# AGLubm50Prolog.java

`package com.franz.agbase.examples;
import com.franz.agbase.AllegroGraph;
import com.franz.agbase.AllegroGraphConnection;
import com.franz.agbase.AllegroGraphException;
import com.franz.agbase.PrologSelectQuery;
import com.franz.agbase.AllegroGraph.StoreAttribute;
public class AGLubm50Prolog {
public static int port = 4126;
public static String store = AGPaths.TRIPLE_STORES + "LUBM-50";
public static String ubnamespace = "http://www.lehigh.edu/%7Ezhp2/2004/0401/univ-bench.owl#";
/**
* Demonstrates Prolog Select versions of the LUBM benchmark queries
* on the LUBM 50 data set.
*
* Note that RDFS++ reasoning must be enabled to obtain the correct
* answers.
*
* This example assumes that the LUBM-50 triple store has already
* been built. Please refer to AGLubm50Build.java to build it.
*
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.setPort(port);
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem", e);
}
// Open the LUBM triple store read-only, which must already exist
AllegroGraph ts = new AllegroGraph(store);
ts.setAttribute(StoreAttribute.READ_ONLY, true);
ags.open(ts);
System.out.println(store + ": " + ts.numberOfTriples() + " triples.");
// Register namespaces used in queries
ts.registerNamespace("ub", ubnamespace);
ts.registerNamespace("u0d0", "http://www.Department0.University0.edu/");
// Add Prolog rule needed for query 12.
String rule = "(<-- (Chair ?x1)" +
"(q ?x1 !ub:headOf ?y)" +
"(q ?x1 !rdf:type !ub:Person)" +
"(q ?y !rdf:type !ub:Department))";
ags.addPrologRule(rule);
// Run the LUBM queries with RDFS++ reasoning enabled
doQuery1(ts);
doQuery2(ts);
doQuery3(ts);
doQuery4(ts);
doQuery5(ts);
doQuery6(ts);
doQuery7(ts);
doQuery8(ts);
doQuery9(ts);
doQuery10(ts);
doQuery11(ts);
doQuery12(ts);
doQuery13(ts);
doQuery14(ts);
// Close the triple store and disconnect from the server.
ts.closeTripleStore();
ags.disable();
}
public static void doQuery1(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !ub:takesCourse !u0d0:GraduateCourse0)" +
"(q ?x !rdf:type !ub:GraduateStudent)";
doQuery(ts,1,vars,query);
}
public static void doQuery2(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x","y","z"};
String query =
"(q ?z !rdf:type !ub:Department)" +
"(q ?z !ub:subOrganizationOf ?y)" +
"(q ?x !ub:undergraduateDegreeFrom ?y)" +
"(q ?x !ub:memberOf ?z)" +
"(q ?x !rdf:type !ub:GraduateStudent)" +
"(q ?y !rdf:type !ub:University)";
doQuery(ts,2,vars,query);
}
public static void doQuery3(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !ub:publicationAuthor !u0d0:AssistantProfessor0)" +
"(q ?x !rdf:type !ub:Publication)";
doQuery(ts,3,vars,query);
}
public static void doQuery4(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x","name","email","telephone"};
String query =
"(q ?x !ub:worksFor !<http://www.Department0.University0.edu>)" +
"(q ?x !rdf:type !ub:Professor)" +
"(q ?x !ub:name ?name)" +
"(q ?x !ub:emailAddress ?email)" +
"(q ?x !ub:telephone ?telephone)";
doQuery(ts,4,vars,query);
}
public static void doQuery5(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !ub:memberOf !<http://www.Department0.University0.edu>)" +
"(q ?x !rdf:type !ub:Person)";
doQuery(ts,5,vars,query);
}
public static void doQuery6(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !rdf:type !ub:Student)";
doQuery(ts,6,vars,query);
}
public static void doQuery7(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x","y"};
String query =
"(q !u0d0:AssociateProfessor0 !ub:teacherOf ?y)" +
"(q ?y !rdf:type !ub:Course)" +
"(q ?x !ub:takesCourse ?y)" +
"(q ?x !rdf:type !ub:Student)";
doQuery(ts,7,vars,query);
}
public static void doQuery8(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"y","x","email"};
String query =
"(q ?y !ub:subOrganizationOf !<http://www.University0.edu>)" +
"(q ?y !rdf:type !ub:Department)" +
"(q ?x !ub:memberOf ?y)" +
"(q ?x !rdf:type !ub:Student)" +
"(q ?x !ub:emailAddress ?email)";
doQuery(ts,8,vars,query);
}
public static void doQuery9(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x","y","z"};
String query =
"(q ?x !ub:advisor ?y)" +
"(q ?x !ub:takesCourse ?z)" +
"(q ?y !ub:teacherOf ?z)" +
"(q ?x !rdf:type !ub:Student)" +
"(q ?y !rdf:type !ub:Faculty)" +
"(q ?z !rdf:type !ub:Course)";
doQuery(ts,9,vars,query);
}
public static void doQuery10(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !ub:takesCourse !u0d0:GraduateCourse0)" +
"(q ?x !rdf:type !ub:Student)";
doQuery(ts,10,vars,query);
}
public static void doQuery11(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !ub:subOrganizationOf !<http://www.University0.edu>)" +
"(q ?x !rdf:type !ub:ResearchGroup)";
doQuery(ts,11,vars,query);
}
public static void doQuery12(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x","y"};
String query =
"(q- ?y !ub:subOrganizationOf !<http://www.University0.edu>)" +
"(q ?y !rdf:type !ub:Department)" +
"(q ?x !ub:memberOf ?y)" +
"(Chair ?x)";
doQuery(ts,12,vars,query);
}
public static void doQuery13(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q !<http://www.University0.edu> !ub:hasAlumnus ?x)" +
"(q ?x !rdf:type !ub:Person)";
doQuery(ts,13,vars,query);
}
public static void doQuery14(AllegroGraph ts) throws AllegroGraphException {
String[] vars = new String[]{"x"};
String query =
"(q ?x !rdf:type !ub:UndergraduateStudent)";
doQuery(ts,14,vars,query);
}
public static void doQuery(AllegroGraph ts, int qi, String[] vars, String query) throws AllegroGraphException {
System.out.print("Query " + qi + ": ");
PrologSelectQuery psq = new PrologSelectQuery();
psq.setTripleStore(ts);
psq.setVariables(vars);
psq.setQuery(query);
psq.setIncludeInferred(true);
long begin = System.nanoTime();
long n = psq.count();
long delta = (System.nanoTime() - begin);
System.out.println(n + " answers in " + (delta/1000000000.0) + " seconds.");
}
}
`

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