Package org.loboevolution.apache.xpath.axes

Class PredicatedNodeTest

java.lang.Object
org.loboevolution.apache.xpath.Expression
org.loboevolution.apache.xpath.patterns.NodeTest
org.loboevolution.apache.xpath.axes.PredicatedNodeTest
All Implemented Interfaces:
SourceLocator, SubContextList, ExpressionNode, XPathVisitable
Direct Known Subclasses:
AxesWalker, LocPathIterator
public abstract class PredicatedNodeTest extends NodeTest implements SubContextList

  • Field Details

    • m_predCount

      protected int m_predCount

    • m_foundLast

      protected transient boolean m_foundLast
      This is true if nextNode returns null.

    • m_lpi

      protected LocPathIterator m_lpi
      The owning location path iterator.

    • m_proximityPositions

      protected transient int[] m_proximityPositions
      An array of counts that correspond to the number of predicates the step contains.

  • Method Details

    • clone

      public Object clone() throws CloneNotSupportedException
      Overrides:
      clone in class Object
      Throws:
      CloneNotSupportedException

    • getPredicateCount

      public int getPredicateCount()
      Get the number of predicates that this walker has.
      Returns:
      the number of predicates that this walker has.

    • setPredicateCount

      public void setPredicateCount(int count)
      Set the number of predicates that this walker has. This does more that one would think, as it creates a new predicate array of the size of the count argument, and copies count predicates into the new one from the old, and then reassigns the predicates value. All this to keep from having to have a predicate count value.
      Parameters:
      count - The number of predicates, which must be equal or less than the existing count.

    • initPredicateInfo

      protected void initPredicateInfo(Compiler compiler, int opPos) throws TransformerException
      Init predicate info.
      Parameters:
      compiler - The Compiler object that has information about this walker in the op map.
      opPos - The op code position of this location step.
      Throws:
      TransformerException - if any

    • getPredicate

      public Expression getPredicate(int index)
      Get a predicate expression at the given index.
      Parameters:
      index - Index of the predicate.
      Returns:
      A predicate expression.

    • getProximityPosition

      public int getProximityPosition()
      Get the current sub-context position.
      Returns:
      The node position of this walker in the sub-context node list.

    • getProximityPosition

      public int getProximityPosition(XPathContext xctxt)
      Get the current sub-context position.
      Specified by:
      getProximityPosition in interface SubContextList
      Parameters:
      xctxt - The XPath runtime context.
      Returns:
      The position of the current node in the list.

    • getLastPos

      public abstract int getLastPos(XPathContext xctxt)
      Get the number of nodes in the node list, which, in the XSLT 1 based counting system, is the last index position.
      Specified by:
      getLastPos in interface SubContextList
      Parameters:
      xctxt - The XPath runtime context.
      Returns:
      the number of nodes in the node list.

    • getProximityPosition

      protected int getProximityPosition(int predicateIndex)
      Get the current sub-context position.
      Parameters:
      predicateIndex - The index of the predicate where the proximity should be taken from.
      Returns:
      The node position of this walker in the sub-context node list.

    • resetProximityPositions

      public void resetProximityPositions()
      Reset the proximity positions counts.

    • initProximityPosition

      public void initProximityPosition(int i)
      Init the proximity position to zero for a forward axes.
      Parameters:
      i - The index into the m_proximityPositions array.

    • countProximityPosition

      protected void countProximityPosition(int i)
      Count forward one proximity position.
      Parameters:
      i - The index into the m_proximityPositions array, where the increment will occur.

    • isReverseAxes

      public boolean isReverseAxes()
      Tells if this is a reverse axes.
      Returns:
      false, unless a derived class overrides.

    • nodeToString

      protected String nodeToString(int n)
      Diagnostics.
      Parameters:
      n - Node to give diagnostic information about, or null.
      Returns:
      Informative string about the argument.

    • acceptNode

      public short acceptNode(int n)
      Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator. This function will be called by the implementation of TreeWalker and NodeIterator; it is not intended to be called directly from user code.
      Parameters:
      n - The node to check to see if it passes the filter or not.
      Returns:
      a constant to determine whether the node is accepted, rejected, or skipped, as defined above .

    • setLocPathIterator

      public void setLocPathIterator(LocPathIterator li)
      Set the location path iterator owner for this walker. Besides initialization, this function is called during cloning operations.
      Parameters:
      li - non-null reference to the owning location path iterator.

    • canTraverseOutsideSubtree

      public boolean canTraverseOutsideSubtree()
      Tell if this expression or it's subexpressions can traverse outside the current subtree.
      Overrides:
      canTraverseOutsideSubtree in class Expression
      Returns:
      true if traversal outside the context node's subtree can occur.

    • callPredicateVisitors

      public void callPredicateVisitors(XPathVisitor visitor)
      This will traverse the heararchy, calling the visitor for each member. If the called visitor method returns false, the subtree should not be called.
      Parameters:
      visitor - The visitor whose appropriate method will be called.

    • deepEquals

      public boolean deepEquals(Expression expr)
      Compare this object with another object and see if they are equal, include the sub heararchy.
      Overrides:
      deepEquals in class NodeTest
      Parameters:
      expr - Another expression object.
      Returns:
      true if this objects class and the expr object's class are the same, and the data contained within both objects are considered equal.