public boolean userAgentNeedsUpdate()

in extscript-core-root/extscript-core/src/main/java/org/apache/myfaces/extensions/scripting/jsf/resources/deprecated/ResourceImpl.java [267:316]

26 lines of code
8 McCabe index (conditional complexity)


    public boolean userAgentNeedsUpdate(FacesContext context) {
        // RFC2616 says related to If-Modified-Since header the following:
        //
        // "... The If-Modified-Since request-header field is used with a method to 
        // make it conditional: if the requested variant has not been modified since 
        // the time specified in this field, an entity will not be returned from 
        // the server; instead, a 304 (not modified) response will be returned 
        // without any message-body..."
        // 
        // This method is called from ResourceHandlerImpl.handleResourceRequest and if
        // returns false send a 304 Not Modified response.

        String ifModifiedSinceString = context.getExternalContext().getRequestHeaderMap().get("If-Modified-Since");

        if (ifModifiedSinceString == null) {
            return true;
        }

        Long ifModifiedSince = ResourceLoaderUtils.parseDateHeader(ifModifiedSinceString);

        if (ifModifiedSince == null) {
            return true;
        }

        Long lastModified;
        try {
            lastModified = ResourceLoaderUtils.getResourceLastModified(this.getURL());
        } catch (IOException exception) {
            lastModified = -1L;
        }

        if (lastModified >= 0) {
            if (this.couldResourceContainValueExpressions() &&
                    lastModified < _resourceHandlerSupport.getStartupTime()) {
                lastModified = _resourceHandlerSupport.getStartupTime();
            }

            // If the lastModified date is lower or equal than ifModifiedSince,
            // the agent does not need to update.
            // Note the lastModified time is set at milisecond precision, but when 
            // the date is parsed and sent on ifModifiedSince, the exceding miliseconds
            // are trimmed. So, we have to compare trimming this from the calculated
            // lastModified time.
            if ((lastModified - (lastModified % 1000)) <= ifModifiedSince) {
                return false;
            }
        }

        return true;
    }