C++ Ptr::isNull方法代码示例

Item::Ptr UTransform::TransformResult::next(DynamicContext *context)
{
    context->testInterrupt();

    AutoVariableStoreReset reset(context, &scope_);

    if(toDo_) {
        toDo_ = false;

        NodeSet copiedNodes = NodeSet(nodecompare(context));

        VectorOfCopyBinding::const_iterator end = transform_->getBindings()->end();
        for(VectorOfCopyBinding::const_iterator it = transform_->getBindings()->begin();
                it != end; ++it) {
            if((*it)->qname_ == 0) continue;

            Sequence values = (*it)->expr_->createResult(context)->toSequence(context);

            // Keep a record of the nodes that have been copied
            Result valIt = values;
            Item::Ptr val;
            while((val = valIt->next(context)).notNull()) {
                copiedNodes.insert((Node*)val.get());
            }

            scope_.setVar((*it)->uri_, (*it)->name_, values);
        }

        // Get the pending update list
        PendingUpdateList pul = transform_->getModifyExpr()->createUpdateList(context);

        // Check that the targets of the pending updates are copied nodes
        for(PendingUpdateList::const_iterator i = pul.begin(); i != pul.end(); ++i) {
            Node::Ptr target = i->getTarget();
            while(copiedNodes.find(target) == copiedNodes.end()) {
                target = target->dmParent(context);
                if(target.isNull()) {
                    XQThrow3(StaticErrorException,X("UTransform::staticTyping"),
                             X("The target node of an update expression in the transform expression is not a node from the copy clauses [err:XUDY0014]"), &(*i));
                }
            }
        }

        // Apply the updates
        AutoDelete<UpdateFactory> ufactory(context->createUpdateFactory());
        ufactory->applyUpdates(pul, context, transform_->getRevalidationMode());

        // Execute the return expression
        result_ = transform_->getReturnExpr()->createResult(context);
    }

    Item::Ptr result = result_->next(context);

    if(result.isNull()) {
        result_ = 0;
        return 0;
    }

    return result;
}

Sequence FunctionBaseURI::createSequence(DynamicContext* context, int flags) const
{
  Node::Ptr node = (Node*)getParamNumber(1, context)->next(context).get();
  if(node.isNull()) return Sequence(context->getMemoryManager());
  return node->dmBaseURI(context);
}

bool SequenceType::ItemType::matches(const Node::Ptr &toBeTested, DynamicContext* context) const
{
  switch(m_nTestType) {
    case TEST_ELEMENT:
    {
      if(toBeTested->dmNodeKind() != Node::element_string)
        return false;

      if(!matchesNameType(toBeTested, context))
        return false;

      // if the element has xsi:nil="true", m_bAllowNil MUST be true
      if(toBeTested->dmNilled(context)->isTrue() && !m_bAllowNil)
        return false;

      return true;
    }

    case TEST_ATTRIBUTE:
    {
      if(toBeTested->dmNodeKind() != Node::attribute_string)
        return false;
      if(!matchesNameType(toBeTested, context))
        return false;
      return true;
    }

    case TEST_SCHEMA_ELEMENT:
    {
      if(toBeTested->dmNodeKind() != Node::element_string)
        return false;

      return matchesSchemaElement(toBeTested, context);
    }

    case TEST_SCHEMA_ATTRIBUTE:
    {
      if(toBeTested->dmNodeKind() != Node::attribute_string)
        return false;

      // retrieve the type of the attribute name
      assert(m_pName!=NULL);
      const XMLCh* attributeNS=m_NameURI;
      const XMLCh* attributeName=m_pName->getName();
      SchemaAttDef* attrDecl=context->getDocumentCache()->getAttributeDecl(attributeNS, attributeName);
      assert(attrDecl != NULL);

      // 1. The name of the candidate node matches the specified AttributeName
      ATQNameOrDerived::Ptr name = toBeTested->dmNodeName(context);
      if(name.isNull()) return false;
      const XMLCh *node_uri = ((const ATQNameOrDerived*)name.get())->getURI();
      const XMLCh *node_name = ((const ATQNameOrDerived*)name.get())->getName();

      if(!(XPath2Utils::equals(attributeName, node_name)) ||
         !(XPath2Utils::equals(attributeNS, node_uri)))
        return false;

      // 2. derives-from(AT, ET) is true, where AT is the type of the candidate node and ET is the type declared 
      //    for attribute AttributeName in the in-scope attribute declarations.
      DatatypeValidator* pDV=attrDecl->getDatatypeValidator();
      if(pDV && !toBeTested->hasInstanceOfType(pDV->getTypeUri(), pDV->getTypeLocalName(), context))
        return false;

      return true;
    }

    case TEST_PI:
    {
      if(toBeTested->dmNodeKind() != Node::processing_instruction_string)
        return false;
      if(!matchesNameType(toBeTested, context))
        return false;
      return true;
    }

    case TEST_COMMENT:
    {
      return (toBeTested->dmNodeKind() == Node::comment_string);
    }

    case TEST_TEXT:
    {
      return (toBeTested->dmNodeKind() == Node::text_string);
    }

    case TEST_SCHEMA_DOCUMENT:
    case TEST_DOCUMENT:
    {
        if(toBeTested->dmNodeKind() != Node::document_string)
          return false;

        if(m_pName == NULL && m_pType == NULL)
          return true;

        // if we have a constraint on name/type, they apply to the document element
        Result children = toBeTested->dmChildren(context, 0);
        Node::Ptr docElement;
        while((docElement = children->next(context)).notNull() &&
              docElement->dmNodeKind() != Node::element_string) {}

//.........这里部分代码省略.........