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package com.sun.org.apache.xerces.internal.impl.dtd.models;
import com.sun.org.apache.xerces.internal.impl.dtd.XMLContentSpec;
/**
* Content model Bin-Op node.
*
* @xerces.internal
*
* @version $Id: CMBinOp.java,v 1.4 2010-11-01 04:39:43 joehw Exp $
*/
public class CMBinOp extends CMNode
{
// -------------------------------------------------------------------
// Constructors
// -------------------------------------------------------------------
public CMBinOp(int type, CMNode leftNode, CMNode rightNode)
{
super(type);
// Insure that its one of the types we require
if ((type() != XMLContentSpec.CONTENTSPECNODE_CHOICE)
&& (type() != XMLContentSpec.CONTENTSPECNODE_SEQ))
{
throw new RuntimeException("ImplementationMessages.VAL_BST");
}
// Store the nodes and init any data that needs it
fLeftChild = leftNode;
fRightChild = rightNode;
}
// -------------------------------------------------------------------
// Package, final methods
// -------------------------------------------------------------------
final CMNode getLeft()
{
return fLeftChild;
}
final CMNode getRight()
{
return fRightChild;
}
// -------------------------------------------------------------------
// Package, inherited methods
// -------------------------------------------------------------------
public boolean isNullable()
{
//
// If its an alternation, then if either child is nullable then
// this node is nullable. If its a concatenation, then both of
// them have to be nullable.
//
if (type() == XMLContentSpec.CONTENTSPECNODE_CHOICE)
return (fLeftChild.isNullable() || fRightChild.isNullable());
else if (type() == XMLContentSpec.CONTENTSPECNODE_SEQ)
return (fLeftChild.isNullable() && fRightChild.isNullable());
else
throw new RuntimeException("ImplementationMessages.VAL_BST");
}
// -------------------------------------------------------------------
// Protected, inherited methods
// -------------------------------------------------------------------
protected void calcFirstPos(CMStateSet toSet)
{
if (type() == XMLContentSpec.CONTENTSPECNODE_CHOICE)
{
// Its the the union of the first positions of our children.
toSet.setTo(fLeftChild.firstPos());
toSet.union(fRightChild.firstPos());
}
else if (type() == XMLContentSpec.CONTENTSPECNODE_SEQ)
{
//
// If our left child is nullable, then its the union of our
// children's first positions. Else is our left child's first
// positions.
//
toSet.setTo(fLeftChild.firstPos());
if (fLeftChild.isNullable())
toSet.union(fRightChild.firstPos());
}
else
{
throw new RuntimeException("ImplementationMessages.VAL_BST");
}
}
protected void calcLastPos(CMStateSet toSet)
{
if (type() == XMLContentSpec.CONTENTSPECNODE_CHOICE)
{
// Its the the union of the first positions of our children.
toSet.setTo(fLeftChild.lastPos());
toSet.union(fRightChild.lastPos());
}
else if (type() == XMLContentSpec.CONTENTSPECNODE_SEQ)
{
//
// If our right child is nullable, then its the union of our
// children's last positions. Else is our right child's last
// positions.
//
toSet.setTo(fRightChild.lastPos());
if (fRightChild.isNullable())
toSet.union(fLeftChild.lastPos());
}
else
{
throw new RuntimeException("ImplementationMessages.VAL_BST");
}
}
// -------------------------------------------------------------------
// Private data members
//
// fLeftChild
// fRightChild
// These are the references to the two nodes that are on either
// side of this binary operation.
// -------------------------------------------------------------------
private CMNode fLeftChild;
private CMNode fRightChild;
};