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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. 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;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.Map;

/**
 * EnclosingMethod_attribute.
 */
public class EnclosingMethodAttribute extends AttributeInfo{

    /**
     * The name of this attribute "EnclosingMethod".
     */
    public static final String tag = "EnclosingMethod";

    EnclosingMethodAttribute(ConstPool cp, int n, DataInputStream in) throws IOException{
        super(cp, n, in);
    }

    /**
     * Constructs an EnclosingMethod attribute.
     *
     * @param cp
     *            a constant pool table.
     * @param className
     *            the name of the innermost enclosing class.
     * @param methodName
     *            the name of the enclosing method.
     * @param methodDesc
     *            the descriptor of the enclosing method.
     */
    public EnclosingMethodAttribute(ConstPool cp, String className, String methodName, String methodDesc){
        super(cp, tag);
        int ci = cp.addClassInfo(className);
        int ni = cp.addNameAndTypeInfo(methodName, methodDesc);
        byte[] bvalue = new byte[4];
        bvalue[0] = (byte) (ci >>> 8);
        bvalue[1] = (byte) ci;
        bvalue[2] = (byte) (ni >>> 8);
        bvalue[3] = (byte) ni;
        set(bvalue);
    }

    /**
     * Constructs an EnclosingMethod attribute.
     * The value of method_index is set to 0.
     *
     * @param cp
     *            a constant pool table.
     * @param className
     *            the name of the innermost enclosing class.
     */
    public EnclosingMethodAttribute(ConstPool cp, String className){
        super(cp, tag);
        int ci = cp.addClassInfo(className);
        int ni = 0;
        byte[] bvalue = new byte[4];
        bvalue[0] = (byte) (ci >>> 8);
        bvalue[1] = (byte) ci;
        bvalue[2] = (byte) (ni >>> 8);
        bvalue[3] = (byte) ni;
        set(bvalue);
    }

    /**
     * Returns the value of class_index.
     */
    public int classIndex(){
        return ByteArray.readU16bit(get(), 0);
    }

    /**
     * Returns the value of method_index.
     */
    public int methodIndex(){
        return ByteArray.readU16bit(get(), 2);
    }

    /**
     * Returns the name of the class specified by class_index.
     */
    public String className(){
        return getConstPool().getClassInfo(classIndex());
    }

    /**
     * Returns the method name specified by method_index.
     * If the method is a class initializer (static constructor),
     * {@link MethodInfo#nameClinit} is returned.
     */
    public String methodName(){
        ConstPool cp = getConstPool();
        int mi = methodIndex();
        if (mi == 0){
            return MethodInfo.nameClinit;
        }
        int ni = cp.getNameAndTypeName(mi);
        return cp.getUtf8Info(ni);
    }

    /**
     * Returns the method descriptor specified by method_index.
     */
    public String methodDescriptor(){
        ConstPool cp = getConstPool();
        int mi = methodIndex();
        int ti = cp.getNameAndTypeDescriptor(mi);
        return cp.getUtf8Info(ti);
    }

    /**
     * Makes a copy. Class names are replaced according to the
     * given Map object.
     *
     * @param newCp
     *            the constant pool table used by the new copy.
     * @param classnames
     *            pairs of replaced and substituted
     *            class names.
     */
    @Override
    public AttributeInfo copy(ConstPool newCp,Map classnames){
        if (methodIndex() == 0){
            return new EnclosingMethodAttribute(newCp, className());
        }
        return new EnclosingMethodAttribute(newCp, className(), methodName(), methodDescriptor());
    }
}