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package com.sun.org.apache.xerces.internal.impl.xs.models;
import com.sun.org.apache.xerces.internal.xni.QName;
import com.sun.org.apache.xerces.internal.impl.xs.SubstitutionGroupHandler;
import com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaException;
import java.util.Vector;
import java.util.ArrayList;
/**
* XSEmptyCM is a derivative of the abstract content model base class that
* handles a content model with no chilren (elements).
*
* This model validated on the way in.
*
* @xerces.internal
*
* @author Elena Litani, Lisa Martin
* @author IBM
* @version $Id: XSEmptyCM.java,v 1.9 2010-11-01 04:39:58 joehw Exp $
*/
public class XSEmptyCM implements XSCMValidator {
//
// Constants
//
// start the content model: did not see any children
private static final short STATE_START = 0;
private static final Vector EMPTY = new Vector(0);
//
// Data
//
//
// XSCMValidator methods
//
/**
* This methods to be called on entering a first element whose type
* has this content model. It will return the initial state of the content model
*
* @return Start state of the content model
*/
public int[] startContentModel(){
return (new int[] {STATE_START});
}
/**
* The method corresponds to one transaction in the content model.
*
* @param elementName the qualified name of the element
* @param currentState Current state
* @param subGroupHandler the substitution group handler
* @return element index corresponding to the element from the Schema grammar
*/
public Object oneTransition (QName elementName, int[] currentState, SubstitutionGroupHandler subGroupHandler){
// error state
if (currentState[0] < 0) {
currentState[0] = XSCMValidator.SUBSEQUENT_ERROR;
return null;
}
currentState[0] = XSCMValidator.FIRST_ERROR;
return null;
}
/**
* The method indicates the end of list of children
*
* @param currentState Current state of the content model
* @return true if the last state was a valid final state
*/
public boolean endContentModel (int[] currentState){
boolean isFinal = false;
int state = currentState[0];
// restore content model state:
// error
if (state < 0) {
return false;
}
return true;
}
/**
* check whether this content violates UPA constraint.
*
* @param subGroupHandler the substitution group handler
* @return true if this content model contains other or list wildcard
*/
public boolean checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler) throws XMLSchemaException {
return false;
}
/**
* Check which elements are valid to appear at this point. This method also
* works if the state is in error, in which case it returns what should
* have been seen.
*
* @param state the current state
* @return a Vector whose entries are instances of
* either XSWildcardDecl or XSElementDecl.
*/
public Vector whatCanGoHere(int[] state) {
return EMPTY;
}
public ArrayList checkMinMaxBounds() {
return null;
}
} // class XSEmptyCM