/*
 * 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 org.apache.jdo.tck.query.result;

import java.util.Arrays;
import javax.jdo.JDOQLTypedQuery;
import org.apache.jdo.tck.pc.company.CompanyModelReader;
import org.apache.jdo.tck.pc.company.Department;
import org.apache.jdo.tck.pc.company.Employee;
import org.apache.jdo.tck.pc.company.QDepartment;
import org.apache.jdo.tck.pc.company.QEmployee;
import org.apache.jdo.tck.query.QueryElementHolder;
import org.apache.jdo.tck.query.QueryTest;
import org.apache.jdo.tck.util.BatchTestRunner;

/**
 * <B>Title:</B> NullPointerException in Result Expression. <br>
 * <B>Keywords:</B> query <br>
 * <B>Assertion ID:</B> A14.6.9-4. <br>
 * <B>Assertion Description: </B> If any result is a navigational expression, and a non-terminal
 * field or variable has a null value for a particular set of conditions (the result calculation
 * would throw NullPointerException), then the result is null for that result expression.
 */
public class NPEInResultExpr extends QueryTest {

  /** */
  private static final String ASSERTION_FAILED = "Assertion A14.6.9-4 (NPEInResultExpr) failed: ";

  /**
   * The <code>main</code> is called when the class is directly executed from the command line.
   *
   * @param args The arguments passed to the program.
   */
  public static void main(String[] args) {
    BatchTestRunner.run(NPEInResultExpr.class);
  }

  /** */
  public void testPositive0() {
    Object expected = Arrays.asList("emp2Last", null, "emp2Last", "emp2Last", "emp2Last");

    JDOQLTypedQuery<Employee> query = getPM().newJDOQLTypedQuery(Employee.class);
    QEmployee cand = QEmployee.candidate();
    query.result(false, cand.manager.lastname);

    QueryElementHolder<Employee> holder =
        new QueryElementHolder<>(
            /*UNIQUE*/ null,
            /*RESULT*/ "manager.lastname",
            /*INTO*/ null,
            /*FROM*/ Employee.class,
            /*EXCLUDE*/ null,
            /*WHERE*/ null,
            /*VARIABLES*/ null,
            /*PARAMETERS*/ null,
            /*IMPORTS*/ null,
            /*GROUP BY*/ null,
            /*ORDER BY*/ null,
            /*FROM*/ null,
            /*TO*/ null,
            /*JDOQLTyped*/ query,
            /*paramValues*/ null);

    executeAPIQuery(ASSERTION_FAILED, holder, expected);
    executeSingleStringQuery(ASSERTION_FAILED, holder, expected);
    executeJDOQLTypedQuery(ASSERTION_FAILED, holder, null, true, expected);
  }

  /** */
  @SuppressWarnings("unchecked")
  public void testPositive1() {
    Object expected = Arrays.asList("emp2Last", null, "emp2Last", "emp2Last", "emp2Last");

    JDOQLTypedQuery<Department> query = getPM().newJDOQLTypedQuery(Department.class);
    QDepartment cand = QDepartment.candidate();
    QEmployee e = QEmployee.variable("e");
    query.filter(cand.employees.contains(e));
    query.result(false, e.manager.lastname);

    QueryElementHolder<Department> holder =
        new QueryElementHolder<>(
            /*UNIQUE*/ null,
            /*RESULT*/ "e.manager.lastname",
            /*INTO*/ null,
            /*FROM*/ Department.class,
            /*EXCLUDE*/ null,
            /*WHERE*/ "employees.contains(e)",
            /*VARIABLES*/ "Employee e",
            /*PARAMETERS*/ null,
            /*IMPORTS*/ null,
            /*GROUP BY*/ null,
            /*ORDER BY*/ null,
            /*FROM*/ null,
            /*TO*/ null,
            /*JDOQLTyped*/ query,
            /*paramValues*/ null);

    executeAPIQuery(ASSERTION_FAILED, holder, expected);
    executeSingleStringQuery(ASSERTION_FAILED, holder, expected);
    executeJDOQLTypedQuery(ASSERTION_FAILED, holder, null, true, expected);
  }

  /**
   * @see org.apache.jdo.tck.JDO_Test#localSetUp()
   */
  @Override
  protected void localSetUp() {
    addTearDownClass(CompanyModelReader.getTearDownClasses());
    loadAndPersistCompanyModel(getPM());
  }
}