| /* |
| * 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.commons.jci.stores; |
| |
| import org.apache.commons.jci.utils.ConversionUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| |
| /** |
| * A ClassLoader backed by an array of ResourceStores |
| * |
| * @author tcurdt |
| */ |
| public final class ResourceStoreClassLoader extends ClassLoader { |
| |
| private final Log log = LogFactory.getLog(ResourceStoreClassLoader.class); |
| |
| private final ResourceStore[] stores; |
| |
| public ResourceStoreClassLoader( final ClassLoader pParent, final ResourceStore[] pStores ) { |
| super(pParent); |
| |
| stores = new ResourceStore[pStores.length]; |
| System.arraycopy(pStores, 0, stores, 0, stores.length); |
| } |
| |
| private Class fastFindClass(final String name) { |
| |
| if (stores != null) { |
| for (ResourceStore store : stores) { |
| final byte[] clazzBytes = store.read(ConversionUtils.convertClassToResourcePath(name)); |
| if (clazzBytes != null) { |
| log.debug(getId() + " found class: " + name + " (" + clazzBytes.length + " bytes)"); |
| return defineClass(name, clazzBytes, 0, clazzBytes.length); |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException { |
| // log.debug(getId() + " looking for: " + name); |
| Class clazz = findLoadedClass(name); |
| |
| if (clazz == null) { |
| clazz = fastFindClass(name); |
| |
| if (clazz == null) { |
| |
| final ClassLoader parent = getParent(); |
| if (parent != null) { |
| clazz = parent.loadClass(name); |
| // log.debug(getId() + " delegating loading to parent: " + name); |
| } else { |
| throw new ClassNotFoundException(name); |
| } |
| |
| } else { |
| log.debug(getId() + " loaded from store: " + name); |
| } |
| } |
| |
| if (resolve) { |
| resolveClass(clazz); |
| } |
| |
| return clazz; |
| } |
| |
| protected Class findClass( final String name ) throws ClassNotFoundException { |
| final Class clazz = fastFindClass(name); |
| if (clazz == null) { |
| throw new ClassNotFoundException(name); |
| } |
| return clazz; |
| } |
| |
| private String getId() { |
| return "" + this + "[" + this.getClass().getClassLoader() + "]"; |
| } |
| } |