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 respond(RequestCycle requestCycle)
  {
    Application application = requestCycle.getApplication();
    SharedResources sharedResources = application.getSharedResources();
    final String resourceKey = getRequestParameters().getResourceKey();
    Resource resource = sharedResources.get(resourceKey);


    // try to lazily register
    if (resource == null)
    {
      int ix = resourceKey.indexOf('/');
      if (ix != -1)
      {
        String className = resourceKey.substring(0, ix);
        IClassResolver resolver = application.getApplicationSettings().getClassResolver();
        Class<?> scope = null;
        try
        {
          // First try to match mounted resources.
          scope = Application.get().getSharedResources().getAliasClass(className);


          // If that fails, resolve it as a fully qualified class
          // name.
          if (scope == null)
          {
            scope = resolver.resolveClass(className);
          }
          final CharSequence escapeString = application.getResourceSettings()
            .getParentFolderPlaceholder();
          // get path component of resource key, replace '..' with escape sequence to
          // prevent crippled urls in browser
          String path = resourceKey.substring(ix + 1).replace(escapeString, "..");


          if (PackageResource.exists(scope, path, null, null))
          {
            PackageResource packageResource = PackageResource.get(scope, path);
            if (sharedResources.get(resourceKey) == null)
            {
              sharedResources.add(scope, path, null, null, packageResource);
            }
            resource = packageResource;
          }
        }
        catch (Exception e)
        {
          // besides logging, ignore exception; after this an error
          // will be returned that the resource could not be retrieved
          log.error("unable to lazily register shared resource " + resourceKey, e);
        }
      }
    }


    // if resource is still null, it doesn't exist
    if (resource == null)
    {
      Response response = requestCycle.getResponse();
      if (response instanceof WebResponse)
      {
        ((WebResponse)response).getHttpServletResponse().setStatus(
          HttpServletResponse.SC_NOT_FOUND);
        log.error("shared resource " + resourceKey + " not found");
        return;
      }
      else
      {
        throw new WicketRuntimeException("shared resource " + resourceKey + " not found");
      }
    }


    // set request parameters if there are any
    if (requestParameters != null)
    {
      resource.setParameters(requestParameters.getParameters());
    }


    // let the resource handle the request
    resource.onResourceRequested();
  }

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        if (application.getSharedResources().get(Application.class, imageReferenceName,
          locale, style, true) == null)
        {
          // Resource not available yet, so create it with factory and
          // share via Application
          final Resource imageResource = getResourceFactory(application, factoryName).newResource(
            specification, locale, style);
          application.getSharedResources().add(Application.class, imageReferenceName,
            locale, style, imageResource);
        }

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


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


      Resource resource = 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())
        {


          final WebRequest request = webApplication.newWebRequest(servletRequest);
          // make the session available.
          Session.findOrCreate(request, new WebResponse());




          // Set parameters from servlet request
          resource.setParameters(request.getParameterMap());


          // 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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  public void respond(RequestCycle requestCycle)
  {
    Application application = requestCycle.getApplication();
    SharedResources sharedResources = application.getSharedResources();
    final String resourceKey = getRequestParameters().getResourceKey();
    Resource resource = sharedResources.get(resourceKey);


    // try to lazily register
    if (resource == null)
    {
      int ix = resourceKey.indexOf('/');
      if (ix != -1)
      {
        String className = resourceKey.substring(0, ix);
        IClassResolver resolver = application.getApplicationSettings().getClassResolver();
        Class scope = null;
        try
        {
          // First try to match mounted resources.
          scope = Application.get().getSharedResources().getAliasClass(className);


          // If that fails, resolve it as a fully qualified class
          // name.
          if (scope == null)
          {
            scope = resolver.resolveClass(className);
          }
          String path = resourceKey.substring(ix + 1);


          PackageResource packageResource = PackageResource.get(scope, path);
          if (sharedResources.get(resourceKey) == null)
          {
            sharedResources.add(scope, path, null, null, packageResource);
          }
          resource = packageResource;
        }
        catch (Exception e)
        {
          // besides logging, ignore exception; after this an error
          // will be returned that the resource could not be retrieved
          log.error("unable to lazily register shared resource " + resourceKey, e);
        }
      }
    }


    // if resource is still null, it doesn't exist
    if (resource == null)
    {
      Response response = requestCycle.getResponse();
      if (response instanceof WebResponse)
      {
        ((WebResponse)response).getHttpServletResponse().setStatus(
          HttpServletResponse.SC_NOT_FOUND);
        log.error("shared resource " + resourceKey + " not found");
        return;
      }
      else
      {
        throw new WicketRuntimeException("shared resource " + resourceKey + " not found");
      }
    }


    // set request parameters if there are any
    if (requestParameters != null)
    {
      resource.setParameters(requestParameters.getParameters());
    }


    // let the resource handle the request
    resource.onResourceRequested();
  }

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  public ResourceReference resourceReference(final Map<String, Object> variables)
  {
    final String uniqueName = sharedResourceName(variables);
    final String templateValue = template.asString(variables);
    final SharedResources sharedResources = Application.get().getSharedResources();
    final Resource resource = sharedResources.get(uniqueName);
    if (resource == null)
    {
      final Resource newResource = new Resource()
      {
        private static final long serialVersionUID = 1L;


        /**
         * @see org.apache.wicket.Resource#getResourceStream()

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


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


      // If resource found and it is cacheable
      if ((resource != null) && resource.isCacheable())
      {
        try
        {
          Application.set(webApplication);


          final WebRequest webRequest = webApplication.newWebRequest(request);


          // Set parameters from servlet request
          resource.setParameters(webRequest.getParameterMap());


          // 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
        {
          resource.setParameters(null);
          Application.unset();
        }
      }
    }
    return -1;

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   */
  protected void onComponentTag(final ComponentTag tag)
  {
    checkComponentTag(tag, "img");
    super.onComponentTag(tag);
    final Resource resource = getImageResource();
    if (resource != null)
    {
      localizedImageResource.setResource(resource);
    }
    final ResourceReference resourceReference = getImageResourceReference();

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        if (application.getSharedResources().get(Application.class, imageReferenceName,
            locale, style, true) == null)
        {
          // Resource not available yet, so create it with factory and
          // share via Application
          final Resource imageResource = getResourceFactory(application, factoryName)
              .newResource(specification, locale, style);
          application.getSharedResources().add(Application.class, imageReferenceName,
              locale, style, imageResource);
        }

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


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


      Resource resource = 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);
          // make the session available.
          Session.findOrCreate(request, new WebResponse());




          // Set parameters from servlet request
          resource.setParameters(request.getParameterMap());


          // 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 (application.getSharedResources().get(Application.class, imageReferenceName,
          locale, style, true) == null)
        {
          // Resource not available yet, so create it with factory and
          // share via Application
          final Resource imageResource = getResourceFactory(application, factoryName).newResource(
            specification, locale, style);
          application.getSharedResources().add(Application.class, imageReferenceName,
            locale, style, imageResource);
        }

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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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