/* Generated By:JJTree: Do not edit this line. Some.java */

package org.apache.xpath.quantified;

import javax.xml.transform.TransformerException;

import org.apache.xpath.Expression;
import org.apache.xpath.ExpressionOwner;
import org.apache.xpath.VariableComposeState;
import org.apache.xpath.VariableStack;
import org.apache.xpath.XPathContext;
import org.apache.xpath.XPathVisitor;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.operations.Variable;
import org.apache.xpath.parser.Node;
import org.apache.xpath.parser.QuantifiedExpr;
import org.apache.xml.utils.QName;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XSequence;
import org.apache.xpath.objects.XNodeSequenceSingleton;

public class Some extends Expression implements ExpressionOwner
{
	
  Expression m_test;

  Expression[] m_clauses;

  Expression[] m_vars;
  
  int m_evalPos = 0;
  
  XSequence[] m_evaluations;
	
  public Some() {
    super();
  }

  /** Accept the visitor. **/
  public Object jjtAccept(org.apache.xpath.parser.XPathVisitor visitor, Object data) {
    return visitor.visit(this, data);
  }  
  
  
  /**
   * @see org.apache.xpath.parser.Node#jjtSetParent(Node)
   */
  public void jjtSetParent(Node n)
  {
    super.jjtSetParent(n);
    if (n instanceof QuantifiedExpr) // don't fix up if we're reducing
    {
      QuantifiedExpr qexpr = (QuantifiedExpr) n;

      // At this point all children should have been added except this node.
      // This has a fixed number of children.
      int i = qexpr.jjtGetNumChildren();
      m_test = (Expression) qexpr.jjtGetChild(--i);
      m_test.jjtSetParent(this);
      i-=2;
      int count = (i)/3;
      m_clauses = new Expression[count];
      m_vars = new Expression[count];
      m_evaluations = new XSequence[count];
      count = 0;
      while(i>0)
      {      
      m_clauses[count] = (Expression) qexpr.jjtGetChild(i);
      m_clauses[count].jjtSetParent(this);
      m_vars [count]= (Expression) qexpr.jjtGetChild(i-=2);
      m_vars[count++].jjtSetParent(this);
      i--;
      }

      qexpr.m_exprs.setSize(1);
    }
  }
  
  /**
   * @see org.apache.xpath.parser.Node#jjtGetChild(int)
   */
  public Node jjtGetChild(int i)
  {
  	if (i == this.jjtGetNumChildren() -1)
  	return m_test;
  	else if (i < m_vars.length)
    return m_vars[i];
   else if (i < m_vars.length + m_clauses.length) 
    return m_clauses[i - m_vars.length];
   else  
    return null;
  }
  
  /**
   * @see Expression#deepEquals(Expression)
   */
  public boolean deepEquals(Expression expr)
  {
    return false;
  }
  /**
   * @see Expression#fixupVariables(Vector, int)
   */
  public void fixupVariables(VariableComposeState vcs)
  {
  	vcs.pushStackMark();
    int globalsSize = vcs.getGlobalsSize();
    for (int i = 0; i < m_vars.length; i++)
    {
      Variable var = (Variable)m_vars[i];
      QName varName = var.getQName();
      int index = vcs.addVariableName(varName) - globalsSize;
      var.setIndex(index);
      var.setFixUpWasCalled(true);
      // var.fixupVariables(vcs);
    }
    m_test.fixupVariables(vcs);
    vcs.popStackMark();
  }

  /**
   * Bind the next tuple of values to the variables
   * 
   * @return XObject The last evaluation found, or null if 
   * there's no more to evaluate.
   */
  public XObject evalVars(XPathContext xctxt) throws TransformerException
  {
    //XObject var = m_var.execute(xctxt);
    VariableStack vars = xctxt.getVarStack();
    XSequence xseq;
    XObject xobj = null; 
  	for (int i =m_evalPos; i < m_vars.length; i++)
  	{
  	  if (m_evaluations[i] == null)
  	  {
  	    XObject clauseResult = m_clauses[i].execute(xctxt);
  	    xseq = clauseResult.xseq();
  	    m_evaluations[i] = xseq;  	  
  	  }
  	  else
  	  xseq = m_evaluations[i];
  	  
  	  xobj = xseq.next();
  	  if (null != xobj) 
  	  { 	
  	    vars.setLocalVariable(((Variable)m_vars[i]).getIndex(), xobj);  	    
  	    m_evalPos = i;
  	  }
  	  else
  	  {
  	    if (i != 0)
  	    {
  	      m_evaluations[i] = null;
  	      i -=2;  	      
  	    }
  	    else
  	    {
  	      m_evalPos = m_vars.length;
  	      break;
  	    }
  	  }
  	}
  	return xobj;
  }


  /**
   * @see Expression#execute(XPathContext)
   */
  public XObject execute(XPathContext xctxt) throws TransformerException
  {
    boolean testResult = true;
    while (true)
    {
      XObject xobj; 
  	  xobj = evalVars(xctxt);
  	  if (null != xobj)
  	  {
  	     testResult = m_test.execute(xctxt).bool();
  	    if(testResult)
         return new XBoolean(true);
  	  }
  	  else 
  	  break;  	  
    }
    return new XBoolean(false);
  //	
  //	XSequence xseq = clauseResult.xseq();
  	
 // 	VariableStack vars = xctxt.getVarStack();
 //   int thisframe = vars.getStackFrame();

//  	XObject item;
 // 	try{
 /* 	int[] currentExpressionNodes = xctxt.getCurrentExpressionNodeStack();
      int currentExpressionNodePos =
        xctxt.getCurrentExpressionNodesFirstFree() - 1;
    int argsFrame = -1;    
    argsFrame = vars.link(1);
    vars.setStackFrame(thisframe);
      while (null != (item = xseq.next()))
      {
        xctxt.setCurrentItem(item);
        if(item instanceof XNodeSequenceSingleton)
        {
          XNodeSequenceSingleton xnss = (XNodeSequenceSingleton)item;
          int nodeHandle = xnss.getNodeHandle();
          currentExpressionNodes[currentExpressionNodePos] = nodeHandle;
        }
             
        // This code will create a section on the stack that is all the 
        // evaluated arguments.  These will be copied into the real params 
        // section of each called template.
        
        vars.setLocalVariable(0, item, argsFrame);
        vars.setStackFrame(argsFrame); 
        
        boolean testResult = m_test.execute(xctxt).bool();
        if(testResult)
        return new XBoolean(true);
      //}
    return new XBoolean(false);*/
  	
  }

  /**
   * @see XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)
   */
  public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
  {
  }

  /**
   * @see ExpressionOwner#getExpression()
   */
  public Expression getExpression()
  {
    return null;
  }

  /**
   * @see ExpressionOwner#setExpression(Expression)
   */
  public void setExpression(Expression exp)
  {
  }

}