/*
* Copyright 1999-2002,2004 The Apache Software Foundation.
*
* Licensed 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 org.apache.xerces.impl.dtd.models;
/**
* A content model node.
*
* @xerces.internal
*
* @version $Id: CMNode.java 320090 2004-10-04 22:00:42Z mrglavas $
*/
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;
};