Java Code Examples for org.apache.xpath.compiler.Compiler#getOp()

The following examples show how to use org.apache.xpath.compiler.Compiler#getOp() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: WalkerFactory.java    From j2objc with Apache License 2.0 6 votes vote down vote up 
/**
 * This method is for building an array of possible levels
 * where the target element(s) could be found for a match.
 * @param lpi The owning location path iterator.
 * @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 non-null AxesWalker derivative.
 *
 * @throws javax.xml.transform.TransformerException
 * @xsl.usage advanced
 */
static AxesWalker loadOneWalker(
        WalkingIterator lpi, Compiler compiler, int stepOpCodePos)
          throws javax.xml.transform.TransformerException
{

  AxesWalker firstWalker = null;
  int stepType = compiler.getOp(stepOpCodePos);

  if (stepType != OpCodes.ENDOP)
  {

    // m_axesWalkers = new AxesWalker[1];
    // As we unwind from the recursion, create the iterators.
    firstWalker = createDefaultWalker(compiler, stepType, lpi, 0);

    firstWalker.init(compiler, stepOpCodePos, stepType);
  }

  return firstWalker;
}
Example 2
Source File: WalkerFactory.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
/**
 * This method is for building an array of possible levels
 * where the target element(s) could be found for a match.
 * @param lpi The owning location path iterator object.
 * @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.
 * @param stepIndex The top-level step index withing the iterator.
 *
 * @return non-null AxesWalker derivative.
 *
 * @throws javax.xml.transform.TransformerException
 * @xsl.usage advanced
 */
static AxesWalker loadWalkers(
        WalkingIterator lpi, Compiler compiler, int stepOpCodePos, int stepIndex)
          throws javax.xml.transform.TransformerException
{

  int stepType;
  AxesWalker firstWalker = null;
  AxesWalker walker, prevWalker = null;

  int analysis = analyze(compiler, stepOpCodePos, stepIndex);

  while (OpCodes.ENDOP != (stepType = compiler.getOp(stepOpCodePos)))
  {
    walker = createDefaultWalker(compiler, stepOpCodePos, lpi, analysis);

    walker.init(compiler, stepOpCodePos, stepType);
    walker.exprSetParent(lpi);

    // walker.setAnalysis(analysis);
    if (null == firstWalker)
    {
      firstWalker = walker;
    }
    else
    {
      prevWalker.setNextWalker(walker);
      walker.setPrevWalker(prevWalker);
    }

    prevWalker = walker;
    stepOpCodePos = compiler.getNextStepPos(stepOpCodePos);

    if (stepOpCodePos < 0)
      break;
  }

  return firstWalker;
}
Example 3
Source File: WalkerFactory.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
static boolean functionProximateOrContainsProximate(Compiler compiler, 
                                                    int opPos)
{
  int endFunc = opPos + compiler.getOp(opPos + 1) - 1;
  opPos = OpMap.getFirstChildPos(opPos);
  int funcID = compiler.getOp(opPos);
  //  System.out.println("funcID: "+funcID);
  //  System.out.println("opPos: "+opPos);
  //  System.out.println("endFunc: "+endFunc);
  switch(funcID)
  {
    case FunctionTable.FUNC_LAST:
    case FunctionTable.FUNC_POSITION:
      return true;
    default:
      opPos++;
      int i = 0;
      for (int p = opPos; p < endFunc; p = compiler.getNextOpPos(p), i++)
      {
        int innerExprOpPos = p+2;
        int argOp = compiler.getOp(innerExprOpPos);
        boolean prox = isProximateInnerExpr(compiler, innerExprOpPos);
        if(prox)
          return true;
      }

  }
  return false;
}
Example 4
Source File: WalkerFactory.java    From j2objc with Apache License 2.0 5 votes vote down vote up 
static boolean isProximateInnerExpr(Compiler compiler, int opPos)
{
  int op = compiler.getOp(opPos);
  int innerExprOpPos = opPos+2;
  switch(op)
  {
    case OpCodes.OP_ARGUMENT:
      if(isProximateInnerExpr(compiler, innerExprOpPos))
        return true;
      break;
    case OpCodes.OP_VARIABLE:
    case OpCodes.OP_NUMBERLIT:
    case OpCodes.OP_LITERAL:
    case OpCodes.OP_LOCATIONPATH:
      break; // OK
    case OpCodes.OP_FUNCTION:
      boolean isProx = functionProximateOrContainsProximate(compiler, opPos);
      if(isProx)
        return true;
      break;
    case OpCodes.OP_GT:
    case OpCodes.OP_GTE:
    case OpCodes.OP_LT:
    case OpCodes.OP_LTE:
    case OpCodes.OP_EQUALS:
      int leftPos = OpMap.getFirstChildPos(op);
      int rightPos = compiler.getNextOpPos(leftPos);
      isProx = isProximateInnerExpr(compiler, leftPos);
      if(isProx)
        return true;
      isProx = isProximateInnerExpr(compiler, rightPos);
      if(isProx)
        return true;
      break;
    default:
      return true; // be conservative...
  }
  return false;
}
Example 5
Source File: UnionPathIterator.java    From j2objc with Apache License 2.0 4 votes vote down vote up 
/**
 * Initialize the location path iterators.  Recursive.
 *
 * @param compiler The Compiler which is creating 
 * this expression.
 * @param opPos The position of this iterator in the 
 * opcode list from the compiler.
 * @param count The insert position of the iterator.
 *
 * @throws javax.xml.transform.TransformerException
 */
protected void loadLocationPaths(Compiler compiler, int opPos, int count)
        throws javax.xml.transform.TransformerException
{

  // TODO: Handle unwrapped FilterExpr
  int steptype = compiler.getOp(opPos);

  if (steptype == OpCodes.OP_LOCATIONPATH)
  {
    loadLocationPaths(compiler, compiler.getNextOpPos(opPos), count + 1);

    m_exprs[count] = createDTMIterator(compiler, opPos);
    m_exprs[count].exprSetParent(this);
  }
  else
  {

    // Have to check for unwrapped functions, which the LocPathIterator
    // doesn't handle. 
    switch (steptype)
    {
    case OpCodes.OP_VARIABLE :
    case OpCodes.OP_EXTFUNCTION :
    case OpCodes.OP_FUNCTION :
    case OpCodes.OP_GROUP :
      loadLocationPaths(compiler, compiler.getNextOpPos(opPos), count + 1);

      WalkingIterator iter =
        new WalkingIterator(compiler.getNamespaceContext());
      iter.exprSetParent(this);
        
      if(compiler.getLocationPathDepth() <= 0)
        iter.setIsTopLevel(true);

      iter.m_firstWalker = new org.apache.xpath.axes.FilterExprWalker(iter);

      iter.m_firstWalker.init(compiler, opPos, steptype);

      m_exprs[count] = iter;
      break;
    default :
      m_exprs = new LocPathIterator[count];
    }
  }
}
Example 6
Source File: WalkerFactory.java    From j2objc with Apache License 2.0 4 votes vote down vote up 
/**
 * 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);
 }