org.javaweb.utils.ClassUtils.java Source code

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Here is the source code for org.javaweb.utils.ClassUtils.java

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/*
 * Copyright yz 2016-01-14  Email:admin@javaweb.org.
 *
 * 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 org.javaweb.utils;

import org.apache.commons.beanutils.PropertyUtilsBean;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;

import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class ClassUtils extends org.apache.commons.lang.ClassUtils {

    /**
     * ?
     *
     * @param f
     * @param path
     * @param ls
     */
    public static void findAllClassFile(File f, String path, Set<String> ls) {
        if (f.isDirectory()) {
            File[] files = f.listFiles();
            for (File file : files) {
                findAllClassFile(file, path, ls);
            }
        } else {
            String fileString = f.toString();

            // class
            if (fileString.endsWith(".class")) {
                String classPath = fileString.substring(path.length());
                classPath = classPath.replaceAll("\\\\+", "/").replaceAll("/+", "/").replaceAll("^/", "");
                ls.add(classPath.substring(0, classPath.length() - ".class".length()));
            }
        }
    }

    public static void getAllJarClass(File file, Set<String> classList) throws IOException {
        if (file.isDirectory()) {
            getAllJarClass(file, classList);
        } else {
            if (file.getName().endsWith(".jar")) {
                getAllJarClass(file.toURI().toURL(), classList);
            }
        }
    }

    /**
     * ?jarclass
     *
     * @param url
     * @param classList
     * @throws IOException
     */
    public static void getAllJarClass(URL url, Set<String> classList) throws IOException {
        if (url != null) {
            JarURLConnection juc = (JarURLConnection) url.openConnection();
            JarFile jf = juc.getJarFile();
            Enumeration<JarEntry> je = jf.entries();

            while (je.hasMoreElements()) {
                JarEntry jar = je.nextElement();

                if (jar.getName().endsWith(".class")) {
                    String classPath = jar.getName().replaceAll("\\\\", "/").replaceAll("/+", ".");
                    classList.add(classPath.substring(0, classPath.length() - ".class".length()));
                }
            }
        }
    }

    /**
     * ??jarclass
     *
     * @return classList ????
     * @throws IOException
     */
    public static Set<String> getAllClass() throws IOException {
        Set<String> classList = new LinkedHashSet<String>();
        ClassUtils classUtils = new ClassUtils();
        URL url = classUtils.getClass().getProtectionDomain().getCodeSource().getLocation();

        try {
            if (!"http".equalsIgnoreCase(url.toURI().getScheme()) && new File(url.toURI()).isDirectory()) {
                File f = new File(url.toURI());
                findAllClassFile(f, f.toString(), classList);
            } else {
                getAllJarClass(url, classList);
            }
        } catch (URISyntaxException e) {
            e.printStackTrace();
        } catch (IOException e) {
            throw e;
        }

        return classList;
    }

    /**
     * ??
     *
     * @param cr
     * @return
     */
    public static boolean isInterface(ClassReader cr) {
        return (cr.getAccess() & Opcodes.ACC_INTERFACE) != 0;
    }

    /**
     * ?java
     *
     * @param cr
     * @return
     */
    public static int getClassVersion(ClassReader cr) {
        return cr.readUnsignedShort(6);
    }

    private static boolean shouldComputeFrames(ClassReader cr) {
        return getClassVersion(cr) >= 50;
    }

    public static ClassWriter getClassWriter(ClassReader cr, ClassLoader classLoader) {
        int writerFlags = 1;

        if (shouldComputeFrames(cr)) {
            writerFlags = 2;
        }

        return new ClassWriter(cr, writerFlags);
    }

    /**
     * ?java?Map
     *
     * @param obj
     * @return
     */
    public static Map<String, Object> serializeClassToMap(Object obj) {
        Map<String, Object> params = new HashMap<String, Object>(0);

        try {
            PropertyUtilsBean propertyUtilsBean = new PropertyUtilsBean();
            PropertyDescriptor[] descriptors = propertyUtilsBean.getPropertyDescriptors(obj);

            for (int i = 0; i < descriptors.length; i++) {
                String name = descriptors[i].getName();

                if (!"class".equals(name)) {
                    params.put(name, propertyUtilsBean.getNestedProperty(obj, name));
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return params;
    }

}