src/com/sun/org/apache/xerces/internal/impl/dtd/models/CMUniOp.java

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 * The Apache Software License, Version 1.1
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 * reserved.
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 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 * This software consists of voluntary contributions made by many
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 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
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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
 *
 */
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;
};