Examples of org.apache.wicket.markup.html.image.resource.DynamicImageResource

Package org.apache.wicket.markup.html.image.resource

Examples of org.apache.wicket.markup.html.image.resource.DynamicImageResource

org.apache.wicket.markup.html.image.resource.DynamicImageResource
An ImageResource subclass for dynamic images (images created programmatically). Subclasses override getImageData() to provide the image data to send back to the user. A given subclass may decide how to produce this data and whether/how to buffer it.
The RenderedDynamicImageResource subclass is designed for images that can be regenerated when the component is deserialized (the image data is transient). A good example of a RenderedDynamicImageResource is the DefaultButtonImageResource class, which can regenerate a given button image at any time. This makes it very lightweight when clustered. The BufferedDynamicImageResource class, on the other hand, is designed for images that cannot be regenerated on demand. It buffers its image data in a non-transient way, which means that the entire image will be serialized and copied when the resource is replicated in a cluster!
The helper method toImageData(BufferedImage) is provided so that subclasses can easily turn a BufferedImage into a suitable return value when implementing getImageData().
The format of the image (and therefore the resource's extension) can be specified with setFormat(String). The default format is "PNG" because JPEG is lossy and makes generated images look bad and GIF has patent issues. @author Jonathan Locke @author Gili Tzabari @author Johan Compagner

  {
    application = new DummyWebApplication();
    WicketFilter filter = new WicketFilter();
    filter.init(new FilterTestingConfig());
    Application.set(application);
    DynamicImageResource resource = new DynamicImageResource()
    {
      private static final long serialVersionUID = 1L;


      protected byte[] getImageData()
      {
        throw new UnsupportedOperationException("Not implemented");
      }
    };
    resource.setCacheable(true);
    application.getSharedResources().add("foo.gif", resource);
    MockHttpServletRequest request = new MockHttpServletRequest(application, null, null);
    request.setURL(request.getContextPath() + "/app/" + "resources/" +
      Application.class.getName() + "/foo.gif");
    setIfModifiedSinceToNextWeek(request);

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  {
    application = new DummyWebApplication();
    WicketFilter filter = new WicketFilter();
    filter.init(new FilterTestingConfig());
    Application.set(application);
    DynamicImageResource resource = new DynamicImageResource()
    {
      private static final long serialVersionUID = 1L;


      @Override
      protected byte[] getImageData()
      {
        throw new UnsupportedOperationException("Not implemented");
      }
    };
    resource.setCacheable(true);
    application.getSharedResources().add("foo.gif", resource);
    MockHttpServletRequest request = new MockHttpServletRequest(application, null, null);
    request.setURL(request.getContextPath() + "/app/" + "resources/" +
      Application.class.getName() + "/foo.gif");
    setIfModifiedSinceToNextWeek(request);

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    private static final long serialVersionUID = 1L;


    public Crop(String id, MarkupContainer markupProvider, final File file) {
      super(id, "crop", markupProvider);
      setOutputMarkupId(true);
      NonCachingImage image = new NonCachingImage("img", new DynamicImageResource() {


        private static final long serialVersionUID = 1L;


        @Override
        protected byte[] getImageData() {

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