package com.jcdm.common.utils.reflect;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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import java.util.Date;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.lang3.Validate;
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import org.apache.poi.ss.usermodel.DateUtil;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import com.jcdm.common.core.text.Convert;
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import com.jcdm.common.utils.DateUtils;
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/**
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* 反射工具类. 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
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*
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* @author jc
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*/
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@SuppressWarnings("rawtypes")
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public class ReflectUtils
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{
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private static final String SETTER_PREFIX = "set";
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private static final String GETTER_PREFIX = "get";
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private static final String CGLIB_CLASS_SEPARATOR = "$$";
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private static Logger logger = LoggerFactory.getLogger(ReflectUtils.class);
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/**
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* 调用Getter方法.
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* 支持多级，如：对象名.对象名.方法
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*/
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@SuppressWarnings("unchecked")
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public static <E> E invokeGetter(Object obj, String propertyName)
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{
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Object object = obj;
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for (String name : StringUtils.split(propertyName, "."))
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{
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String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(name);
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object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
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}
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return (E) object;
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}
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/**
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* 调用Setter方法, 仅匹配方法名。
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* 支持多级，如：对象名.对象名.方法
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*/
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public static <E> void invokeSetter(Object obj, String propertyName, E value)
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{
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Object object = obj;
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String[] names = StringUtils.split(propertyName, ".");
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for (int i = 0; i < names.length; i++)
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{
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if (i < names.length - 1)
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{
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String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(names[i]);
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object = invokeMethod(object, getterMethodName, new Class[] {}, new Object[] {});
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}
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else
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{
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String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(names[i]);
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invokeMethodByName(object, setterMethodName, new Object[] { value });
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}
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}
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}
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/**
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* 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
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*/
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@SuppressWarnings("unchecked")
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public static <E> E getFieldValue(final Object obj, final String fieldName)
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{
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Field field = getAccessibleField(obj, fieldName);
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if (field == null)
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{
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logger.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + fieldName + "] 字段 ");
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return null;
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}
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E result = null;
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try
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{
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result = (E) field.get(obj);
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}
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catch (IllegalAccessException e)
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{
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logger.error("不可能抛出的异常{}", e.getMessage());
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}
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return result;
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}
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/**
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* 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
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*/
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public static <E> void setFieldValue(final Object obj, final String fieldName, final E value)
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{
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Field field = getAccessibleField(obj, fieldName);
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if (field == null)
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{
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// throw new IllegalArgumentException("在 [" + obj.getClass() + "] 中，没有找到 [" + fieldName + "] 字段 ");
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logger.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + fieldName + "] 字段 ");
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return;
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}
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try
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{
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field.set(obj, value);
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}
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catch (IllegalAccessException e)
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{
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logger.error("不可能抛出的异常: {}", e.getMessage());
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}
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}
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/**
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* 直接调用对象方法, 无视private/protected修饰符.
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* 用于一次性调用的情况，否则应使用getAccessibleMethod()函数获得Method后反复调用.
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* 同时匹配方法名+参数类型，
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*/
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@SuppressWarnings("unchecked")
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public static <E> E invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes,
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final Object[] args)
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{
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if (obj == null || methodName == null)
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{
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return null;
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}
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Method method = getAccessibleMethod(obj, methodName, parameterTypes);
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if (method == null)
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{
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logger.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + methodName + "] 方法 ");
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return null;
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}
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try
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{
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return (E) method.invoke(obj, args);
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}
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catch (Exception e)
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{
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String msg = "method: " + method + ", obj: " + obj + ", args: " + args + "";
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throw convertReflectionExceptionToUnchecked(msg, e);
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}
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}
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/**
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* 直接调用对象方法, 无视private/protected修饰符，
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* 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
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* 只匹配函数名，如果有多个同名函数调用第一个。
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*/
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@SuppressWarnings("unchecked")
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public static <E> E invokeMethodByName(final Object obj, final String methodName, final Object[] args)
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{
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Method method = getAccessibleMethodByName(obj, methodName, args.length);
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if (method == null)
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{
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// 如果为空不报错，直接返回空。
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logger.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + methodName + "] 方法 ");
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return null;
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}
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try
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{
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// 类型转换（将参数数据类型转换为目标方法参数类型）
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Class<?>[] cs = method.getParameterTypes();
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for (int i = 0; i < cs.length; i++)
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{
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if (args[i] != null && !args[i].getClass().equals(cs[i]))
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{
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if (cs[i] == String.class)
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{
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args[i] = Convert.toStr(args[i]);
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if (StringUtils.endsWith((String) args[i], ".0"))
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{
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args[i] = StringUtils.substringBefore((String) args[i], ".0");
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}
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}
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else if (cs[i] == Integer.class)
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{
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args[i] = Convert.toInt(args[i]);
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}
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else if (cs[i] == Long.class)
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{
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args[i] = Convert.toLong(args[i]);
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}
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else if (cs[i] == Double.class)
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{
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args[i] = Convert.toDouble(args[i]);
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}
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else if (cs[i] == Float.class)
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{
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args[i] = Convert.toFloat(args[i]);
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}
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else if (cs[i] == Date.class)
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{
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if (args[i] instanceof String)
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{
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args[i] = DateUtils.parseDate(args[i]);
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}
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else
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{
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args[i] = DateUtil.getJavaDate((Double) args[i]);
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}
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}
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else if (cs[i] == boolean.class || cs[i] == Boolean.class)
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{
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args[i] = Convert.toBool(args[i]);
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}
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}
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}
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return (E) method.invoke(obj, args);
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}
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catch (Exception e)
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{
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String msg = "method: " + method + ", obj: " + obj + ", args: " + args + "";
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throw convertReflectionExceptionToUnchecked(msg, e);
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}
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}
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/**
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* 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
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* 如向上转型到Object仍无法找到, 返回null.
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*/
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public static Field getAccessibleField(final Object obj, final String fieldName)
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{
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// 为空不报错。直接返回 null
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if (obj == null)
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{
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return null;
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}
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Validate.notBlank(fieldName, "fieldName can't be blank");
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for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass())
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{
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try
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{
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Field field = superClass.getDeclaredField(fieldName);
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makeAccessible(field);
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return field;
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}
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catch (NoSuchFieldException e)
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{
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continue;
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}
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}
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return null;
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}
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/**
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* 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
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* 如向上转型到Object仍无法找到, 返回null.
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* 匹配函数名+参数类型。
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* 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
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*/
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public static Method getAccessibleMethod(final Object obj, final String methodName,
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final Class<?>... parameterTypes)
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{
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// 为空不报错。直接返回 null
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if (obj == null)
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{
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return null;
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}
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Validate.notBlank(methodName, "methodName can't be blank");
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for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass())
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{
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try
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{
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Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
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makeAccessible(method);
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return method;
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}
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catch (NoSuchMethodException e)
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{
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continue;
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}
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}
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return null;
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}
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/**
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* 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
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* 如向上转型到Object仍无法找到, 返回null.
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* 只匹配函数名。
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* 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
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*/
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public static Method getAccessibleMethodByName(final Object obj, final String methodName, int argsNum)
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{
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// 为空不报错。直接返回 null
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if (obj == null)
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{
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return null;
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}
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Validate.notBlank(methodName, "methodName can't be blank");
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for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass())
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{
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Method[] methods = searchType.getDeclaredMethods();
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for (Method method : methods)
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{
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if (method.getName().equals(methodName) && method.getParameterTypes().length == argsNum)
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{
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makeAccessible(method);
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return method;
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}
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}
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}
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return null;
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}
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/**
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* 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
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*/
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public static void makeAccessible(Method method)
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{
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if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
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&& !method.isAccessible())
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{
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method.setAccessible(true);
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}
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}
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/**
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* 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
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*/
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public static void makeAccessible(Field field)
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{
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if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers())
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|| Modifier.isFinal(field.getModifiers())) && !field.isAccessible())
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{
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field.setAccessible(true);
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}
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}
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/**
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* 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处
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* 如无法找到, 返回Object.class.
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*/
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@SuppressWarnings("unchecked")
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public static <T> Class<T> getClassGenricType(final Class clazz)
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{
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return getClassGenricType(clazz, 0);
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}
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/**
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* 通过反射, 获得Class定义中声明的父类的泛型参数的类型.
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* 如无法找到, 返回Object.class.
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*/
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public static Class getClassGenricType(final Class clazz, final int index)
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{
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Type genType = clazz.getGenericSuperclass();
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if (!(genType instanceof ParameterizedType))
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{
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logger.debug(clazz.getSimpleName() + "'s superclass not ParameterizedType");
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return Object.class;
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}
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Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
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if (index >= params.length || index < 0)
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{
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logger.debug("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
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+ params.length);
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return Object.class;
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}
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if (!(params[index] instanceof Class))
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{
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logger.debug(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
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return Object.class;
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}
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return (Class) params[index];
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}
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public static Class<?> getUserClass(Object instance)
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{
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if (instance == null)
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{
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throw new RuntimeException("Instance must not be null");
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}
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Class clazz = instance.getClass();
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if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR))
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{
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Class<?> superClass = clazz.getSuperclass();
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if (superClass != null && !Object.class.equals(superClass))
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{
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return superClass;
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}
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}
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return clazz;
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}
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/**
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* 将反射时的checked exception转换为unchecked exception.
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*/
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public static RuntimeException convertReflectionExceptionToUnchecked(String msg, Exception e)
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{
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if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
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|| e instanceof NoSuchMethodException)
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{
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return new IllegalArgumentException(msg, e);
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}
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else if (e instanceof InvocationTargetException)
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{
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return new RuntimeException(msg, ((InvocationTargetException) e).getTargetException());
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}
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return new RuntimeException(msg, e);
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}
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}
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