add language navigation filter clause to rwi results

source/net/yacy/search/index/Segment.java

@@ -103,7 +103,6 @@ public class Segment {
     public static final int  lowcachedivisor =  900;
     public static final long targetFileSize  = 64 * 1024 * 1024; // 256 MB
     public static final int  writeBufferSize = 4 * 1024 * 1024;
-    public static final String UrlDbName = "text.urlmd";
     public static final String termIndexName = "text.index";
     public static final String citationIndexName = "citation.index";
 

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

@@ -1078,6 +1078,14 @@ public final class SearchEvent {
                 continue;
             }
 
+            // check modifier constraint (language)
+            // TODO: : page.language() never null but defaults to "en" (may cause false drop of result)
+            if (this.query.modifier.language != null && !this.query.modifier.language.equals(ASCII.String(page.language()))) {
+                if (log.isFine()) log.fine("dropped RWI: language constraint = " + this.query.modifier.language);
+                if (page.word().local()) this.local_rwi_available.decrementAndGet(); else this.remote_rwi_available.decrementAndGet();
+                continue;
+            }
+
             // Check for blacklist
             if (Switchboard.urlBlacklist.isListed(BlacklistType.SEARCH, page.url())) {
                 if (log.isFine()) log.fine("dropped RWI: url is blacklisted in url blacklist");