net.avh4.util.imagerender.ImageRenderer Maven / Gradle / Ivy

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package net.avh4.util.imagerender;

import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;

public class ImageRenderer {
    private static final ServiceLoader rendererLoader = ServiceLoader
            .load(Renderer.class);

    public static BufferedImage getImage(final Object item) {

        if (item == null) {
            throw new UnrenderableException(item, getRenderers());
        }

        if (item instanceof BufferedImage) {
            return (BufferedImage) item;
        }

        for (final Renderer r : rendererLoader) {
            final BufferedImage rendering = r.getImage(item);
            if (rendering != null) {
                return rendering;
            }
        }

        throw new UnrenderableException(item, getRenderers());
    }

    public static List getRenderers() {
        List renderers = new ArrayList();
        for (Renderer renderer : rendererLoader) {
            renderers.add(renderer);
        }
        return renderers;
    }
}