added Statistics Facilities to PDF-AS Web

1 files changed, 59 insertions, 0 deletions

diff --git a/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/filter/UserAgentFilter.java b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/filter/UserAgentFilter.java
new file mode 100644
index 00000000..504cf472
--- /dev/null
+++ b/pdf-as-web/src/main/java/at/gv/egiz/pdfas/web/filter/UserAgentFilter.java
@@ -0,0 +1,59 @@
+package at.gv.egiz.pdfas.web.filter;
+
+import java.io.IOException;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class UserAgentFilter implements Filter {
+
+	private static final Logger logger = LoggerFactory
+			.getLogger(UserAgentFilter.class);
+
+	@Override
+	public void init(FilterConfig filterConfig) throws ServletException {
+		// TODO Auto-generated method stub
+
+	}
+
+	private static final ThreadLocal<String> requestUserAgent = new ThreadLocal<String>() {
+
+		@Override
+		protected String initialValue() {
+			return "unkown";
+		}
+		
+	};
+
+	@Override
+	public void doFilter(ServletRequest request, ServletResponse response,
+			FilterChain chain) throws IOException, ServletException {
+		if(request instanceof HttpServletRequest) {
+			logger.debug("Processing Parameters into Attributes");
+			HttpServletRequest httpRequest = (HttpServletRequest)request;
+			requestUserAgent.set(httpRequest.getHeader("User-Agent"));
+		}
+		try {
+			chain.doFilter(request, response);
+		} finally {
+			requestUserAgent.remove();
+		}
+	}
+
+	@Override
+	public void destroy() {
+	}
+
+	public static String getUserAgent() {
+		return requestUserAgent.get();
+	}
+	
+}