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package javafx.collections;

import com.sun.javafx.collections.ArrayListenerHelper;
import javafx.beans.InvalidationListener;

Abstract class that serves as a base class for ObservableArray implementations. The base class provides listener handling functionality by implementing addListener and removeListener methods. fireChange(boolean, int, int) method is provided for notifying the listeners. 
Type parameters:
<T> – actual array instance type
See Also:
ObservableArray
ArrayChangeListener
Since:
JavaFX 8.0/**
 * Abstract class that serves as a base class for {@link ObservableArray} implementations.
 * The base class provides listener handling functionality by implementing
 * {@code addListener} and {@code removeListener} methods.
 * {@link #fireChange(boolean, int, int) } method is provided
 *      for notifying the listeners.
 * @param <T> actual array instance type
 * @see ObservableArray
 * @see ArrayChangeListener
 * @since JavaFX 8.0
 */
public abstract class ObservableArrayBase<T extends ObservableArray<T>> implements ObservableArray<T> {

    private ArrayListenerHelper<T> listenerHelper;

    @Override public final void addListener(InvalidationListener listener) {
        listenerHelper = ArrayListenerHelper.<T>addListener(listenerHelper, (T) this, listener);
    }

    @Override public final void removeListener(InvalidationListener listener) {
        listenerHelper = ArrayListenerHelper.removeListener(listenerHelper, listener);
    }

    @Override public final void addListener(ArrayChangeListener<T> listener) {
        listenerHelper = ArrayListenerHelper.<T>addListener(listenerHelper, (T) this, listener);
    }

    @Override public final void removeListener(ArrayChangeListener<T> listener) {
        listenerHelper = ArrayListenerHelper.removeListener(listenerHelper, listener);
    }

    
Notifies all listeners of a change
Params:
sizeChanged – indicates size of array changed
from – A beginning (inclusive) of an interval related to the change
to – An end (exclusive) of an interval related to the change./**
     * Notifies all listeners of a change
     * @param sizeChanged indicates size of array changed
     * @param from A beginning (inclusive) of an interval related to the change
     * @param to An end (exclusive) of an interval related to the change.
     */
    protected final void fireChange(boolean sizeChanged, int from, int to) {
        ArrayListenerHelper.fireValueChangedEvent(listenerHelper, sizeChanged, from, to);
    }
}