Java Code Examples for com.sun.org.apache.bcel.internal.Repository#lookupClass()

/**
 * 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());
  }
}
 

/**
 * 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();
}
 

/** Default _main method
 */
public static void _main(String[] argv) throws Exception {
  JavaClass java_class;
  String    name = argv[0];

  if((java_class = Repository.lookupClass(name)) == null)
    java_class = new ClassParser(name).parse(); // May throw IOException

  BCELifier bcelifier = new BCELifier(java_class, System.out);
  bcelifier.start();
}
 

/** Default _main method
 */
public static void _main(String[] argv) throws Exception {
  JavaClass java_class;
  String    name = argv[0];

  if((java_class = Repository.lookupClass(name)) == null)
    java_class = new ClassParser(name).parse(); // May throw IOException

  BCELifier bcelifier = new BCELifier(java_class, System.out);
  bcelifier.start();
}
 

/**
 * 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 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 an interface, it references a class
 * or a non-existant entity.
 * @deprecated (since 6.0) this method returns an inaccurate result
 *   if the class or interface referenced cannot
 *   be found: use referencesInterfaceExact() instead
 */
@Deprecated
public boolean referencesInterface() {
    try {
        final JavaClass jc = Repository.lookupClass(class_name);
        return !jc.isClass();
    } catch (final ClassNotFoundException e) {
        return false;
    }
}
 

/**
 * 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();
}
 

/** Default _main method
 */
public static void _main(String[] argv) throws Exception {
  JavaClass java_class;
  String    name = argv[0];

  if((java_class = Repository.lookupClass(name)) == null)
    java_class = new ClassParser(name).parse(); // May throw IOException

  BCELifier bcelifier = new BCELifier(java_class, System.out);
  bcelifier.start();
}
 

/** Default _main method
 */
public static void _main(String[] argv) throws Exception {
  JavaClass java_class;
  String    name = argv[0];

  if((java_class = Repository.lookupClass(name)) == null)
    java_class = new ClassParser(name).parse(); // May throw IOException

  BCELifier bcelifier = new BCELifier(java_class, System.out);
  bcelifier.start();
}
 

/**
 * 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 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();
}
 

/**
 * 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());
  }
}
 

/**
 * 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();
}
 

/**
 * 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());
  }
}
 

/**
 * 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;
}
 

/**
 * 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;
 * unless their dimensions match. Then an ArrayType of the same
 * number of dimensions is returned, with its basic type being the
 * first common super class of the basic types of "this" and t.
 * 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".
 */
public ReferenceType getFirstCommonSuperclass(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 :)
   */

  /* This code is from a bug report by Konstantin Shagin <[email protected]> */

  if ((this instanceof ArrayType) && (t instanceof ArrayType)) {
    ArrayType arrType1 = (ArrayType) this;
    ArrayType arrType2 = (ArrayType) t;
    if (
        (arrType1.getDimensions() == arrType2.getDimensions()) &&
        arrType1.getBasicType() instanceof ObjectType &&
        arrType2.getBasicType() instanceof ObjectType) {
      return new ArrayType(
                           ((ObjectType) arrType1.getBasicType()).getFirstCommonSuperclass((ObjectType) arrType2.getBasicType()),
                           arrType1.getDimensions()
                           );

    }
  }

  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;
}
 

/**
 * 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;
}
 

/**
 * Return true if this type references an interface,
 * false if it references a class.
 * @return true if the type references an interface, false if
 *   it references a class
 * @throws ClassNotFoundException if the class or interface
 *   referenced by this type can't be found
 */
public boolean referencesInterfaceExact() throws ClassNotFoundException {
    final JavaClass jc = Repository.lookupClass(class_name);
    return !jc.isClass();
}