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

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/*
 * 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.Array;
import java.lang.reflect.Method;

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

/**
 * Array member.
 *
 * @author Bill Burke
 * @author Shigeru Chiba
 */
public class ArrayMemberValue extends MemberValue{

    MemberValue   type;

    MemberValue[] values;

    /**
     * Constructs an array. The initial value or type are not specified.
     */
    public ArrayMemberValue(ConstPool cp){
        super('[', cp);
        type = null;
        values = null;
    }

    /**
     * Constructs an array. The initial value is not specified.
     *
     * @param t
     *            the type of the array elements.
     */
    public ArrayMemberValue(MemberValue t, ConstPool cp){
        super('[', cp);
        type = t;
        values = null;
    }

    @Override
    Object getValue(ClassLoader cl,ClassPool cp,Method method) throws ClassNotFoundException{
        if (values == null){
            throw new ClassNotFoundException("no array elements found: " + method.getName());
        }

        int size = values.length;
        Class clazz;
        if (type == null){
            clazz = method.getReturnType().getComponentType();
            if (clazz == null || size > 0){
                throw new ClassNotFoundException("broken array type: " + method.getName());
            }
        }else{
            clazz = type.getType(cl);
        }

        Object a = Array.newInstance(clazz, size);
        for (int i = 0; i < size; i++){
            Array.set(a, i, values[i].getValue(cl, cp, method));
        }

        return a;
    }

    @Override
    Class getType(ClassLoader cl) throws ClassNotFoundException{
        if (type == null){
            throw new ClassNotFoundException("no array type specified");
        }

        Object a = Array.newInstance(type.getType(cl), 0);
        return a.getClass();
    }

    /**
     * Obtains the type of the elements.
     *
     * @return null if the type is not specified.
     */
    public MemberValue getType(){
        return type;
    }

    /**
     * Obtains the elements of the array.
     */
    public MemberValue[] getValue(){
        return values;
    }

    /**
     * Sets the elements of the array.
     */
    public void setValue(MemberValue[] elements){
        values = elements;
        if (elements != null && elements.length > 0){
            type = elements[0];
        }
    }

    /**
     * Obtains the string representation of this object.
     */
    @Override
    public String toString(){
        StringBuffer buf = new StringBuffer("{");
        if (values != null){
            for (int i = 0; i < values.length; i++){
                buf.append(values[i].toString());
                if (i + 1 < values.length){
                    buf.append(", ");
                }
            }
        }

        buf.append("}");
        return buf.toString();
    }

    /**
     * Writes the value.
     */
    @Override
    public void write(AnnotationsWriter writer) throws IOException{
        int num = values == null ? 0 : values.length;
        writer.arrayValue(num);
        for (int i = 0; i < num; ++i){
            values[i].write(writer);
        }
    }

    /**
     * Accepts a visitor.
     */
    @Override
    public void accept(MemberValueVisitor visitor){
        visitor.visitArrayMemberValue(this);
    }
}