BAEL-325: Added UML diagrams reflecting the different filter strategies.

patterns/intercepting-filter/src/main/java/com/baeldung/patterns/intercepting/filter/filters/TemplateFilter.java

@@ -9,7 +9,6 @@ import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
 public abstract class TemplateFilter extends BaseFilter {
-
     protected abstract void preFilter(
       HttpServletRequest request,
       HttpServletResponse response

patterns/intercepting-filter/src/main/resources/intercepting_filter-custom_strategy.puml

@@ -0,0 +1,29 @@
+@startuml
+scale 1.5
+
+class FrontControllerServlet {
+    void doGet()
+    void doPost()
+}    
+class FilterManager {
+    {static} void process()
+}
+class FilterChainImpl {
+    void doFilter()
+}
+class AuthenticationFilter {
+    void doFilter()
+}
+class VisitorCounterFilter {
+    void doFilter()
+}
+class FrontCommand {
+    void process()
+}
+
+FrontControllerServlet -- FrontCommand
+FrontCommand .right.-- FilterManager
+FilterManager -- FilterChainImpl
+FilterChainImpl .right.-- AuthenticationFilter
+AuthenticationFilter .right.-- VisitorCounterFilter
+@enduml

patterns/intercepting-filter/src/main/resources/intercepting_filter-standard_strategy.puml

@@ -0,0 +1,26 @@
+@startuml
+scale 1.5
+
+class FrontControllerServlet {
+    void doGet()
+    void doPost()
+}
+abstract class BaseFilter {
+    void init()
+    void destroy()
+}
+class LoggingFilter {
+    void doFilter()
+}
+class EncodingFilter {
+    void doFilter()
+}
+class FrontCommand {
+    void process()
+}
+
+FrontControllerServlet .right.-- FrontCommand
+FrontControllerServlet -- BaseFilter
+BaseFilter <|-- LoggingFilter
+BaseFilter <|-- EncodingFilter
+@enduml

patterns/intercepting-filter/src/main/resources/intercepting_filter-template_strategy.puml

@@ -0,0 +1,25 @@
+@startuml
+scale 1.5
+
+class FrontControllerServlet {
+    void doGet()
+    void doPost()
+}
+abstract class BaseFilter {
+    void init()
+    void destroy()
+}
+abstract class TemplateFilter {
+    {abstract} void preFilter()
+    {abstract} void postFilter()
+    --
+    void doFilter()
+}
+class FrontCommand {
+    void process()
+}
+
+FrontControllerServlet .right.-- FrontCommand
+FrontControllerServlet -- BaseFilter
+BaseFilter <|-- TemplateFilter
+@enduml