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package com.sun.org.apache.xerces.internal.impl.dtd.models;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLContentSpec;
import com.sun.org.apache.xerces.internal.xni.QName;
/**
* Content model leaf node.
*
* @xerces.internal
*
* @version $Id: CMLeaf.java,v 1.4 2010-11-01 04:39:43 joehw Exp $
*/
public class CMLeaf
extends CMNode {
//
// Data
//
/** This is the element that this leaf represents. */
private QName fElement = new QName();
/**
* Part of the algorithm to convert a regex directly to a DFA
* numbers each leaf sequentially. If its -1, that means its an
* epsilon node. Zero and greater are non-epsilon positions.
*/
private int fPosition = -1;
//
// Constructors
//
/** Constructs a content model leaf. */
public CMLeaf(QName element, int position) {
super(XMLContentSpec.CONTENTSPECNODE_LEAF);
// Store the element index and position
fElement.setValues(element);
fPosition = position;
}
/** Constructs a content model leaf. */
public CMLeaf(QName element) {
super(XMLContentSpec.CONTENTSPECNODE_LEAF);
// Store the element index and position
fElement.setValues(element);
}
//
// Package methods
//
final QName getElement()
{
return fElement;
}
final int getPosition()
{
return fPosition;
}
final void setPosition(int newPosition)
{
fPosition = newPosition;
}
//
// CMNode methods
//
// package
public boolean isNullable()
{
// Leaf nodes are never nullable unless its an epsilon node
return (fPosition == -1);
}
public String toString()
{
StringBuffer strRet = new StringBuffer(fElement.toString());
strRet.append(" (");
strRet.append(fElement.uri);
strRet.append(',');
strRet.append(fElement.localpart);
strRet.append(')');
if (fPosition >= 0)
{
strRet.append
(
" (Pos:"
+ new Integer(fPosition).toString()
+ ")"
);
}
return strRet.toString();
}
// protected
protected void calcFirstPos(CMStateSet toSet)
{
// If we are an epsilon node, then the first pos is an empty set
if (fPosition == -1)
toSet.zeroBits();
// Otherwise, its just the one bit of our position
else
toSet.setBit(fPosition);
}
protected void calcLastPos(CMStateSet toSet)
{
// If we are an epsilon node, then the last pos is an empty set
if (fPosition == -1)
toSet.zeroBits();
// Otherwise, its just the one bit of our position
else
toSet.setBit(fPosition);
}
} // class CMLeaf