Examples of javax.servlet.Filter

javax.servlet.Filter
Interface definition for filter objects @author Rick Knowles


        // Call the next filter if there is one
        if (this.iterator.hasNext()) {
            ApplicationFilterConfig filterConfig =
              (ApplicationFilterConfig) iterator.next();
            Filter filter = null;
            try {
                filter = filterConfig.getFilter();
                support.fireInstanceEvent(InstanceEvent.BEFORE_FILTER_EVENT,
                                          filter, request, response);
                filter.doFilter(request, response, this);
                support.fireInstanceEvent(InstanceEvent.AFTER_FILTER_EVENT,
                                          filter, request, response);
            } catch (IOException e) {
                if (filter != null)
                    support.fireInstanceEvent(InstanceEvent.AFTER_FILTER_EVENT,

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            this.filter = null;


        } else {


            // Allocate a new filter instance
            Filter filter = getFilter();


        }


    }

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        //Apply the acquired and/or configured filters:
        Map<String, Filter> filters = getFilters();
        if (!CollectionUtils.isEmpty(filters)) {
            for (Map.Entry<String, Filter> entry : filters.entrySet()) {
                String name = entry.getKey();
                Filter filter = entry.getValue();
                applyGlobalPropertiesIfNecessary(filter);
                if (filter instanceof Nameable) {
                    ((Nameable) filter).setName(name);
                }
                //'init' argument is false, since Spring-configured filters should be initialized

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     * later during filter chain construction.
     */
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof Filter) {
            log.debug("Found filter chain candidate filter '{}'", beanName);
            Filter filter = (Filter) bean;
            applyGlobalPropertiesIfNecessary(filter);
            getFilters().put(beanName, filter);
        } else {
            log.trace("Ignoring non-Filter bean '{}'", beanName);
        }

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    protected void registerFilters(Map<String, Filter> filters, FilterChainManager manager) {
        if (!CollectionUtils.isEmpty(filters)) {
            boolean init = getFilterConfig() != null; //only call filter.init if there is a FilterConfig available
            for (Map.Entry<String, Filter> entry : filters.entrySet()) {
                String name = entry.getKey();
                Filter filter = entry.getValue();
                manager.addFilter(name, filter, init);
            }
        }
    }

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            addToChain(chainName, name, config);
        }
    }


    protected void addFilter(String name, Filter filter, boolean init, boolean overwrite) {
        Filter existing = getFilter(name);
        if (existing == null || overwrite) {
            if (filter instanceof Nameable) {
                ((Nameable) filter).setName(name);
            }
            if (init) {

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    public void addToChain(String chainName, String filterName, String chainSpecificFilterConfig) {
        if (!StringUtils.hasText(chainName)) {
            throw new IllegalArgumentException("chainName cannot be null or empty.");
        }
        Filter filter = getFilter(filterName);
        if (filter == null) {
            throw new IllegalArgumentException("There is no filter with name '" + filterName +
                    "' to apply to chain [" + chainName + "] in the pool of available Filters.  Ensure a " +
                    "filter with that name/path has first been registered with the addFilter method(s).");
        }

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    if (errs != null && !errs.isEmpty()) return;
    
    //carry the current event that would be used by the filter chain.
    exec.setAttribute(ZkAuthenticationProcessingFilter.CURRENT_EVENT, evt);
    
    Filter filter = (Filter) SpringUtil.getBean("zkFilterChainProxy");
    if (filter != null) {
      ServletRequest request = (ServletRequest) exec.getNativeRequest();
      ServletResponse response = (ServletResponse) exec.getNativeResponse();
      ServletResponse resp = BufferedResponse.getInstance(response, new NullWriter());
      try {
        filter.doFilter(request, resp, new NullFilterChain());
      } catch(Exception ex1) {
        throw UiException.Aide.wrap(ex1); //should never occur
      }
      
      //after filter chain, SecurityContext could have changed

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        if (filterCount < filters.size()) {
            int currentCount = filterCount;
            filterCount++;
            
            Filter filter = filters.get(currentCount);


            if (logger.isDebugEnabled()) 
                logger.debug("Getting filter for " + currentCount + ObjectUtils.identityToString(filter));
            
            filter.doFilter(request, response, this);
        }
        else if (servlet != null) {
            servlet.service(request, response);
        } else {
            incomplete = true;

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            invoker.invoke(request, response, null);
        } else if (target instanceof HttpServlet) {
            HttpServlet servlet = (HttpServlet) target;
            servlet.service(request, response);
        } else if (target instanceof Filter) {
            Filter filter = (Filter) target;
            filter.doFilter(request, response, filterChain);
        } else {
            logger.warn("invoke called with target " + (target != null ) + " which is not an instance of " + HttpServiceInvoker.class.getSimpleName() + ", " +
                    HttpServlet.class.getSimpleName() + " or " + Filter.class.getName());
        }

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