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

package org.apache.xpath.seqctor;

import java.util.Vector;

import javax.xml.transform.TransformerException;
import org.apache.xpath.Expression;
import org.apache.xpath.ExpressionOwner;
import org.apache.xpath.VariableComposeState;
import org.apache.xpath.XPathContext;
import org.apache.xpath.XPathVisitor;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.parser.Node;
import org.apache.xpath.parser.Token;

public class ExprSequence extends Expression implements ExpressionOwner
{
	
  Vector m_exprs = new Vector();
	
  public void jjtAddChild(Node n, int i) 
  {
  	n = fixupPrimarys(n);
    if(null == m_exprs)
    	m_exprs  = new Vector();
  	if(i >= m_exprs.size())
  	{
  		m_exprs.setSize(i+1);
  	}
    m_exprs.setElementAt(n, i);
  }
  
  public Node jjtGetChild(int i) 
  {
    if(null == m_exprs)
    	return null;
    else
    	return (Node)m_exprs.elementAt(i);
  }

  public int jjtGetNumChildren() 
  {
    if(null == m_exprs)
    	return 0;
    else
    	return m_exprs.size();
  }
  

  /**
   * @see Expression#deepEquals(Expression)
   * Dummy stub.
   */
  public boolean deepEquals(Expression expr)
  {
    return false;
  }


  /**
   * @see Expression#fixupVariables(Vector, int)
   * Dummy stub.
   */
  public void fixupVariables(VariableComposeState vcs)
  {
    Vector exprs = m_exprs;
    int vsize = exprs.size();
    for (int i = 0; i < vsize; i++)
    {
      Expression val = (Expression)exprs.elementAt(i);
      val.fixupVariables(vcs);
    }
  }


  /**
   * @see Expression#execute(XPathContext)
   * Dummy stub.
   */
  public XObject execute(XPathContext xctxt) throws TransformerException
  {
    return new ExprSequenceIter(m_exprs, xctxt);
  }


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


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

  /**
   * @see ExpressionOwner#setExpression(Expression)
   */
  public void setExpression(Expression exp)
  {
  }
  
  /**
   * @see SimpleNode#shouldReduceIfOneChild()
   */
  public boolean shouldReduceIfOneChild()
  {
    return (jjtGetNumChildren() == 1) ? true : false;
  }
  /**
   * @see org.apache.xpath.parser.SimpleNode#isPathExprReduced()
   */
  public boolean isPathExprReduced()
  {
    return (null == m_exprs) ? false : true;
  }

}