Examples of org.restlet.routing.Filter

org.restlet.routing.Filter
Restlet filtering calls before passing them to an attached Restlet. The purpose is to do some pre-processing or post-processing on the calls going through it before or after they are actually handled by an attached Restlet. Also note that you can attach and detach targets while handling incoming calls as the filter is ensured to be thread-safe.

Concurrency note: instances of this class or its subclasses can be invoked by several threads at the same time and therefore must be thread-safe. You should be especially careful when storing state in member variables. @author Jerome Louvel

    }


    /** Start hook. */
    @Override
    public synchronized void start() throws Exception {
        Filter filter = null;


        for (Service service : getHelped().getServices()) {
            if (service.isEnabled()) {
                // Attach the service inbound filters
                filter = service

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        // Let's actually start the component
        if (!success) {
            getHelped().stop();
        } else {
            Filter filter = null;


            for (Service service : getHelped().getServices()) {
                if (service.isEnabled()) {
                    // Attach the service inbound filters
                    filter = service

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    /**
     * Test Restlet instance attaching/detaching.
     */
    public void testAttachDetachInstance() throws Exception {
        final Filter filter = getFilter();
        assertFalse(filter.hasNext());
        filter.setNext(getRestlet());
        filter.start();
        assertTrue(filter.isStarted());
        assertFalse(filter.isStopped());
        final Request request = getRequest();
        final Response response = getResponse(request);
        filter.handle(request, response);
        assertTrue(filter.hasNext());
        filter.setNext((Restlet) null);
        assertFalse(filter.hasNext());
    }

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            }
            Class def = getTargetClass(child);
            if (def==null) {
               return;
            }
            Filter childFilter = null;
            try {
               childFilter = createFilter(parentContext,def,child);
            } catch (Exception ex) {
               LOG.log(Level.SEVERE,"Cannot instantiate filter.",ex);
               return;

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    /**
     * Test not started Filter.
     */
    public void testIllegalStartedState() throws Exception {
        final Filter filter = getFilter();
        filter.setNext(getRestlet());
        assertTrue(filter.hasNext());
        assertFalse(filter.isStarted());
        assertTrue(filter.isStopped());
        final Request request = getRequest();
        final Response response = getResponse(request);
        try {
            filter.handle(request, response);


            if (!filter.isStarted()) {
                fail("Filter handles call without being started");
            }
        } catch (Exception ex) {
            // noop.
        }

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    /**
     * Test with null target.
     */
    public void testIllegalTarget() throws Exception {
        final Filter filter = getFilter();
        filter.start();
        assertTrue(filter.isStarted());
        assertFalse(filter.isStopped());
        assertFalse(filter.hasNext());
        final Request request = getRequest();
        final Response response = getResponse(request);
        try {
            filter.handle(request, response);
            fail("Filter handles call without a target");
        } catch (Exception ex) {
            // noop.
        }
    }

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      router.attach("/",UsersResource.class);
      router.attach("/{alias}",UserResource.class);
      router.attach("/{alias}/{facet}",UserResource.class);
      router.attach("/{alias}/{facet}/",UserResource.class);
      router.attach("/{alias}/{facet}/{facet-alias}",UserResource.class);
      Filter dbFilter = new Filter(getContext()) {
         protected int beforeHandle(Request request,Response response)
         {
            request.getAttributes().put(App.DB_ATTR,db);
            return Filter.CONTINUE;
         }
      };
      dbFilter.setNext(router);
      return dbFilter;
      
   }

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      getContext().getAttributes().put(WebComponent.ATOMOJO_TMP_DIR,context.getAttributes().get(WebComponent.ATOMOJO_TMP_DIR));
   }
   
   @Override
   public Restlet createRoot() {
      Filter attFilter = new Filter(getContext()) {
         protected int beforeHandle(Request request,Response response)
         {
            request.getAttributes().put(App.DB_ATTR,db);
            request.getAttributes().put(App.STORAGE_ATTR,storage);
            request.getAttributes().put(App.RESOURCE_BASE_ATTR,resourceBase);
            return Filter.CONTINUE;
         }
      };
      Router router = new Router(getContext());
      attFilter.setNext(router);
      router.setDefaultMatchingMode(Template.MODE_STARTS_WITH);
      router.attach("/users",new UserApplication(getContext(),db));
      router.attach("/sync",new SyncApplication(getContext(),db,storage));
      router.attach("/backup",BackupResource.class);
      router.attach("/backup.zip",BackupResource.class);

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   public Restlet createRoot() {
      Router router = new Router(getContext());
      router.setDefaultMatchingMode(Template.MODE_STARTS_WITH);
      router.attach("/",new ClassResourceFinder(getContext(),EditApplication.class.getClassLoader(),EditApplication.class));
      router.attach("/editor/",new ClassResourceFinder(getContext(),ClassResourceFinder.class.getClassLoader(),ClassResourceFinder.class));
      Filter uploadFilter = new Filter(getContext()) {
         protected int beforeHandle(Request request,Response response)
         {
            request.getAttributes().put("app.url", "riap://application/app/");
            return Filter.CONTINUE;
         }
      };
      uploadFilter.setNext(new UploadApplication(getContext(),atomApp));
      router.attach("/upload",uploadFilter);
      router.attach("/app",atomApp);
      Filter guard = new UserGuard(getContext(),ChallengeScheme.HTTP_BASIC,"Atom User",atomApp.getAuthService());
      guard.setNext(router);
      return guard;
   }

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      realmRouter.attach("/groups/{group-id}/{facet}/",GroupResource.class).getTemplate().setMatchingMode(Template.MODE_EQUALS);
      realmRouter.attach("/groups/{group-id}/{facet}/{facet-id}",GroupResource.class).getTemplate().setMatchingMode(Template.MODE_EQUALS);
      realmRouter.attach("/groups/{group-id}/{facet}/a/{facet-name}",GroupResource.class).getTemplate().setMatchingMode(Template.MODE_EQUALS);
      realmRouter.attach("/groups/{group-id}/{facet}/n/{facet-name}",GroupResource.class).getTemplate().setMatchingMode(Template.MODE_EQUALS);
      
      Filter realmByName = new RealmFilter(getContext(),db);
      mainRouter.attach("/realms/n/{realm-name}",realmByName);
      RealmUserGuard realmByNameGuard = new RealmUserGuard(getContext(),db,null,ChallengeScheme.HTTP_BASIC,"Realm Users",superuser) {
         protected boolean hasRealmSpecific(Request request,RealmUser user)
         {
            // we need to check the group because a user could have realm superuser for another realm
            try {
               Group admin = db.getGroup(user.getRealm(),"admin");
               return user.isMemberOf(admin); 
            } catch (SQLException ex) {
               getContext().getLogger().log(Level.SEVERE,"Cannot check role due to database error.",ex);
               return false;
            }
         }
      };
      realmByNameGuard.addPermission(realmSuperuser);
      realmByName.setNext(realmByNameGuard);
      realmByNameGuard.setNext(realmRouter);
      
      Filter realmById = new RealmFilter(getContext(),db);
      mainRouter.attach("/realms/{realm-id}",realmById);
      RealmUserGuard realmByIdGuard = new RealmUserGuard(getContext(),db,null,ChallengeScheme.HTTP_BASIC,"Realm Users",superuser) {
         protected boolean hasRealmSpecific(Request request,RealmUser user)
         {
            try {
               Group admin = db.getGroup(user.getRealm(),"admin");
               return user.isMemberOf(admin); 
            } catch (SQLException ex) {
               getContext().getLogger().log(Level.SEVERE,"Cannot check role due to database error.",ex);
               return false;
            }
         }
      };
      realmByIdGuard.addPermission(realmSuperuser);
      realmById.setNext(realmByIdGuard);
      realmByIdGuard.setNext(realmRouter);
      
      UserGuard adminGuard = new UserGuard(getContext(),db,ChallengeScheme.HTTP_BASIC,"users");
      adminGuard.setPermission(superuser);
      mainRouter.attach("/admin",adminGuard);

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