Examples of org.eclipse.core.internal.dtree.DeltaDataTree

org.eclipse.core.internal.dtree.DeltaDataTree

Externally, a DeltaDataTree appears to have the same content as a standard data tree. Internally, the delta tree may be complete, or it may just indicate the changes between itself and its parent.

Nodes that exist in the parent but do not exist in the delta, are represented as instances of DeletedNode. Nodes that are identical in the parent and the delta, but have differences in their subtrees, are represented as instances of NoDataDeltaNode in the delta tree. Nodes that differ between parent and delta are instances of DataDeltaNode. However, the DataDeltaNode only contains the children whose subtrees differ between parent and delta. A delta tree algebra is used to manipulate sets of delta trees. Given two trees, one can obtain the delta between the two using the method forwardDeltaWith(aTree). Given a tree and a delta, one can assemble the complete tree that the delta represents using the method assembleWithForwardDelta. Refer to the public API methods of this class for further details.

  /**
   * Reads an element tree delta from the input stream, and
   * reconstructs it as a delta on the given tree.
   */
  public ElementTree readDelta(ElementTree parentTree, DataInput input) throws IOException {
    DeltaDataTree complete = parentTree.getDataTree();
    DeltaDataTree delta = dataTreeReader.readTree(complete, input);


    //if the delta is empty, just return the parent
    if (delta.isEmptyDelta())
      return parentTree;


    ElementTree tree = new ElementTree(delta);


    //copy the user data forward
    IElementTreeData data = parentTree.getTreeData();
    if (data != null) {
      tree.setTreeData((IElementTreeData) data.clone());
    }


    //make the underlying data tree immutable
    //can't call immutable() on the ElementTree because
    //this would attempt to reroot.
    delta.immutable();
    return tree;
  }

   */
  public static ResourceDelta computeDelta(Workspace workspace, ElementTree oldTree, ElementTree newTree, IPath root, long markerGeneration) {
    //compute the underlying delta tree.
    ResourceComparator comparator = markerGeneration >= 0 ? ResourceComparator.getNotificationComparator() : ResourceComparator.getBuildComparator();
    newTree.immutable();
    DeltaDataTree delta = null;
    if (Path.ROOT.equals(root))
      delta = newTree.getDataTree().compareWith(oldTree.getDataTree(), comparator);
    else
      delta = newTree.getDataTree().compareWith(oldTree.getDataTree(), comparator, root);


    delta = delta.asReverseComparisonTree(comparator);
    IPath pathInTree = root.isRoot() ? Path.ROOT : root;
    IPath pathInDelta = Path.ROOT;


    // get the marker deltas for the delta info object....if needed
    Map allMarkerDeltas = null;

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