/*
    * Copyright (c) 2008, The JUNG Authors
    *
    * All rights reserved.
    *
    * This software is open-source under the BSD license; see either
    * "license.txt" or
    * https://github.com/jrtom/jung/blob/master/LICENSE for a description.
    */
  
  package edu.uci.ics.jung.io.graphml.parser;
  
  import javax.xml.stream.events.EndElement;
  import javax.xml.stream.events.StartElement;
  
  import edu.uci.ics.jung.graph.Hypergraph;
  import edu.uci.ics.jung.io.GraphIOException;
  import edu.uci.ics.jung.io.graphml.Metadata;
  
  /**
   * Base class for element parsers - provides some minimal functionality.
   * 
   * @author Nathan Mittler - nathan.mittler@gmail.com
   */
  public abstract class AbstractElementParser<G extends Hypergraph<V,E>,V,E> implements ElementParser {
  
      final private ParserContext<G,V,E> parserContext;
      protected AbstractElementParser(ParserContext<G,V,E> parserContext) {
          this.parserContext = parserContext;
      }
      
      public ParserContext<G,V,E> getParserContext() {
          return this.parserContext;
      }
      
      public ElementParser getParser(String localName) {
          return parserContext.getElementParserRegistry().getParser(localName);
      }
      
      public void applyKeys(Metadata metadata) {
          getParserContext().getKeyMap().applyKeys(metadata);
      }
      
      public ElementParser getUnknownParser() {
          return parserContext.getElementParserRegistry().getUnknownElementParser();
      }
      
      protected void verifyMatch(StartElement start, EndElement end)
              throws GraphIOException {
  
          String startName = start.getName().getLocalPart();
          String endName = end.getName().getLocalPart();
          if (!startName.equals(endName)) {
              throw new GraphIOException(
                      "Failed parsing document: Start/end tag mismatch! "
                              + "StartTag:" + startName + ", EndTag: "
                              + endName);
          }
      }
  }