fix: display and calculate authors and namespace search navigator if configured (otherwise skip overhead)

(leave hosts, topics and  not in ConfigPortal included filetype,  protocoll navigator untouched)

source/net/yacy/search/query/SearchEvent.java

@@ -154,8 +154,18 @@ public final class SearchEvent {
         
         this.maxExpectedRemoteReferences = new AtomicInteger(0);
         this.expectedRemoteReferences = new AtomicInteger(0);
+        // prepare configured search navigation
+        final String navcfg = Switchboard.getSwitchboard().getConfig("search.navigation", "");
+        if (navcfg.contains("authors")) {
             this.authorNavigator = new ConcurrentScoreMap<String>();
+        } else {
+            this.authorNavigator = null;
+        }
+        if (navcfg.contains("namespace")) {
             this.namespaceNavigator = new ConcurrentScoreMap<String>();
+        } else {
+            this.namespaceNavigator = null;
+        }
         this.protocolNavigator = new ConcurrentScoreMap<String>();
         this.filetypeNavigator = new ConcurrentScoreMap<String>();
         this.snippets = new ConcurrentHashMap<String, String>();
@@ -470,12 +480,15 @@ public final class SearchEvent {
         ReversibleScoreMap<String> fcts = facets.get(YaCySchema.host_s.getSolrFieldName());
         if (fcts != null) this.rankingProcess.hostNavigator.inc(fcts);
 
+        if (this.filetypeNavigator != null) {
             fcts = facets.get(YaCySchema.url_file_ext_s.getSolrFieldName());
             if (fcts != null) this.filetypeNavigator.inc(fcts);
+        }
 
+        if (this.protocolNavigator != null) {
             fcts = facets.get(YaCySchema.url_protocol_s.getSolrFieldName());
             if (fcts != null) this.protocolNavigator.inc(fcts);
-        
+        }
         //fcts = facets.get(YaCySchema.author.getSolrFieldName());
         //if (fcts != null) this.authorNavigator.inc(fcts);
         
@@ -823,7 +836,7 @@ public final class SearchEvent {
                 }
 
                 // add author to the author navigator
-                this.authorNavigator.inc(pageauthor);
+                if (this.authorNavigator != null) this.authorNavigator.inc(pageauthor);
             } else if ( this.query.authorhash != null ) {
                 this.query.misses.add(page.hash());
                 continue;
@@ -838,15 +851,17 @@ public final class SearchEvent {
             // from here: collect navigation information
 
             // namespace navigation
+            if (this.namespaceNavigator != null) {
                 String pagepath = page.url().getPath();
-            if ( (p = pagepath.indexOf(':')) >= 0 ) {
+                if ((p = pagepath.indexOf(':')) >= 0) {
                     pagepath = pagepath.substring(0, p);
                     p = pagepath.lastIndexOf('/');
-                if ( p >= 0 ) {
+                    if (p >= 0) {
                         pagepath = pagepath.substring(p + 1);
                         this.namespaceNavigator.inc(pagepath);
                     }
                 }
+            }
 
             return page; // accept url
         }