/*
    * 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 org.apache.myfaces.tobago.internal.config;
  
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  import java.io.IOException;
  import java.io.InputStream;
  import java.net.URL;
  
  public class TobagoConfigVersion extends TobagoConfigEntityResolver {
  
    /** Schema or DTD? */
    private boolean schema;
  
    private String version;
  
    public TobagoConfigVersion(final URL url) throws ParserConfigurationException, SAXException, IOException {
  
      // simple reading with no validation, at this time
      try (final InputStream inputStream = url.openStream()) {
        final SAXParserFactory factory = SAXParserFactory.newInstance();
        final SAXParser saxParser = factory.newSAXParser();
        saxParser.parse(inputStream, this);
      }
    }
  
    @Override
    public void startElement(final String uri, final String localName, final String qName, final Attributes attributes) {
      if ("tobago-config".equals(qName)) {
        version = attributes.getValue("version");
        schema = version != null;
      }
    }
  
    public boolean isSchema() {
      return schema;
    }
  
    public String getVersion() {
      return version;
    }
  }