/*
* Copyright Beijing 58 Information Technology Co.,Ltd.
*
* 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 com.bj58.spat.gaea.server.util;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtMethod;
import javassist.Modifier;
import javassist.bytecode.CodeAttribute;
import javassist.bytecode.LocalVariableAttribute;
import javassist.bytecode.MethodInfo;
import com.bj58.spat.gaea.server.deploy.hotdeploy.DynamicClassLoader;
/**
*
* @author Service Platform Architecture Team (spat@58.com)
*/
public class ClassHelper {
/**
* get all class from jar
* @param jarPath
* @param classLoader
* @return
* @throws IOException
* @throws ClassNotFoundException
*/
public static Set<Class<?>> getClassFromJar(String jarPath,
DynamicClassLoader classLoader) throws IOException, ClassNotFoundException {
JarFile jarFile = new JarFile(jarPath);
Enumeration<JarEntry> entries = jarFile.entries();
Set<Class<?>> classes = new LinkedHashSet<Class<?>>();
while (entries.hasMoreElements()) {
JarEntry jarEntry = entries.nextElement();
String name = jarEntry.getName();
if (name.endsWith(".class")) {
String className = name.replaceAll(".class", "").replaceAll("/", ".");
Class<?> cls = null;
try {
// cls = classLoader.findClass(className);
cls = classLoader.loadClass(className);
} catch (Throwable ex) {
}
if (cls != null) {
classes.add(cls);
}
}
}
return classes;
}
/**
* check class is implements the interface
* @param type
* @param interfaceType
* @return
*/
public static boolean interfaceOf(Class<?> type, Class<?> interfaceType) {
if (type == null) {
return false;
}
Class<?>[] interfaces = type.getInterfaces();
for (Class<?> c : interfaces) {
if (c.equals(interfaceType)) {
return true;
}
}
return false;
}
/**
* get method parameter names
* @param cls
* @param method
* @return
* @throws Exception
*/
public static String[] getParamNames(Class<?> cls, Method method) throws Exception {
ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.get(cls.getName());
Class<?>[] paramAry = method.getParameterTypes();
String[] paramTypeNames = new String[paramAry.length];
for(int i=0; i<paramAry.length; i++) {
paramTypeNames[i] = paramAry[i].getName();
}
CtMethod cm = cc.getDeclaredMethod(method.getName(), pool.get(paramTypeNames));
MethodInfo methodInfo = cm.getMethodInfo();
CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
if (attr == null) {
throw new Exception("class:"+cls.getName()+", have no LocalVariableTable, please use javac -g:{vars} to compile the source file");
}
String[] paramNames = new String[cm.getParameterTypes().length];
int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;
for (int i = 0; i < paramNames.length; i++) {
paramNames[i] = attr.variableName(i + pos);
}
return paramNames;
}
/**
* get method parameters annotations
* @param cls
* @param method
* @return
* @throws Exception
*/
public static Object[][] getParamAnnotations(Class<?> cls, Method method) throws Exception {
ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.get(cls.getName());
Class<?>[] paramAry = method.getParameterTypes();
String[] paramTypeNames = new String[paramAry.length];
for(int i=0; i<paramAry.length; i++) {
paramTypeNames[i] = paramAry[i].getName();
}
CtMethod cm = cc.getDeclaredMethod(method.getName(), pool.get(paramTypeNames));
return cm.getParameterAnnotations();
}
}