ImageProvider.java

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package complete.orgchart;

import javafx.scene.image.Image;

import java.util.HashMap;
import java.util.Map;

/**
 * Cache for the images of the persons so they get loaded only once.
 * Provides a valueOf(String) method that makes the provider accessible
 * in FXML via
 * <p>
 *   <code><xmp><ImageProvider fx:value="man1"/></xmp></code>
 * </p>
 */
public class ImageProvider {

  private static ImageProvider INSTANCE = new ImageProvider();

  private static Map<String, Image> images = new HashMap<>();

  private static Image WOMAN1 = new Image(INSTANCE.getClass().getResourceAsStream("resources/woman1.png"));
  private static Image WOMAN1_16 = new Image(INSTANCE.getClass().getResourceAsStream("resources/usericon_female1_16.png"));
  private static Image WOMAN2 = new Image(INSTANCE.getClass().getResourceAsStream("resources/woman2.png"));
  private static Image WOMAN3 = new Image(INSTANCE.getClass().getResourceAsStream("resources/woman3.png"));
  private static Image MAN1 = new Image(INSTANCE.getClass().getResourceAsStream("resources/man1.png"));
  private static Image MAN2 = new Image(INSTANCE.getClass().getResourceAsStream("resources/man2.png"));
  private static Image MAN3 = new Image(INSTANCE.getClass().getResourceAsStream("resources/man3.png"));

  static {
    images.put("woman1", WOMAN1);
    images.put("woman2", WOMAN2);
    images.put("woman3", WOMAN3);
    images.put("woman1_16", WOMAN1_16);
    images.put("man1", MAN1);
    images.put("man2", MAN2);
    images.put("man3", MAN3);
  }

  public static Image valueOf(String name){
    Image img = images.get(name);
    if (img == null){
      throw new IllegalArgumentException("Image not found: "+name);
    }
    return img;
  }
}