/*

 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

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

 *

 */

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()

    {

        StringBuilder strRet = new StringBuilder(fElement.toString());

        strRet.append(" (");

        strRet.append(fElement.uri);

        strRet.append(',');

        strRet.append(fElement.localpart);

        strRet.append(')');

        if (fPosition >= 0)

        {

            strRet.append

            (

                " (Pos:"

                + fPosition

                + ")"

            );

        }

        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