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      1 /*
      2  * Javassist, a Java-bytecode translator toolkit.
      3  * Copyright (C) 2004 Bill Burke. All Rights Reserved.
      4  *
      5  * The contents of this file are subject to the Mozilla Public License Version
      6  * 1.1 (the "License"); you may not use this file except in compliance with
      7  * the License.  Alternatively, the contents of this file may be used under
      8  * the terms of the GNU Lesser General Public License Version 2.1 or later.
      9  *
     10  * Software distributed under the License is distributed on an "AS IS" basis,
     11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     12  * for the specific language governing rights and limitations under the
     13  * License.
     14  */
     15 
     16 package javassist.bytecode.annotation;
     17 
     18 import javassist.ClassPool;
     19 import javassist.bytecode.ConstPool;
     20 import javassist.bytecode.Descriptor;
     21 import java.io.IOException;
     22 import java.lang.reflect.Method;
     23 
     24 /**
     25  * Class value.
     26  *
     27  * @author <a href="mailto:bill (at) jboss.org">Bill Burke</a>
     28  * @author Shigeru Chiba
     29  */
     30 public class ClassMemberValue extends MemberValue {
     31     int valueIndex;
     32 
     33     /**
     34      * Constructs a class value.  The initial value is specified
     35      * by the constant pool entry at the given index.
     36      *
     37      * @param index the index of a CONSTANT_Utf8_info structure.
     38      */
     39     public ClassMemberValue(int index, ConstPool cp) {
     40         super('c', cp);
     41         this.valueIndex = index;
     42     }
     43 
     44     /**
     45      * Constructs a class value.
     46      *
     47      * @param className         the initial value.
     48      */
     49     public ClassMemberValue(String className, ConstPool cp) {
     50         super('c', cp);
     51         setValue(className);
     52     }
     53 
     54     /**
     55      * Constructs a class value.
     56      * The initial value is java.lang.Class.
     57      */
     58     public ClassMemberValue(ConstPool cp) {
     59         super('c', cp);
     60         setValue("java.lang.Class");
     61     }
     62 
     63     Object getValue(ClassLoader cl, ClassPool cp, Method m)
     64             throws ClassNotFoundException {
     65         final String classname = getValue();
     66         if (classname.equals("void"))
     67             return void.class;
     68         else if (classname.equals("int"))
     69             return int.class;
     70         else if (classname.equals("byte"))
     71             return byte.class;
     72         else if (classname.equals("long"))
     73             return long.class;
     74         else if (classname.equals("double"))
     75             return double.class;
     76         else if (classname.equals("float"))
     77             return float.class;
     78         else if (classname.equals("char"))
     79             return char.class;
     80         else if (classname.equals("short"))
     81             return short.class;
     82         else if (classname.equals("boolean"))
     83             return boolean.class;
     84         else
     85             return loadClass(cl, classname);
     86     }
     87 
     88     Class getType(ClassLoader cl) throws ClassNotFoundException {
     89         return loadClass(cl, "java.lang.Class");
     90     }
     91 
     92     /**
     93      * Obtains the value of the member.
     94      *
     95      * @return fully-qualified class name.
     96      */
     97     public String getValue() {
     98         String v = cp.getUtf8Info(valueIndex);
     99         return Descriptor.toClassName(v);
    100     }
    101 
    102     /**
    103      * Sets the value of the member.
    104      *
    105      * @param newClassName      fully-qualified class name.
    106      */
    107     public void setValue(String newClassName) {
    108         String setTo = Descriptor.of(newClassName);
    109         valueIndex = cp.addUtf8Info(setTo);
    110     }
    111 
    112     /**
    113      * Obtains the string representation of this object.
    114      */
    115     public String toString() {
    116         return "<" + getValue() + " class>";
    117     }
    118 
    119     /**
    120      * Writes the value.
    121      */
    122     public void write(AnnotationsWriter writer) throws IOException {
    123         writer.classInfoIndex(cp.getUtf8Info(valueIndex));
    124     }
    125 
    126     /**
    127      * Accepts a visitor.
    128      */
    129     public void accept(MemberValueVisitor visitor) {
    130         visitor.visitClassMemberValue(this);
    131     }
    132 }
    133