/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hp.hpl.jena.sparql.function.user;
import java.util.ArrayList;
import org.junit.Assert;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.sparql.core.Var;
import com.hp.hpl.jena.sparql.engine.binding.Binding;
import com.hp.hpl.jena.sparql.expr.E_Multiply;
import com.hp.hpl.jena.sparql.expr.Expr;
import com.hp.hpl.jena.sparql.expr.ExprVar;
import com.hp.hpl.jena.sparql.util.NodeFactoryExtra;
/**
* Tests that user functions are properly wired in and usable from SPARQL
*
*/
public class TestUserFunctionsInSparql {
@BeforeClass
public static void setup() {
UserDefinedFunctionFactory.getFactory().clear();
//Define a square function
Expr square = new E_Multiply(new ExprVar("x"), new ExprVar("x"));
UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
}
@AfterClass
public static void teardown() {
UserDefinedFunctionFactory.getFactory().clear();
}
@Test
public void test_user_functions_in_sparql() {
Assert.assertTrue(UserDefinedFunctionFactory.getFactory().isRegistered("http://example/square"));
String query = "SELECT (<http://example/square>(2) AS ?square) { }";
Query q = QueryFactory.create(query);
QueryExecution qe = QueryExecutionFactory.create(q, ModelFactory.createDefaultModel());
ResultSet rset = qe.execSelect();
Assert.assertTrue(rset.hasNext());
Binding b = rset.nextBinding();
Assert.assertFalse(rset.hasNext());
qe.close();
//Validate returned value
Node actual = b.get(Var.alloc("square"));
Assert.assertEquals(NodeFactoryExtra.intToNode(4), actual);
}
}