/*
 * 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.oscim.theme.renderinstruction;

import java.io.IOException;

import org.oscim.core.Tag;
import org.oscim.theme.IRenderCallback;
import org.oscim.theme.RenderThemeHandler;
import org.xml.sax.Attributes;

import android.graphics.Bitmap;

/**
 * Represents an icon on the map.
 */
public final class Symbol extends RenderInstruction {
	/**
	 * @param elementName
	 *            the name of the XML element.
	 * @param attributes
	 *            the attributes of the XML element.
	 * @return a new Symbol with the given rendering attributes.
	 * @throws IOException
	 *             if an I/O error occurs while reading a resource.
	 */
	public static Symbol create(String elementName, Attributes attributes)
			throws IOException {
		String src = null;

		for (int i = 0; i < attributes.getLength(); ++i) {
			String name = attributes.getLocalName(i);
			String value = attributes.getValue(i);

			if ("src".equals(name)) {
				src = value;
			} else {
				RenderThemeHandler.logUnknownAttribute(elementName, name, value, i);
			}
		}

		validate(elementName, src);
		return new Symbol(src);
	}

	private static void validate(String elementName, String src) {
		if (src == null) {
			throw new IllegalArgumentException("missing attribute src for element: "
					+ elementName);
		}
	}

	public final Bitmap bitmap;

	public Symbol(String src) throws IOException {
		super();

		bitmap = BitmapUtils.createBitmap(src);
	}

	@Override
	public void destroy() {
		bitmap.recycle();
	}

	@Override
	public void renderNode(IRenderCallback renderCallback, Tag[] tags) {
		renderCallback.renderPointOfInterestSymbol(bitmap);
	}

	@Override
	public void renderWay(IRenderCallback renderCallback, Tag[] tags) {
		renderCallback.renderAreaSymbol(bitmap);
	}
}