/**
   * Merge changes from the source to the target object. Make the necessary removals and adds and
   * map key modifications.
   */
  private void mergeChangesIntoObjectWithoutOrder(
      Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager) {
    EISCollectionChangeRecord sdkChangeRecord = (EISCollectionChangeRecord) changeRecord;
    ContainerPolicy cp = this.getContainerPolicy();
    AbstractSession session = mergeManager.getSession();

    Object targetCollection = null;
    if (sdkChangeRecord.getOwner().isNew()) {
      targetCollection = cp.containerInstance(sdkChangeRecord.getAdds().size());
    } else {
      targetCollection = this.getRealCollectionAttributeValueFromObject(target, session);
    }

    Vector removes = sdkChangeRecord.getRemoves();
    Vector adds = sdkChangeRecord.getAdds();
    Vector changedMapKeys = sdkChangeRecord.getChangedMapKeys();

    synchronized (targetCollection) {
      for (Enumeration stream = removes.elements(); stream.hasMoreElements(); ) {
        Object removeElement =
            this.buildRemovedElementFromChangeSet(stream.nextElement(), mergeManager);

        Object targetElement = null;
        for (Object iter = cp.iteratorFor(targetCollection); cp.hasNext(iter); ) {
          targetElement = cp.next(iter, session);
          if (this.compareElements(targetElement, removeElement, session)) {
            break; // matching element found - skip the rest of them
          }
        }
        if (targetElement != null) {
          // a matching element was found, remove it
          cp.removeFrom(targetElement, targetCollection, session);
        }
      }

      for (Enumeration stream = adds.elements(); stream.hasMoreElements(); ) {
        Object addElement = this.buildAddedElementFromChangeSet(stream.nextElement(), mergeManager);
        cp.addInto(addElement, targetCollection, session);
      }

      for (Enumeration stream = changedMapKeys.elements(); stream.hasMoreElements(); ) {
        Object changedMapKeyElement =
            this.buildAddedElementFromChangeSet(stream.nextElement(), mergeManager);
        Object originalElement =
            ((UnitOfWorkImpl) session).getOriginalVersionOfObject(changedMapKeyElement);
        cp.removeFrom(originalElement, targetCollection, session);
        cp.addInto(changedMapKeyElement, targetCollection, session);
      }
    }

    // reset the attribute to allow for set method to re-morph changes if the collection is not
    // being stored directly
    this.setRealAttributeValueInObject(target, targetCollection);
  }
  /** Compare the attributes. Return true if they are alike. Ignore the order of the elements. */
  private boolean compareAttributeValuesWithoutOrder(
      Object collection1, Object collection2, AbstractSession session) {
    ContainerPolicy cp = this.getContainerPolicy();

    Vector vector2 = cp.vectorFor(collection2, session); // "clone" it so we can clear out the slots

    for (Object iter1 = cp.iteratorFor(collection1); cp.hasNext(iter1); ) {
      Object element1 = cp.next(iter1, session);

      boolean found = false;
      for (int i = 0; i < vector2.size(); i++) {
        if (this.compareElements(element1, vector2.elementAt(i), session)) {
          found = true;
          vector2.setElementAt(XXX, i); // clear out the matching element
          break; // matching element found - skip the rest of them
        }
      }
      if (!found) {
        return false;
      }
    }

    // look for elements that were not in collection1
    for (Enumeration stream = vector2.elements(); stream.hasMoreElements(); ) {
      if (stream.nextElement() != XXX) {
        return false;
      }
    }
    return true;
  }
  /**
   * Merge changes from the source to the target object. Simply replace the entire target
   * collection.
   */
  private void mergeChangesIntoObjectWithOrder(
      Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager) {
    ContainerPolicy cp = this.getContainerPolicy();
    AbstractSession session = mergeManager.getSession();

    Vector changes = ((EISOrderedCollectionChangeRecord) changeRecord).getNewCollection();
    Object targetCollection = cp.containerInstance(changes.size());

    for (Enumeration stream = changes.elements(); stream.hasMoreElements(); ) {
      Object targetElement =
          this.buildAddedElementFromChangeSet(stream.nextElement(), mergeManager);
      cp.addInto(targetElement, targetCollection, session);
    }

    // reset the attribute to allow for set method to re-morph changes if the collection is not
    // being stored directly
    this.setRealAttributeValueInObject(target, targetCollection);
  }
Пример #4
0
  /** INTERNAL: Conform the result if specified. */
  protected Object conformResult(
      Object result,
      UnitOfWorkImpl unitOfWork,
      AbstractRecord arguments,
      boolean buildDirectlyFromRows) {
    if (getSelectionCriteria() != null) {
      ExpressionBuilder builder = getSelectionCriteria().getBuilder();
      builder.setSession(unitOfWork.getRootSession(null));
      builder.setQueryClass(getReferenceClass());
    }

    // If the query is redirected then the collection returned might no longer
    // correspond to the original container policy.  CR#2342-S.M.
    ContainerPolicy cp;
    if (getRedirector() != null) {
      cp = ContainerPolicy.buildPolicyFor(result.getClass());
    } else {
      cp = getContainerPolicy();
    }

    // This code is now a great deal different...  For one, registration is done
    // as part of conforming.  Also, this should only be called if one actually
    // is conforming.
    // First scan the UnitOfWork for conforming instances.
    // This will walk through the entire cache of registered objects.
    // Let p be objects from result not in the cache.
    // Let c be objects from cache.
    // Presently p intersect c = empty set, but later p subset c.
    // By checking cache now doesConform will be called p fewer times.
    Map indexedInterimResult =
        unitOfWork.scanForConformingInstances(
            getSelectionCriteria(), getReferenceClass(), arguments, this);

    Cursor cursor = null;
    // In the case of cursors just conform/register the initially read collection.
    if (cp.isCursorPolicy()) {
      cursor = (Cursor) result;
      cp = ContainerPolicy.buildPolicyFor(ClassConstants.Vector_class);
      // In nested UnitOfWork session might have been session of the parent.
      cursor.setSession(unitOfWork);
      result = cursor.getObjectCollection();
      // for later incremental conforming...
      cursor.setInitiallyConformingIndex(indexedInterimResult);
      cursor.setSelectionCriteriaClone(getSelectionCriteria());
      cursor.setTranslationRow(arguments);
    }

    // Now conform the result from the database.
    // Remove any deleted or changed objects that no longer conform.
    // Deletes will only work for simple queries, queries with or's or anyof's may not return
    // correct results when untriggered indirection is in the model.
    Vector fromDatabase = null;

    // When building directly from rows, one of the performance benefits
    // is that we no longer have to wrap and then unwrap the originals.
    // result is just a vector, not a container of wrapped originals.
    if (buildDirectlyFromRows) {
      Vector rows = (Vector) result;
      fromDatabase = new Vector(rows.size());
      for (int i = 0; i < rows.size(); i++) {
        Object object = rows.elementAt(i);
        // null is placed in the row collection for 1-m joining to filter duplicate rows.
        if (object != null) {
          Object clone =
              conformIndividualResult(
                  object,
                  unitOfWork,
                  arguments,
                  getSelectionCriteria(),
                  indexedInterimResult,
                  buildDirectlyFromRows);
          if (clone != null) {
            fromDatabase.addElement(clone);
          }
        }
      }
    } else {
      fromDatabase = new Vector(cp.sizeFor(result));
      AbstractSession sessionToUse = unitOfWork.getParent();
      for (Object iter = cp.iteratorFor(result); cp.hasNext(iter); ) {
        Object object = cp.next(iter, sessionToUse);
        Object clone =
            conformIndividualResult(
                object,
                unitOfWork,
                arguments,
                getSelectionCriteria(),
                indexedInterimResult,
                buildDirectlyFromRows);
        if (clone != null) {
          fromDatabase.addElement(clone);
        }
      }
    }

    // Now add the unwrapped conforming instances into an appropriate container.
    // Wrapping is done automatically.
    // Make sure a vector of exactly the right size is returned.
    Object conformedResult =
        cp.containerInstance(indexedInterimResult.size() + fromDatabase.size());
    Object eachClone;
    for (Iterator enumtr = indexedInterimResult.values().iterator(); enumtr.hasNext(); ) {
      eachClone = enumtr.next();
      cp.addInto(eachClone, conformedResult, unitOfWork);
    }
    for (Enumeration enumtr = fromDatabase.elements(); enumtr.hasMoreElements(); ) {
      eachClone = enumtr.nextElement();
      cp.addInto(eachClone, conformedResult, unitOfWork);
    }

    if (cursor != null) {
      cursor.setObjectCollection((Vector) conformedResult);

      // For nested UOW must copy all in object collection to
      // initiallyConformingIndex, as some of these could have been from
      // the parent UnitOfWork.
      if (unitOfWork.isNestedUnitOfWork()) {
        for (Enumeration enumtr = cursor.getObjectCollection().elements();
            enumtr.hasMoreElements(); ) {
          Object clone = enumtr.nextElement();
          indexedInterimResult.put(clone, clone);
        }
      }
      return cursor;
    } else {
      return conformedResult;
    }
  }