JPF_java_net_URLClassLoader.java

//
// Copyright (C) 2012 United States Government as represented by the
// Administrator of the National Aeronautics and Space Administration
// (NASA).  All Rights Reserved.
// 
// This software is distributed under the NASA Open Source Agreement
// (NOSA), version 1.3.  The NOSA has been approved by the Open Source
// Initiative.  See the file NOSA-1.3-JPF at the top of the distribution
// directory tree for the complete NOSA document.
// 
// THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY
// KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT
// LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO
// SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR
// A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT
// THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT
// DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE.
//
package gov.nasa.jpf.vm;

import gov.nasa.jpf.JPF;
import gov.nasa.jpf.annotation.MJI;
import gov.nasa.jpf.util.JPFLogger;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;

import de.fosd.typechef.featureexpr.FeatureExpr;

/**
 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
 * 
 * Native peer for java.net.URLClassLoader
 */
@SuppressWarnings("deprecation")
public class JPF_java_net_URLClassLoader extends JPF_java_lang_ClassLoader{

  static JPFLogger log = JPF.getLogger("class");
  
  @MJI
  public void addURL0__Ljava_lang_String_2__V (MJIEnv env, int objRef, int urlRef, FeatureExpr ctx) throws MalformedURLException {
    ClassLoaderInfo cl = env.getClassLoaderInfo(objRef);
    String url = env.getStringObject(ctx, urlRef);

    String path = null;
    URL u = new URL(url);
    String protocol = u.getProtocol();
    if(protocol.equals("file")) {
      path = u.getFile();
    } else if(protocol.equals("jar")){
      path = url.substring(url.lastIndexOf(':')+1, url.indexOf('!'));
    } else {
      // we don't support other protocols for now!
      log.warning("unknown path element specification: ", url);
      return;
    }

    cl.addClassPathElement(path);
    // Always add the system classpath
    String v = System.getProperty("sun.boot.class.path");
    if (v != null) {
      for (String pn : v.split(File.pathSeparator)) {
        cl.addClassPathElement(pn);
      }
    }
  }

  @MJI
  public int findClass__Ljava_lang_String_2__Ljava_lang_Class_2 (MJIEnv env, int objRef, int nameRef, FeatureExpr ctx) {
    String typeName = env.getStringObject(ctx, nameRef);
    ClassLoaderInfo cl = env.getClassLoaderInfo(objRef);
//    ThreadInfo ti = env.getThreadInfo();

    try {
      ClassInfo ci = cl.getResolvedClassInfo( ctx, typeName);
      if(!ci.isRegistered()) {
        ci.registerClass(ctx, env.getThreadInfo());
      }
      // note that we don't initialize yet
      return ci.getClassObjectRef();
          
    } catch (LoadOnJPFRequired rre) { // this classloader has a overridden loadClass 
      env.repeatInvocation();
      return MJIEnv.NULL;
      
    } catch (ClassInfoException cix){
      if (cix.getCause() instanceof ClassParseException){
        env.throwException(ctx, "java.lang.ClassFormatError", typeName);
      } else {
        env.throwException(ctx, "java.lang.ClassNotFoundException", typeName);
      }
      return MJIEnv.NULL;      
    }
  }

  @MJI
  public int findResource0__Ljava_lang_String_2__Ljava_lang_String_2 (MJIEnv env, int objRef, int resRef, FeatureExpr ctx){
    String rname = env.getStringObject(ctx, resRef);

    ClassLoaderInfo cl = env.getClassLoaderInfo(objRef);

    String resourcePath = cl.findResource(rname);

    return env.newString(ctx, resourcePath);
  }

  @MJI
  public int findResources0__Ljava_lang_String_2___3Ljava_lang_String_2 (MJIEnv env, int objRef, int resRef, FeatureExpr ctx) {
    String rname = env.getStringObject(ctx, resRef);

    ClassLoaderInfo cl = env.getClassLoaderInfo(objRef);

    String[] resources = cl.findResources(rname);

    return env.newStringArray(ctx, resources);
  }
}