/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.apache.org.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.xerces.validators.common;

import org.apache.xerces.framework.XMLContentSpec;
import org.apache.xerces.utils.ImplementationMessages;
import org.apache.xerces.utils.QName;
import org.apache.xerces.utils.StringPool;

/**
 * Content model any node.
 *
 * @version $Id$
 */
public class CMAny
    extends CMNode {

    //
    // Data
    //

    /** 
     * The any content model type. This value is one of the following:
     * XMLContentSpec.CONTENTSPECNODE_ANY, 
     * XMLContentSpec.CONTENTSPECNODE_ANY_OTHER,
     * XMLContentSpec.CONTENTSPECNODE_ANY_LOCAL.
     */
    private int fType;

    /**
     * URI of the any content model. This value is set if the type is
     * of the following:
     * XMLContentSpec.CONTENTSPECNODE_ANY, 
     * XMLContentSpec.CONTENTSPECNODE_ANY_OTHER.
     */
    private int fURI;

    /**
     * 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 any. */
    public CMAny(int type, int uri, int position) throws CMException {
        super(type);

        // Store the information
        fType = type;
        fURI = uri;
        fPosition = position;
    }

    //
    // Package methods
    //

    final int getType() {
        return fType;
    }

    final int getURI() {
        return fURI;
    }

    final int getPosition()
    {
        return fPosition;
    }

    final void setPosition(int newPosition)
    {
        fPosition = newPosition;
    }

    //
    // CMNode methods
    //

    // package

    boolean isNullable() throws CMException
    {
        // Leaf nodes are never nullable unless its an epsilon node
        return (fPosition == -1);
    }

    String toString(StringPool stringPool)
    {
        StringBuffer strRet = new StringBuffer();
        strRet.append("(");
        strRet.append("##any:uri=");
        strRet.append(stringPool.toString(fURI));
        strRet.append(')');
        if (fPosition >= 0)
        {
            strRet.append
            (
                " (Pos:"
                + new Integer(fPosition).toString()
                + ")"
            );
        }
        return strRet.toString();
    }

    // protected

    protected void calcFirstPos(CMStateSet toSet) throws CMException
    {
        // 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) throws CMException
    {
        // 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 CMAny