com.wabacus.util.WabacusClassLoader.java Source code

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Here is the source code for com.wabacus.util.WabacusClassLoader.java

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/* 
 * Copyright (C) 2010---2014 (wuweixing)<349446658@qq.com>
 * 
 * This file is part of Wabacus 
 * 
 * Wabacus is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.wabacus.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.StringTokenizer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.wabacus.exception.WabacusConfigLoadingException;

public class WabacusClassLoader extends ClassLoader {
    private static Log log = LogFactory.getLog(WabacusClassLoader.class);

    private ClassLoader parentLoader;

    private List<String> classRepository = new ArrayList<String>();

    public WabacusClassLoader(ClassLoader parent) {
        super(parent);
        parentLoader = parent;
        if (parent == null)
            throw new IllegalArgumentException("??!");
    }

    public synchronized Class loadClass(String name) throws ClassNotFoundException {
        return loadClass(name, false);
    }

    protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException {
        Class c = findLoadedClass(name);
        ClassNotFoundException ex = null;
        if (c == null && parentLoader != null) {
            try {
                c = parentLoader.loadClass(name);
            } catch (ClassNotFoundException e) {
                ex = e;
            }
        }
        if (c == null) {
            try {
                c = this.findSystemClass(name);
            } catch (ClassNotFoundException e) {
                ex = e;
            }
        }
        if (c == null) {
            throw ex;
        }

        if (resolve) {
            resolveClass(c);
        }
        return c;

    }

    public synchronized Class loadClass(String className, byte[] classBytes) {
        if (classBytes == null || className == null || className.trim().equals("")) {
            return null;
        }
        return this.defineClass(className, classBytes, 0, classBytes.length);

    }

    public void addClassPath(String strClassPath) {
        if (classRepository == null)
            classRepository = new ArrayList<String>();
        if ((strClassPath != null) && !(strClassPath.equals(""))) {
            StringTokenizer tokenizer = new StringTokenizer(strClassPath, File.pathSeparator);
            while (tokenizer.hasMoreTokens()) {
                classRepository.add(tokenizer.nextToken());
            }
        }
    }

    public synchronized Class loadClassFromClassPath(String className) {

        Iterator<String> dirs = classRepository.iterator();
        byte[] classBytes = null;

        while (dirs.hasNext()) {
            String dir = (String) dirs.next();

            String classFileName = className.replace('.', File.separatorChar);
            classFileName += ".class";
            try {
                File file = new File(dir + File.separatorChar + classFileName);
                if (file.exists()) {
                    InputStream is = new FileInputStream(file);
                    classBytes = new byte[is.available()];
                    is.read(classBytes);
                    break;
                }
            } catch (IOException ex) {

                ex.printStackTrace();
                return null;
            }
        }
        return this.defineClass(className, classBytes, 0, classBytes.length);
    }

    public Class loadClassByCurrentLoader(String classname) {
        if (classname == null || classname.trim().equals(""))
            return null;
        /* ClassLoader contextClassLoader=Thread.currentThread().getContextClassLoader();
         if(contextClassLoader==null)  contextClassLoader=WabacusClassLoader.class.getClassLoader();
         try
         {
        return contextClassLoader.loadClass(classname);
         }catch(ClassNotFoundException e)
         {
        throw new WabacusConfigLoadingException(""+classname+"!",e);
         }*/
        try {
            return this.loadClass(classname);
        } catch (ClassNotFoundException e) {
            throw new WabacusConfigLoadingException("" + classname + "!", e);
        }

    }
}