/*
* 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.karaf.features.internal;
import java.io.InputStream;
import java.net.URI;
import java.net.URLConnection;
import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.apache.karaf.features.FeaturesNamespaces;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
/**
* Utility class which fires XML Schema validation.
*/
public class FeatureValidationUtil {
/**
* Runs schema validation.
*
* @param uri Uri to validate.
* @throws Exception When validation fails.
*/
public static void validate(URI uri) throws Exception {
URLConnection conn = null;
try {
conn = uri.toURL().openConnection();
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("invalid URI: " + uri, e);
}
conn.setDefaultUseCaches(false);
InputStream stream = conn.getInputStream();
// load document and check the root element for namespace declaration
DocumentBuilderFactory dFactory = DocumentBuilderFactory.newInstance();
dFactory.setNamespaceAware(true);
Document doc = dFactory.newDocumentBuilder().parse(stream);
QName name = new QName(doc.getDocumentElement().getNamespaceURI(), doc.getDocumentElement().getLocalName());
if (FeaturesNamespaces.FEATURES_0_0_0.equals(name)) {
return;
} else if (FeaturesNamespaces.FEATURES_1_0_0.equals(name)) {
validate(doc, "/org/apache/karaf/features/karaf-features-1.0.0.xsd");
} else if (FeaturesNamespaces.FEATURES_1_1_0.equals(name)) {
validate(doc, "/org/apache/karaf/features/karaf-features-1.1.0.xsd");
} else if (FeaturesNamespaces.FEATURES_1_2_0.equals(name)) {
validate(doc, "/org/apache/karaf/features/karaf-features-1.2.0.xsd");
} else if (FeaturesNamespaces.FEATURES_1_2_1.equals(name)) {
validate(doc, "/org/apache/karaf/features/karaf-features-1.2.1.xsd");
}
else {
throw new IllegalArgumentException("Unrecognized root element: " + name);
}
}
private static void validate(Document doc, String schemaLocation) throws SAXException {
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
/** FIXME should move to 1.1.0 ? */
// root element has namespace - we can use schema validation
Schema schema = factory.newSchema(new StreamSource(FeatureValidationUtil.class
.getResourceAsStream(schemaLocation)));
// create schema by reading it from an XSD file:
Validator validator = schema.newValidator();
try {
validator.validate(new DOMSource(doc));
} catch (Exception e) {
throw new IllegalArgumentException("Unable to validate " + doc.getDocumentURI(), e);
}
}
}