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	/*
	* Copyright (c) 2006, 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.xs.models;

	import com.sun.org.apache.xerces.internal.impl.xs.SubstitutionGroupHandler;
	import com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaException;
	import com.sun.org.apache.xerces.internal.xni.QName;
	import java.util.ArrayList;
	import java.util.List;

	/**
	* 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
	* @LastModified: Oct 2017
	*/
	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 List<Object> EMPTY = new ArrayList<>(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 list whose entries are instances of
	* either XSWildcardDecl or XSElementDecl.
	*/
	public List<Object> whatCanGoHere(int[] state) {
	return EMPTY;
	}

	public List<String> checkMinMaxBounds() {
	return null;
	}

	public int [] occurenceInfo(int[] state) {
	return null;
	}

	public String getTermName(int termId) {
	return null;
	}

	public boolean isCompactedForUPA() {
	return false;
	}
	} // class XSEmptyCM

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