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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 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 }




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