| /* |
| * 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.netbeans.lib.jshell.agent; |
| |
| import java.io.IOException; |
| import java.net.URL; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * |
| * @author sdedic |
| */ |
| class NbRemoteLoader extends RemoteClassLoader { |
| private final NbRemoteLoader oldDelegate; |
| private final Map<String, Long> classIds; |
| private final Map<String, Class> namedClasses; |
| private final Map<Long, Class> definedClasses; |
| |
| public NbRemoteLoader(ClassLoader parent, ClassLoader oldDelegate, URL[] additionalURLs) { |
| super(additionalURLs); |
| if (oldDelegate != null && !(oldDelegate instanceof NbRemoteLoader)) { |
| throw new IllegalArgumentException("Invalid classloader: " + oldDelegate); |
| } |
| this.oldDelegate = (NbRemoteLoader)oldDelegate; |
| if (oldDelegate == null) { |
| classIds = new HashMap<String, Long>(); |
| definedClasses = new HashMap<Long, Class>(); |
| namedClasses = new HashMap<String, Class>(); |
| } else { |
| classIds = this.oldDelegate.classIds; |
| definedClasses = this.oldDelegate.definedClasses; |
| namedClasses = this.oldDelegate.namedClasses; |
| } |
| } |
| |
| private Class registerClass(Class c) { |
| Long ret = (long)classIds.size() + 1; |
| String className = c.getName(); |
| classIds.put(className, ret); |
| definedClasses.put(ret, c); |
| namedClasses.put(className, c); |
| return c; |
| } |
| |
| Long getClassId(String className) { |
| return classIds.get(className); |
| } |
| |
| Class getClassOfId(Long id) { |
| if (id == null) { |
| return null; |
| } |
| return definedClasses.get(id); |
| } |
| |
| /** |
| * Finds the class. |
| * The order should be: |
| * - the delegate classloader |
| * |
| * @param name |
| * @return |
| * @throws ClassNotFoundException |
| */ |
| @Override |
| protected Class<?> findClass(String name) throws ClassNotFoundException { |
| Class c; |
| |
| try { |
| // contact the original classloader for the application; it should not load REPL classes. |
| c = getParent().loadClass(name); |
| return c; |
| } catch (ClassNotFoundException ex) { |
| } |
| if (oldDelegate != null) { |
| try { |
| c = oldDelegate.findClass(name); |
| return registerClass(c); |
| } catch (ClassNotFoundException ex) { |
| } |
| } |
| c = namedClasses.get(name); |
| if (c != null) { |
| return c; |
| } |
| c = super.findClass(name); |
| return registerClass(c); |
| } |
| |
| @Override |
| public Enumeration<URL> findResources(String name) throws IOException { |
| Enumeration<URL> origResources = getParent().getResources(name); |
| Enumeration<URL> deleResources = oldDelegate != null ? oldDelegate.findResources(name) : Collections.<URL>emptyEnumeration(); |
| |
| return new CompoundEnumeration<URL>(new Enumeration[] { |
| origResources, |
| deleResources, |
| super.findResources(name) |
| }); |
| } |
| |
| @Override |
| public URL findResource(String name) { |
| try { |
| Enumeration<URL> res = findResources(name); |
| return res.hasMoreElements() ? res.nextElement() : null; |
| } catch (IOException ex) { |
| return null; |
| } |
| } |
| |
| |
| private static class CompoundEnumeration<T> implements Enumeration<T> { |
| private final Enumeration<T>[] enums; |
| private final HashSet<T> enumerated = new HashSet<T>(); |
| |
| private int index; |
| private T nextItem; |
| |
| public CompoundEnumeration(Enumeration<T>[] enums) { |
| this.enums = enums; |
| } |
| |
| @Override |
| public boolean hasMoreElements() { |
| if (nextItem != null) { |
| return true; |
| } |
| while (index < enums.length) { |
| Enumeration<T> del = enums[index]; |
| if (del.hasMoreElements()) { |
| T item = del.nextElement(); |
| if (!enumerated.add(item)) { |
| continue; |
| } |
| nextItem = item; |
| break; |
| } else { |
| index++; |
| } |
| } |
| return nextItem != null; |
| } |
| |
| @Override |
| public T nextElement() { |
| if (!hasMoreElements()) { |
| throw new NoSuchElementException(); |
| } |
| return nextItem; |
| } |
| |
| } |
| } |