public Image execute()

in src/main/java/org/apache/xmlgraphics/image/loader/pipeline/ImageProviderPipeline.java [115:203]
73 lines of code
23 McCabe index (conditional complexity)

    public Image execute(ImageInfo info, Image originalImage,
            Map<String, Object> hints, ImageSessionContext context) throws ImageException, IOException {
        if (hints == null) {
            hints = Collections.EMPTY_MAP;
        }
        long start = System.currentTimeMillis();
        Image img = null;

        //Remember the last image in the pipeline that is cacheable and cache that.
        Image lastCacheableImage = null;

        int converterCount = converters.size();
        int startingPoint = 0;
        if (cache != null) {
            for (int i = converterCount - 1; i >= 0; i--) {
                ImageConverter converter = getConverter(i);
                ImageFlavor flavor = converter.getTargetFlavor();
                img = cache.getImage(info, flavor);
                if (img != null) {
                    startingPoint = i + 1;
                    break;
                }
            }

            if (img == null && loader != null) {
                //try target flavor of loader from cache
                ImageFlavor flavor = loader.getTargetFlavor();
                img = cache.getImage(info, flavor);
            }
        }
        if (img == null && originalImage != null) {
            img = originalImage;
        }

        boolean entirelyInCache = true;
        long duration;
        if (img == null && loader != null) {
            //Load image
            img = loader.loadImage(info, hints, context);
            if (log.isTraceEnabled()) {
                duration = System.currentTimeMillis() - start;
                log.trace("Image loading using " + loader + " took " + duration + " ms.");
            }

            //Caching
            entirelyInCache = false;
            if (img.isCacheable()) {
                lastCacheableImage = img;
            }
        }
        if (img == null) {
            throw new ImageException(
                    "Pipeline fails. No ImageLoader and no original Image available.");
        }

        if (converterCount > 0) {
            for (int i = startingPoint; i < converterCount; i++) {
                ImageConverter converter = getConverter(i);
                start = System.currentTimeMillis();
                img = converter.convert(img, hints);
                if (log.isTraceEnabled()) {
                    duration = System.currentTimeMillis() - start;
                    log.trace("Image conversion using " + converter + " took " + duration + " ms.");
                }

                //Caching
                entirelyInCache = false;
                if (img.isCacheable()) {
                    lastCacheableImage = img;
                }
            }
        }

        //Note: Currently we just cache the end result of the pipeline, not all intermediate
        //results as it is expected that the cache hit ration would be rather small.
        if (cache != null && !entirelyInCache) {
            if (lastCacheableImage == null) {
                //Try to make the Image cacheable
                lastCacheableImage = forceCaching(img);
            }
            if (lastCacheableImage != null) {
                if (log.isTraceEnabled()) {
                    log.trace("Caching image: " + lastCacheableImage);
                }
                cache.putImage(lastCacheableImage);
            }
        }
        return img;
    }