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

    assertThat(root).child("directReference", "value").hasState(DiffNode.State.CHANGED).hasNoChildren();
  }


  private static DiffNode compareAndPrint(final GraphNode modified, final GraphNode base)
  {
    final DiffNode root = ObjectDifferBuilder.buildDefault().compare(modified, base);
    if (PRINT_ENABLED)
    {
      root.visit(new PrintingVisitor(modified, base));
    }
    return root;
  }

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    final GraphNode modified = new GraphNode(1);
    final GraphNode modifiedA = new GraphNode(2, "ax");
    modified.setDirectReference(modifiedA);


    final DiffNode root = compareAndPrint(modified, base);


    assertThat(root).root().hasChildren(1);
    assertThat(root).child("directReference", "value").hasState(DiffNode.State.CHANGED).hasNoChildren();
  }

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    final GraphNode modifiedA = new GraphNode(2, "ax");
    final GraphNode modifiedB = new GraphNode(3, "by");
    modified.addChildren(modifiedA, modifiedB);
    establishCircularDirectReference(modifiedA, modifiedB);


    final DiffNode root = compareAndPrint(modified, base);


    assertThat(root).root().hasChildren(1);
    assertThat(root).child("children").hasChildren(2);
    assertThat(root).child(startBuilding()
        .propertyName("children")

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    modified.addChild(modifiedB);
    establishCircularDirectReference(modifiedA, modifiedB);
    modifiedA.getMap().put("node-b", modifiedB);
    modifiedB.getMap().put("node-a", modifiedA);


    final DiffNode root = compareAndPrint(modified, base);


    /*
     * one could assume that this node would be marked as removed, but since the instance it represents
     * is a parent of it, we cannot reliably test, whether the node has been changed. (added or removed
     * is easier, but since changed is not yet possible, that would be inconsistent)

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    final GraphNode modifiedA = new GraphNode(1, "ax");
    final GraphNode modifiedB = new GraphNode(2, "by");
    establishCircularDirectReference(modifiedA, modifiedB);


    final DiffNode root = compareAndPrint(modifiedA, a);


    assertThat(root).child("directReference", "value").hasState(DiffNode.State.CHANGED).hasNoChildren();
    assertThat(root).child("value").hasState(DiffNode.State.CHANGED).hasNoChildren();
  }

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    final GraphNode modified = new GraphNode("modified");
    final GraphNode modifiedA = new GraphNode("ax");
    modified.setDirectReference(modifiedA);


    final DiffNode root = compareAndPrint(modified, base);


    assertThat(root).child("directReference", "value").hasState(DiffNode.State.CHANGED).hasNoChildren();
    assertThat(root).child("value").hasState(DiffNode.State.CHANGED).hasNoChildren();
  }

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    final GraphNode modifiedA = new GraphNode("a");
    final GraphNode modifiedB = new GraphNode("bx");
    modified.getChildren().add(modifiedA);
    modified.getChildren().add(modifiedB);


    final DiffNode root = compareAndPrint(modified, base);


    NodeAssertions.assertThat(root).root().hasState(DiffNode.State.UNTOUCHED); // not a bug!


    // NOTE: This is expected, since Collections (and java-object-diff) rely heavily on the proper
    // implementation of hashCode and equals. The GraphNode uses the ID as sole criteria in it's

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    final GraphNode modifiedB = new GraphNode(3, "by");
    final GraphNode modified = new GraphNode(1);
    modified.addChild(modifiedA);
    modified.addChild(modifiedB);


    final DiffNode root = compareAndPrint(modified, base);


    NodeAssertions.assertThat(root).child(startBuilding()
        .propertyName("children")
        .collectionItem(a))
        .hasState(DiffNode.State.CHANGED)

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    establishParentChildRelationship(base, a);
    final GraphNode modified = new GraphNode(1);
    final GraphNode modifiedA = new GraphNode(2, "ax");
    establishParentChildRelationship(modified, modifiedA);


    final DiffNode root = compareAndPrint(modified, base);


    NodeAssertions.assertThat(root).child(startBuilding()
        .propertyName("children")
        .collectionItem(modifiedA)
        .propertyName("value"))

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    establishParentChildRelationship(base, a);
    final GraphNode modified = new GraphNode(1);
    final GraphNode modifiedA = new GraphNode(2, "a");
    establishParentChildRelationship(modified, modifiedA);


    final DiffNode root = compareAndPrint(modified, base);


    assertThat(root).root().hasState(DiffNode.State.UNTOUCHED);
  }

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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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