DataServiceImpl.java

/*
 * Copyright 2006-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jrecruiter.service.impl;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.math.BigDecimal;
import java.net.URI;
import java.net.URLConnection;
import java.net.UnknownHostException;
import java.util.Map;

import javax.imageio.ImageIO;

import org.jrecruiter.common.ApiKeysHolder;
import org.jrecruiter.common.CollectionUtils;
import org.jrecruiter.common.GoogleMapsUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author Gunnar Hillert
 */
@Service("dataService")
@Transactional
public class DataServiceImpl implements org.jrecruiter.service.DataService {

	/**
	 * Logger Declaration.
	 */
	private final static Logger LOGGER = LoggerFactory.getLogger(DataServiceImpl.class);

	private @Autowired ApiKeysHolder apiKeysHolder;

	/** {@inheritDoc} */
	@Transactional(readOnly = true, propagation=Propagation.SUPPORTS)
	public Image getGoogleMapImage(final BigDecimal latitude,
								   final BigDecimal longitude,
								   final Integer zoomLevel) {

		if (longitude == null) {
			throw new IllegalArgumentException("Longitude cannot be null.");
		}

		if (latitude == null) {
			throw new IllegalArgumentException("Latitude cannot be null.");
		}

		if (zoomLevel == null) {
			throw new IllegalArgumentException("ZoomLevel cannot be null.");
		}

		final URI url = GoogleMapsUtils.buildGoogleMapsStaticUrl(latitude, longitude, zoomLevel);


		BufferedImage img;
		try {
			URLConnection conn = url.toURL().openConnection ();
			img = ImageIO.read(conn.getInputStream());
		} catch (UnknownHostException e) {
			LOGGER.error("Google static MAPS web service is not reachable (UnknownHostException).", e );
			img = new BufferedImage(GoogleMapsUtils.defaultWidth, 100, BufferedImage.TYPE_INT_RGB);

			final Graphics2D graphics = img.createGraphics();

			final Map<Object, Object> renderingHints = CollectionUtils.getHashMap();
			renderingHints.put(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
			graphics.addRenderingHints(renderingHints);
			graphics.setBackground(Color.WHITE);
			graphics.setColor(Color.GRAY);
			graphics.clearRect(0, 0, GoogleMapsUtils.defaultWidth, 100);

			graphics.drawString("Not Available", 30, 30);

		} catch (IOException e) {
			throw new IllegalStateException(e);
		}

		return img;
	}


}