Examples of org.eclipse.jface.viewers.TreePath

org.eclipse.jface.viewers.TreePath
A tree path denotes a model element in a tree viewer. Tree path objects have value semantics. A model element is represented by a path of elements in the tree from the root element to the leaf element.
Clients may instantiate this class. Not intended to be subclassed.
@since 3.2


  private TreePathContentProvider content;


  @Before
  public void before() {
    TreePath path1 = new TreePath(new Object[]{"1", "2", "3"});
    TreePath path2 = new TreePath(new Object[]{"a", "b"});
    ITreePathBuilder builder = mock(ITreePathBuilder.class);
    when(builder.build(any())).thenReturn(Arrays.asList(path1, path2));
    content = create(builder);


    // Call once to initialize:

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  }


  @Test
  public void getChildrenShouldReturnAnEmptyArrayIfParentHasNoChildren() {
    // Given a non-null parent has no children:
    TreePath parent = new TreePath(new Object[]{this});


    // When asking for the children of the parent:
    Object[] children = content.getChildren(parent);


    // The an empty array is returned:

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  }


  @Test
  public void getChildrenShouldReturnAnEmtpyArrayIfParentIsNull() {
    // Given a parent path is null:
    TreePath parent = null;


    // When asking for the children of the null object:
    Object[] children = content.getChildren(parent);


    // The an empty array should be returned as the children:

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  }


  @Test
  public void getChildrenShouldReturnTheDistinctChildrenOfAParent() {
    // Given a tree path has 3 children, 2 of which are equal:
    TreePath branch = new TreePath(new Object[]{0, 1});
    TreePath leaf1 = branch.createChildPath(2);
    TreePath leaf2 = branch.createChildPath(3);
    TreePath leaf3 = branch.createChildPath(3);
    Object input = new Object();


    ITreePathBuilder builder = mock(ITreePathBuilder.class);
    given(builder.build(input)).willReturn(asList(leaf1, leaf2, leaf3));
    content = create(builder);


    // When asking for the children of the parent path:
    content.inputChanged(null, null, input); // Sets the input.
    List<Object> children = newArrayList(content.getChildren(branch));


    // Then the distinct children should be returned:
    List<Object> expected = newArrayList(newHashSet( // Get unique children
        leaf1.getLastSegment(),
        leaf2.getLastSegment(),
        leaf3.getLastSegment()));
    assertThat(children, is(equalTo(expected)));
  }

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  public void getElementsShouldReturnAnEmptyArrayIfAllLeavesAreEmptyPaths() {
    // Given all tree paths are empty paths:
    Object input = new Object();
    ITreePathBuilder builder = mock(ITreePathBuilder.class);
    given(builder.build(input)).willReturn(
        asList(TreePath.EMPTY, new TreePath(new Object[0])));
    content = create(builder);


    // When set and ask for elements:
    content.inputChanged(null, null, input);
    Object[] elements = content.getElements(input);

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  }


  @Test
  public void getElementsShouldReturnTheDistinctElementsOfAllLeaves() {
    // Given we have 3 leaves, the 0th segments of 2 of them are equal::
    TreePath leaf1 = new TreePath(new Object[]{0, 1});
    TreePath leaf2 = new TreePath(new Object[]{2, 3});
    TreePath leaf3 = new TreePath(new Object[]{9, 8});
    Object input = new Object();


    ITreePathBuilder builder = mock(ITreePathBuilder.class);
    given(builder.build(input)).willReturn(asList(leaf1, leaf2, leaf3));
    content = create(builder);


    // When asking for elements of the new input:
    content.inputChanged(null, null, input);
    List<Object> actual = newArrayList(content.getElements(input));


    // Then the distinct first elements of each leave is returned:
    List<Object> expected = newArrayList(newHashSet( // Get distinct elements
        leaf1.getFirstSegment(),
        leaf2.getFirstSegment(),
        leaf3.getFirstSegment()));
    assertThat(actual, is(equalTo(expected)));
  }

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  @Test
  public void getParentsShouldReturnTheParentsOfAChild() {
    // Given we have two leaves that have the same last segments:
    Object child = "Child";
    TreePath leaf1 = new TreePath(new Object[]{0, child});
    TreePath leaf2 = new TreePath(new Object[]{2, child});


    ITreePathBuilder builder = mock(ITreePathBuilder.class);
    given(builder.build("input")).willReturn(asList(leaf1, leaf2));
    content = create(builder);


    // When getting the parents of the child:
    content.inputChanged(null, null, "input");
    Set<TreePath> actual = newHashSet(content.getParents(child));


    // Then the parent path of the two leaves should be returned:e
    Set<TreePath> expected = newHashSet(
        leaf1.getParentPath(),
        leaf2.getParentPath());
    assertThat(actual, is(expected));
  }

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    assertThat(create(mock(ITreePathBuilder.class)).get().isEmpty(), is(true));
  }


  @Test(expected = UnsupportedOperationException.class)
  public void getShouldReturnAnImmutableCollection() {
    content.get().add(new TreePath(new Object[]{}));
  }

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  }


  @Test
  public void getShouldReturnTheTreePathsCurrentlyInUse() {
    List<TreePath> paths = Lists.newArrayList();
    paths.add(new TreePath(new Object[]{}));
    paths.add(new TreePath(new Object[]{"a", "b"}));


    ITreePathBuilder builder = mock(ITreePathBuilder.class);
    given(builder.build(any())).willReturn(paths);
    content = create(builder);
    content.inputChanged(null, null, null);

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  }


  @Test
  public void hasChildrenShouldReturnFalseIfTheGivenPathHasNoChildren() {
    // Given a non-null parent has no children:
    TreePath parent = new TreePath(new Object[]{this});


    // When asking whether the parent has children or not:
    boolean hasChildren = content.hasChildren(parent);


    // Then false is returned:

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