MPSPARQL-22: Allow simple searching in the info records

Always takes the last term in the query, ignoring all
attributes and operators. If the query is an empty string,
or starts with something non-alphabetic, will return info
on all bases. Otherwise on the matching base only.

diff --git a/src/filter_sparql.cpp b/src/filter_sparql.cpp
index 8cf720a..a38567d 100644 (file)
--- a/src/filter_sparql.cpp
+++ b/src/filter_sparql.cpp
@@ -22,6 +22,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include <yaz/srw.h>
 #include <yaz/diagbib1.h>
 #include <yaz/match_glob.h>
+#include <yaz/querytowrbuf.h>
 #include <boost/scoped_ptr.hpp>
 #include <boost/thread/mutex.hpp>
 #include <boost/thread/condition.hpp>
@@ -709,24 +710,32 @@ Z_Records *yf::SPARQL::Session::explain_fetch(
 Z_APDU *yf::SPARQL::Session::explain_search(mp::Package &package,
                            Z_APDU *apdu_req,
                            mp::odr &odr,
-                           const char *sparql_query,
+                           const char *explain_query,
                            FrontendSetPtr fset)
 {
     Z_SearchRequest *req = apdu_req->u.searchRequest;
     Z_APDU *apdu_res = 0;
     //mp::wrbuf w;
 
-    package.log("sparql", YLOG_LOG, "Explain search" );
+    package.log("sparql", YLOG_LOG, "Explain search '%s'", explain_query );
+    const char *term = explain_query + strlen(explain_query);
+    while ( term > explain_query && *term != ' ')
+        term--;
+    term++;
+    if ( ! isalpha( *term) )
+        term=""; // anything non-alpha is taken to mean all 
+                 // Empty string is seen here as two double quotes ""
+                 // so it returns all bases as well
     int numbases = 0;
-    //std::list<std::string> dblist;
     std::list<ConfPtr>::const_iterator it = m_sparql->db_conf.begin();
     m_frontend_sets[req->resultSetName] = fset;
     fset->explaindblist.clear();
     fset->explaindblist.reserve(m_sparql->db_conf.size());
 
     for (; it != m_sparql->db_conf.end(); it++)
-        if ((*it)->schema.length() > 0 )  // searchable db
-        {
+        if ( (*it)->schema.length() > 0  &&  // searchable db
+            (!*term || strcmp(term,(*it)->db.c_str())==0)  )
+        { // and want all, or found the matching one
             numbases++;
             package.log("sparql", YLOG_LOG, "Explain %d: '%s'",
                         numbases, (*it)->db.c_str() );
@@ -775,6 +784,7 @@ Z_APDU *yf::SPARQL::Session::explain_search(mp::Package &package,
     return apdu_res;
 }
 
+
 Z_APDU *yf::SPARQL::Session::search(mp::Package &package,
                                     Z_APDU *apdu_req,
                                     mp::odr &odr,
@@ -982,9 +992,10 @@ void yf::SPARQL::Session::handle_z(mp::Package &package, Z_APDU *apdu_req)
             else
             { // The magic "explain" base
                 yaz_log(YLOG_LOG,"About to call explain_search");
-                const char *qry = "query";
+                mp::wrbuf qry;
+                yaz_query_to_wrbuf(qry, req->query);
                 apdu_res = explain_search( package, apdu_req, odr,
-                                           qry, fset);
+                                           qry.c_str(), fset);
                   // TODO - Extract at least a term from the query, and
                   // do some filtering by that
                 yaz_log(YLOG_LOG,"Returned from explain_search");