Encapsulates a class serialVersionUID and codebase. : Class « Reflection « Java

1. Java
2. Reflection
3. Class

Encapsulates a class serialVersionUID and codebase.

     
/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2008, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.io.ObjectStreamClass;
import java.io.Serializable;
import java.net.URL;
import java.security.CodeSource;

/**
 * Encapsulates a class serialVersionUID and codebase.
 * 
 * @author Scott.Stark@jboss.org
 * @version $Revision: 81038 $
 */
public class ClassVersionInfo implements Serializable {
  static final long serialVersionUID = 2036506209171911437L;

  /** The named class serialVersionUID as returned by ObjectStreamClass */
  private long serialVersion;

  /** The binary class name */
  private String name;

  private boolean hasExplicitSerialVersionUID;

  private transient URL location;

  public ClassVersionInfo(String name, ClassLoader loader) throws ClassNotFoundException {
    this.name = name;
    Class c = loader.loadClass(name);
    CodeSource cs = c.getProtectionDomain().getCodeSource();
    if (cs != null)
      location = cs.getLocation();
    if (c.isInterface() == false) {
      ObjectStreamClass osc = ObjectStreamClass.lookup(c);
      if (osc != null) {
        serialVersion = osc.getSerialVersionUID();
        try {
          c.getDeclaredField("serialVersionUID");
          hasExplicitSerialVersionUID = true;
        } catch (NoSuchFieldException e) {
          hasExplicitSerialVersionUID = false;
        }
      }
    }
  }

  public long getSerialVersion() {
    return serialVersion;
  }

  public boolean getHasExplicitSerialVersionUID() {
    return hasExplicitSerialVersionUID;
  }

  public String getName() {
    return name;
  }

  public String toString() {
    StringBuffer tmp = new StringBuffer("ClassVersionInfo");
    tmp.append('{');
    tmp.append("serialVersion=");
    tmp.append(serialVersion);
    tmp.append(", hasExplicitSerialVersionUID=");
    tmp.append(hasExplicitSerialVersionUID);
    tmp.append(", name=");
    tmp.append(name);
    tmp.append(", location=");
    tmp.append(location);
    tmp.append('}');
    return tmp.toString();
  }

  /**
   * Usage: ClassVersionInfo class-name
   * 
   * Locate the class name on the thread context class loader classpath and
   * print its version info.
   * 
   * @param args
   *          [0] = class-name
   */
  public static void main(String[] args) throws Exception {
    if (args.length == 0)
      throw new IllegalStateException("Usage: ...ClassVersionInfo class-name");
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    ClassVersionInfo info = new ClassVersionInfo(args[0], loader);
    System.out.println(info);
  }
}

   
    
    
    
    
  

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