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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 Uni-Op node.
 * 
 * @xerces.internal
 *
* @version $Id: CMUniOp.java,v 1.4 2010-11-01 04:39:43 joehw Exp $
 */
public class CMUniOp extends CMNode
{
    // -------------------------------------------------------------------
    //  Constructors
    // -------------------------------------------------------------------
    public CMUniOp(int type, CMNode childNode) 
    {
        super(type);

        // Insure that its one of the types we require
        if ((type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_ONE)
        &&  (type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_MORE)
        &&  (type() != XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE))
        {
            throw new RuntimeException("ImplementationMessages.VAL_UST");
        }

        // Store the node and init any data that needs it
        fChild = childNode;
    }


    // -------------------------------------------------------------------
    //  Package, final methods
    // -------------------------------------------------------------------
    final CMNode getChild()
    {
        return fChild;
    }


    // -------------------------------------------------------------------
    //  Package, inherited methods
    // -------------------------------------------------------------------
    public boolean isNullable() 
    {
        //
        //  For debugging purposes, make sure we got rid of all non '*'
        //  repetitions. Otherwise, '*' style nodes are always nullable.
        //
        if (type() == XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE)
	    return fChild.isNullable();
	else
	    return true;
    }


    // -------------------------------------------------------------------
    //  Protected, inherited methods
    // -------------------------------------------------------------------
    protected void calcFirstPos(CMStateSet toSet) 
    {
        // Its just based on our child node's first pos
        toSet.setTo(fChild.firstPos());
    }

    protected void calcLastPos(CMStateSet toSet) 
    {
        // Its just based on our child node's last pos
        toSet.setTo(fChild.lastPos());
    }


    // -------------------------------------------------------------------
    //  Private data members
    //
    //  fChild
    //      This is the reference to the one child that we have for this
    //      unary operation.
    // -------------------------------------------------------------------
    private CMNode  fChild;
};