| /** |
| * 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.camel.core.osgi; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.URL; |
| |
| import org.apache.camel.impl.DefaultClassResolver; |
| import org.apache.camel.util.CastUtils; |
| import org.apache.camel.util.ObjectHelper; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /* Using the bundle of CamelContext to load the class */ |
| public class OsgiClassResolver extends DefaultClassResolver { |
| private static final transient Logger LOG = LoggerFactory.getLogger(OsgiClassResolver.class); |
| |
| public BundleContext bundleContext; |
| |
| public OsgiClassResolver(BundleContext context) { |
| this.bundleContext = context; |
| } |
| |
| public Class<?> resolveClass(String name) { |
| name = ObjectHelper.normalizeClassName(name); |
| Class<?> clazz = ObjectHelper.loadSimpleType(name); |
| if (clazz == null) { |
| clazz = doLoadClass(name, bundleContext.getBundle()); |
| } |
| return clazz; |
| } |
| |
| public <T> Class<T> resolveClass(String name, Class<T> type) { |
| return CastUtils.cast(resolveClass(name)); |
| } |
| |
| public InputStream loadResourceAsStream(String uri) { |
| ObjectHelper.notEmpty(uri, "uri"); |
| URL url = loadResourceAsURL(uri); |
| InputStream answer = null; |
| if (url != null) { |
| try { |
| answer = url.openStream(); |
| } catch (IOException ex) { |
| throw new RuntimeException("Cannot load resource: " + uri, ex); |
| } |
| } |
| return answer; |
| } |
| |
| public URL loadResourceAsURL(String uri) { |
| ObjectHelper.notEmpty(uri, "uri"); |
| return bundleContext.getBundle().getEntry(uri); |
| } |
| |
| protected Class<?> doLoadClass(String name, Bundle loader) { |
| ObjectHelper.notEmpty(name, "name"); |
| Class<?> answer = null; |
| // Try to use the camel context's bundle's classloader to load the class |
| if (loader != null) { |
| try { |
| answer = loader.loadClass(name); |
| } catch (ClassNotFoundException e) { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("Cannot load class: " + name + " using classloader: " + loader + ". This exception will be ignored.", e); |
| } |
| } |
| } |
| return answer; |
| } |
| |
| } |