assertEquals(4, counter.getCount());
}
@Override
public boolean removeAllIterable(Iterable<?> iterable) {
int oldSize = this.size;
for (Object each : iterable) {
Counter removed = this.items.remove(each);
if (removed != null) {
this.size -= removed.getCount();
}
}
return this.size != oldSize;
}
@Override
public int hashCode() {
final Counter counter = new Counter();
this.forEachWithOccurrences(
new ObjectIntProcedure<T>() {
public void value(T each, int count) {
counter.add((each == null ? 0 : each.hashCode()) ^ count);
}
});
return counter.getCount();
}
@Override
public <P> int countWith(final Predicate2<? super T, ? super P> predicate, final P parameter) {
final Counter result = new Counter();
this.forEachWithOccurrences(
new ObjectIntProcedure<T>() {
public void value(T each, int occurrences) {
if (predicate.accept(each, parameter)) {
result.add(occurrences);
}
}
});
return result.getCount();
}
@Override
public boolean remove(Object item) {
Counter counter = this.items.get(item);
if (counter != null) {
if (counter.getCount() > 1) {
counter.decrement();
} else {
this.items.remove(item);
}
this.size--;
return true;
}
return false;
}
public int occurrencesOf(Object item) {
Counter counter = this.items.get(item);
return counter == null ? 0 : counter.getCount();
}