bundles/runtime/org.eclipse.fx.core/src/org/eclipse/fx/core/bindings/internal/MapListBinding.java

/*******************************************************************************
 * Copyright (c) 2016 BestSolution.at and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Christoph Caks<ccaks@bestsolution.at> - initial API and implementation
 *******************************************************************************/
package org.eclipse.fx.core.bindings.internal;

import java.util.function.Function;
import java.util.stream.Collectors;

import javafx.beans.InvalidationListener;
import javafx.beans.binding.ListBinding;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;

@SuppressWarnings("javadoc")
public class MapListBinding<A, B> extends ListBinding<B> {

	private ObservableList<A> source;
	private Function<A, B> map;

	private InvalidationListener onInvalidate = obs -> this.invalidate();

	public MapListBinding(ObservableList<A> source, Function<A, B> map) {
		this.source = source;
		this.map = map;
		initListeners();
	}

	private void initListeners() {
		this.source.addListener(this.onInvalidate);
	}

	private void disposeListeners() {
		this.source.removeListener(this.onInvalidate);
	}

	@Override
	protected ObservableList<B> computeValue() {
		return FXCollections.observableArrayList(this.source.stream().map(this.map).collect(Collectors.toList()));
	}

	@Override
	public void dispose() {
		disposeListeners();
		super.dispose();
	}
}