/*
    * 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.giraph.conf;
  
  import org.junit.Test;
  
  import static org.apache.giraph.conf.ClassConfOption.getClassesOfType;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.fail;
  
  public class TestGiraphConfiguration {
    public interface If { }
    public class A implements If { }
    public class B implements If { }
    public class C implements If { }
  
    @Test
    public void testSetClasses() {
      GiraphConfiguration conf = new GiraphConfiguration();
      conf.setClasses("foo", If.class, A.class, B.class);
      Class<?>[] klasses = conf.getClasses("foo");
      assertEquals(2, klasses.length);
      assertEquals(A.class, klasses[0]);
      assertEquals(B.class, klasses[1]);
  
      try {
        conf.setClasses("foo", A.class, B.class);
        fail();
      } catch (RuntimeException e) {
        assertEquals(2, conf.getClasses("foo").length);
      }
  
      Class<? extends If>[] klasses2 = getClassesOfType(conf, "foo", If.class);
      assertEquals(2, klasses2.length);
      assertEquals(A.class, klasses2[0]);
      assertEquals(B.class, klasses2[1]);
    }
  
    @Test
    public void testAddToClasses() {
      GiraphConfiguration conf = new GiraphConfiguration();
  
      conf.setClasses("foo", If.class, A.class, B.class);
      ClassConfOption.addToClasses(conf, "foo", C.class, If.class);
      Class<?>[] klasses = conf.getClasses("foo");
      assertEquals(3, klasses.length);
      assertEquals(A.class, klasses[0]);
      assertEquals(B.class, klasses[1]);
      assertEquals(C.class, klasses[2]);
  
      ClassConfOption.addToClasses(conf, "bar", B.class, If.class);
      klasses = conf.getClasses("bar");
      assertEquals(1, klasses.length);
      assertEquals(B.class, klasses[0]);
    }
  }