Examples with CodeAttribute javassist.bytecode.CodeAttribute used on opensource projects

Example 6 with CodeAttribute

use of javassist.bytecode.CodeAttribute in project yyl_example by Relucent.

the class GetMethodParamNameTest method getMethodParamNames.

/**
	 * 获得参数名 (JDK 自带类 ，接口方法和抽象方法无法正确获取参数名)
	 */
private static String[] getMethodParamNames(final Method method) throws NotFoundException {
    final String methodName = method.getName();
    final Class<?>[] methodParameterTypes = method.getParameterTypes();
    final int methodParameterCount = methodParameterTypes.length;
    final String className = method.getDeclaringClass().getName();
    final boolean isStatic = Modifier.isStatic(method.getModifiers());
    final String[] methodParametersNames = new String[methodParameterCount];
    ClassPool pool = ClassPool.getDefault();
    CtClass ctClass = pool.get(className);
    CtClass[] ctTypes = new CtClass[methodParameterTypes.length];
    for (int i = 0; i < methodParameterCount; i++) {
        ctTypes[i] = pool.get(methodParameterTypes[i].getName());
    }
    CtMethod ctMethod = ctClass.getDeclaredMethod(methodName, ctTypes);
    MethodInfo methodInfo = ctMethod.getMethodInfo();
    CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
    LocalVariableAttribute attribute = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
    //如果是静态方法，第一个参数就是方法参数，非静态方法，则第一个参数是 this ,然后才是方法的参数
    if (attribute != null) {
        int variableCount = isStatic ? methodParameterCount : methodParameterCount + 1;
        for (int index = 0; index < variableCount; index++) {
            int methodParameterIndex = isStatic ? index : index - 1;
            if (0 <= methodParameterIndex && methodParameterIndex < methodParameterCount) {
                methodParametersNames[methodParameterIndex] = attribute.variableName(index);
            }
        }
    }
    return methodParametersNames;
}