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/*
* Copyright 2003,2004 The Apache Software Foundation
*
* Licensed 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.snapscript.cglib.proxy;
import java.security.ProtectionDomain;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.*;
import org.snapscript.asm.ClassVisitor;
import org.snapscript.cglib.core.*;
/**
* Mixin allows
* multiple objects to be combined into a single larger object. The
* methods in the generated object simply call the original methods in the
* underlying "delegate" objects.
* @author Chris Nokleberg
* @version $Id: Mixin.java,v 1.7 2005/09/27 11:42:27 baliuka Exp $
*/
abstract public class Mixin {
private static final MixinKey KEY_FACTORY =
(MixinKey)KeyFactory.create(MixinKey.class, KeyFactory.CLASS_BY_NAME);
private static final Map ROUTE_CACHE = Collections.synchronizedMap(new HashMap());
public static final int STYLE_INTERFACES = 0;
public static final int STYLE_BEANS = 1;
public static final int STYLE_EVERYTHING = 2;
interface MixinKey {
public Object newInstance(int style, String[] classes, int[] route);
}
abstract public Mixin newInstance(Object[] delegates);
/**
* Helper method to create an interface mixin. For finer control over the
* generated instance, use a new instance of Mixin
* instead of this static method.
* TODO
*/
public static Mixin create(Object[] delegates) {
Generator gen = new Generator();
gen.setDelegates(delegates);
return gen.create();
}
/**
* Helper method to create an interface mixin. For finer control over the
* generated instance, use a new instance of Mixin
* instead of this static method.
* TODO
*/
public static Mixin create(Class[] interfaces, Object[] delegates) {
Generator gen = new Generator();
gen.setClasses(interfaces);
gen.setDelegates(delegates);
return gen.create();
}
public static Mixin createBean(Object[] beans) {
return createBean(null, beans);
}
/**
* Helper method to create a bean mixin. For finer control over the
* generated instance, use a new instance of Mixin
* instead of this static method.
* TODO
*/
public static Mixin createBean(ClassLoader loader,Object[] beans) {
Generator gen = new Generator();
gen.setStyle(STYLE_BEANS);
gen.setDelegates(beans);
gen.setClassLoader(loader);
return gen.create();
}
public static class Generator extends AbstractClassGenerator {
private static final Source SOURCE = new Source(Mixin.class.getName());
private Class[] classes;
private Object[] delegates;
private int style = STYLE_INTERFACES;
private int[] route;
public Generator() {
super(SOURCE);
}
protected ClassLoader getDefaultClassLoader() {
return classes[0].getClassLoader(); // is this right?
}
protected ProtectionDomain getProtectionDomain() {
return ReflectUtils.getProtectionDomain(classes[0]);
}
public void setStyle(int style) {
switch (style) {
case STYLE_INTERFACES:
case STYLE_BEANS:
case STYLE_EVERYTHING:
this.style = style;
break;
default:
throw new IllegalArgumentException("Unknown mixin style: " + style);
}
}
public void setClasses(Class[] classes) {
this.classes = classes;
}
public void setDelegates(Object[] delegates) {
this.delegates = delegates;
}
public Mixin create() {
if (classes == null && delegates == null) {
throw new IllegalStateException("Either classes or delegates must be set");
}
switch (style) {
case STYLE_INTERFACES:
if (classes == null) {
Route r = route(delegates);
classes = r.classes;
route = r.route;
}
break;
case STYLE_BEANS:
// fall-through
case STYLE_EVERYTHING:
if (classes == null) {
classes = ReflectUtils.getClasses(delegates);
} else {
if (delegates != null) {
Class[] temp = ReflectUtils.getClasses(delegates);
if (classes.length != temp.length) {
throw new IllegalStateException("Specified classes are incompatible with delegates");
}
for (int i = 0; i < classes.length; i++) {
if (!classes[i].isAssignableFrom(temp[i])) {
throw new IllegalStateException("Specified class " + classes[i] + " is incompatible with delegate class " + temp[i] + " (index " + i + ")");
}
}
}
}
}
setNamePrefix(classes[ReflectUtils.findPackageProtected(classes)].getName());
return (Mixin)super.create(KEY_FACTORY.newInstance(style, ReflectUtils.getNames( classes ), route));
}
public void generateClass(ClassVisitor v) {
switch (style) {
case STYLE_INTERFACES:
new MixinEmitter(v, getClassName(), classes, route);
break;
case STYLE_BEANS:
new MixinBeanEmitter(v, getClassName(), classes);
break;
case STYLE_EVERYTHING:
new MixinEverythingEmitter(v, getClassName(), classes);
break;
}
}
protected Object firstInstance(Class type) {
return ((Mixin)ReflectUtils.newInstance(type)).newInstance(delegates);
}
protected Object nextInstance(Object instance) {
return ((Mixin)instance).newInstance(delegates);
}
}
public static Class[] getClasses(Object[] delegates) {
return (Class[])route(delegates).classes.clone();
}
// public static int[] getRoute(Object[] delegates) {
// return (int[])route(delegates).route.clone();
// }
private static Route route(Object[] delegates) {
Object key = ClassesKey.create(delegates);
Route route = (Route)ROUTE_CACHE.get(key);
if (route == null) {
ROUTE_CACHE.put(key, route = new Route(delegates));
}
return route;
}
private static class Route
{
private Class[] classes;
private int[] route;
Route(Object[] delegates) {
Map map = new HashMap();
ArrayList collect = new ArrayList();
for (int i = 0; i < delegates.length; i++) {
Class delegate = delegates[i].getClass();
collect.clear();
ReflectUtils.addAllInterfaces(delegate, collect);
for (Iterator it = collect.iterator(); it.hasNext();) {
Class iface = (Class)it.next();
if (!map.containsKey(iface)) {
map.put(iface, new Integer(i));
}
}
}
classes = new Class[map.size()];
route = new int[map.size()];
int index = 0;
for (Iterator it = map.keySet().iterator(); it.hasNext();) {
Class key = (Class)it.next();
classes[index] = key;
route[index] = ((Integer)map.get(key)).intValue();
index++;
}
}
}
}
