| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * 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 com.intellij.vcsUtil; |
| |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.util.*; |
| |
| /** |
| * Created with IntelliJ IDEA. |
| * User: Irina.Chernushina |
| * Date: 10/19/12 |
| * Time: 12:42 PM |
| */ |
| public abstract class LearningProxy<T, E extends Throwable> { |
| private final static Map<String, Object> ourDefaultValues = new HashMap<String, Object>(); |
| static { |
| ourDefaultValues.put("byte", new Byte((byte) 0)); |
| ourDefaultValues.put("char", new Character('m')); |
| ourDefaultValues.put("double", new Double(1)); |
| ourDefaultValues.put("float", new Float(1f)); |
| ourDefaultValues.put("int", new Integer(0)); |
| ourDefaultValues.put("long", new Long(0)); |
| ourDefaultValues.put("short", new Short((short) 0)); |
| ourDefaultValues.put("boolean", Boolean.FALSE); |
| ourDefaultValues.put("void", null); |
| } |
| private final Set<MethodDescriptor> myTrackedMethods; |
| private final InvocationHandler myLearn; |
| |
| public LearningProxy() { |
| myTrackedMethods = new HashSet<MethodDescriptor>(); |
| myLearn = new InvocationHandler() { |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| myTrackedMethods.add(new MethodDescriptor(method)); |
| final Class<?> returnType = method.getReturnType(); |
| if (returnType.isPrimitive()) { |
| return ourDefaultValues.get(returnType.getName()); |
| } |
| return null; |
| } |
| }; |
| } |
| |
| protected abstract void onBefore() throws E; |
| protected abstract void onAfter() throws E; |
| |
| public <T> T create(Class<T> clazz, final T t) { |
| return (T) Proxy.newProxyInstance(clazz.getClassLoader(), new Class[]{clazz}, new InvocationHandler() { |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| final MethodDescriptor current = new MethodDescriptor(method); |
| if (myTrackedMethods.contains(current)) { |
| try { |
| onBefore(); |
| method.setAccessible(true); |
| return method.invoke(t, args); |
| } finally { |
| onAfter(); |
| } |
| } |
| return method.invoke(t, args); |
| } |
| }); |
| } |
| |
| public <T> T learn(Class<T> clazz) { |
| return (T) Proxy.newProxyInstance(clazz.getClassLoader(), new Class[]{clazz}, myLearn); |
| } |
| |
| private static class MethodDescriptor { |
| @NotNull |
| private final String myMethodName; |
| @NotNull |
| private final List<String> myParameters; |
| |
| private MethodDescriptor(final Method method) { |
| myMethodName = method.getName(); |
| final Class<?>[] types = method.getParameterTypes(); |
| myParameters = new ArrayList<String>(types.length); |
| for (Class<?> type : types) { |
| myParameters.add(type.getName()); |
| } |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| MethodDescriptor that = (MethodDescriptor)o; |
| |
| if (!myMethodName.equals(that.myMethodName)) return false; |
| if (!myParameters.equals(that.myParameters)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = myMethodName.hashCode(); |
| result = 31 * result + myParameters.hashCode(); |
| return result; |
| } |
| } |
| } |