Extract String to Set transformation.

src/main/java/ch/psi/daq/queryrest/filter/CorsFilter.java

@@ -2,10 +2,10 @@ package ch.psi.daq.queryrest.filter;
 
 import java.io.IOException;
 import java.util.Arrays;
-import java.util.HashSet;
 import java.util.Set;
 import java.util.stream.Collectors;
 
+import javax.annotation.PostConstruct;
 import javax.servlet.FilterChain;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
@@ -24,17 +24,18 @@ public class CorsFilter extends OncePerRequestFilter {
    @Value("${queryrest.cors.forceallheaders}")
    private boolean forceAllHeaders;
    
+   private Set<String> allowedOrigins;
+   
+   @PostConstruct
+   public void afterPropertiesSet(){     
+      allowedOrigins = Arrays.stream(configuredOrigins.split(","))
+            .map(s -> s.trim())
+            .collect(Collectors.toSet());
+   }
 
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
          throws ServletException, IOException {     
-
-      Set<String> allowedOrigins = new HashSet<String>(Arrays.asList(configuredOrigins.split(","))
-            .stream()
-            .map(s -> {
-               return s.trim(); })
-            .collect(Collectors.toList()));
-      
       String originHeader = request.getHeader("Origin");
       if (forceAllHeaders) {
          // include headers no matter what - good for development