1 /**
2 * Copyright (c) 2011, University of Konstanz, Distributed Systems Group
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the University of Konstanz nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27 package org.jaxrx.core;
28
29 import java.io.IOException;
30 import java.io.InputStream;
31 import javax.xml.XMLConstants;
32 import javax.xml.parsers.DocumentBuilder;
33 import javax.xml.parsers.DocumentBuilderFactory;
34 import javax.xml.parsers.ParserConfigurationException;
35 import javax.xml.transform.Source;
36 import javax.xml.transform.dom.DOMSource;
37 import javax.xml.transform.sax.SAXSource;
38 import javax.xml.validation.Schema;
39 import javax.xml.validation.SchemaFactory;
40 import javax.xml.validation.Validator;
41 import org.w3c.dom.Document;
42 import org.xml.sax.InputSource;
43 import org.xml.sax.SAXException;
44
45 /**
46 * This class validates XML documents against a specified XML schema.
47 *
48 * @author Lukas Lewandowski, University of Konstanz
49 *
50 */
51 public final class SchemaChecker {
52 /**
53 * The validation schema.
54 */
55 private final String xslSchema;
56
57 /**
58 * Constructor.
59 *
60 * @param schema
61 * schema to check
62 */
63 public SchemaChecker(final String schema) {
64 xslSchema = "/" + schema + ".xsd";
65 }
66
67 /**
68 * This method parses an XML input with a W3C DOM implementation and
69 * validates it then with the available XML schema.
70 *
71 * @param input
72 * The input stream containing the XML query.
73 * @return The parsed XML source as {@link Document}.
74 */
75 public Document check(final InputStream input) {
76 Document document;
77 try {
78 final DocumentBuilder docBuilder = DocumentBuilderFactory
79 .newInstance().newDocumentBuilder();
80 document = docBuilder.parse(input);
81
82 final InputStream is = getClass().getResourceAsStream(xslSchema);
83 final Source source = new SAXSource(new InputSource(is));
84 checkIsValid(document, source);
85 } catch (final SAXException exce) {
86 throw new JaxRxException(400, exce.getMessage());
87 } catch (final ParserConfigurationException exce) {
88 throw new JaxRxException(exce);
89 } catch (final IOException exce) {
90 throw new JaxRxException(exce);
91 }
92 return document;
93 }
94
95 /**
96 * This method checks the parsed document if it is valid to a given XML
97 * schema. If not, an exception is thrown
98 *
99 * @param document
100 * The parsed document.
101 * @param source
102 * The {@link String} representation of the XML schema file.
103 * @throws SAXException
104 * if the document is invalid
105 * @throws IOException
106 * if the input cannot be read
107 */
108 private void checkIsValid(final Document document, final Source source)
109 throws SAXException, IOException {
110
111 final SchemaFactory schemaFactory = SchemaFactory
112 .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
113 final Schema schema = schemaFactory.newSchema(source);
114 final Validator validator = schema.newValidator();
115 validator.validate(new DOMSource(document));
116 }
117 }