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• PojoUtils.java

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org.apache.dubbo.common.utils.PojoUtils Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.dubbo.common.utils;

import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.IdentityHashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Properties;
import java.util.TreeMap;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.function.Consumer;
import java.util.function.Supplier;

import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;

import static org.apache.dubbo.common.utils.ClassUtils.isAssignableFrom;

/**
 * PojoUtils. Travel object deeply, and convert complex type to simple type.
 * 

 * Simple type below will be remained:
 * 

 * 
 Primitive Type, also include String, Number(Integer, Long), Date
 * 
 Array of Primitive Type
 * 
 Collection, eg: List, Map, Set etc.
 * 
 * 

 * Other type will be covert to a map which contains the attributes and value pair of object.
 */
public class PojoUtils {

    private static final Logger logger = LoggerFactory.getLogger(PojoUtils.class);
    private static final ConcurrentMap NAME_METHODS_CACHE = new ConcurrentHashMap();
    private static final ConcurrentMap, ConcurrentMap> CLASS_FIELD_CACHE = new ConcurrentHashMap, ConcurrentMap>();
    private static final boolean GENERIC_WITH_CLZ = Boolean.parseBoolean(ConfigUtils.getProperty(CommonConstants.GENERIC_WITH_CLZ_KEY, "true"));
    private static final List> CLASS_CAN_BE_STRING = Arrays.asList(Byte.class, Short.class, Integer.class,
            Long.class, Float.class, Double.class, Boolean.class, Character.class);

    public static Object[] generalize(Object[] objs) {
        Object[] dests = new Object[objs.length];
        for (int i = 0; i < objs.length; i++) {
            dests[i] = generalize(objs[i]);
        }
        return dests;
    }

    public static Object[] realize(Object[] objs, Class[] types) {
        if (objs.length != types.length) {
            throw new IllegalArgumentException("args.length != types.length");
        }

        Object[] dests = new Object[objs.length];
        for (int i = 0; i < objs.length; i++) {
            dests[i] = realize(objs[i], types[i]);
        }

        return dests;
    }

    public static Object[] realize(Object[] objs, Class[] types, Type[] gtypes) {
        if (objs.length != types.length || objs.length != gtypes.length) {
            throw new IllegalArgumentException("args.length != types.length");
        }
        Object[] dests = new Object[objs.length];
        for (int i = 0; i < objs.length; i++) {
            dests[i] = realize(objs[i], types[i], gtypes[i]);
        }
        return dests;
    }

    public static Object generalize(Object pojo) {
        return generalize(pojo, new IdentityHashMap());
    }

    @SuppressWarnings("unchecked")
    private static Object generalize(Object pojo, Map history) {
        if (pojo == null) {
            return null;
        }

        if (pojo instanceof Enum) {
            return ((Enum) pojo).name();
        }
        if (pojo.getClass().isArray() && Enum.class.isAssignableFrom(pojo.getClass().getComponentType())) {
            int len = Array.getLength(pojo);
            String[] values = new String[len];
            for (int i = 0; i < len; i++) {
                values[i] = ((Enum) Array.get(pojo, i)).name();
            }
            return values;
        }

        if (ReflectUtils.isPrimitives(pojo.getClass())) {
            return pojo;
        }
        
        if (pojo instanceof LocalDate || pojo instanceof LocalDateTime || pojo instanceof LocalTime) {
            return pojo.toString();
        }

        if (pojo instanceof Class) {
            return ((Class) pojo).getName();
        }

        Object o = history.get(pojo);
        if (o != null) {
            return o;
        }
        history.put(pojo, pojo);

        if (pojo.getClass().isArray()) {
            int len = Array.getLength(pojo);
            Object[] dest = new Object[len];
            history.put(pojo, dest);
            for (int i = 0; i < len; i++) {
                Object obj = Array.get(pojo, i);
                dest[i] = generalize(obj, history);
            }
            return dest;
        }
        if (pojo instanceof Collection) {
            Collection