Java Code Examples for javassist.bytecode.LocalVariableAttribute#variableName()

The following examples show how to use javassist.bytecode.LocalVariableAttribute#variableName() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: ReflectUtil.java From koper with Apache License 2.0

7 votes

/**
 * Get method arg names.
 *
 * @param clazz
 * @param methodName
 * @return
 */
public static <T> String[] getMethodArgNames(Class<T> clazz, String methodName) {
    try {
        ClassPool pool = ClassPool.getDefault();
        CtClass cc = pool.get(clazz.getName());

        CtMethod cm = cc.getDeclaredMethod(methodName);

        // 使用javaassist的反射方法获取方法的参数名
        MethodInfo methodInfo = cm.getMethodInfo();
        CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
        LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
        if (attr == null) {
            throw new RuntimeException("LocalVariableAttribute of method is null! Class " + clazz.getName() + ",method name is " + methodName);
        }
        String[] paramNames = new String[cm.getParameterTypes().length];
        int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;
        for (int i = 0; i < paramNames.length; i++)
            paramNames[i] = attr.variableName(i + pos);

        return paramNames;
    } catch (NotFoundException e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}

Example 2

Source File: ParamInfo.java From ModTheSpire with MIT License

6 votes

private static String findName(CtBehavior ctBehavior, int position)
{
    MethodInfo methodInfo = ctBehavior.getMethodInfo2();
    LocalVariableAttribute table = (LocalVariableAttribute) methodInfo.getCodeAttribute().getAttribute(LocalVariableAttribute.tag);
    if (table != null) {
        int j = 0;
        for (int i=0; i<table.tableLength(); ++i) {
            if (table.startPc(i) == 0) {
                if (j == 0 && !table.variableName(i).equals("this")) {
                    ++j; // Skip to position 1 if `this` doesn't exist (static method)
                }
                if (j == position) {
                    return table.variableName(i);
                }
                ++j;
            }
        }
    }
    return null;
}

Example 3

Source File: ReflectionUtils.java From cola-cloud with MIT License

6 votes

private static String[] getMethodParamNames(CtMethod ctMethod) throws RuntimeException {
    CtClass ctClass = ctMethod.getDeclaringClass();
    MethodInfo methodInfo = ctMethod.getMethodInfo();
    CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
    LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
    if (attr == null) {
        throw new RuntimeException(ctClass.getName());
    }
    try {
        String[] paramNames = new String[ctMethod.getParameterTypes().length];
        int pos = Modifier.isStatic(ctMethod.getModifiers()) ? 0 : 1;
        for (int i = 0; i < paramNames.length; i++) {
            paramNames[i] = attr.variableName(i + pos);
        }
        return paramNames;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

Example 4

Source File: ClassHelper.java From TakinRPC with Apache License 2.0

6 votes

/**
 * get method parameter names
 * @param cls
 * @param method
 * @return
 * @throws Exception
 */
public static String[] getParamNames(Class<?> cls, Method method) throws Exception {
    ClassPool pool = ClassPool.getDefault();
    CtClass cc = pool.get(cls.getName());

    Class<?>[] paramAry = method.getParameterTypes();
    String[] paramTypeNames = new String[paramAry.length];
    for (int i = 0; i < paramAry.length; i++) {
        paramTypeNames[i] = paramAry[i].getName();
    }

    CtMethod cm = cc.getDeclaredMethod(method.getName(), pool.get(paramTypeNames));

    MethodInfo methodInfo = cm.getMethodInfo();
    CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
    LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
    if (attr == null) {
        throw new Exception("class:" + cls.getName() + ", have no LocalVariableTable, please use javac -g:{vars} to compile the source file");
    }
    String[] paramNames = new String[cm.getParameterTypes().length];
    int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;
    for (int i = 0; i < paramNames.length; i++) {
        paramNames[i] = attr.variableName(i + pos);
    }
    return paramNames;
}

Example 5

Source File: BeanUtil.java From framework with Apache License 2.0

6 votes

/**
 * 获取方法参数名称
 * 
 * @param cm <br>
 * @return <br>
 * @throws NotFoundException <br>
 * @throws UtilException 如果最终编译的class文件不包含局部变量表信息 <br>
 */
protected static String[] getMethodParamNames(final CtMethod cm) throws NotFoundException, UtilException {
    CtClass cc = cm.getDeclaringClass();
    MethodInfo methodInfo = cm.getMethodInfo();
    CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
    if (codeAttribute == null) {
        throw new UtilException(ErrorCodeDef.CAN_NOT_FIND_VER_NAME_10003, cc.getName());
    }
    LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
    if (null == attr) {
        throw new UtilException(ErrorCodeDef.CAN_NOT_FIND_VER_NAME_10003, cc.getName());
    }
    String[] paramNames = new String[cm.getParameterTypes().length];
    int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;
    for (int i = 0; i < paramNames.length; i++) {
        paramNames[i] = attr.variableName(i + pos);
    }
    return paramNames;
}

Example 6

Source File: ClassUtil.java From common-project with Apache License 2.0

5 votes

/**
 * 基于javassist获取类方法参数名称
 * @param method
 * @return
 * @throws Exception
 */
public static String[] getMethodParamsName(Method method) throws Exception{
    Class<?> clazz = method.getDeclaringClass();
    ClassPool pool = ClassPool.getDefault();
    CtClass clz = pool.get(clazz.getName());
    CtClass[] params = new CtClass[method.getParameterTypes().length];
    for (int i = 0; i < method.getParameterTypes().length; i++) {
        params[i] = pool.getCtClass(method.getParameterTypes()[i].getName());
    }
    CtMethod cm = clz.getDeclaredMethod(method.getName(), params);
    MethodInfo methodInfo = cm.getMethodInfo();
    CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
    if (codeAttribute==null) {
        return null;
    }
    LocalVariableAttribute attr = (LocalVariableAttribute) codeAttribute
            .getAttribute(LocalVariableAttribute.tag);
    int pos = Modifier.isStatic(cm.getModifiers()) ? 0 : 1;
    String[] paramNames = new String[cm.getParameterTypes().length];
    if (attr==null) {
        return null;
    }
    for (int i = 0; i < paramNames.length; i++) {
        paramNames[i] = attr.variableName(i + pos);
    }
    return paramNames;
}