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|
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.property.ListProperty;
import javafx.beans.property.SimpleListProperty;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
/**
* Offers a simple implementation for filtered list.
* <br/>Filtered lists are non-modifiable.
* @todo See if this is needed again when switching to JDK8.
* @author Fabrice Bouyé (fabriceb@spc.int)
*/
public final class FilteredObservableList<T> implements ObservableList<T> {
/**
* Inner delegated list.
*/
private ObservableList<T> delegated;
/**
* Creates a new empty instance.
*/
public FilteredObservableList() {
this(null);
}
/**
* Creates a new instance from a regular list.
* <br/>Direct changes in the underlying list will not be reported to this list.
* @param source The source list.
* @param predicates The predicates used to filter this list.
*/
public FilteredObservableList(final List<T> source, final Predicate<T>... predicates) {
this(FXCollections.observableList(source), predicates);
}
/**
* Creates a new instance from an observable list.
* @param source The source list.
* @param predicates The predicates used to filter this list.
*/
public FilteredObservableList(final ObservableList<T> source, final Predicate<T>... predicates) {
setSource(source);
getPredicates().addAll(predicates);
//
sourceProperty().addListener(sourceListChangeListener);
predicatesProperty().addListener(predicatesListChangeListener);
//
populateDelegatedList();
}
/**
* Listen for changes in the source list.
*/
private ListChangeListener<T> sourceListChangeListener = new ListChangeListener<T>() {
@Override
public void onChanged(ListChangeListener.Change<? extends T> change) {
populateDelegatedList();
}
};
/**
* Listen for changes in the predicate list.
*/
private ListChangeListener<Predicate<T>> predicatesListChangeListener = new ListChangeListener<Predicate<T>>() {
@Override
public void onChanged(ListChangeListener.Change<? extends Predicate<T>> change) {
populateDelegatedList();
}
};
/**
* Test the predicate on a value.s
* @param value The value to be test.
* @return The result of the test.
*/
private boolean testPredicates(T value) {
boolean result = false;
for (Predicate<T> predicate : predicates) {
result = predicate.delegate(value);
if (!result) {
break;
}
}
return result;
}
/**
* Populate filtered list.
*/
private void populateDelegatedList() {
final List<T> toBeAdded = new LinkedList<>();
for (T value : source) {
if (testPredicates(value)) {
toBeAdded.add(value);
}
}
if (delegated == null) {
delegated = FXCollections.observableList(new LinkedList<T>());
delegated.addListener(delegatedInvalidationListener);
delegated.addListener(delegatedChangeListener);
}
delegated.setAll(toBeAdded);
toBeAdded.clear();
}
/**
* Listen for invalidation in the delegated list.
*/
private InvalidationListener delegatedInvalidationListener = new InvalidationListener() {
@Override
public void invalidated(Observable o) {
initListenerList();
for (Object object : listenerList) {
if (object instanceof InvalidationListener) {
InvalidationListener invalidationListener = (InvalidationListener) object;
invalidationListener.invalidated(o);
}
}
}
};
/**
* Listen for changes in the delegated list.
*/
private ListChangeListener<T> delegatedChangeListener = new ListChangeListener<T>() {
@Override
public void onChanged(final ListChangeListener.Change<? extends T> change) {
if (listenerList != null) {
ListChangeListener.Change<? extends T> newChange = new ListChangeListener.Change(FilteredObservableList.this) {
@Override
public boolean next() {
return change.next();
}
@Override
public void reset() {
change.reset();
}
@Override
public int getFrom() {
return change.getFrom();
}
@Override
public int getTo() {
return change.getTo();
}
@Override
public List getRemoved() {
return change.getRemoved();
}
@Override
protected int[] getPermutation() {
// Not sure about this.
if (!change.wasPermutated()) {
return new int[0];
} else {
int[] permutations = new int[delegated.size()];
for (int index = 0; index < permutations.length; index++) {
permutations[index] = change.getPermutation(index);
}
return permutations;
}
}
};
initListenerList();
for (Object object : listenerList) {
if (object instanceof ListChangeListener) {
ListChangeListener listChangeListener = (ListChangeListener) object;
newChange.reset();
listChangeListener.onChanged(newChange);
}
}
}
}
};
////////////////////////////////////////////////////////////////////////////
// Size support.
/**
* {@inheritDoc}
*/
@Override
public int size() {
return delegated.size();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isEmpty() {
return delegated.isEmpty();
}
////////////////////////////////////////////////////////////////////////////
// Modifiable methods, all disabled.
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean setAll(T... es) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean setAll(Collection<? extends T> clctn) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public T set(int index, T element) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean addAll(T... es) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean addAll(Collection<? extends T> c) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean addAll(int index, Collection<? extends T> c) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean add(T e) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public void add(int index, T element) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public void clear() {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean removeAll(T... es) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean removeAll(Collection<?> c) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public void remove(int i, int i1) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean retainAll(T... es) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public boolean retainAll(Collection<?> c) {
throw new UnsupportedOperationException("Not supported.");
}
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public T remove(int index) {
throw new UnsupportedOperationException("Not supported.");
}
////////////////////////////////////////////////////////////////////////////
// Get support.
/**
* {@inheritDoc}
* @throws UnsupportedOperationException Always.
*/
@Override
public T get(int index) {
return delegated.get(index);
}
////////////////////////////////////////////////////////////////////////////
// Contains support.
/**
* {@inheritDoc}
*/
@Override
public boolean contains(Object o) {
return delegated.contains(o);
}
/**
* {@inheritDoc}
*/
@Override
public boolean containsAll(Collection<?> c) {
return delegated.containsAll(c);
}
/**
* {@inheritDoc}
*/
@Override
public int indexOf(Object o) {
return delegated.indexOf(o);
}
/**
* {@inheritDoc}
*/
@Override
public int lastIndexOf(Object o) {
return delegated.lastIndexOf(o);
}
////////////////////////////////////////////////////////////////////////////
// Misc.
/**
* {@inheritDoc}
*/
@Override
public Object[] toArray() {
return delegated.toArray();
}
/**
* {@inheritDoc}
*/
@Override
public <T> T[] toArray(T[] a) {
return delegated.toArray(a);
}
@Override
public String toString() {
return delegated.toString();
}
////////////////////////////////////////////////////////////////////////////
// Iterator support.
/**
* {@inheritDoc}
*/
@Override
public ListIterator<T> listIterator() {
return delegated.listIterator();
}
/**
* {@inheritDoc}
*/
@Override
public ListIterator<T> listIterator(int index) {
return delegated.listIterator(index);
}
/**
* {@inheritDoc}
*/
@Override
public Iterator<T> iterator() {
return delegated.iterator();
}
////////////////////////////////////////////////////////////////////////////
// Sub-list support.
/**
* {@inheritDoc}
*/
@Override
public List<T> subList(int fromIndex, int toIndex) {
return delegated.subList(fromIndex, toIndex);
}
////////////////////////////////////////////////////////////////////////////
// Listener support.
private List<Object> listenerList = null;
private synchronized void initListenerList() {
if (listenerList == null) {
listenerList = new LinkedList<>();
}
}
/**
* {@inheritDoc}
*/
@Override
public void addListener(ListChangeListener ll) {
if (ll != null) {
initListenerList();
listenerList.add(ll);
}
}
/**
* {@inheritDoc}
*/
@Override
public void removeListener(ListChangeListener ll) {
if (listenerList != null && ll != null) {
listenerList.remove(ll);
}
}
/**
* {@inheritDoc}
*/
@Override
public void addListener(InvalidationListener il) {
if (il != null) {
initListenerList();
listenerList.add(il);
}
}
/**
* {@inheritDoc}
*/
@Override
public void removeListener(InvalidationListener il) {
if (listenerList != null && il != null) {
listenerList.remove(il);
}
}
////////////////////////////////////////////////////////////////////////////
/**
* Source list of this filtered list.
*/
private final ListProperty<T> source = new SimpleListProperty<>(this, "source", FXCollections.observableList(new LinkedList<T>())); // NOI18N.
public final ObservableList<T> getSource() {
return source.get();
}
public final void setSource(final ObservableList<T> value) {
source.set(value);
}
public final ListProperty<T> sourceProperty() {
return source;
}
/**
* List of predicates in this filtered list.
*/
private final ListProperty<Predicate<T>> predicates = new SimpleListProperty<>(this, "predicates", FXCollections.observableList(new LinkedList<Predicate<T>>())); // NOI18N.
public final ObservableList<Predicate<T>> getPredicates() {
return predicates.get();
}
public final void setPredicates(final ObservableList<Predicate<T>> value) {
predicates.set(value);
}
public final ListProperty<Predicate<T>> predicatesProperty() {
return predicates;
}
} |
JavaFX - Trier ou Filtrer
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