/*
* 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.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import com.hp.hpl.jena.sparql.core.Var;
import com.hp.hpl.jena.sparql.engine.binding.BindingFactory;
import com.hp.hpl.jena.sparql.expr.E_Function;
import com.hp.hpl.jena.sparql.expr.E_Multiply;
import com.hp.hpl.jena.sparql.expr.Expr;
import com.hp.hpl.jena.sparql.expr.ExprList;
import com.hp.hpl.jena.sparql.expr.ExprVar;
import com.hp.hpl.jena.sparql.expr.NodeValue;
import com.hp.hpl.jena.sparql.expr.nodevalue.NodeValueInteger;
import com.hp.hpl.jena.sparql.function.FunctionEnvBase;
import com.hp.hpl.jena.sparql.util.NodeFactoryExtra;
/**
* Tests which check that functions are not expanded when {@link UserDefinedFunctionFactory#setPreserveDependencies(boolean)} is set to true
*
*/
public class TestFunctionNonExpansion {
@BeforeClass
public static void setup() {
UserDefinedFunctionFactory.getFactory().clear();
UserDefinedFunctionFactory.getFactory().setPreserveDependencies(true);
}
@AfterClass
public static void teardown() {
UserDefinedFunctionFactory.getFactory().clear();
UserDefinedFunctionFactory.getFactory().setPreserveDependencies(false);
}
@Test
public void test_function_non_expansion_01() {
Expr square = new E_Multiply(new ExprVar("x"), new ExprVar("x"));
UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
//Test that with preserveDependencies set to true that the definition of cube is not expanded
Expr cube = new E_Multiply(new E_Function("http://example/square", new ExprList(new ExprVar("x"))), new ExprVar("x"));
UserDefinedFunctionFactory.getFactory().add("http://example/cube", cube, new ArrayList<Var>(cube.getVarsMentioned()));
UserDefinedFunctionDefinition def = UserDefinedFunctionFactory.getFactory().get("http://example/cube");
Expr base = def.getBaseExpr();
Assert.assertTrue(base instanceof E_Multiply);
E_Multiply multiply = (E_Multiply)base;
Assert.assertTrue(multiply.getArg1() instanceof E_Function);
Assert.assertTrue(multiply.getArg2() instanceof ExprVar);
E_Function lhs = (E_Function)multiply.getArg1();
Assert.assertEquals("http://example/square", lhs.getFunctionIRI());
Assert.assertEquals(1, base.getVarsMentioned().size());
}
@Test
public void test_function_non_expansion_02() {
Expr square = new E_Multiply(new ExprVar("x"), new ExprVar("x"));
UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
//This test illustrates that if we change the definition of square and call our function again we can
//get a different result with dependencies preserved because the definition of the dependent function can change
Expr cube = new E_Multiply(new E_Function("http://example/square", new ExprList(new ExprVar("x"))), new ExprVar("x"));
UserDefinedFunctionFactory.getFactory().add("http://example/cube", cube, new ArrayList<Var>(cube.getVarsMentioned()));
UserDefinedFunction f = (UserDefinedFunction) UserDefinedFunctionFactory.getFactory().create("http://example/cube");
f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
Expr actual = f.getActualExpr();
NodeValue result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
Assert.assertEquals(8, NodeFactoryExtra.nodeToInt(result.asNode()));
//Change the definition of the function we depend on
square = new ExprVar("x");
UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<Var>(square.getVarsMentioned()));
f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
actual = f.getActualExpr();
result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
Assert.assertEquals(4, NodeFactoryExtra.nodeToInt(result.asNode()));
}
}