Examples of org.apache.wicket.Resource

org.apache.wicket.Resource
A Resource is something that implements IResourceListener and provides a getResourceStream() method which returns the raw IResourceStream to be rendered back to the client browser.
Resources themselves do not currently have URLs. Instead, they are referred to by components that have URLs.
Resources can be shared throughout an application by adding them to Application with addResource(Class scope, String name) or addResource(String name). A resource added in such a way is a named resource and is accessible throughout the application via Application.getResource(Class scope, String name) or Application.getResource(String name). The ResourceReference class enables easy access to such resources in a way that is light on clusters.
While resources can be shared between components, it is important to emphasize that components cannot be shared among containers. For example, you can create a button image resource with new DefaultButtonImageResource(...) and store that in the Application with addResource(). You can then assign that logical resource via ResourceReference to several ImageButton components. While the button image resource can be shared between components like this, the ImageButton components in this example are like all other components in Wicket and cannot be shared. @author Jonathan Locke @author Johan Compagner @author Gili Tzabari @author Igor Vaynberg

  }


  public void testInvalidPackageResource() throws Exception
  {
    final SharedResources sharedResources = Application.get().getSharedResources();
    Resource invalidResource = new PackageResource(PackageResourceTest.class, "packaged3.txt", Locale.ENGLISH, null); 
    assertNotNull("resource packaged3.txt SHOULD be available as a packaged resource even if it doesn't exist",
        invalidResource);


    try
    {
      invalidResource.getResourceStream();
      fail("Should have raised an AbortException");
    }
    catch (AbortException e)
    {
    }

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  {
    final String pathInfo = getRelativePath(servletRequest);


    if (pathInfo.startsWith(WebRequestCodingStrategy.RESOURCES_PATH_PREFIX))
    {
      Resource resource = null;
      WebRequestCycle requestCycle = null;


      boolean externalCall = !Application.exists();
      try
      {
        // if called externally (i.e. WicketServlet) we need to set the thread local here
        // AND clean it up at the end of the request
        if (externalCall)
        {
          Application.set(webApplication);
        }


        final String resourceReferenceKey = WicketURLDecoder.PATH_INSTANCE.decode(pathInfo.substring(WebRequestCodingStrategy.RESOURCES_PATH_PREFIX.length()));




        // Try to find shared resource
        resource = webApplication.getSharedResources().get(resourceReferenceKey);


        // If resource found and it is cacheable
        if ((resource != null) && resource.isCacheable())
        {
          // first check the char encoding for getting the parameters
          checkCharacterEncoding(servletRequest);


          final WebRequest request = webApplication.newWebRequest(servletRequest);
          WebResponse response = new WebResponse();
          // create a request cycle if not already there.
          if (RequestCycle.get() == null)
          {
            requestCycle = (WebRequestCycle)webApplication.newRequestCycle(request,
              response);
          }
          // make the session available.
          Session.findOrCreate(request, response);




          // decode the parameters so that shared resource params are also decoded
          // a request cycle is then needed. (see above)
          RequestParameters rp = RequestCycle.get()
            .getProcessor()
            .getRequestCodingStrategy()
            .decode(request);
          // Set parameters from servlet request
          resource.setParameters(rp.getParameters());


          // Get resource stream
          IResourceStream stream = resource.getResourceStream();


          // Get last modified time from stream
          Time time = stream.lastModifiedTime();


          try
          {
            stream.close();
          }
          catch (IOException e)
          {
            // ignore
          }


          return time != null ? time.getMilliseconds() : -1;
        }
      }
      catch (AbortException e)
      {
        return -1;
      }
      finally
      {
        if (resource != null)
        {
          resource.setParameters(null);
        }
        if (externalCall)
        {
          // Clean up thread local application if this was an external call
          // (if not, doFilter will clean it up)

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    if (pathInfo.startsWith(WebRequestCodingStrategy.RESOURCES_PATH_PREFIX))
    {


      final String resourceReferenceKey = pathInfo.substring(WebRequestCodingStrategy.RESOURCES_PATH_PREFIX.length());


      Resource resource = null;
      WebRequestCycle requestCycle = null;


      boolean externalCall = !Application.exists();
      try
      {
        // if called externally (i.e. WicketServlet) we need to set the thread local here
        // AND clean it up at the end of the request
        if (externalCall)
        {
          Application.set(webApplication);
        }


        // Try to find shared resource
        resource = webApplication.getSharedResources().get(resourceReferenceKey);


        // If resource found and it is cacheable
        if ((resource != null) && resource.isCacheable())
        {
          // first check the char encoding for getting the parameters
          checkCharacterEncoding(servletRequest);


          final WebRequest request = webApplication.newWebRequest(servletRequest);
          WebResponse response = new WebResponse();
          // create a request cycle if not already there.
          if (RequestCycle.get() == null)
          {
            requestCycle = (WebRequestCycle)webApplication.newRequestCycle(request,
              response);
          }
          // make the session available.
          Session.findOrCreate(request, response);




          // decode the parameters so that shared resource params are also decoded
          // a request cycle is then needed. (see above)
          RequestParameters rp = RequestCycle.get()
            .getProcessor()
            .getRequestCodingStrategy()
            .decode(request);
          // Set parameters from servlet request
          resource.setParameters(rp.getParameters());


          // Get resource stream
          IResourceStream stream = resource.getResourceStream();


          // Get last modified time from stream
          Time time = stream.lastModifiedTime();


          try
          {
            stream.close();
          }
          catch (IOException e)
          {
            // ignore
          }


          return time != null ? time.getMilliseconds() : -1;
        }
      }
      catch (AbortException e)
      {
        return -1;
      }
      finally
      {
        if (resource != null)
        {
          resource.setParameters(null);
        }
        if (externalCall)
        {
          // Clean up thread local application if this was an external call
          // (if not, doFilter will clean it up)

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Related Classes of org.apache.wicket.Resource

org.apache.wicket.extensions.util.resource.TextTemplateSharedResourceFactory

org.apache.wicket.markup.html.form.ImageButton

org.apache.wicket.markup.html.image.Image

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

org.apache.wicket.markup.html.PackageResourceTest

org.apache.wicket.ng.request.cycle.RequestCycle

org.apache.wicket.protocol.http.WebResponse

org.apache.wicket.protocol.http.WicketFilter

org.apache.wicket.request.target.resource.ResourceStreamRequestHandler

org.apache.wicket.request.target.resource.ResourceStreamRequestTarget

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