com.feilong.lib.javassist.bytecode.annotation.MemberValue Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of feilong Show documentation

feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

There is a newer version: 4.3.0

Show newest version

/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 2004 Bill Burke. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package com.feilong.lib.javassist.bytecode.annotation;

import java.io.IOException;
import java.lang.reflect.Method;

import com.feilong.lib.javassist.ClassPool;
import com.feilong.lib.javassist.bytecode.ConstPool;
import com.feilong.lib.javassist.bytecode.Descriptor;

/**
 * The value of a member declared in an annotation.
 *
 * @see Annotation#getMemberValue(String)
 * @author Bill Burke
 * @author Shigeru Chiba
 */
public abstract class MemberValue{

    ConstPool cp;

    char      tag;

    MemberValue(char tag, ConstPool cp){
        this.cp = cp;
        this.tag = tag;
    }

    /**
     * Returns the value. If the value type is a primitive type, the
     * returned value is boxed.
     */
    abstract Object getValue(ClassLoader cl,ClassPool cp,Method m) throws ClassNotFoundException;

    abstract Class getType(ClassLoader cl) throws ClassNotFoundException;

    static Class loadClass(ClassLoader cl,String classname) throws ClassNotFoundException,NoSuchClassError{
        try{
            return Class.forName(convertFromArray(classname), true, cl);
        }catch (LinkageError e){
            throw new NoSuchClassError(classname, e);
        }
    }

    private static String convertFromArray(String classname){
        int index = classname.indexOf("[]");
        if (index != -1){
            String rawType = classname.substring(0, index);
            StringBuffer sb = new StringBuffer(Descriptor.of(rawType));
            while (index != -1){
                sb.insert(0, "[");
                index = classname.indexOf("[]", index + 1);
            }
            return sb.toString().replace('/', '.');
        }
        return classname;
    }

    /**
     * Accepts a visitor.
     */
    public abstract void accept(MemberValueVisitor visitor);

    /**
     * Writes the value.
     */
    public abstract void write(AnnotationsWriter w) throws IOException;
}