ImageFactory.java

package games.strategy.triplea.image;

import java.awt.Image;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import games.strategy.debug.ClientLogger;
import games.strategy.triplea.ResourceLoader;

public class ImageFactory {
  private final Map<String, Image> m_images = new HashMap<>();
  private ResourceLoader m_resourceLoader;

  public void setResourceLoader(final ResourceLoader loader) {
    m_resourceLoader = loader;
    m_images.clear();
  }

  protected Image getImage(final String key1, final String key2, final boolean throwIfNotFound) {
    final Image i1 = getImage(key1, false);
    if (i1 != null) {
      return i1;
    }
    return getImage(key2, throwIfNotFound);
  }

  protected Image getImage(final String key, final boolean throwIfNotFound) {
    if (!m_images.containsKey(key)) {
      final URL url = m_resourceLoader.getResource(key);
      if (url == null && throwIfNotFound) {
        throw new IllegalStateException("Image Not Found:" + key);
      } else if (url == null) {
        m_images.put(key, null);
        return null;
      }
      Image image;
      try {
        image = ImageIO.read(url);
      } catch (final IOException e) {
        ClientLogger.logQuietly(e);
        throw new IllegalStateException(e.getMessage());
      }
      m_images.put(key, image);
    }
    return m_images.get(key);
  }
}