package org.jrest4guice.commons.lang;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
*
* @author <a href="mailto:zhangyouqun@gmail.com">cnoss (QQ:86895156)</a>
*
*/
public class ClassUtils {
private static final String PROTOCOL_FILE = "file";
private static final String PROTOCOL_JAR = "jar";
private static final String PREFIX_FILE = "file:";
private static final String JAR_URL_SEPERATOR = "!/";
private static final String CLASS_FILE = ".class";
private final static Log log = LogFactory.getLog(ClassUtils.class);
public static List<Class<?>> getClasses(String packageName) {
List<Class<?>> list = new ArrayList<Class<?>>();
Enumeration<URL> en = null;
try {
en = ClassUtils.class.getClassLoader().getResources(nameToPath(packageName));
while (en.hasMoreElements()) {
URL url = en.nextElement();
if (PROTOCOL_FILE.equals(url.getProtocol())) {
File root = new File(url.getFile());
findInDirectory(list, root, root, packageName);
} else if (PROTOCOL_JAR.equals(url.getProtocol()))
findInJar(list, getJarFile(url), packageName);
}
} catch (IOException e) {
log.error("无效的包名:" + packageName, e.getCause());
}
return list;
}
public static File getJarFile(URL url) {
String file = url.getFile();
if (file.startsWith(PREFIX_FILE))
file = file.substring(PREFIX_FILE.length());
int end = file.indexOf(JAR_URL_SEPERATOR);
if (end != (-1))
file = file.substring(0, end);
return new File(file);
}
private static void findInDirectory(List<Class<?>> results, File rootDir, File dir, String packageName) {
File[] files = dir.listFiles();
String rootPath = rootDir.getPath();
for (File file : files)
if (file.isFile()) {
String classFileName = file.getPath();
if (classFileName.endsWith(CLASS_FILE)) {
String className = classFileName.substring(rootPath.length() - packageName.length(), classFileName
.length()
- CLASS_FILE.length());
try {
Class<?> clz = Class.forName(pathToName(className));
results.add(clz);
} catch (ClassNotFoundException e) {
log.error("无法获取类:" + className, e.getCause()); // 该错误应该不会出现
}
}
} else if (file.isDirectory())
findInDirectory(results, rootDir, file, packageName);
}
private static void findInJar(List<Class<?>> results, File file, String packageName) {
JarFile jarFile = null;
String packagePath = nameToPath(packageName) + "/";
try {
jarFile = new JarFile(file);
Enumeration<JarEntry> en = jarFile.entries();
while (en.hasMoreElements()) {
JarEntry je = en.nextElement();
String name = je.getName();
if (name.startsWith(packagePath) && name.endsWith(CLASS_FILE)) {
String className = name.substring(0, name.length() - CLASS_FILE.length());
try {
Class<?> clz = Class.forName(pathToName(className));
results.add(clz);
} catch (ClassNotFoundException e) {
log.error("无法获取类:" + className, e.getCause()); // 该错误应该不会出现
}
}
}
} catch (IOException e) {
log.error("无法读取 Jar 文件:" + file.getName(), e);
} finally {
if (jarFile != null)
try {
jarFile.close();
} catch (IOException e) {
}
}
}
/**
* 将类名的字符串形式转换为路径表现形式
* @param className 类名
* @return 路径的字符串
*/
private static String nameToPath(String className) {
return className.replace('.', '/');
}
/**
* 将路径转换为类的字符串表现形式
* @param path
* @return 类名的字符串形式
*/
private static String pathToName(String path) {
return path.replace('/', '.').replace('\\', '.');
}
public static List<Method> getSortedMethodList(Class<?> clazz){
List<Method> methods = Arrays.asList(clazz.getDeclaredMethods());
Collections.sort(methods, new Comparator<Method>() {
@Override
public int compare(Method m1, Method m2) {
String lower1 = m1.toString().toLowerCase();
String lower2 = m2.toString().toLowerCase();
return lower1.compareTo(lower2);
}
});
return methods;
}
}