| /* |
| * 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.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.w3c.dom.Document; |
| |
| /** |
| * 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 = uri.toURL().openConnection(); |
| 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); |
| |
| if (doc.getDocumentElement().getNamespaceURI() == null) { |
| return; |
| } |
| |
| SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); |
| // root element has namespace - we can use schema validation |
| Schema schema = factory.newSchema(new StreamSource(FeatureValidationUtil.class |
| .getResourceAsStream("/org/apache/karaf/features/karaf-features-1.0.0.xsd"))); |
| |
| // 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 " + uri, e); |
| } |
| } |
| |
| } |