/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

package com.sun.org.apache.bcel.internal.generic;

/* ====================================================================

 * The Apache Software License, Version 1.1

 *

 * Copyright (c) 2001 The Apache Software Foundation.  All rights

 * reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. The end-user documentation included with the redistribution,

 *    if any, must include the following acknowledgment:

 *       "This product includes software developed by the

 *        Apache Software Foundation (http://www.apache.org/)."

 *    Alternately, this acknowledgment may appear in the software itself,

 *    if and wherever such third-party acknowledgments normally appear.

 *

 * 4. The names "Apache" and "Apache Software Foundation" and

 *    "Apache BCEL" must not be used to endorse or promote products

 *    derived from this software without prior written permission. For

 *    written permission, please contact apache@apache.org.

 *

 * 5. Products derived from this software may not be called "Apache",

 *    "Apache BCEL", nor may "Apache" appear in their name, without

 *    prior written permission of the Apache Software Foundation.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT

 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * ====================================================================

 *

 * This software consists of voluntary contributions made by many

 * individuals on behalf of the Apache Software Foundation.  For more

 * information on the Apache Software Foundation, please see

 * <http://www.apache.org/>.

 */

import com.sun.org.apache.bcel.internal.Constants;

import com.sun.org.apache.bcel.internal.Repository;

import com.sun.org.apache.bcel.internal.classfile.JavaClass;

/**

 * Denotes reference such as java.lang.String.

 *

 * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>

 */

public final class ObjectType extends ReferenceType {

  private String class_name; // Class name of type

  /**

   * @param class_name fully qualified class name, e.g. java.lang.String

   */

  public ObjectType(String class_name) {

    super(Constants.T_REFERENCE, "L" + class_name.replace('.', '/') + ";");

    this.class_name = class_name.replace('/', '.');

  }

  /** @return name of referenced class

   */

  public String getClassName() { return class_name; }

  /** @return a hash code value for the object.

   */

  public int hashCode()  { return class_name.hashCode(); }

  /** @return true if both type objects refer to the same class.

   */

  public boolean equals(Object type) {

    return (type instanceof ObjectType)?

      ((ObjectType)type).class_name.equals(class_name) : 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();

  }

  /**

   * 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();

  }

  public boolean subclassOf(ObjectType superclass){

    if (this.referencesInterface() || superclass.referencesInterface())

      return false;

    return Repository.instanceOf(this.class_name, superclass.class_name);

  }

  /**

   * 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());

    }

  }

}