private static int analyze()

in src/org/apache/xpath/axes/WalkerFactory.java [664:773]
91 lines of code
28 McCabe index (conditional complexity)

  private static int analyze(
          Compiler compiler, int stepOpCodePos, int stepIndex)
            throws javax.xml.transform.TransformerException
  {

    int stepType;
    int stepCount = 0;
    int analysisResult = 0x00000000;  // 32 bits of analysis

    while (OpCodes.ENDOP != (stepType = compiler.getOp(stepOpCodePos)))
    {
      stepCount++;

      // String namespace = compiler.getStepNS(stepOpCodePos);
      // boolean isNSWild = (null != namespace) 
      //                   ? namespace.equals(NodeTest.WILD) : false;
      // String localname = compiler.getStepLocalName(stepOpCodePos);
      // boolean isWild = (null != localname) ? localname.equals(NodeTest.WILD) : false;
      boolean predAnalysis = analyzePredicate(compiler, stepOpCodePos,
                                              stepType);

      if (predAnalysis)
        analysisResult |= BIT_PREDICATE;

      switch (stepType)
      {
      case OpCodes.OP_VARIABLE :
      case OpCodes.OP_EXTFUNCTION :
      case OpCodes.OP_FUNCTION :
      case OpCodes.OP_GROUP :
        analysisResult |= BIT_FILTER;
        break;
      case OpCodes.FROM_ROOT :
        analysisResult |= BIT_ROOT;
        break;
      case OpCodes.FROM_ANCESTORS :
        analysisResult |= BIT_ANCESTOR;
        break;
      case OpCodes.FROM_ANCESTORS_OR_SELF :
        analysisResult |= BIT_ANCESTOR_OR_SELF;
        break;
      case OpCodes.FROM_ATTRIBUTES :
        analysisResult |= BIT_ATTRIBUTE;
        break;
      case OpCodes.FROM_NAMESPACE :
        analysisResult |= BIT_NAMESPACE;
        break;
      case OpCodes.FROM_CHILDREN :
        analysisResult |= BIT_CHILD;
        break;
      case OpCodes.FROM_DESCENDANTS :
        analysisResult |= BIT_DESCENDANT;
        break;
      case OpCodes.FROM_DESCENDANTS_OR_SELF :

        // Use a special bit to to make sure we get the right analysis of "//foo".
        if (2 == stepCount && BIT_ROOT == analysisResult)
        {
          analysisResult |= BIT_ANY_DESCENDANT_FROM_ROOT;
        }

        analysisResult |= BIT_DESCENDANT_OR_SELF;
        break;
      case OpCodes.FROM_FOLLOWING :
        analysisResult |= BIT_FOLLOWING;
        break;
      case OpCodes.FROM_FOLLOWING_SIBLINGS :
        analysisResult |= BIT_FOLLOWING_SIBLING;
        break;
      case OpCodes.FROM_PRECEDING :
        analysisResult |= BIT_PRECEDING;
        break;
      case OpCodes.FROM_PRECEDING_SIBLINGS :
        analysisResult |= BIT_PRECEDING_SIBLING;
        break;
      case OpCodes.FROM_PARENT :
        analysisResult |= BIT_PARENT;
        break;
      case OpCodes.FROM_SELF :
        analysisResult |= BIT_SELF;
        break;
      case OpCodes.MATCH_ATTRIBUTE :
        analysisResult |= (BIT_MATCH_PATTERN | BIT_ATTRIBUTE);
        break;
      case OpCodes.MATCH_ANY_ANCESTOR :
        analysisResult |= (BIT_MATCH_PATTERN | BIT_ANCESTOR);
        break;
      case OpCodes.MATCH_IMMEDIATE_ANCESTOR :
        analysisResult |= (BIT_MATCH_PATTERN | BIT_PARENT);
        break;
      default :
        throw new RuntimeException(XSLMessages.createXPATHMessage(XPATHErrorResources.ER_NULL_ERROR_HANDLER, new Object[]{Integer.toString(stepType)})); //"Programmer's assertion: unknown opcode: "
                                   //+ stepType);
      }

      if (OpCodes.NODETYPE_NODE == compiler.getOp(stepOpCodePos + 3))  // child::node()
      {
        analysisResult |= BIT_NODETEST_ANY;
      }

      stepOpCodePos = compiler.getNextStepPos(stepOpCodePos);

      if (stepOpCodePos < 0)
        break;
    }

    analysisResult |= (stepCount & BITS_COUNT);

    return analysisResult;
  }