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Dahua ICC Open API SDK for Java
package com.dahuatech.hutool.core.lang;
import com.dahuatech.hutool.core.collection.CollUtil;
import com.dahuatech.hutool.core.collection.EnumerationIter;
import com.dahuatech.hutool.core.io.FileUtil;
import com.dahuatech.hutool.core.io.IORuntimeException;
import com.dahuatech.hutool.core.io.resource.ResourceUtil;
import com.dahuatech.hutool.core.util.*;
import java.io.File;
import java.io.IOException;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* 类扫描器
*
* @author looly
* @since 4.6.9
*/
public class ClassScanner implements Serializable {
private static final long serialVersionUID = 1L;
/** 包名 */
private String packageName;
/** 包名,最后跟一个点,表示包名,避免在检查前缀时的歧义 */
private String packageNameWithDot;
/** 包路径,用于文件中对路径操作 */
private String packageDirName;
/** 包路径,用于jar中对路径操作,在Linux下与packageDirName一致 */
private String packagePath;
/** 过滤器 */
private Filter> classFilter;
/** 编码 */
private Charset charset;
/** 类加载器 */
private ClassLoader classLoader;
/** 是否初始化类 */
private boolean initialize;
private Set> classes = new HashSet<>();
/** 构造,默认UTF-8编码 */
public ClassScanner() {
this(null);
}
/**
* 构造,默认UTF-8编码
*
* @param packageName 包名,所有包传入""或者null
*/
public ClassScanner(String packageName) {
this(packageName, null);
}
/**
* 构造,默认UTF-8编码
*
* @param packageName 包名,所有包传入""或者null
* @param classFilter 过滤器,无需传入null
*/
public ClassScanner(String packageName, Filter> classFilter) {
this(packageName, classFilter, CharsetUtil.CHARSET_UTF_8);
}
/**
* 构造
*
* @param packageName 包名,所有包传入""或者null
* @param classFilter 过滤器,无需传入null
* @param charset 编码
*/
public ClassScanner(String packageName, Filter> classFilter, Charset charset) {
packageName = StrUtil.nullToEmpty(packageName);
this.packageName = packageName;
this.packageNameWithDot = StrUtil.addSuffixIfNot(packageName, StrUtil.DOT);
this.packageDirName = packageName.replace(CharUtil.DOT, File.separatorChar);
this.packagePath = packageName.replace(CharUtil.DOT, CharUtil.SLASH);
this.classFilter = classFilter;
this.charset = charset;
}
/**
* 扫描指定包路径下所有包含指定注解的类
*
* @param packageName 包路径
* @param annotationClass 注解类
* @return 类集合
*/
public static Set> scanPackageByAnnotation(
String packageName, final Class extends Annotation> annotationClass) {
return scanPackage(
packageName,
new Filter>() {
@Override
public boolean accept(Class> clazz) {
return clazz.isAnnotationPresent(annotationClass);
}
});
}
/**
* 扫描指定包路径下所有指定类或接口的子类或实现类
*
* @param packageName 包路径
* @param superClass 父类或接口
* @return 类集合
*/
public static Set> scanPackageBySuper(String packageName, final Class> superClass) {
return scanPackage(
packageName,
new Filter>() {
@Override
public boolean accept(Class> clazz) {
return superClass.isAssignableFrom(clazz) && !superClass.equals(clazz);
}
});
}
/**
* 扫描该包路径下所有class文件
*
* @return 类集合
*/
public static Set> scanPackage() {
return scanPackage(StrUtil.EMPTY, null);
}
/**
* 扫描该包路径下所有class文件
*
* @param packageName 包路径 com | com. | com.abs | com.abs.
* @return 类集合
*/
public static Set> scanPackage(String packageName) {
return scanPackage(packageName, null);
}
/**
* 扫描包路径下满足class过滤器条件的所有class文件,
* 如果包路径为 com.abs + A.class 但是输入 abs会产生classNotFoundException
* 因为className 应该为 com.abs.A 现在却成为abs.A,此工具类对该异常进行忽略处理
*
* @param packageName 包路径 com | com. | com.abs | com.abs.
* @param classFilter class过滤器,过滤掉不需要的class
* @return 类集合
*/
public static Set> scanPackage(String packageName, Filter> classFilter) {
return new ClassScanner(packageName, classFilter).scan();
}
/**
* 扫描包路径下满足class过滤器条件的所有class文件
*
* @return 类集合
*/
public Set> scan() {
for (URL url : ResourceUtil.getResourceIter(this.packagePath)) {
switch (url.getProtocol()) {
case "file":
scanFile(new File(URLUtil.decode(url.getFile(), this.charset.name())), null);
break;
case "jar":
scanJar(URLUtil.getJarFile(url));
break;
}
}
if (CollUtil.isEmpty(this.classes)) {
scanJavaClassPaths();
}
return Collections.unmodifiableSet(this.classes);
}
/**
* 设置是否在扫描到类时初始化类
*
* @param initialize 是否初始化类
*/
public void setInitialize(boolean initialize) {
this.initialize = initialize;
}
/**
* 设置自定义的类加载器
*
* @param classLoader 类加载器
* @since 4.6.9
*/
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
// --------------------------------------------------------------------------------------------------- Private method start
/** 扫描Java指定的ClassPath路径 */
private void scanJavaClassPaths() {
final String[] javaClassPaths = ClassUtil.getJavaClassPaths();
for (String classPath : javaClassPaths) {
// bug修复,由于路径中空格和中文导致的Jar找不到
classPath = URLUtil.decode(classPath, CharsetUtil.systemCharsetName());
scanFile(new File(classPath), null);
}
}
/**
* 扫描文件或目录中的类
*
* @param file 文件或目录
* @param rootDir 包名对应classpath绝对路径
*/
private void scanFile(File file, String rootDir) {
if (file.isFile()) {
final String fileName = file.getAbsolutePath();
if (fileName.endsWith(FileUtil.CLASS_EXT)) {
final String className =
fileName //
// 8为classes长度,fileName.length() - 6为".class"的长度
.substring(rootDir.length(), fileName.length() - 6) //
.replace(File.separatorChar, CharUtil.DOT); //
// 加入满足条件的类
addIfAccept(className);
} else if (fileName.endsWith(FileUtil.JAR_FILE_EXT)) {
try {
scanJar(new JarFile(file));
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
} else if (file.isDirectory()) {
for (File subFile : file.listFiles()) {
scanFile(subFile, (null == rootDir) ? subPathBeforePackage(file) : rootDir);
}
}
}
/**
* 扫描jar包
*
* @param jar jar包
*/
private void scanJar(JarFile jar) {
String name;
for (JarEntry entry : new EnumerationIter<>(jar.entries())) {
name = StrUtil.removePrefix(entry.getName(), StrUtil.SLASH);
if (name.startsWith(this.packagePath)) {
if (name.endsWith(FileUtil.CLASS_EXT) && false == entry.isDirectory()) {
final String className =
name //
.substring(0, name.length() - 6) //
.replace(CharUtil.SLASH, CharUtil.DOT); //
addIfAccept(loadClass(className));
}
}
}
}
/**
* 加载类
*
* @param className 类名
* @return 加载的类
*/
private Class> loadClass(String className) {
ClassLoader loader = this.classLoader;
if (null == loader) {
loader = ClassLoaderUtil.getClassLoader();
this.classLoader = loader;
}
Class> clazz = null;
try {
clazz = Class.forName(className, this.initialize, loader);
} catch (NoClassDefFoundError e) {
// 由于依赖库导致的类无法加载,直接跳过此类
} catch (UnsupportedClassVersionError e) {
// 版本导致的不兼容的类,跳过
} catch (Exception e) {
throw new RuntimeException(e);
// Console.error(e);
}
return clazz;
}
/**
* 通过过滤器,是否满足接受此类的条件
*
* @param className 类名
*/
private void addIfAccept(String className) {
if (StrUtil.isBlank(className)) {
return;
}
int classLen = className.length();
int packageLen = this.packageName.length();
if (classLen == packageLen) {
// 类名和包名长度一致,用户可能传入的包名是类名
if (className.equals(this.packageName)) {
addIfAccept(loadClass(className));
}
} else if (classLen > packageLen) {
// 检查类名是否以指定包名为前缀,包名后加.(避免类似于com.dahuatech.hutool.A和com.dahuatech.hutool.ATest这类类名引起的歧义)
if (className.startsWith(this.packageNameWithDot)) {
addIfAccept(loadClass(className));
}
}
}
/**
* 通过过滤器,是否满足接受此类的条件
*
* @param clazz 类
*/
private void addIfAccept(Class> clazz) {
if (null != clazz) {
Filter> classFilter = this.classFilter;
if (classFilter == null || classFilter.accept(clazz)) {
this.classes.add(clazz);
}
}
}
/**
* 截取文件绝对路径中包名之前的部分
*
* @param file 文件
* @return 包名之前的部分
*/
private String subPathBeforePackage(File file) {
String filePath = file.getAbsolutePath();
if (StrUtil.isNotEmpty(this.packageDirName)) {
filePath = StrUtil.subBefore(filePath, this.packageDirName, true);
}
return StrUtil.addSuffixIfNot(filePath, File.separator);
}
// --------------------------------------------------------------------------------------------------- Private method end
}