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TransformationObservableList.java
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TransformationObservableList.java
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package org.genericsystem.defaults.tools;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.Function;
import com.sun.javafx.collections.ObservableListWrapper;
import javafx.beans.Observable;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.util.Callback;
/**
* @author Nicolas Feybesse
*
* @param <SOURCE>
* @param <TARGET>
*/
public class TransformationObservableList<SOURCE, TARGET> extends ObservableListWrapper<TARGET> implements ListChangeListener<SOURCE> {
private final BiConsumer<Integer, SOURCE> addBiConsumer;
private final ObservableList<SOURCE> external;
private final Consumer<Integer> removeConsumer;
private BindingHelperObserver<SOURCE> observer;
public final void bind() {
if (observer == null)
observer = new BindingHelperObserver<>(this);
external.addListener(observer);
}
public final void unbind() {
if (observer != null)
external.removeListener(observer);
observer = null;
}
public BiConsumer<Integer, SOURCE> getAddBiConsumer() {
return addBiConsumer;
}
public Consumer<Integer> getRemoveConsumer() {
return removeConsumer;
}
public static class BindingHelperObserver<E> implements ListChangeListener<E> {
private final WeakReference<TransformationObservableList<E, ?>> ref;
public BindingHelperObserver(TransformationObservableList<E, ?> transformationList) {
if (transformationList == null) {
throw new NullPointerException("Binding has to be specified.");
}
ref = new WeakReference<TransformationObservableList<E, ?>>(transformationList);
}
@Override
public void onChanged(Change<? extends E> change) {
final TransformationObservableList<E, ?> binding = ref.get();
if (binding == null) {
change.getList().removeListener(this);
} else {
binding.onChanged(change);
}
}
}
public TransformationObservableList(ObservableList<SOURCE> external, Function<SOURCE, TARGET> srcToTarget) {
super(new ArrayList<>());
this.external = external; // prevent of listener garbage collection
this.addBiConsumer = (index, src) -> add(index, srcToTarget.apply(src));
this.removeConsumer = index -> remove(index.intValue());
bind();
init();
}
public void init() {
int i = 0;
beginChange();
for (SOURCE element : external)
getAddBiConsumer().accept(i++, element);
endChange();
}
public TransformationObservableList(ObservableList<SOURCE> external, Function<SOURCE, TARGET> srcToTarget, Callback<TARGET, Observable[]> extractor) {
super(new ArrayList<>(), extractor);
this.external = external; // prevents of listener garbage collection
this.addBiConsumer = (index, src) -> add(index, srcToTarget.apply(src));
this.removeConsumer = index -> remove(index.intValue());
bind();
init();
}
public TransformationObservableList(ObservableList<SOURCE> external, BiFunction<Integer, SOURCE, TARGET> add, Consumer<TARGET> consumer) {
super(new ArrayList<>());
this.external = external; // prevents of listener garbage collection
this.addBiConsumer = (index, src) -> add(index, add.apply(index, src));
this.removeConsumer = index -> consumer.accept(remove(index.intValue()));
bind();
init();
}
public TransformationObservableList(ObservableList<SOURCE> external, BiFunction<Integer, SOURCE, TARGET> add, Consumer<TARGET> consumer, Callback<TARGET, Observable[]> extractor) {
super(new ArrayList<>(), extractor);
this.external = external; // prevents of listener garbage collection
this.addBiConsumer = (index, src) -> add(index, add.apply(index, src));
this.removeConsumer = index -> consumer.accept(remove(index.intValue()));
bind();
init();
}
public TransformationObservableList(ObservableList<SOURCE> external, BiFunction<Integer, SOURCE, TARGET> add) {
super(new ArrayList<>());
this.external = external; // prevents of listener garbage collection
this.addBiConsumer = (index, src) -> add(index, add.apply(index, src));
this.removeConsumer = index -> remove(index.intValue());
bind();
}
@Override
public void onChanged(Change<? extends SOURCE> change) {
while (change.next()) {
beginChange();
if (change.wasPermutated()) {
assert false;// Not tested after
for (int i = change.getFrom(); i < change.getTo(); i++)
getRemoveConsumer().accept(change.getFrom());
int index = change.getFrom();
for (SOURCE source : change.getList().subList(change.getFrom(), change.getTo()))
getAddBiConsumer().accept(index++, source);
} else {
if (change.wasRemoved()) {
for (int i = 0; i < change.getRemovedSize(); i++)
getRemoveConsumer().accept(change.getFrom());
}
if (change.wasAdded()) {
int index = change.getFrom();
for (SOURCE source : change.getAddedSubList())
getAddBiConsumer().accept(index++, source);
}
}
endChange();
}
}
}