com.sun.org.apache.bcel.internal.classfile.JavaClass Java Examples

/**
     * Find an already defined (cached) JavaClass object by name.
     */
    @Override
    public JavaClass findClass(final String className) {
        final SoftReference<JavaClass> ref = loadedClasses.get(className);
        if (ref == null) {
            return null;
}
        return ref.get();
    }
 

/**
 * Java Virtual Machine Specification edition 2, 5.4.4 Access Control
 */
public boolean accessibleTo(ObjectType accessor) {
  JavaClass jc = Repository.lookupClass(class_name);

  if(jc.isPublic()) {
    return true;
  } else {
    JavaClass acc = Repository.lookupClass(accessor.class_name);
    return acc.getPackageName().equals(jc.getPackageName());
  }
}
 

public void dumpClass(JavaClass clazz) {

        if (_outputType == BYTEARRAY_AND_FILE_OUTPUT)
        {
            File outFile = getOutputFile(clazz.getClassName());
            String parentDir = outFile.getParent();
            if (parentDir != null) {
                File parentFile = new File(parentDir);
                if (!SecuritySupport.doesFileExist(parentFile))
                    parentFile.mkdirs();
            }
        }

        try {
            switch (_outputType) {
            case JAR_OUTPUT:
                _bcelClasses.add(clazz);
                break;
            case BYTEARRAY_OUTPUT:
            case BYTEARRAY_AND_FILE_OUTPUT:
            case BYTEARRAY_AND_JAR_OUTPUT:
            case CLASSLOADER_OUTPUT:
                ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
                clazz.dump(out);
                _classes.add(out);

                if (_outputType == BYTEARRAY_AND_FILE_OUTPUT)
                  clazz.dump(getOutputFile(clazz.getClassName()));
                else if (_outputType == BYTEARRAY_AND_JAR_OUTPUT)
                  _bcelClasses.add(clazz);

                break;
            }
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
 

/**
 * Generate output JAR-file and packages
 */
public void outputToJar() throws IOException {
    // create the manifest
    final Manifest manifest = new Manifest();
    final java.util.jar.Attributes atrs = manifest.getMainAttributes();
    atrs.put(java.util.jar.Attributes.Name.MANIFEST_VERSION, "1.2");

    final Map<String, Attributes> map = manifest.getEntries();
    // create manifest
    final String now = (new Date()).toString();
    final java.util.jar.Attributes.Name dateAttr =
        new java.util.jar.Attributes.Name("Date");

    final File jarFile = new File(_destDir, _jarFileName);
    final JarOutputStream jos =
        new JarOutputStream(new FileOutputStream(jarFile), manifest);

    for (JavaClass clazz : _bcelClasses) {
        final String className = clazz.getClassName().replace('.', '/');
        final java.util.jar.Attributes attr = new java.util.jar.Attributes();
        attr.put(dateAttr, now);
        map.put(className + ".class", attr);
        jos.putNextEntry(new JarEntry(className + ".class"));
        final ByteArrayOutputStream out = new ByteArrayOutputStream(2048);
        clazz.dump(out); // dump() closes it's output stream
        out.writeTo(jos);
    }
    jos.close();
}
 

/**
 * Java Virtual Machine Specification edition 2, 5.4.4 Access Control
 */
public boolean accessibleTo(ObjectType accessor) {
  JavaClass jc = Repository.lookupClass(class_name);

  if(jc.isPublic()) {
    return true;
  } else {
    JavaClass acc = Repository.lookupClass(accessor.class_name);
    return acc.getPackageName().equals(jc.getPackageName());
  }
}
 

public boolean add(JavaClass clazz) {
  boolean result = false;

  if(!_map.containsKey(clazz.getClassName())) {
    result = true;
    _map.put(clazz.getClassName(), clazz);
  }

  return result;
}
 

/**
 * If "this" doesn't reference a class, it references an interface
 * or a non-existant entity.
 */
public boolean referencesClass(){
  JavaClass jc = Repository.lookupClass(class_name);
  if (jc == null)
    return false;
  else
    return jc.isClass();
}
 

/**
 * If "this" doesn't reference a class, it references an interface
 * or a non-existant entity.
 */
public boolean referencesClass(){
  JavaClass jc = Repository.lookupClass(class_name);
  if (jc == null)
    return false;
  else
    return jc.isClass();
}
 

public boolean add(JavaClass clazz) {
  boolean result = false;

  if(!_map.containsKey(clazz.getClassName())) {
    result = true;
    _map.put(clazz.getClassName(), clazz);
  }

  return result;
}
 

/**
 * If "this" doesn't reference an interface, it references a class
 * or a non-existant entity.
 */
public boolean referencesInterface(){
  JavaClass jc = Repository.lookupClass(class_name);
  if (jc == null)
    return false;
  else
    return !jc.isClass();
}
 

/**
 * If "this" doesn't reference a class, it references an interface
 * or a non-existant entity.
 */
public boolean referencesClass(){
  JavaClass jc = Repository.lookupClass(class_name);
  if (jc == null)
    return false;
  else
    return jc.isClass();
}
 

/**
 * Write contents of the given JavaClass into HTML files.
 *
 * @param java_class The class to write
 * @param dir The directory to put the files in
 */
public Class2HTML(final JavaClass java_class, final String dir) throws IOException {
    final Method[] methods = java_class.getMethods();
    this.java_class = java_class;
    this.dir = dir;
    class_name = java_class.getClassName(); // Remember full name
    constant_pool = java_class.getConstantPool();
    // Get package name by tacking off everything after the last `.'
    final int index = class_name.lastIndexOf('.');
    if (index > -1) {
        class_package = class_name.substring(0, index);
    } else {
        class_package = ""; // default package
    }
    final ConstantHTML constant_html = new ConstantHTML(dir, class_name, class_package, methods,
            constant_pool);
    /* Attributes can't be written in one step, so we just open a file
     * which will be written consequently.
     */
    final AttributeHTML attribute_html = new AttributeHTML(dir, class_name, constant_pool,
            constant_html);
    new MethodHTML(dir, class_name, methods, java_class.getFields(),
            constant_html, attribute_html);
    // Write main file (with frames, yuk)
    writeMainHTML(attribute_html);
    new CodeHTML(dir, class_name, methods, constant_pool, constant_html);
    attribute_html.close();
}
 

public JavaClass[] toArray() {
  Collection values = _map.values();
  JavaClass[] classes = new JavaClass[values.size()];
  values.toArray(classes);
  return classes;
}
 

public JavaClass dequeue()                {
  return (JavaClass)vec.removeFirst();
}
 

/**
 * Add clazz to repository if there isn't an equally named class already in there.
 *
 * @return old entry in repository
 */
public static JavaClass addClass(JavaClass clazz) {
  JavaClass old = _repository.findClass(clazz.getClassName());
  _repository.storeClass(clazz);
  return old;
}
 

/**
 * Try to find class source via getResourceAsStream().
 * @see Class
 * @return JavaClass object for given runtime class
 */
public static JavaClass lookupClass(Class clazz) {
  try {
    return _repository.loadClass(clazz);
  } catch(ClassNotFoundException ex) { return null; }
}
 

/** @param clazz Java class to "decompile"
 * @param out where to output Java program
 */
public BCELifier(final JavaClass clazz, final OutputStream out) {
    _clazz = clazz;
    _out = new PrintWriter(out);
    _cp = new ConstantPoolGen(_clazz.getConstantPool());
}
 

/**
 * @return true, if clazz is an implementation of interface inter
 */
public static boolean implementationOf(JavaClass clazz, JavaClass inter) {
  return clazz.implementationOf(inter);
}
 

public JavaClass dequeue()                {
  return (JavaClass)vec.removeFirst();
}
 

/**
 * This commutative operation returns the first common superclass (narrowest ReferenceType
 * referencing a class, not an interface).
 * If one of the types is a superclass of the other, the former is returned.
 * If "this" is Type.NULL, then t is returned.
 * If t is Type.NULL, then "this" is returned.
 * If "this" equals t ['this.equals(t)'] "this" is returned.
 * If "this" or t is an ArrayType, then Type.OBJECT is returned.
 * If "this" or t is a ReferenceType referencing an interface, then Type.OBJECT is returned.
 * If not all of the two classes' superclasses cannot be found, "null" is returned.
 * See the JVM specification edition 2, "4.9.2 The Bytecode Verifier".
 *
 * @deprecated use getFirstCommonSuperclass(ReferenceType t) which has
 *             slightly changed semantics.
 */
public ReferenceType firstCommonSuperclass(ReferenceType t) {
  if (this.equals(Type.NULL)) return t;
  if (t.equals(Type.NULL)) return this;
  if (this.equals(t)) return this;
  /*
   * TODO: Above sounds a little arbitrary. On the other hand, there is
   * no object referenced by Type.NULL so we can also say all the objects
   * referenced by Type.NULL were derived from java.lang.Object.
   * However, the Java Language's "instanceof" operator proves us wrong:
   * "null" is not referring to an instance of java.lang.Object :)
   */

  if ((this instanceof ArrayType) || (t instanceof ArrayType))
    return Type.OBJECT;
  // TODO: Is there a proof of OBJECT being the direct ancestor of every ArrayType?

  if (((this instanceof ObjectType) && ((ObjectType) this).referencesInterface()) ||
      ((t instanceof ObjectType) && ((ObjectType) t).referencesInterface()))
    return Type.OBJECT;
  // TODO: The above line is correct comparing to the vmspec2. But one could
  // make class file verification a bit stronger here by using the notion of
  // superinterfaces or even castability or assignment compatibility.


  // this and t are ObjectTypes, see above.
  ObjectType thiz = (ObjectType) this;
  ObjectType other = (ObjectType) t;
  JavaClass[] thiz_sups = Repository.getSuperClasses(thiz.getClassName());
  JavaClass[] other_sups = Repository.getSuperClasses(other.getClassName());

  if ((thiz_sups == null) || (other_sups == null)) {
    return null;
  }

  // Waaahh...
  JavaClass[] this_sups = new JavaClass[thiz_sups.length + 1];
  JavaClass[] t_sups = new JavaClass[other_sups.length + 1];
  System.arraycopy(thiz_sups, 0, this_sups, 1, thiz_sups.length);
  System.arraycopy(other_sups, 0, t_sups, 1, other_sups.length);
  this_sups[0] = Repository.lookupClass(thiz.getClassName());
  t_sups[0] = Repository.lookupClass(other.getClassName());

  for (int i = 0; i < t_sups.length; i++) {
    for (int j = 0; j < this_sups.length; j++) {
      if (this_sups[j].equals(t_sups[i])) return new ObjectType(this_sups[j].getClassName());
    }
  }

  // Huh? Did you ask for Type.OBJECT's superclass??
  return null;
}
 

/**
 * Add clazz to repository if there isn't an equally named class already in there.
 *
 * @return old entry in repository
 */
public static JavaClass addClass( final JavaClass clazz ) {
    final JavaClass old = repository.findClass(clazz.getClassName());
    repository.storeClass(clazz);
    return old;
}
 

public JavaClass[] toArray() {
  JavaClass[] classes = new JavaClass[vec.size()];
  vec.toArray(classes);
  return classes;
}
 

public JavaClass[] toArray() {
    final Collection<JavaClass> values = map.values();
    final JavaClass[] classes = new JavaClass[values.size()];
    values.toArray(classes);
    return classes;
}
 

public void push( final JavaClass clazz ) {
    stack.push(clazz);
}
 

public JavaClass dequeue()                {
  return (JavaClass)vec.removeFirst();
}
 

public JavaClass[] toArray() {
  Collection values = _map.values();
  JavaClass[] classes = new JavaClass[values.size()];
  values.toArray(classes);
  return classes;
}
 

/**
 * @return true, if clazz is an implementation of interface inter
 */
public static boolean implementationOf(String clazz, JavaClass inter) {
  return implementationOf(lookupClass(clazz), inter);
}
 

/**
 * Add clazz to repository if there isn't an equally named class already in there.
 *
 * @return old entry in repository
 */
public static JavaClass addClass(JavaClass clazz) {
  JavaClass old = _repository.findClass(clazz.getClassName());
  _repository.storeClass(clazz);
  return old;
}
 

public JavaClass[] toArray() {
  Collection values = _map.values();
  JavaClass[] classes = new JavaClass[values.size()];
  values.toArray(classes);
  return classes;
}
 

/**
 * Remove given class from repository.
 */
public static void removeClass(JavaClass clazz) {
  _repository.removeClass(clazz);
}