com.manydesigns.portofino.utils.ReflectUtil.java Source code

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/**
 * Copyright (c) 2013-2015 www.javahih.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.manydesigns.portofino.utils;

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;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.beanutils.converters.DateConverter;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <p>
 * Title:??
 */
public final class ReflectUtil {
    private static Logger logger = LoggerFactory.getLogger(ReflectUtil.class);

    /**
     * @param obj
     * @param cmpModifier
     * @return
     */
    private static String[] getFieldsName(Object obj, int cmpModifier) {
        String[] retValue;
        Class<?> objClass = obj.getClass();
        Field[] fields = objClass.getDeclaredFields();

        if (fields != null && !(fields.length < 1)) {
            int j = 0;

            for (int i = 0; i < fields.length; i++) {
                int modifier = fields[i].getModifiers();
                if (modifier == cmpModifier)
                    j++;
            }

            retValue = new String[j];

            j = 0;
            for (int i = 0; i < fields.length; i++) {
                int modifier = fields[i].getModifiers();
                if (modifier == cmpModifier) {
                    retValue[j] = fields[i].getName();
                    j++;
                }
            }

            return retValue;
        } else
            return null;
    }

    public static final String[] getPrivateFieldsName(Object obj) {
        return getFieldsName(obj, Modifier.PRIVATE);
    }

    public static final String[] getProtectedFieldsName(Object obj) {
        return getFieldsName(obj, Modifier.PROTECTED);
    }

    public static final String[] getPublicFieldsName(Object obj) {
        return getFieldsName(obj, Modifier.PUBLIC);
    }

    public static final String[] getAllFieldsName(Object obj) {
        String[] retValue;
        Class<?> objClass = obj.getClass();
        Field[] fields = objClass.getDeclaredFields();

        if (fields != null && !(fields.length < 1)) {

            retValue = new String[fields.length];

            for (int i = 0; i < fields.length; i++) {
                retValue[i] = fields[i].getName();
            }

            return retValue;
        } else
            return null;
    }

    private static String[] getMethodsName(Object obj, int cmpModifier, String prefix) {
        String[] retValue;
        Class<?> objClass = obj.getClass();
        Method[] methods = objClass.getDeclaredMethods();

        if (methods != null && !(methods.length < 1)) {
            int j = 0;

            for (int i = 0; i < methods.length; i++) {
                int modifier = methods[i].getModifiers();

                if (prefix != null && !prefix.equals("")) {
                    if (modifier == cmpModifier && methods[i].getName().startsWith(prefix))
                        j++;
                } else if (modifier == cmpModifier)
                    j++;
            }

            retValue = new String[j];

            j = 0;
            for (int i = 0; i < methods.length; i++) {
                int modifier = methods[i].getModifiers();
                if (prefix != null && !prefix.equals("")) {
                    if (modifier == cmpModifier && methods[i].getName().startsWith(prefix)) {
                        retValue[j] = methods[i].getName();
                        j++;
                    }
                } else if (modifier == cmpModifier) {
                    retValue[j] = methods[i].getName();
                    j++;
                }

            }

            return retValue;
        } else
            return null;
    }

    public static final String[] getPrivateMethodsName(Object obj) {
        return getMethodsName(obj, Modifier.PRIVATE, null);
    }

    public static final String[] getProtectedMethodsName(Object obj) {
        return getMethodsName(obj, Modifier.PROTECTED, null);
    }

    public static final String[] getPublicMethodsName(Object obj) {
        return getMethodsName(obj, Modifier.PUBLIC, null);
    }

    public static final String[] filterPublicMethodsName(Object obj, String prefix) {
        return getMethodsName(obj, Modifier.PUBLIC, prefix);
    }

    private static Method[] getMethods(Object obj, int cmpModifier, String prefix) {
        Method[] retMethod = null;

        Class<?> objClass = obj.getClass();
        Method[] methods = objClass.getDeclaredMethods();

        if (methods != null && !(methods.length < 1)) {

            int j = 0;

            for (int i = 0; i < methods.length; i++) {
                int modifier = methods[i].getModifiers();
                if (prefix != null && !prefix.equals("")) {
                    if (modifier == cmpModifier && methods[i].getName().startsWith(prefix))
                        j++;
                } else if (modifier == cmpModifier)
                    j++;
            }
            retMethod = new Method[j];

            j = 0;
            for (int i = 0; i < methods.length; i++) {
                int modifier = methods[i].getModifiers();
                if (prefix != null && !prefix.equals("")) {
                    if (modifier == cmpModifier && methods[i].getName().startsWith(prefix)) {
                        retMethod[j] = methods[i];
                        j++;
                    }
                } else if (modifier == cmpModifier)
                    retMethod[j] = methods[i];
            }

            return retMethod;
        } else
            return null;
    }

    public static final Method[] getPrivateMethods(Object obj, String prefix) {
        return getMethods(obj, Modifier.PRIVATE, prefix);
    }

    public static final Method[] getProtectedMethods(Object obj, String prefix) {
        return getMethods(obj, Modifier.PROTECTED, prefix);
    }

    public static final Method[] getPublicMethods(Object obj, String prefix) {
        return getMethods(obj, Modifier.PUBLIC, prefix);
    }

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

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

        makeAccessible(field);

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

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

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

        makeAccessible(field);

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

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

        method.setAccessible(true);

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

    /**
     * ?, ?DeclaredField. ?Object?, null.
     */
    protected static Field getDeclaredField(final Object object, final String fieldName) {
        // Assert.notNull(object, "object?");
        // Assert.hasText(fieldName, "fieldName");
        for (Class<?> superClass = object.getClass(); superClass != Object.class; superClass = superClass
                .getSuperclass()) {
            try {
                return superClass.getDeclaredField(fieldName);
            } catch (Exception e) {
            }
        }
        return null;
    }

    /**
     * Field?.
     */
    protected static void makeAccessible(final Field field) {
        if (!Modifier.isPublic(field.getModifiers())
                || !Modifier.isPublic(field.getDeclaringClass().getModifiers())) {
            field.setAccessible(true);
        }
    }

    /**
     * ?,?DeclaredMethod. ?Object?, null.
     */
    protected static Method getDeclaredMethod(Object object, String methodName, Class<?>[] parameterTypes) {
        // Assert.notNull(object, "object?");

        for (Class<?> superClass = object.getClass(); superClass != Object.class; superClass = superClass
                .getSuperclass()) {
            try {
                return superClass.getDeclaredMethod(methodName, parameterTypes);
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * ??,Class?. , Object.class. eg. public UserDao extends HibernateDao<User>
     * 
     * @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> getSuperClassGenricType(Class<?> clazz) {
        return (Class<T>) getSuperClassGenricType(clazz, 0);
    }

    /**
     * ??,Class?. , Object.class. public UserDao extends HibernateDao<User,Long>
     * 
     * @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<?> getSuperClassGenricType(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];
    }

    /**
     * ????(getter), ??List.
     * 
     * @param collection ???.
     * @param propertyName ??????.
     */
    public static List<Object> convertElementPropertyToList(final Collection<?> collection,
            final String propertyName) {
        List<Object> list = new ArrayList<Object>();

        try {
            for (Object obj : collection) {
                list.add(PropertyUtils.getProperty(obj, propertyName));
            }
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }

        return list;
    }

    /**
     * ????(getter), ??.
     * 
     * @param collection ???.
     * @param propertyName ??????.
     * @param separator .
     */
    public static String convertElementPropertyToString(final Collection<?> collection, final String propertyName,
            final String separator) {
        List<Object> list = convertElementPropertyToList(collection, propertyName);
        return StringUtils.join(list, separator);
    }

    /**
     * ?clazzproperty.
     * 
     * @param value ?
     * @param clazz ???Class
     * @param propertyName ???Class.
     */
    public static Object convertValue(Object value, Class<?> toType) {
        try {
            DateConverter dc = new DateConverter();
            dc.setUseLocaleFormat(true);
            dc.setPatterns(new String[] { "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss" });
            ConvertUtils.register(dc, Date.class);
            return ConvertUtils.convert(value, toType);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

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

    /**
     * 
     * 
     * @param obj
     * @param fieldName
     * @return
     * @author Xiaojf
     * @since 2011-9-9
     */
    public static Class<?> getGenericType(Class<?> obj, String fieldName) {
        try {
            Field field = getDeclaredField(obj, fieldName);
            if (field != null) {
                ParameterizedType pt = (ParameterizedType) field.getGenericType();
                if (pt != null && pt.getActualTypeArguments() != null) {
                    Type[] types = pt.getActualTypeArguments();
                    if (types.length > 0) {
                        return (Class<?>) types[0];
                    }
                }
            }
        } catch (Exception e) {
        }
        return null;
    }

    public static String getRootClassName(Class<?> clazz) {
        String name = clazz.getName();
        int index = name.lastIndexOf(".");
        return name.substring(index + 1);
    }
}