Add weather icons for offline use

src/main/java/edu/project/components/GeoMap.java

@@ -4,7 +4,6 @@
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseWheelEvent;
-import java.io.IOException;
 import java.util.HashSet;
 
 import javax.swing.event.MouseInputListener;
@@ -63,12 +62,7 @@ public void mouseClicked(MouseEvent e) {
 		DefaultWaypoint waypoint = new DefaultWaypoint();
 		waypoints.add(waypoint);
 		waypointPainter.setWaypoints(waypoints);
-
-		try {
-			waypointPainter.setRenderer(new GeoMapMarker());
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
+		waypointPainter.setRenderer(new GeoMapMarker());
 
 		// Display overlay marker
 		setOverlayPainter(waypointPainter);

src/main/java/edu/project/components/GeoMapMarker.java

@@ -3,20 +3,23 @@
 import java.awt.Graphics2D;
 import java.awt.geom.Point2D;
 import java.awt.image.BufferedImage;
-import java.io.IOException;
 import javax.imageio.ImageIO;
 import org.jxmapviewer.JXMapViewer;
 import org.jxmapviewer.viewer.DefaultWaypoint;
 import org.jxmapviewer.viewer.WaypointRenderer;
 
 public class GeoMapMarker implements WaypointRenderer<DefaultWaypoint> {
 
-	private BufferedImage markerIconImage;
-	private BufferedImage markerShadowImage;
+	private static BufferedImage markerIconImage;
+	private static BufferedImage markerShadowImage;
 
-	public GeoMapMarker() throws IOException {
-		markerIconImage = ImageIO.read(getClass().getResource("/images/marker-icon.png"));
-		markerShadowImage = ImageIO.read(getClass().getResource("/images/marker-shadow.png"));
+	static {
+		try {
+			markerIconImage = ImageIO.read(GeoMapMarker.class.getResource("/images/marker-icon.png"));
+			markerShadowImage = ImageIO.read(GeoMapMarker.class.getResource("/images/marker-shadow.png"));
+		} catch (Exception exception) {
+			exception.printStackTrace();
+		}
 	}
 
 	@Override

src/main/java/edu/project/components/TimeForecast.java

@@ -3,22 +3,31 @@
 import edu.project.Context;
 import edu.project.api.WeatherForecast5Data;
 
-import javax.imageio.ImageIO;
-import javax.swing.*;
-
 import com.formdev.flatlaf.FlatClientProperties;
 
-import java.awt.*;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.GridLayout;
+import java.awt.RenderingHints;
 import java.awt.geom.RoundRectangle2D;
 import java.awt.image.BufferedImage;
-import java.io.IOException;
-import java.net.URL;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
 
+import javax.swing.BorderFactory;
+import javax.swing.ImageIcon;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSeparator;
+import javax.swing.SwingConstants;
+
 public class TimeForecast extends JPanel {
 
 	private static final DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("h a")
@@ -119,16 +128,7 @@ private void addForecastPanels() {
 	}
 
 	private JPanel createIconPanel(String iconId) {
-		String iconUrl = "https://openweathermap.org/img/wn/" + iconId + "@2x.png";
-		BufferedImage image = null;
-
-		try {
-			URL url = new URL(iconUrl);
-			image = ImageIO.read(url);
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-
+		BufferedImage image = WeatherIcons.getIcon(iconId);
 		ImageIcon icon = new ImageIcon(image);
 
 		JPanel iconPanel = new JPanel() {

src/main/java/edu/project/components/WeatherForecastPanel.java

@@ -3,16 +3,25 @@
 import edu.project.Context;
 import edu.project.api.WeatherForecast5Data;
 
-import javax.imageio.ImageIO;
-import javax.swing.*;
+import javax.swing.BorderFactory;
+import javax.swing.ImageIcon;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JSeparator;
+import javax.swing.SwingConstants;
 
 import com.formdev.flatlaf.FlatClientProperties;
 
-import java.awt.*;
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.GridLayout;
+import java.awt.RenderingHints;
 import java.awt.geom.RoundRectangle2D;
 import java.awt.image.BufferedImage;
-import java.io.IOException;
-import java.net.URL;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 import java.util.List;
@@ -120,17 +129,7 @@ private void updateForecast(WeatherForecast5Data forecastData) {
 	}
 
 	private JPanel createiconPanel(String iconId) {
-		// Base URL for weather icons
-		String iconUrl = "http://openweathermap.org/img/wn/" + iconId + "@2x.png";
-		BufferedImage image = null;
-
-		try {
-			URL url = new URL(iconUrl);
-			image = ImageIO.read(url);
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
-
+		BufferedImage image = WeatherIcons.getIcon(iconId);
 		ImageIcon icon = new ImageIcon(image);
 
 		JPanel iconPanel = new JPanel() {

src/main/java/edu/project/components/WeatherIcons.java

@@ -0,0 +1,53 @@
+package edu.project.components;
+
+import java.awt.image.BufferedImage;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.imageio.ImageIO;
+
+/**
+ * An image provider for OpenWeatherMap's icons
+ * 
+ * @see https://openweathermap.org/weather-conditions
+ */
+public class WeatherIcons {
+
+	/**
+	 * Key-Value cache for the icons
+	 */
+	private static Map<String, BufferedImage> icons = new HashMap<>();
+
+	/**
+	 * List of icon IDs
+	 */
+	private static String[] iconIds = new String[] {
+			// Day-time icons
+			"01d", "02d", "03d", "04d", "09d", "10d", "11d", "13d", "50d",
+
+			// Night-time icons
+			"01n", "02n", "03n", "04n", "09n", "10n", "11n", "13n", "50n"
+	};
+
+	static {
+		// Load resource image for each icon ID
+		for (String id : iconIds) {
+			try {
+				String path = "/images/weather/" + id + "@2x.png";
+				URL url = WeatherIcons.class.getResource(path);
+				BufferedImage image = ImageIO.read(url);
+				icons.put(id, image);
+			} catch (Exception exception) {
+				exception.printStackTrace();
+			}
+		}
+	}
+
+	/**
+	 * Gets the corresponding {@code BufferedImage} for the {@code iconId}
+	 */
+	public static BufferedImage getIcon(String iconId) {
+		return icons.get(iconId);
+	}
+}