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 * 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
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 *      http://www.apache.org/licenses/LICENSE-2.0
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package com.sun.org.apache.xerces.internal.impl.dtd.models;

A content model node.
@xerces.internal
/** * A content model node. * * @xerces.internal * */
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; } public boolean isCompactedForUPA() { return fCompactedForUPA; } public void setIsCompactUPAModel(boolean value) { fCompactedForUPA = value; }
Allows the user to set arbitrary data on this content model node. This is used by the a{n,m} optimization that runs in constant space.
/** * Allows the user to set arbitrary data on this content model * node. This is used by the a{n,m} optimization that runs * in constant space. */
public void setUserData(Object userData) { fUserData = userData; }
Allows the user to get arbitrary data set on this content model node. This is used by the a{n,m} optimization that runs in constant space.
/** * Allows the user to get arbitrary data set on this content * model node. This is used by the a{n,m} optimization that runs * in constant space. */
public Object getUserData() { return fUserData; } // ------------------------------------------------------------------- // 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 final int fType; private CMStateSet fFirstPos = null; private CMStateSet fFollowPos = null; private CMStateSet fLastPos = null; private int fMaxStates = -1; private Object fUserData = null; /* * This boolean is true if the model represented by the CMNode does not represent * the true model from the schema, but has had its min/maxOccurs modified for a * more compact representation (for purposes of UPA). */ private boolean fCompactedForUPA = false; };