/*
    * 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.commons.functor.core.algorithm;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.NoSuchElementException;
  
  import org.apache.commons.functor.BaseFunctorTest;
  import org.apache.commons.functor.Predicate;
  import org.apache.commons.functor.adapter.LeftBoundPredicate;
  import org.apache.commons.functor.core.IsEqual;
  import org.apache.commons.functor.generator.loop.IteratorToGeneratorAdapter;
  import org.junit.Test;
  
  /**
   * Tests {@link FindWithinGenerator} algorithm.
   */
  public class TestFindWithinGenerator extends BaseFunctorTest {
  
      @Override
      protected Object makeFunctor() throws Exception {
          return new FindWithinGenerator<Object>();
      }
  
      @Test
      public void testObjectEqualsWithIfNone() throws Exception {
          Object obj = new FindWithinGenerator<Object>(1);
          assertEquals("equals must be reflexive", obj, obj);
          assertEquals("hashCode must be reflexive", obj.hashCode(), obj.hashCode());
          assertTrue(!obj.equals(null)); // should be able to compare to null
  
          Object obj2 = new FindWithinGenerator<Object>(1);
          if (obj.equals(obj2)) {
              assertEquals("equals implies hash equals", obj.hashCode(), obj2.hashCode());
              assertEquals("equals must be symmetric", obj2, obj);
          } else {
              assertTrue("equals must be symmetric", !obj2.equals(obj));
          }
      }
  
      @Test
      public void testObjectEqualsWithNullDefault() throws Exception {
          Object obj = new FindWithinGenerator<Object>(null);
          assertEquals("equals must be reflexive", obj, obj);
          assertEquals("hashCode must be reflexive", obj.hashCode(), obj.hashCode());
          assertTrue(!obj.equals(null)); // should be able to compare to null
  
          Object obj2 = new FindWithinGenerator<Object>(null);
          if (obj.equals(obj2)) {
              assertEquals("equals implies hash equals", obj.hashCode(), obj2.hashCode());
              assertEquals("equals must be symmetric", obj2, obj);
          } else {
              assertTrue("equals must be symmetric", !obj2.equals(obj));
          }
      }
  
      @Test
      public void testEquals() {
          FindWithinGenerator<Object> f = new FindWithinGenerator<Object>();
          assertEquals(f, f);
  
          assertObjectsAreEqual(f, new FindWithinGenerator<Object>());
          assertObjectsAreEqual(new FindWithinGenerator<Object>(Double.valueOf(0)), new FindWithinGenerator<Object>(
              Double.valueOf(0)));
          assertObjectsAreNotEqual(f, new FindWithinGenerator<Object>(Integer.valueOf(0)));
      }
  
      @Test(expected = NoSuchElementException.class)
      public void testDetect() {
          assertEquals(Integer.valueOf(3), new FindWithinGenerator<Integer>().evaluate(
              IteratorToGeneratorAdapter.adapt(numbers.iterator()), equalsThree));
          new FindWithinGenerator<Integer>().evaluate(IteratorToGeneratorAdapter.adapt(numbers.iterator()),
              equalsTwentyThree);
      }
  
      @Test
      public void testDetectIfNone() {
          assertEquals(
              Integer.valueOf(3),
              new FindWithinGenerator<Integer>(Integer.valueOf(3)).evaluate(
                 IteratorToGeneratorAdapter.adapt(numbers.iterator()), equalsThree));
         assertEquals("Xyzzy", new FindWithinGenerator<String>("Xyzzy").evaluate(
             IteratorToGeneratorAdapter.adapt(strings.iterator()), equalsXyZ));
     }
 
     @Test
     public void testInstance() {
         assertNotNull("FindWithinGenerator instance must not be null", FindWithinGenerator.instance());
     }
 
     // Attributes
     // ------------------------------------------------------------------------
 
     private List<Integer> numbers = Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7, 8, 9);
     private List<String> strings = Arrays.asList("Zyx", "xxyZ");
     private Predicate<Integer> equalsThree = LeftBoundPredicate.bind(IsEqual.instance(), Integer.valueOf(3));
     private Predicate<Integer> equalsTwentyThree = LeftBoundPredicate.bind(IsEqual.instance(), Integer.valueOf(23));
     private Predicate<String> equalsXyZ = LeftBoundPredicate.bind(IsEqual.instance(), "xyZ");
 
 }