Examples of org.apache.wicket.Application

org.apache.wicket.Application
Base class for all Wicket applications. To create a Wicket application, you generally should not directly subclass this class. Instead, you will want to subclass some subclass of Application, like WebApplication, which is appropriate for the protocol and markup type you are working with.
Application has the following interesting features / attributes:
- Name - The Application's name, which is the same as its class name.
- Home Page - The Application's home Page class. Subclasses must override getHomePage() to provide this property value.
- Settings - Application settings are partitioned into sets of related settings using interfaces in the org.apache.wicket.settings package. These interfaces are returned by the following methods, which should be used to configure framework settings for your application: getApplicationSettings(), getDebugSettings(), getExceptionSettings(), getMarkupSettings(), getPageSettings(), getRequestCycleSettings(), getSecuritySettings and getSessionSettings(). These settings are configured by default through the constructor or internalInit methods. Default the application is configured for DEVELOPMENT. You can configure this globally to DEPLOYMENT or override specific settings by implementing the init() method.
- Shared Resources - Resources added to an Application's SharedResources have application-wide scope and can be referenced using a logical scope and a name with the ResourceReference class. ResourceReferences can then be used by multiple components in the same application without additional overhead (beyond the ResourceReference instance held by each referee) and will yield a stable URL, permitting efficient browser caching of the resource (even if the resource is dynamically generated). Resources shared in this manner may also be localized. See {@link org.apache.wicket.request.resource.ResourceReference} for more details.
- Custom Session Subclasses- In order to install your own {@link Session} subclass youmust override Application {@link #newSession(Request,Response)}. For subclasses of {@link WebApplication} you will want to subclass {@link WebSession}.
@see org.apache.wicket.protocol.http.WebApplication @author Jonathan Locke

  private void load() {
    if (buffer.length() == 0)
    {
      String path = Packages.absolutePath(scope, fileName);


      Application app = Application.get();


      // first try default class loading locator to find the resource
      IResourceStream stream = app.getResourceSettings()
        .getResourceStreamLocator()
        .locate(scope, path, getStyle(), getVariation(), getLocale(), null, false);


      if (stream == null)
      {

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      {
        // ignore this exception.
        log.debug("Class not found by using objects own classloader, trying the IClassResolver");
      }


      Application application = Application.get();
      ApplicationSettings applicationSettings = application.getApplicationSettings();
      IClassResolver classResolver = applicationSettings.getClassResolver();


      Class<?> candidate = null;
      try
      {

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   * Covariant override for easy getting the current {@link WebApplication} without having to cast
   * it.
   */
  public static WebApplication get()
  {
    Application application = Application.get();


    if (application instanceof WebApplication == false)
    {
      throw new WicketRuntimeException(
        "The application attached to the current thread is not a " +

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  {
    super(contentType);


    String path = Packages.absolutePath(clazz, fileName);


    Application app = Application.get();


    // first try default class loading locator to find the resource
    IResourceStream stream = app.getResourceSettings()
      .getResourceStreamLocator()
      .locate(clazz, path);


    if (stream == null)
    {

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   * Covariant override for easy getting the current {@link WebApplication} without having to cast
   * it.
   */
  public static WebApplication get()
  {
    Application application = Application.get();


    if (application instanceof WebApplication == false)
    {
      throw new WicketRuntimeException(
        "The application attached to the current thread is not a " +

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    ThreadContext old = ThreadContext.get(false);
    final ByteArrayInputStream in = new ByteArrayInputStream(data);
    ObjectInputStream ois = null;
    try
    {
      Application oldApplication = ThreadContext.getApplication();
      try
      {
        ois = newObjectInputStream(in);
        String applicationName = (String)ois.readObject();
        if (applicationName != null)
        {
          Application app = Application.get(applicationName);
          if (app != null)
          {
            ThreadContext.setApplication(app);
          }
        }

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      try
      {
        // Can the application always be taken??
        // Should be if serialization happened in thread with application set
        // (WICKET-2195)
        Application application = Application.get();
        IApplicationSettings applicationSettings = application.getApplicationSettings();
        IClassResolver classResolver = applicationSettings.getClassResolver();


        candidate = classResolver.resolveClass(className);
        if (candidate == null)
        {

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    super.onBeforeRender();


    // Set default for before/after link text
    if (beforeDisabledLink == null)
    {
      final Application app = getApplication();
      beforeDisabledLink = app.getMarkupSettings().getDefaultBeforeDisabledLink();
      afterDisabledLink = app.getMarkupSettings().getDefaultAfterDisabledLink();
    }
  }

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    if (valueParser.matches())
    {
      final String imageReferenceName = valueParser.getImageReferenceName();
      final String specification = Strings.replaceHtmlEscapeNumber(valueParser.getSpecification());
      final String factoryName = valueParser.getFactoryName();
      final Application application = component.getApplication();


      // Do we have a reference?
      if (!Strings.isEmpty(imageReferenceName))
      {
        // Is resource already available via the application?
        if (application.getResourceReferenceRegistry().getResourceReference(
          Application.class, imageReferenceName, locale, style, variation, true, false) == null)
        {
          // Resource not available yet, so create it with factory and
          // share via Application
          final IResource imageResource = getResourceFactory(application, factoryName).newResource(
            specification, locale, style, variation);


          ResourceReference ref = new SimpleStaticResourceReference(Application.class,
            imageReferenceName, locale, style, variation, imageResource);


          application.getResourceReferenceRegistry().registerResourceReference(ref);
        }


        // Create resource reference
        resourceReference = new PackageResourceReference(Application.class,
          imageReferenceName, locale, style, variation);

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      {
        ois = objectStreamFactory.newObjectInputStream(in);
        String applicationName = (String)ois.readObject();
        if (applicationName != null && !Application.exists())
        {
          Application app = Application.get(applicationName);
          if (app != null)
          {
            ThreadContext.setApplication(app);
          }
        }

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