RootChangeListener.java

package org.andork.event;

import java.util.function.Consumer;

public class RootChangeListener<M> implements HierarchicalBasicPropertyChangeListener {
	Consumer<M> consumer;

	/**
	 * Creates a {@code RootChangeListener}.
	 *
	 * @param consumer
	 *            the {@link Consumer} to which this {@code RootChangeListener}
	 *            will pass the root model of any change events it receives.
	 */
	public RootChangeListener(Consumer<M> consumer) {
		super();
		this.consumer = consumer;
	}

	@Override
	public void childrenChanged(Object source, ChangeType changeType, Object... children) {
		consumer.accept(getRootModel(source));
	}

	private M getRootModel(Object source) {
		if (source instanceof SourcePath) {
			return getRootModel(((SourcePath) source).parent);
		}
		return (M) source;
	}

	@Override
	public void propertyChange(Object source, Object property, Object oldValue, Object newValue, int index) {
		consumer.accept(getRootModel(source));
	}
}