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PseudoConcurrentCollection.java
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PseudoConcurrentCollection.java
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package org.genericsystem.common;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Spliterators;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Predicate;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.genericsystem.api.core.Filters;
import org.genericsystem.api.core.Filters.IndexFilter;
import org.genericsystem.api.core.IGeneric;
import org.genericsystem.api.core.IteratorSnapshot;
import org.genericsystem.api.core.Snapshot;
import javafx.beans.Observable;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.WeakChangeListener;
/**
* @author Nicolas Feybesse
*
* @param <T>
*/
public class PseudoConcurrentCollection<T> implements IteratorSnapshot<T> {
private static interface Index<T> {
public void add(T generic);
public boolean remove(T generic);
public Iterator<T> iterator();
public Stream<T> stream();
}
final Map<T, T> map = new HashMap<>();
@SuppressWarnings("unchecked")
private final ConcurrentHashMap<IndexFilter<T>, Index<T>> indexs = new ConcurrentHashMap<IndexFilter<T>, Index<T>>() {
{
put((IndexFilter<T>) Filters.NO_FILTER, new IndexImpl((IndexFilter<T>) Filters.NO_FILTER));
}
private static final long serialVersionUID = 6592932243687280301L;
@Override
public Index<T> get(Object key) {
return super.computeIfAbsent((IndexFilter<T>) key, k -> new IndexImpl(k));
};
};
private class IndexImpl implements Index<T> {
private Node<T> head = null;
private Node<T> tail = null;
IndexImpl(IndexFilter<T> filter) {
if (!Filters.NO_FILTER.equals(filter))
indexs.get(Filters.NO_FILTER).iterator().forEachRemaining(generic -> {
if (filter.test(generic))
add(generic);
});
}
@Override
public void add(T element) {
assert element != null;
Node<T> newNode = new Node<>(element);
if (head == null)
head = newNode;
else
tail.next = newNode;
tail = newNode;
map.put(element, element);
}
@Override
public boolean remove(T element) {
Iterator<T> iterator = iterator();
while (iterator.hasNext())
if (element.equals(iterator.next())) {
iterator.remove();
return true;
}
return false;
}
@Override
public Iterator<T> iterator() {
return new InternalIterator();
}
@Override
public Stream<T> stream() {
return StreamSupport.stream(Spliterators.spliteratorUnknownSize(new InternalIterator(), 0), false);
}
public class InternalIterator extends AbstractIterator<Node<T>, T> implements Iterator<T> {
private Node<T> last;
@Override
protected void advance() {
last = next;
next = next == null ? head : next.next;
}
@Override
public T project() {
return next.content;
}
@Override
public void remove() {
T content = next.content;
if (next == null)
throw new IllegalStateException();
map.remove(next.content);
if (last == null) {
head = next.next;
next = null;
} else {
last.next = next.next;
if (next.next == null)
tail = last;
}
}
}
}
private static class Node<T> {
private final T content;
private Node<T> next;
private Node(T content) {
this.content = content;
}
}
@Override
public Iterator<T> iterator() {
return indexs.get(Filters.NO_FILTER).iterator();
}
public Stream<T> stream(IndexFilter<T> filter) {
return indexs.get(filter).stream();
}
@SuppressWarnings("unchecked")
@Override
public Stream<T> stream() {
return stream((IndexFilter<T>) Filters.NO_FILTER);
}
@SuppressWarnings("unchecked")
@Override
public <U extends IGeneric<U>> Snapshot<T> filter(Filters filter, U... generics) {
return new Snapshot<T>() {
@Override
public Stream<T> stream() {
return PseudoConcurrentCollection.this.stream(filter.getFilter(generics));
}
};
}
public void add(T element) {
indexs.entrySet().forEach(entry -> {
if (entry.getKey().test(element)) {
entry.getValue().add(element);
}
});
addProperty.set(element);
}
public boolean remove(T element) {
boolean[] result = new boolean[] { false };
indexs.entrySet().forEach(entry -> {
if (entry.getKey().test(element))
result[0] = result[0] | entry.getValue().remove(element);
});
removeProperty.set(element);
return result[0];
}
@Override
public T get(Object o) {
return map.get(o);
}
private SimpleObjectProperty<T> addProperty = new SimpleObjectProperty<T>();
private SimpleObjectProperty<T> removeProperty = new SimpleObjectProperty<T>();
private class FilteredInvalidator extends SimpleObjectProperty<T> {
private Predicate<T> predicate;
private ChangeListener<T> listener = (o, oldT, newT) -> {
if (fireInvalidations && predicate.test(newT))
super.fireValueChangedEvent();
};
private FilteredInvalidator(Predicate<T> predicate) {
this.predicate = predicate;
addProperty.addListener(new WeakChangeListener<T>(listener));
removeProperty.addListener(new WeakChangeListener<T>(listener));
}
}
private boolean fireInvalidations = true;
public Observable getFilteredInvalidator(T generic, Predicate<T> predicate) {
return new FilteredInvalidator(predicate);
}
public void disableInvalidations() {
fireInvalidations = false;
}
public void enableInvalidations() {
fireInvalidations = true;
}
}