content: /*
   * 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 mf.org.apache.xerces.impl.xs.models;
  
  import java.util.Vector;
  
  import mf.org.apache.xerces.impl.xs.SubstitutionGroupHandler;
  import mf.org.apache.xerces.impl.xs.XMLSchemaException;
  import mf.org.apache.xerces.xni.QName;
  
  
  /**
   * XSEmptyCM is a derivative of the abstract content model base class that
   * handles a content model with no children (elements).
   * <p/>
   * This model validated on the way in.
   *
   * @author Elena Litani, IBM
   * @author Lisa Martin, IBM
   * @version $Id: XSEmptyCM.java 806363 2009-08-20 21:18:48Z mrglavas $
   * @xerces.internal
   */
  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
       */
      @Override
      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
       */
      @Override
      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
       */
      @Override
      public boolean endContentModel(int[] currentState) {
          boolean isFinal = false;
          int state = currentState[0];
  
          // restore content model state:
  
          // error
          return state >= 0;
  
  
      }
  
      /**
       * check whether this content violates UPA constraint.
       *
       * @param subGroupHandler the substitution group handler
       * @return true if this content model contains other or list wildcard
       */
      @Override
      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.
       */
      @Override
      public Vector whatCanGoHere(int[] state) {
          return EMPTY;
      }
  
      @Override
      public int[] occurenceInfo(int[] state) {
          return null;
      }
  
      @Override
      public String getTermName(int termId) {
          return null;
      }
  
      @Override
      public boolean isCompactedForUPA() {
          return false;
      }
  } // class XSEmptyCM
  