[Yanel-commits] rev 60871 - public/yanel/trunk/src/contributions/resources/image/src/java/org/wyona/yanel/impl/resources/image

[michi at wyona.com]

Author: michi
Date: 2011-09-27 11:33:53 +0200 (Tue, 27 Sep 2011)
New Revision: 60871

Added:
   public/yanel/trunk/src/contributions/resources/image/src/java/org/wyona/yanel/impl/resources/image/MobileImageResource.java
Log:
resource added to scale down an image if a mobile view is requested, but only if width is above a certain level

Added: public/yanel/trunk/src/contributions/resources/image/src/java/org/wyona/yanel/impl/resources/image/MobileImageResource.java
===================================================================
--- public/yanel/trunk/src/contributions/resources/image/src/java/org/wyona/yanel/impl/resources/image/MobileImageResource.java	                        (rev 0)
+++ public/yanel/trunk/src/contributions/resources/image/src/java/org/wyona/yanel/impl/resources/image/MobileImageResource.java	2011-09-27 09:33:53 UTC (rev 60871)
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2011 Wyona
+ */
+
+package org.wyona.yanel.impl.resources.image;
+
+import org.wyona.yanel.core.Resource;
+import org.wyona.yanel.core.api.attributes.ViewableV2;
+import org.wyona.yanel.core.attributes.viewable.View;
+import org.wyona.yanel.core.attributes.viewable.ViewDescriptor;
+
+import org.wyona.yarep.core.Node;
+
+import org.apache.log4j.Logger;
+
+import java.awt.image.BufferedImage;
+import java.awt.image.AffineTransformOp;
+import java.awt.geom.AffineTransform;
+import javax.imageio.ImageIO;
+
+/**
+ * Resource to scale (down) images if mobile view is requested (but only jpeg so far)
+ */
+public class MobileImageResource extends ImageResource  {
+    
+    private static Logger log = Logger.getLogger(MobileImageResource.class);
+
+    /**
+     * @see org.wyona.yanel.core.api.attributes.ViewableV2#getView(String)
+     */
+    @Override
+    public View getView(String viewId) throws Exception {
+        if (isMobileView()) {
+            BufferedImage sourceImg = ImageIO.read(getRealm().getRepository().getNode(getPath()).getInputStream());
+            int sourceWidth = sourceImg.getWidth();
+            if (sourceWidth > 300) {
+                log.warn("DEBUG: Scale image for mobile view...");
+                return super.getView(viewId);
+            } else {
+                log.warn("DEBUG: Get original image, because original image width <= 300 (" + sourceWidth + ")");
+                View view = new View();
+                view.setInputStream(getRealm().getRepository().getNode(getPath()).getInputStream());
+                view.setMimeType("image/jpeg");
+                return view;
+            }
+        } else {
+            log.warn("DEBUG: Get original image, because mobile view not requested...");
+            View view = new View();
+            view.setInputStream(getRealm().getRepository().getNode(getPath()).getInputStream());
+            view.setMimeType("image/jpeg");
+            return view;
+        }
+    }
+
+    /**
+     * Check whether mobile view is requested. Please overwrite this method in case there exist other rules than just being a mobile device.
+     */
+    private boolean isMobileView() {
+        String VIEW_ID_PARAM_NAME = "yanel.resource.viewid";
+        try {
+/*
+            String isMobileViewParamValue = getResourceConfigProperty("is-mobile-view");
+            if (isMobileViewParamValue != null && isMobileViewParamValue.equals("false")) { // INFO: In some cases one wants to disable the mobile view completely (including mobile CSS, if applicable)
+                return false;
+            }
+*/
+
+            String viewIdFromSession = (String) request.getSession(true).getAttribute(VIEW_ID_PARAM_NAME);
+            if (viewIdFromSession != null && !viewIdFromSession.equals("mobile")) {
+                log.warn("It seems like the view id is set inside session, but not set to mobile: " + viewIdFromSession);
+                return false;
+            }
+        } catch(Exception e) {
+            log.error(e, e);
+        }
+        return isMobileDevice();
+    }
+
+    /**
+     * Check whether user agent is a mobile device
+     */
+    protected boolean isMobileDevice() {
+        javax.servlet.http.HttpSession session = getEnvironment().getRequest().getSession(true);
+        if (session != null) {
+            String mobileDevice = (String) session.getAttribute("yanel.mobile");
+            //TODO: String mobileDevice = (String) getEnvironment().getRequest().getSession(true).getAttribute(org.wyona.yanel.servlet.YanelServlet.MOBILE_KEY);
+            if (mobileDevice != null && !mobileDevice.equals("false")) {
+                return true;
+            } else {
+                return false;
+            }
+        } else {
+            log.warn("No HTTP session available (maybe because Yanel is used via the command line or some custom junit tests do not provide session handling)!");
+            return false;
+        }
+    }
+}