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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package org.apache.myfaces.tobago.internal.config;
21  
22  import org.apache.myfaces.tobago.internal.util.IoUtils;
23  import org.xml.sax.Attributes;
24  import org.xml.sax.SAXException;
25  
26  import javax.xml.parsers.ParserConfigurationException;
27  import javax.xml.parsers.SAXParser;
28  import javax.xml.parsers.SAXParserFactory;
29  import java.io.IOException;
30  import java.io.InputStream;
31  import java.net.URL;
32  
33  public class TobagoConfigVersion extends TobagoConfigEntityResolver {
34  
35    /** Schema or DTD? */
36    private boolean schema;
37  
38    private String version;
39  
40    public TobagoConfigVersion(final URL url) throws ParserConfigurationException, SAXException, IOException {
41  
42      // simple reading with no validation, at this time
43      InputStream inputStream = null;
44      try {
45        inputStream = url.openStream();
46        final SAXParserFactory factory = SAXParserFactory.newInstance();
47        final SAXParser saxParser = factory.newSAXParser();
48        saxParser.parse(inputStream, this);
49      } finally {
50        IoUtils.closeQuietly(inputStream);
51      }
52    }
53  
54    @Override
55    public void startElement(final String uri, final String localName, final String qName, final Attributes attributes) {
56      if ("tobago-config".equals(qName)) {
57        version = attributes.getValue("version");
58        schema = version != null;
59      }
60    }
61  
62    public boolean isSchema() {
63      return schema;
64    }
65  
66    public String getVersion() {
67      return version;
68    }
69  }