Java Axis.ROOT属性代码示例

/**
 * This is a shortcut to the iterators that implement the
 * supported XPath axes (only namespace::) is not supported.
 * Returns a bare-bones iterator that must be initialized
 * with a start node (using iterator.setStartNode()).
 */
public DTMAxisIterator getAxisIterator(final int axis)
{
    switch (axis)
    {
        case Axis.SELF:
            return new SingletonIterator();
        case Axis.CHILD:
            return new ChildrenIterator();
        case Axis.PARENT:
            return new ParentIterator();
        case Axis.ANCESTOR:
            return new AncestorIterator();
        case Axis.ANCESTORORSELF:
            return (new AncestorIterator()).includeSelf();
        case Axis.ATTRIBUTE:
            return new AttributeIterator();
        case Axis.DESCENDANT:
            return new DescendantIterator();
        case Axis.DESCENDANTORSELF:
            return (new DescendantIterator()).includeSelf();
        case Axis.FOLLOWING:
            return new FollowingIterator();
        case Axis.PRECEDING:
            return new PrecedingIterator();
        case Axis.FOLLOWINGSIBLING:
            return new FollowingSiblingIterator();
        case Axis.PRECEDINGSIBLING:
            return new PrecedingSiblingIterator();
        case Axis.NAMESPACE:
            return new NamespaceIterator();
        case Axis.ROOT:
            return new RootIterator();
        default:
            BasisLibrary.runTimeError(BasisLibrary.AXIS_SUPPORT_ERR,
                    Axis.getNames(axis));
    }
    return null;
}
 

/**
 * Similar to getAxisIterator, but this one returns an iterator
 * containing nodes of a typed axis (ex.: child::foo)
 */
public DTMAxisIterator getTypedAxisIterator(int axis, int type)
{
    // Most common case handled first
    if (axis == Axis.CHILD) {
        return new TypedChildrenIterator(type);
    }

    if (type == NO_TYPE) {
        return(EMPTYITERATOR);
    }

    switch (axis)
    {
        case Axis.SELF:
            return new TypedSingletonIterator(type);
        case Axis.CHILD:
            return new TypedChildrenIterator(type);
        case Axis.PARENT:
            return new ParentIterator().setNodeType(type);
        case Axis.ANCESTOR:
            return new TypedAncestorIterator(type);
        case Axis.ANCESTORORSELF:
            return (new TypedAncestorIterator(type)).includeSelf();
        case Axis.ATTRIBUTE:
            return new TypedAttributeIterator(type);
        case Axis.DESCENDANT:
            return new TypedDescendantIterator(type);
        case Axis.DESCENDANTORSELF:
            return (new TypedDescendantIterator(type)).includeSelf();
        case Axis.FOLLOWING:
            return new TypedFollowingIterator(type);
        case Axis.PRECEDING:
            return new TypedPrecedingIterator(type);
        case Axis.FOLLOWINGSIBLING:
            return new TypedFollowingSiblingIterator(type);
        case Axis.PRECEDINGSIBLING:
            return new TypedPrecedingSiblingIterator(type);
        case Axis.NAMESPACE:
            return  new TypedNamespaceIterator(type);
        case Axis.ROOT:
            return new TypedRootIterator(type);
        default:
            BasisLibrary.runTimeError(BasisLibrary.TYPED_AXIS_SUPPORT_ERR,
                    Axis.getNames(axis));
    }
    return null;
}
 

/**
 * Tell if the nodeset can be walked in doc order, via static analysis.
 *
 *
 * @return true if the nodeset can be walked in doc order, without sorting.
 */
boolean canBeWalkedInNaturalDocOrderStatic()
{

  if (null != m_firstWalker)
  {
    AxesWalker walker = m_firstWalker;
    int prevAxis = -1;
    boolean prevIsSimpleDownAxis = true;

    for(int i = 0; null != walker; i++)
    {
      int axis = walker.getAxis();

      if(walker.isDocOrdered())
      {
        boolean isSimpleDownAxis = ((axis == Axis.CHILD)
                                 || (axis == Axis.SELF)
                                 || (axis == Axis.ROOT));
        // Catching the filtered list here is only OK because
        // FilterExprWalker#isDocOrdered() did the right thing.
        if(isSimpleDownAxis || (axis == -1))
          walker = walker.getNextWalker();
        else
        {
          boolean isLastWalker = (null == walker.getNextWalker());
          if(isLastWalker)
          {
            if(walker.isDocOrdered() && (axis == Axis.DESCENDANT ||
               axis == Axis.DESCENDANTORSELF || axis == Axis.DESCENDANTSFROMROOT
               || axis == Axis.DESCENDANTSORSELFFROMROOT) || (axis == Axis.ATTRIBUTE))
              return true;
          }
          return false;
        }
      }
      else
        return false;
    }
    return true;
  }
  return false;
}
 

/**
 * Special purpose function to see if we can optimize the pattern for
 * a DescendantIterator.
 *
 * @param compiler non-null reference to compiler object that has processed
 *                 the XPath operations into an opcode map.
 * @param stepOpCodePos The opcode position for the step.
 *
 * @return 32 bits as an integer that give information about the location
 * path as a whole.
 *
 * @throws javax.xml.transform.TransformerException
 */
public static int getAxisFromStep(
        Compiler compiler, int stepOpCodePos)
          throws javax.xml.transform.TransformerException
{

  int stepType = compiler.getOp(stepOpCodePos);

  switch (stepType)
  {
  case OpCodes.FROM_FOLLOWING :
    return Axis.FOLLOWING;
  case OpCodes.FROM_FOLLOWING_SIBLINGS :
    return Axis.FOLLOWINGSIBLING;
  case OpCodes.FROM_PRECEDING :
    return Axis.PRECEDING;
  case OpCodes.FROM_PRECEDING_SIBLINGS :
    return Axis.PRECEDINGSIBLING;
  case OpCodes.FROM_PARENT :
    return Axis.PARENT;
  case OpCodes.FROM_NAMESPACE :
    return Axis.NAMESPACE;
  case OpCodes.FROM_ANCESTORS :
    return Axis.ANCESTOR;
  case OpCodes.FROM_ANCESTORS_OR_SELF :
    return Axis.ANCESTORORSELF;
  case OpCodes.FROM_ATTRIBUTES :
    return Axis.ATTRIBUTE;
  case OpCodes.FROM_ROOT :
    return Axis.ROOT;
  case OpCodes.FROM_CHILDREN :
    return Axis.CHILD;
  case OpCodes.FROM_DESCENDANTS_OR_SELF :
    return Axis.DESCENDANTORSELF;
  case OpCodes.FROM_DESCENDANTS :
    return Axis.DESCENDANT;
  case OpCodes.FROM_SELF :
    return Axis.SELF;
  case OpCodes.OP_EXTFUNCTION :
  case OpCodes.OP_FUNCTION :
  case OpCodes.OP_GROUP :
  case OpCodes.OP_VARIABLE :
    return Axis.FILTEREDLIST;
  }

  throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NULL_ERROR_HANDLER, new Object[]{Integer.toString(stepType)})); //"Programmer's assertion: unknown opcode: "
                             //+ stepType);
 }
 

/**
 * Get a corresponding BIT_XXX from an axis.
 * @param axis One of Axis.ANCESTOR, etc.
 * @return One of BIT_ANCESTOR, etc.
 */
static public int getAnalysisBitFromAxes(int axis)
{
  switch (axis) // Generate new traverser
    {
    case Axis.ANCESTOR :
      return BIT_ANCESTOR;
    case Axis.ANCESTORORSELF :
      return BIT_ANCESTOR_OR_SELF;
    case Axis.ATTRIBUTE :
      return BIT_ATTRIBUTE;
    case Axis.CHILD :
      return BIT_CHILD;
    case Axis.DESCENDANT :
      return BIT_DESCENDANT;
    case Axis.DESCENDANTORSELF :
      return BIT_DESCENDANT_OR_SELF;
    case Axis.FOLLOWING :
      return BIT_FOLLOWING;
    case Axis.FOLLOWINGSIBLING :
      return BIT_FOLLOWING_SIBLING;
    case Axis.NAMESPACE :
    case Axis.NAMESPACEDECLS :
      return BIT_NAMESPACE;
    case Axis.PARENT :
      return BIT_PARENT;
    case Axis.PRECEDING :
      return BIT_PRECEDING;
    case Axis.PRECEDINGSIBLING :
      return BIT_PRECEDING_SIBLING;
    case Axis.SELF :
      return BIT_SELF;
    case Axis.ALLFROMNODE :
      return BIT_DESCENDANT_OR_SELF;
      // case Axis.PRECEDINGANDANCESTOR :
    case Axis.DESCENDANTSFROMROOT :
    case Axis.ALL :
    case Axis.DESCENDANTSORSELFFROMROOT :
      return BIT_ANY_DESCENDANT_FROM_ROOT;
    case Axis.ROOT :
      return BIT_ROOT;
    case Axis.FILTEREDLIST :
      return BIT_FILTER;
    default :
      return BIT_FILTER;
  }
}