| /* |
| * 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.felix.ipojo.xml.parser; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| |
| import org.xml.sax.EntityResolver; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| |
| |
| /** |
| * Entity Resolver loading embedded XML Schemas. |
| * This resolver avoid using a network connection to get schemas as they |
| * are loaded from the manipulator jar file. |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class SchemaResolver implements EntityResolver { |
| |
| /** |
| * Directory where embedded schemas are copied. |
| */ |
| public static final String XSD_PATH = "xsd"; |
| |
| /** |
| * Resolves systemIds to use embedded schemas. The schemas are loaded from |
| * the {@link SchemaResolver#XSD_PATH} directory with the current classloader. |
| * @param publicId the publicId |
| * @param systemId the systemId (Schema URL) |
| * @return the InputSource to load the schemas or <code>null</code> if the schema |
| * cannot be loaded (not embedded) |
| * @throws SAXException cannot happen |
| * @throws IOException when the embedded resource cannot be read correctly |
| * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String) |
| */ |
| public InputSource resolveEntity(String publicId, String systemId) |
| throws SAXException, IOException { |
| |
| URL url = getURL(systemId); |
| if (url == null) { |
| // Cannot found the resource |
| return null; |
| } else { |
| return new InputSource(url.openStream()); |
| } |
| |
| } |
| |
| /** |
| * Computes the local URL of the given system Id. |
| * This URL is computed by trying to load the resource from |
| * the current classloader. First, the last fragment (file name) of the system id |
| * url is extracted and the file is loaded from the {@link SchemaResolver#XSD_PATH} |
| * directory ('xsd/extracted') |
| * @param id the systemId to load |
| * @return the URL to the resources or <code>null</code> if the resource cannot be found. |
| */ |
| private URL getURL(String id) { |
| int index = id.lastIndexOf('/'); |
| String fragment = id.substring(index); |
| return this.getClass().getClassLoader().getResource(XSD_PATH + fragment); |
| } |
| |
| } |