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    1   package org.apache.bcel.generic;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56  import org.apache.bcel.Constants;
    57  import org.apache.bcel.Repository;
    58  import org.apache.bcel.classfile.JavaClass;
    59
    60  /***
    61   * Denotes reference such as java.lang.String.
    62   *
    63   * @version $Id: ObjectType.java,v 1.1.1.1 2001/10/29 20:00:25 jvanzyl Exp $
    64   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    65   */
    66  public final class ObjectType extends ReferenceType {
    67    private String class_name; // Class name of type
    68
    69    /***
    70     * @param class_name fully qualified class name, e.g. java.lang.String
    71     */
    72    public ObjectType(String class_name) {
    73      super(Constants.T_REFERENCE, "L" + class_name.replace('.', '/') + ";");
    74      this.class_name = class_name.replace('/', '.');
    75    }
    76
    77    /*** @return name of referenced class
    78     */
    79    public String getClassName() { return class_name; }
    80
    81    /*** @return a hash code value for the object.
    82     */
    83    public int hashCode()  { return class_name.hashCode(); }
    84
    85    /*** @return true if both type objects refer to the same class.
    86     */
    87    public boolean equals(Object type) {
    88      return (type instanceof ObjectType)?
    89        ((ObjectType)type).class_name.equals(class_name) : false;
    90    }
    91
    92    /***
    93     * If "this" doesn't reference a class, it references an interface
    94     * or a non-existant entity.
    95     */
    96    public boolean referencesClass(){
    97      JavaClass jc = Repository.lookupClass(class_name);
    98      if (jc == null)
    99        return false;
    100     else
    101       return jc.isClass();
    102   }
    103
    104   /***
    105    * If "this" doesn't reference an interface, it references a class
    106    * or a non-existant entity.
    107    */
    108   public boolean referencesInterface(){
    109     JavaClass jc = Repository.lookupClass(class_name);
    110     if (jc == null)
    111       return false;
    112     else
    113       return !jc.isClass();
    114   }
    115
    116   public boolean subclassOf(ObjectType superclass){
    117     if (this.referencesInterface() || superclass.referencesInterface())
    118       return false;
    119
    120     return Repository.instanceOf(this.class_name, superclass.class_name);
    121   }
    122
    123   /***
    124    * Java Virtual Machine Specification edition 2, § 5.4.4 Access Control
    125    */
    126   public boolean accessibleTo(ObjectType accessor) {
    127     JavaClass jc = Repository.lookupClass(class_name);
    128
    129     if(jc.isPublic()) {
    130       return true;
    131     } else {
    132       JavaClass acc = Repository.lookupClass(accessor.class_name);
    133       return acc.getPackageName().equals(jc.getPackageName());
    134     }
    135   }
    136 }

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