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/*
* 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;
}
}
}
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