/**
   * Build and return the change record that results from comparing the two collection attributes.
   * The order of the elements is significant.
   */
  private ChangeRecord compareAttributeValuesForChangeWithOrder(
      Object cloneCollection,
      Object backupCollection,
      ObjectChangeSet owner,
      AbstractSession session) {
    ContainerPolicy cp = this.getContainerPolicy();

    Vector cloneVector =
        cp.vectorFor(
            cloneCollection,
            session); // convert it to a Vector so we can preserve the order and use indexes
    Vector backupVector =
        cp.vectorFor(backupCollection, session); // "clone" it so we can clear out the slots

    EISOrderedCollectionChangeRecord changeRecord =
        new EISOrderedCollectionChangeRecord(
            owner, this.getAttributeName(), this.getDatabaseMapping());

    for (int i = 0; i < cloneVector.size(); i++) {
      Object cloneElement = cloneVector.elementAt(i);
      boolean found = false;
      for (int j = 0; j < backupVector.size(); j++) {
        if (this.compareElementsForChange(cloneElement, backupVector.elementAt(j), session)) {
          // the clone element was found in the backup collection
          found = true;
          backupVector.setElementAt(XXX, j); // clear out the matching backup element

          changeRecord.addMovedChangeSet(this.buildChangeSet(cloneElement, owner, session), j, i);
          break; // matching backup element found - skip the rest of them
        }
      }
      if (!found) {
        // the clone element was not found, so it must have been added
        changeRecord.addAddedChangeSet(this.buildChangeSet(cloneElement, owner, session), i);
      }
    }

    for (int i = 0; i < backupVector.size(); i++) {
      Object backupElement = backupVector.elementAt(i);
      if (backupElement != XXX) {
        // the backup element was not in the clone collection, so it must have been removed
        changeRecord.addRemovedChangeSet(this.buildChangeSet(backupElement, owner, session), i);
      }
    }

    if (changeRecord.hasChanges()) {
      return changeRecord;
    } else {
      return null;
    }
  }
  /**
   * Build and return the change record that results from comparing the two collection attributes.
   * Ignore the order of the elements.
   */
  private ChangeRecord compareAttributeValuesForChangeWithoutOrder(
      Object cloneCollection,
      Object backupCollection,
      ObjectChangeSet owner,
      AbstractSession session) {
    ContainerPolicy cp = this.getContainerPolicy();

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

    EISCollectionChangeRecord changeRecord =
        new EISCollectionChangeRecord(owner, this.getAttributeName(), this.getDatabaseMapping());
    for (Object cloneIter = cp.iteratorFor(cloneCollection); cp.hasNext(cloneIter); ) {
      Object cloneElement = cp.next(cloneIter, session);

      boolean found = false;
      for (int i = 0; i < backupVector.size(); i++) {
        if (this.compareElementsForChange(cloneElement, backupVector.elementAt(i), session)) {
          // the clone element was found in the backup collection
          found = true;
          backupVector.setElementAt(XXX, i); // clear out the matching backup element
          if (this.mapKeyHasChanged(cloneElement, session)) {
            changeRecord.addChangedMapKeyChangeSet(
                this.buildChangeSet(cloneElement, owner, session));
          }
          break; // matching backup element found - skip the rest of them
        }
      }
      if (!found) {
        // the clone element was not found, so it must have been added
        changeRecord.addAddedChangeSet(this.buildChangeSet(cloneElement, owner, session));
      }
    }

    for (int i = 0; i < backupVector.size(); i++) {
      Object backupElement = backupVector.elementAt(i);
      if (backupElement != XXX) {
        // the backup element was not in the clone collection, so it must have been removed
        changeRecord.addRemovedChangeSet(this.buildChangeSet(backupElement, owner, session));
      }
    }

    if (changeRecord.hasChanges()) {
      return changeRecord;
    } else {
      return null;
    }
  }
Пример #3
0
  /**
   * INTERNAL: This method is used when computing the nested queries for batch read mappings. It
   * recurses computing the nested mapping queries.
   */
  protected void computeNestedQueriesForBatchReadExpressions(Vector batchReadExpressions) {
    for (int index = 0; index < batchReadExpressions.size(); index++) {
      ObjectExpression objectExpression = (ObjectExpression) batchReadExpressions.get(index);

      // Expression may not have been initialized.
      ExpressionBuilder builder = objectExpression.getBuilder();
      builder.setSession(getSession().getRootSession(null));
      builder.setQueryClass(getReferenceClass());

      // PERF: Cache join attribute names.
      ObjectExpression baseExpression = objectExpression;
      while (!baseExpression.getBaseExpression().isExpressionBuilder()) {
        baseExpression = (ObjectExpression) baseExpression.getBaseExpression();
      }
      this.batchReadAttributes.add(baseExpression.getName());

      // Ignore nested
      if (objectExpression.getBaseExpression().isExpressionBuilder()) {
        DatabaseMapping mapping = objectExpression.getMapping();
        if ((mapping != null) && mapping.isForeignReferenceMapping()) {
          // A nested query must be built to pass to the descriptor that looks like the real query
          // execution would.
          ReadQuery nestedQuery = ((ForeignReferenceMapping) mapping).prepareNestedBatchQuery(this);
          // Register the nested query to be used by the mapping for all the objects.
          getBatchReadMappingQueries().put(mapping, nestedQuery);
        }
      }
    }
  }
  /** 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;
  }
Пример #5
0
 /** INTERNAL: Return if the attribute is specified for batch reading. */
 public boolean isAttributeBatchRead(String attributeName) {
   if (!hasBatchReadAttributes()) {
     return false;
   }
   Vector batchReadAttributeExpressions = getBatchReadAttributeExpressions();
   int size = batchReadAttributeExpressions.size();
   for (int index = 0; index < size; index++) {
     QueryKeyExpression expression = (QueryKeyExpression) batchReadAttributeExpressions.get(index);
     while (!expression.getBaseExpression().isExpressionBuilder()) {
       expression = (QueryKeyExpression) expression.getBaseExpression();
     }
     if (expression.getName().equals(attributeName)) {
       return true;
     }
   }
   return false;
 }
  /**
   * 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 #7
0
 /**
  * INTERNAL: The results are *not* in a cursor, build the collection. Cache the results in
  * temporaryCachedQueryResults.
  */
 protected Object executeNonCursor() throws DatabaseException {
   Vector rows = getQueryMechanism().executeSelect();
   Object results = null;
   if (this.resultType == MAP) {
     results = getContainerPolicy().buildContainerFromVector(rows, this.session);
   } else if (this.resultType == VALUE) {
     if (!rows.isEmpty()) {
       AbstractRecord record = (AbstractRecord) rows.get(0);
       // Use get with field for XML records.
       results = record.get(record.getFields().get(0));
       if (getValueConverter() != null) {
         results = getValueConverter().convertDataValueToObjectValue(results, this.session);
       }
     }
   } else {
     int size = rows.size();
     ContainerPolicy containerPolicy = getContainerPolicy();
     results = containerPolicy.containerInstance(size);
     if (containerPolicy.shouldAddAll()) {
       if (size > 0) {
         List values = new ArrayList(size);
         for (int index = 0; index < size; index++) {
           AbstractRecord row = (AbstractRecord) rows.get(index);
           Object value = buildObject(row);
           values.add(value);
         }
         containerPolicy.addAll(values, results, this.session, rows, this);
       }
     } else {
       for (int index = 0; index < size; index++) {
         AbstractRecord row = (AbstractRecord) rows.get(index);
         Object value = buildObject(row);
         containerPolicy.addInto(value, results, this.session, row, this);
       }
     }
   }
   // Bug 6135563 - cache DataReadQuery results verbatim, as ObjectBuilder is not invoked
   cacheResult(results);
   return results;
 }
Пример #8
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;
    }
  }