/*
 * Copyright 2010, 2011, 2012 mapsforge.org
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.mapsforge.android.maps.overlay;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import android.graphics.Paint;

/**
 * ArrayCircleOverlay is a thread-safe implementation of the {@link CircleOverlay} class using an {@link ArrayList} as
 * internal data structure. Default paints for all {@link OverlayCircle OverlayCircles} without individual paints can be
 * defined via the constructor.
 */
public class ArrayCircleOverlay extends CircleOverlay<OverlayCircle> {
	private static final int INITIAL_CAPACITY = 8;
	private static final String THREAD_NAME = "ArrayCircleOverlay";

	private final List<OverlayCircle> overlayCircles;

	/**
	 * @param defaultPaintFill
	 *            the default paint which will be used to fill the circles (may be null).
	 * @param defaultPaintOutline
	 *            the default paint which will be used to draw the circle outlines (may be null).
	 */
	public ArrayCircleOverlay(Paint defaultPaintFill, Paint defaultPaintOutline) {
		super(defaultPaintFill, defaultPaintOutline);
		this.overlayCircles = new ArrayList<>(INITIAL_CAPACITY);
	}

	/**
	 * Adds the given circle to the overlay.
	 * 
	 * @param overlayCircle
	 *            the circle that should be added to the overlay.
	 */
	public void addCircle(OverlayCircle overlayCircle) {
		synchronized (this.overlayCircles) {
			this.overlayCircles.add(overlayCircle);
		}
		populate();
	}

	/**
	 * Adds all circles of the given collection to the overlay.
	 * 
	 * @param c
	 *            collection whose circles should be added to the overlay.
	 */
	public void addCircles(Collection<? extends OverlayCircle> c) {
		synchronized (this.overlayCircles) {
			this.overlayCircles.addAll(c);
		}
		populate();
	}

	/**
	 * Removes all circles from the overlay.
	 */
	public void clear() {
		synchronized (this.overlayCircles) {
			this.overlayCircles.clear();
		}
		populate();
	}

	@Override
	public String getThreadName() {
		return THREAD_NAME;
	}

	/**
	 * Removes the given circle from the overlay.
	 * 
	 * @param overlayCircle
	 *            the circle that should be removed from the overlay.
	 */
	public void removeCircle(OverlayCircle overlayCircle) {
		synchronized (this.overlayCircles) {
			this.overlayCircles.remove(overlayCircle);
		}
		populate();
	}

	@Override
	public int size() {
		synchronized (this.overlayCircles) {
			return this.overlayCircles.size();
		}
	}

	@Override
	protected OverlayCircle createCircle(int index) {
		synchronized (this.overlayCircles) {
			if (index >= this.overlayCircles.size()) {
				return null;
			}
			return this.overlayCircles.get(index);
		}
	}
}