ScanJar.java :  » IDE-Netbeans » classfile » regression » Java Open Source

/*
 * ScanJar.java
 *
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 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
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 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
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 * particular file as subject to the "Classpath" exception as provided
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 * Contributor(s):
 *
 * The Original Software is NetBeans. The Initial Developer of the Original
 * Software is Sun Microsystems, Inc. Portions Copyright 2000-2001 Sun
 * Microsystems, Inc. All Rights Reserved.
 *
 * If you wish your version of this file to be governed by only the CDDL
 * or only the GPL Version 2, indicate your decision by adding
 * "[Contributor] elects to include this software in this distribution
 * under the [CDDL or GPL Version 2] license." If you do not indicate a
 * single choice of license, a recipient has the option to distribute
 * your version of this file under either the CDDL, the GPL Version 2 or
 * to extend the choice of license to its licensees as provided above.
 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
 * made subject to such option by the copyright holder.
 *
 * Contributor(s): Thomas Ball
 *
 * Version: $Revision$
 */

import org.netbeans.modules.classfile.*;
import java.io.*;
import java.util.*;
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;

/**
 * ScanJar:  load all of the classes of a specified jar file,
 * useful for performance and regression testing.
 *
 * @author Thomas Ball
 */
public class ScanJar {
    String jarName;
    boolean includeCode;
    boolean toString;

    public static void main(String[] args) {
  boolean includeCode = false;
  boolean toString = false;
        if (args.length == 0)
            usage();
        for (int i = 0; i < args.length; i++) {
      if (args[i].equals("-includeCode"))
    includeCode = true;
      else if (args[i].equals("-toString"))
    toString = true;
            else if (args[i].charAt(0) == '-')
                usage();
            else {
                try {
                    ScanJar sj = new ScanJar(args[i], includeCode, toString);
        System.out.print("scanning " + args[i]);
        if (includeCode || toString) {
      System.out.print(": ");
      if (includeCode)
          System.out.print("includeCode ");
      if (toString)
          System.out.print("toString");
        }
        System.out.println();
        ElapsedTimer timer = new ElapsedTimer();
        int n = sj.scan();
        System.out.println("scanned " + n + " files in " + 
               timer.toString());
                } catch (IOException e) {
                    System.err.println("error accessing \"" + args[i] + 
                                       "\": " + e.toString());
                }
            }
        }
    }

    ScanJar(String name, boolean incl, boolean tos) {
  jarName = name;
  includeCode = incl;
  toString = tos;
    }

    /**
     * Reads  class entries from the jar file into ClassFile instances.
     * Returns the number of classes scanned.
     */
    public int scan() throws IOException {
  int n = 0;
  ZipFile zf = new ZipFile(jarName);
  Enumeration files = zf.entries();
  while (files.hasMoreElements()) {
      ZipEntry entry = (ZipEntry)files.nextElement();
      String name = entry.getName();
      if (name.endsWith(".class")) {
                InputStream in = zf.getInputStream(entry);
                ClassFile cf = new ClassFile(in, includeCode);
                if (toString)
                    try {
                        cf.toString(); // forces loading of attributes.
                    } catch (InvalidClassFileAttributeException ex) {
                        System.out.println("error accessing " + name);
                        throw ex;
                    }
                in.close();
    n++;
      }
  }
  zf.close();
  return n;
    }

    public static void usage() {
        System.err.println("usage:  java ScanJar [-includeCode] " + 
         "[-toString] <jar file> [ <jar file> ...]");
        System.exit(1);
    }
}