Examples of de.danielbechler.diff.node.DiffNode

de.danielbechler.diff.node.DiffNode
Represents a part of an object. It could be the object itself, one of its properties, an item in a collection or a map entry. A node may have one parent node and any number of children. It also provides methods to read and write the property represented by this node on any object of the same type as the original object. Last but not least, a node knows how the associated property has changed compared to the base object. @author Daniel Bechler

  }


  @Test(expectedExceptions = IllegalArgumentException.class)
  public void testAssertThat_node_has_children_with_negative_count_throws_IllegalArgumentException()
  {
    final DiffNode node = new DiffNode(String.class);
    assertThat(node).root().hasChildren(-1);
  }

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  }


  @Test
  public void testAssertThat_node_has_changed_state_succeeds_when_node_has_changed()
  {
    final DiffNode node = new DiffNode(String.class);
    node.setState(DiffNode.State.CHANGED);
    assertThat(node).root().hasState(DiffNode.State.CHANGED);
  }

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  }


  @Test(expectedExceptions = AssertionError.class)
  public void testAssertThat_node_has_changed_state_fails_when_node_has_different_state()
  {
    final DiffNode node = new DiffNode(String.class);
    node.setState(DiffNode.State.UNTOUCHED);
    assertThat(node).root().hasState(DiffNode.State.CHANGED);
  }

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  @SuppressWarnings({"unchecked"})
  public <T> T merge(final T modified, final T base, final T head)
  {
    final DiffNode.Visitor visitor = new MergingDifferenceVisitor<T>(head, modified);
    final DiffNode difference = objectDiffer.compare(modified, base);
    difference.visit(visitor);
    return head;
  }

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  @Test
  public void return_untouched_node_if_working_and_base_are_null()
  {
    when(instances.areNull()).thenReturn(true);


    final DiffNode node = beanDiffer.compare(DiffNode.ROOT, instances);


    assertThat(node).self().isUntouched();
  }

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  @Test
  public void return_added_node_if_working_is_not_null_and_base_is()
  {
    when(instances.hasBeenAdded()).thenReturn(true);


    final DiffNode node = beanDiffer.compare(DiffNode.ROOT, instances);


    assertThat(node.getState(), is(DiffNode.State.ADDED));
  }

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  @Test
  public void return_removed_node_if_working_is_null_and_base_is_not()
  {
    when(instances.hasBeenRemoved()).thenReturn(true);


    final DiffNode node = beanDiffer.compare(DiffNode.ROOT, instances);


    assertThat(node.getState(), is(DiffNode.State.REMOVED));
  }

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  @Test
  public void return_untouched_node_if_working_and_base_are_the_same_instance()
  {
    when(instances.areNull()).thenReturn(true);


    final DiffNode node = beanDiffer.compare(DiffNode.ROOT, instances);


    assertThat(node).self().isUntouched();
  }

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  @Test
  public void delegate_comparison_of_properties_when_comparing_via_introspector()
  {
    given_root_node_is_introspectable();
    final PropertyAwareAccessor propertyAccessor = given_introspector_returns_PropertyAccessor("foo");
    final DiffNode propertyNode = given_DifferDispatcher_returns_Node_for_PropertyAccessor(propertyAccessor);
    given_Node_is_returnable(propertyNode);


    final DiffNode node = beanDiffer.compare(DiffNode.ROOT, instances);


    Assertions.assertThat(node.getChild("foo")).isSameAs(propertyNode);
  }

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    return propertyAccessor;
  }


  private DiffNode given_DifferDispatcher_returns_Node_for_PropertyAccessor(final PropertyAwareAccessor propertyAccessor)
  {
    final DiffNode propertyNode = new DiffNode(propertyAccessor, String.class);
    doReturn(propertyNode).when(differDispatcher)
        .dispatch(any(DiffNode.class), any(Instances.class), same(propertyAccessor));
    return propertyNode;
  }

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Related Classes of de.danielbechler.diff.node.DiffNode

de.danielbechler.diff.differ.BeanDiffer

de.danielbechler.diff.differ.BeanDifferShould

de.danielbechler.diff.differ.CollectionDiffer

de.danielbechler.diff.differ.DifferDispatcher

de.danielbechler.diff.differ.DifferDispatcherShould

de.danielbechler.diff.differ.MapDiffer

de.danielbechler.diff.differ.PrimitiveDiffer

de.danielbechler.diff.differ.PrimitiveDifferTest

de.danielbechler.diff.example.CanonicalAccessorExample

de.danielbechler.diff.example.EqualsOnlyValueProviderMethodExample

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