apps.brucelefebvre.kitchen_002dsink.components.app_002dpage.img_png.java Source code

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Here is the source code for apps.brucelefebvre.kitchen_002dsink.components.app_002dpage.img_png.java

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/*
 * Copyright 1997-2008 Day Management AG
 * Barfuesserplatz 6, 4001 Basel, Switzerland
 * All Rights Reserved.
 *
 * This software is the confidential and proprietary information of
 * Day Management AG, ("Confidential Information"). You shall not
 * disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into
 * with Day.
 */

package apps.brucelefebvre.kitchen_002dsink.components.app_002dpage;

import java.io.IOException;
import java.io.InputStream;

import javax.jcr.RepositoryException;
import javax.jcr.Property;
import javax.servlet.http.HttpServletResponse;

import com.day.cq.commons.ImageResource;
import com.day.cq.wcm.api.WCMMode;
import com.day.cq.wcm.foundation.Image;
import com.day.cq.wcm.commons.RequestHelper;
import com.day.cq.wcm.commons.WCMUtils;
import com.day.cq.wcm.commons.AbstractImageServlet;
import com.day.cq.wcm.api.Page;
import com.day.cq.commons.SlingRepositoryException;
import com.day.image.Layer;
import org.apache.commons.io.IOUtils;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ValueMap;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;

/**
 * Renders an image
 */
public class img_png extends AbstractImageServlet {

    protected Layer createLayer(ImageContext c) throws RepositoryException, IOException {
        // don't create the later yet. handle everything later
        return null;
    }

    /**
     * {@inheritDoc}
     *
     * Override default ImageResource creation to support assets
     */
    @Override
    protected ImageResource createImageResource(Resource resource) {
        return new Image(resource);
    }

    protected void writeLayer(SlingHttpServletRequest req, SlingHttpServletResponse resp, ImageContext c,
            Layer layer) throws IOException, RepositoryException {

        Image image = new Image(c.resource, "image");
        if (!image.hasContent()) {
            resp.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        }

        // get style and set constraints
        image.loadStyleData(c.style);

        // get pure layer
        layer = image.getLayer(false, false, false);
        boolean modified = false;

        if (layer != null) {
            // crop
            modified = image.crop(layer) != null;

            // resize
            modified |= image.resize(layer) != null;

            // rotate
            modified |= image.rotate(layer) != null;

            // check diff (needed when return null for createLayer() )
            modified |= applyDiff(layer, c);
        }

        // don't cache images on authoring instances
        // Cache-Control: no-cache allows caching (e.g. in the browser cache) but
        // will force revalidation using If-Modified-Since or If-None-Match every time,
        // avoiding aggressive browser caching
        if (!WCMMode.DISABLED.equals(WCMMode.fromRequest(req))) {
            resp.setHeader("Cache-Control", "no-cache");
        }

        if (modified) {
            resp.setContentType("image/png");
            layer.write("image/png", 1.0, resp.getOutputStream());
        } else {
            // do not re-encode layer, just spool
            Property data = image.getData();
            InputStream in = data.getStream();
            resp.setContentLength((int) data.getLength());
            resp.setContentType(image.getMimeType());
            IOUtils.copy(in, resp.getOutputStream());
            in.close();
        }
        resp.flushBuffer();
    }
}