com.rapid.develop.core.utils.ReflectionUtils.java Source code

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/*
 * Copyright (c) 2015-2020, Chen Rui
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rapid.develop.core.utils;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * Reflection Utils Tools.
 *
 */
public class ReflectionUtils {

    private static final String SETTER_PREFIX = "set";

    private static final String GETTER_PREFIX = "get";

    private static final String CGLIB_CLASS_SEPARATOR = "$$";

    private static Logger logger = LoggerFactory.getLogger(ReflectionUtils.class);

    /**
     * Getter.
     */
    public static Object invokeGetter(Object obj, String propertyName) {
        String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(propertyName);
        return invokeMethod(obj, getterMethodName, new Class[] {}, new Object[] {});
    }

    /**
     * Setter, ???.
     */
    public static void invokeSetter(Object obj, String propertyName, Object value) {
        String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(propertyName);
        invokeMethodByName(obj, setterMethodName, new Object[] { value });
    }

    /**
     * ?, private/protected, ??getter.
     */
    public static Object getFieldValue(final Object obj, final String fieldName) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find fields [" + fieldName + "] on target [" + obj + "]");
        }

        Object result = null;
        try {
            result = field.get(obj);
        } catch (IllegalAccessException e) {
            logger.error("??{}", e.getMessage());
        }
        return result;
    }

    /**
     * , private/protected, ??setter.
     */
    public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find fields [" + fieldName + "] on target [" + obj + "]");
        }

        try {
            field.set(obj, value);
        } catch (IllegalAccessException e) {
            logger.error("??:{}", e.getMessage());
        }
    }

    /**
     * , private/protected.
     * ?getAccessibleMethod()Method????.
     * ????+?
     */
    public static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes,
            final Object[] args) {
        Method method = getAccessibleMethod(obj, methodName, parameterTypes);
        if (method == null) {
            throw new IllegalArgumentException(
                    "Could not find MethodDefine [" + methodName + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * , private/protected
     * ?getAccessibleMethodByName()Method????.
     * ???????
     */
    public static Object invokeMethodByName(final Object obj, final String methodName, final Object[] args) {
        Method method = getAccessibleMethodByName(obj, methodName);
        if (method == null) {
            throw new IllegalArgumentException(
                    "Could not find MethodDefine [" + methodName + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * ?, ?DeclaredField, ?.
     *
     * <p>?Object?, null.</p>
     */
    public static Field getAccessibleField(final Object obj, final String fieldName) {
        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
                .getSuperclass()) {
            try {
                Field field = superClass.getDeclaredField(fieldName);
                makeAccessible(field);
                return field;
            } catch (NoSuchFieldException e) {
                // Field??,?
            }
        }
        return null;
    }

    /**
     * ?, ?DeclaredMethod,?.
     * ?Object?, null.
     * ???+?
     *
     * <p>?. ?Method,?Method.invoke(Object obj, Object... args)</p>
     */
    public static Method getAccessibleMethod(final Object obj, final String methodName,
            final Class<?>... parameterTypes) {
        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType
                .getSuperclass()) {
            try {
                Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
                makeAccessible(method);
                return method;
            } catch (NoSuchMethodException e) {
                // Method??,?
            }
        }
        return null;
    }

    /**
     * ?, ?DeclaredMethod,?.
     * ?Object?, null.
     * ????
     *
     * <p>?. ?Method,?Method.invoke(Object obj, Object... args)</p>
     */
    public static Method getAccessibleMethodByName(final Object obj, final String methodName) {
        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType
                .getSuperclass()) {
            Method[] methods = searchType.getDeclaredMethods();
            for (Method method : methods) {
                if (method.getName().equals(methodName)) {
                    makeAccessible(method);
                    return method;
                }
            }
        }
        return null;
    }

    /**
     * ?private/protectedpublic?????JDKSecurityManager.
     */
    public static void makeAccessible(Method method) {
        if ((!Modifier.isPublic(method.getModifiers())
                || !Modifier.isPublic(method.getDeclaringClass().getModifiers())) && !method.isAccessible()) {
            method.setAccessible(true);
        }
    }

    /**
     * ?private/protected???public?????JDKSecurityManager.
     */
    public static void makeAccessible(Field field) {
        if ((!Modifier.isPublic(field.getModifiers())
                || !Modifier.isPublic(field.getDeclaringClass().getModifiers())
                || Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {
            field.setAccessible(true);
        }
    }

    /**
     * ??, Class?, ?
     * , Object.class.
     * eg.
     * public UserDao extends HibernateDao&lt;User&gt;
     *
     * @param clazz The class to introspect
     * @return the first generic declaration, or Object.class if cannot be determined
     */
    @SuppressWarnings("unchecked")
    public static <T> Class<T> getClassGenricType(final Class clazz) {
        return getClassGenricType(clazz, 0);
    }

    /**
     * ??, Class?.
     * , Object.class.
     *
     * <p>public UserDao extends HibernateDao&lt;User,Long&gt;</p>
     *
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     * @return the index generic declaration, or Object.class if cannot be determined
     */
    public static Class getClassGenricType(final Class clazz, final int index) {

        Type genType = clazz.getGenericSuperclass();

        if (!(genType instanceof ParameterizedType)) {
            logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
            return Object.class;
        }

        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

        if ((index >= params.length) || (index < 0)) {
            logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
                    + params.length);
            return Object.class;
        }
        if (!(params[index] instanceof Class)) {
            logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
            return Object.class;
        }

        return (Class) params[index];
    }

    /**
     * ?.
     *
     * @param instance 
     * @return 
     */
    public static Class<?> getSuperClass(Object instance) {
        Class clazz = instance.getClass();
        if ((clazz != null) && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
            Class<?> superClass = clazz.getSuperclass();
            if ((superClass != null) && !Object.class.equals(superClass)) {
                return superClass;
            }
        }
        return clazz;

    }

    /**
     * ??checked exception?unchecked exception.
     *
     * @param exception checked exception
     * @return unchecked exception
     */
    public static RuntimeException convertReflectionExceptionToUnchecked(Exception exception) {
        if ((exception instanceof IllegalAccessException) || (exception instanceof IllegalArgumentException)
                || (exception instanceof NoSuchMethodException)) {
            return new IllegalArgumentException(exception);
        } else if (exception instanceof InvocationTargetException) {
            return new RuntimeException(((InvocationTargetException) exception).getTargetException());
        } else if (exception instanceof RuntimeException) {
            return (RuntimeException) exception;
        }
        return new RuntimeException("Unexpected Checked Exception.", exception);
    }

    /**
     * ??,Class?.
     * public BookManager extends GenricManager&lt;Book&gt;
     *
     * @param clazz The class to introspect
     * @return the first generic declaration, or <code>Object.class</code> if cannot be determined
     */
    public static Class getSuperClassGenricType(Class clazz) {
        return getSuperClassGenricType(clazz, 0);
    }

    /**
     * ??,Class?.
     * public BookManager extends GenricManager&lt;Book&gt;
     *
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     */
    public static Class getSuperClassGenricType(Class clazz, int index) throws IndexOutOfBoundsException {
        return getGenericType(clazz.getGenericSuperclass(), index);
    }

    /**
     * ??.
     *
     * @param genType 
     * @param index ??
     * @return ?
     */
    public static Class getGenericType(Type genType, int index) {
        if (!(genType instanceof ParameterizedType)) {
            while (!Object.class.equals(genType) && !(genType instanceof ParameterizedType)) {
                genType = ((Class) genType).getGenericSuperclass();
            }

            if (Object.class.equals(genType)) {
                return Object.class;
            }
        }

        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

        if (index >= params.length || index < 0) {
            //log.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: " + params.length);
            return Object.class;
        }
        if (!(params[index] instanceof Class)) {
            //log.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
            return Object.class;
        }
        return (Class) params[index];
    }
}