added special handling of the BinaryResponseWriter in the solr interface

which makes it possible to use solrj with the javabin format which is
much better (compressed, no xml overhead, java object streams) and
faster. Furthermore, this enables the 'shards' option in the solr
interface which connects one solr (YaCy) to another solr (YaCy) ad-hoc.

htroot/solr/select.java

@@ -58,6 +58,7 @@ import org.apache.solr.common.util.NamedList;
 import org.apache.solr.core.SolrCore;
 import org.apache.solr.request.SolrQueryRequest;
 import org.apache.solr.request.SolrRequestInfo;
+import org.apache.solr.response.BinaryResponseWriter;
 import org.apache.solr.response.QueryResponseWriter;
 import org.apache.solr.response.ResultContext;
 import org.apache.solr.response.SolrQueryResponse;
@@ -228,15 +229,25 @@ public class select {
         }
 
         // write the result directly to the output stream
-        Writer ow = new FastWriter(new OutputStreamWriter(out, UTF8.charset));
-        try {
-            responseWriter.write(ow, req, response);
-            ow.flush();
-        } catch (final IOException e1) {
-        } finally {
-            req.close();
-            SolrRequestInfo.clearRequestInfo();
-            try {ow.close();} catch (final IOException e1) {}
+        if (responseWriter instanceof BinaryResponseWriter) {
+            try {
+                ((BinaryResponseWriter) responseWriter).write(out, req, response);
+            } catch (final IOException e1) {
+            } finally {
+                req.close();
+                SolrRequestInfo.clearRequestInfo();
+            }
+        } else {
+            Writer ow = new FastWriter(new OutputStreamWriter(out, UTF8.charset));
+            try {
+                responseWriter.write(ow, req, response);
+                ow.flush();
+            } catch (final IOException e1) {
+            } finally {
+                req.close();
+                SolrRequestInfo.clearRequestInfo();
+                try {ow.close();} catch (final IOException e1) {}
+            }
         }
 
         // log result