- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999-2002 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 com.sun.org.apache.xerces.internal.impl.dtd.models;
-
- /**
- * A content model node.
- *
- * @version $Id: CMNode.java,v 1.2 2002/01/29 01:15:10 lehors Exp $
- */
- public abstract class CMNode
- {
- // -------------------------------------------------------------------
- // Constructors
- // -------------------------------------------------------------------
- public CMNode(int type)
- {
- fType = type;
- }
-
-
- // -------------------------------------------------------------------
- // Package, abstract methods
- // -------------------------------------------------------------------
- // made this public so it could be implemented and used outside this package -neilg.
- public abstract boolean isNullable() ;
-
-
- // -------------------------------------------------------------------
- // Package final methods
- // -------------------------------------------------------------------
- public final int type()
- {
- return fType;
- }
-
- // made this public so it could be implemented and used outside this package -neilg.
- public final CMStateSet firstPos()
- {
- if (fFirstPos == null)
- {
- fFirstPos = new CMStateSet(fMaxStates);
- calcFirstPos(fFirstPos);
- }
- return fFirstPos;
- }
-
- // made this public so it could be implemented and used outside this package -neilg.
- public final CMStateSet lastPos()
- {
- if (fLastPos == null)
- {
- fLastPos = new CMStateSet(fMaxStates);
- calcLastPos(fLastPos);
- }
- return fLastPos;
- }
-
- final void setFollowPos(CMStateSet setToAdopt)
- {
- fFollowPos = setToAdopt;
- }
-
- public final void setMaxStates(int maxStates)
- {
- fMaxStates = maxStates;
- }
-
-
- // -------------------------------------------------------------------
- // Protected, abstract methods
- // -------------------------------------------------------------------
- protected abstract void calcFirstPos(CMStateSet toSet) ;
-
- protected abstract void calcLastPos(CMStateSet toSet) ;
-
-
- // -------------------------------------------------------------------
- // Private data members
- //
- // fType
- // The type of node. This indicates whether its a leaf or an
- // operation. Though we also do derived classes for these types,
- // it is too expensive to use runtime typing to find this out.
- // This is one of the ContentSpecNode.NODE_XXX types.
- //
- // fFirstPos
- // The set of NFA states that represent the entry states of this
- // node in the DFA.
- //
- // fFollowPos
- // The set of NFA states that can be gotten to from from this
- // node in the DFA.
- //
- // fLastPos
- // The set of NFA states that represent the final states of this
- // node in the DFA.
- //
- // fMaxStates
- // The maximum number of states that the NFA has, which means the
- // max number of NFA states that have to be traced in the state
- // sets during the building of the DFA. Its unfortunate that it
- // has to be stored redundantly, but we need to fault in the
- // state set members and they have to be sized to this size. We
- // init to to -1 so it will cause an error if its used without
- // being initialized.
- // -------------------------------------------------------------------
- private int fType;
- private CMStateSet fFirstPos = null;
- private CMStateSet fFollowPos = null;
- private CMStateSet fLastPos = null;
- private int fMaxStates = -1;
- };
-
-