Mega Code Archive
Encapsulates a class serialVersionUID and codebase
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/*
* 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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