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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Copyright (C) 2008 feilong
*
* 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.feilong.lib.json;
import static com.feilong.core.Validator.isNullOrEmpty;
import static com.feilong.core.lang.ObjectUtil.defaultIfNull;
import static com.feilong.core.util.CollectionsUtil.newArrayList;
import static com.feilong.core.util.MapUtil.newHashMap;
import static com.feilong.lib.json.util.PropertySetStrategy.setProperty;
import static java.util.Collections.emptyMap;
import java.beans.PropertyDescriptor;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.beanutils.DynaBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.feilong.core.bean.PropertyUtil;
import com.feilong.lib.json.processors.PropertyNameProcessor;
import com.feilong.lib.json.processors.PropertyNameProcessorMatcher;
import com.feilong.lib.json.util.ClassResolver;
import com.feilong.lib.json.util.JSONUtils;
import com.feilong.lib.json.util.KeyUpdater;
import com.feilong.lib.json.util.PropertyFilter;
import com.feilong.lib.lang3.tuple.Triple;
/**
* JSONObject 转成 Bean的工具类.
*
* @author feilong
* @since 3.0.0
*/
public class JSONObjectToBeanUtil{
/** The Constant LOGGER. */
private static final Logger LOGGER = LoggerFactory.getLogger(JSONObjectToBeanUtil.class);
/** Don't let anyone instantiate this class. */
private JSONObjectToBeanUtil(){
//AssertionError不是必须的. 但它可以避免不小心在类的内部调用构造器. 保证该类在任何情况下都不会被实例化.
//see 《Effective Java》 2nd
throw new AssertionError("No " + getClass().getName() + " instances for you!");
}
//---------------------------------------------------------------
/**
* Creates a bean from a JSONObject, with the specific configuration.
*
* @param jsonObject
* the json object
* @param jsonConfig
* the json config
* @return the object
*/
public static Object toBean(JSONObject jsonObject,JsonConfig jsonConfig){
if (jsonObject == null || jsonObject.isNullObject()){
return null;
}
//---------------------------------------------------------------
Class rootClass = jsonConfig.getRootClass();
Object rootBean = BeanNewer.newBean(rootClass);
//---------------------------------------------------------------
//所有经过filter 以及加工key 之后的数据
//Triple.of(name, key, value)
List> list = buildTripleList(rootBean, jsonObject, jsonConfig);
if (isNullOrEmpty(list)){
return rootBean;
}
//---------------------------------------------------------------
Map> jsonKeyAndClassMap = JSONUtils.getKeyAndTypeMap(jsonObject);
if (!Map.class.isAssignableFrom(rootClass)){
return doWithBean(rootBean, rootClass, list, jsonKeyAndClassMap, jsonConfig);
}
return doMap(rootBean, list, jsonKeyAndClassMap, jsonConfig);
}
private static Object doWithBean(
Object rootBean,
Class rootClass,
List> list,
Map> jsonKeyAndClassMap,
JsonConfig jsonConfig){
//Triple.of(name, key, value)
Map, PropertyDescriptor> map = build(rootClass, list);
if (isNullOrEmpty(map)){
return rootBean;
}
//---------------------------------------------------------------
for (Map.Entry, PropertyDescriptor> entry : map.entrySet()){
Triple triple = entry.getKey();
String key = triple.getMiddle();
PropertyDescriptor propertyDescriptor = entry.getValue();
if (propertyDescriptor.getWriteMethod() == null){
LOGGER.debug("{} property '{}' has no write method. SKIPPED.", rootClass.getCanonicalName(), key);
continue;
}
String name = triple.getLeft();
Class jsonValueType = jsonKeyAndClassMap.get(name);
try{
toBeanUsePropertyDescriptor(rootBean, triple, jsonValueType, jsonConfig, propertyDescriptor);
}catch (Exception e){
throw new JSONException("Error while setting property=[" + name + "] type: " + jsonValueType, e);
}
}
return rootBean;
}
private static Object doMap(
Object rootBean,
List> list,
Map> jsonKeyAndClassMap,
JsonConfig jsonConfig){
for (Triple triple : list){
String name = triple.getLeft();
String key = triple.getMiddle();
Object value = triple.getRight();
//---------------------------------------------------------------
Class jsonValueType = jsonKeyAndClassMap.get(name);
toBeanDoWithMap(rootBean, name, jsonValueType, value, key, jsonConfig);
}
return rootBean;
}
/**
* 查找json 以及 属性的对应关系
*/
private static Map, PropertyDescriptor> build(
Class rootClass,
List> list){
PropertyDescriptor[] propertyDescriptors = PropertyUtil.getPropertyDescriptors(rootClass);
if (isNullOrEmpty(propertyDescriptors)){
return emptyMap();
}
//---------------------------------------------------------------
Map, PropertyDescriptor> map = newHashMap();
for (PropertyDescriptor propertyDescriptor : propertyDescriptors){
String propertyName = propertyDescriptor.getName();
//Triple.of(name, key, value)
for (Triple triple : list){
String key = triple.getMiddle();
if (key.equals(propertyName)){
map.put(triple, propertyDescriptor);
break;
}
}
}
return map;
}
private static void toBeanUsePropertyDescriptor(
Object bean,
Triple triple,
Class jsonValueType,
JsonConfig jsonConfig,
PropertyDescriptor propertyDescriptor){
String key = triple.getMiddle();
Object value = triple.getRight();
if (JSONUtils.isNull(value)){
setNull(bean, jsonValueType, key);
return;
}
Class beanPropertyType = propertyDescriptor.getPropertyType();
//---------------------------------------------------------------
if (isCommonType(jsonValueType)){
if (beanPropertyType.isInstance(value)){
setProperty(bean, key, value);
return;
}
setProperty(bean, key, PropertyValueMorpher.morph(key, value, jsonValueType, beanPropertyType));
return;
}
Map> configClassMap = defaultIfNull(jsonConfig.getClassMap(), emptyMap());
String name = triple.getLeft();
//---------------------------------------------------------------
if (value instanceof JSONArray){
if (List.class.isAssignableFrom(beanPropertyType) || Set.class.isAssignableFrom(beanPropertyType)){
setProperty(
bean,
key,
PropertyValueConvertUtil.toCollection(key, value, jsonConfig, name, configClassMap, beanPropertyType));
}else{
setProperty(bean, key, PropertyValueConvertUtil.toArray(key, value, beanPropertyType, jsonConfig, configClassMap));
}
return;
}
//---------------------------------------------------------------
JsonConfig jsonConfigCopy = jsonConfig.copy();
jsonConfigCopy.setRootClass(ClassResolver.resolve(key, name, configClassMap, beanPropertyType));
jsonConfigCopy.setClassMap(configClassMap);
setProperty(bean, key, toBean((JSONObject) value, jsonConfigCopy));
return;
}
/**
* 设置 null.
*
* @param bean
* the bean
* @param type
* the type
* @param key
* the key
*/
private static void setNull(Object bean,Class type,String key){
if (type.isPrimitive()){
// assume assigned default value
LOGGER.warn("Tried to assign null value to {}:{}", key, type.getName());
setProperty(bean, key, JSONUtils.getMorpherRegistry().morph(type, null));
}else{
setProperty(bean, key, null);
}
}
private static void toBeanDoWithMap(Object bean,String name,Class type,Object value,String key,JsonConfig jsonConfig){
Map> configClassMap = defaultIfNull(jsonConfig.getClassMap(), emptyMap());
// no type info available for conversion
if (JSONUtils.isNull(value)){
setProperty(bean, key, value);
return;
}
//---------------------------------------------------------------
if (value instanceof JSONArray){
setProperty(bean, key, PropertyValueConvertUtil.toCollection(key, value, jsonConfig, name, configClassMap, List.class));
return;
}
if (isCommonType(type)){
setProperty(bean, key, value);
return;
}
//---------------------------------------------------------------
Class targetClass = ClassResolver.resolve(key, name, type, configClassMap);
JsonConfig jsonConfigCopy = jsonConfig.copy();
jsonConfigCopy.setRootClass(targetClass);
jsonConfigCopy.setClassMap(configClassMap);
if (targetClass != null){
setProperty(bean, key, toBean((JSONObject) value, jsonConfigCopy));
}else{
setProperty(bean, key, toDynaBean((JSONObject) value));
}
}
/**
* Creates a JSONDynaBean from a JSONObject.
*
* @param jsonObject
* the json object
* @return the object
*/
@Deprecated
private static DynaBean toDynaBean(JSONObject jsonObject){
JsonConfig jsonConfig = new JsonConfig();
Map> props = JSONUtils.getKeyAndTypeMap(jsonObject);
DynaBean dynaBean = JSONUtils.newDynaBean(jsonObject, jsonConfig);
List names = jsonObject.names(jsonConfig);
for (String name : names){
String key = jsonConfig.getJavaIdentifierTransformer().transformToJavaIdentifier(name);
Class type = props.get(name);
Object value = jsonObject.get(name);
try{
if (!JSONUtils.isNull(value)){
if (value instanceof JSONArray){
dynaBean.set(key, JSONArrayToBeanUtil.toCollection((JSONArray) value));
}else if (String.class.isAssignableFrom(type) || //
Boolean.class.isAssignableFrom(type) || //
JSONUtils.isNumber(type) || //
Character.class.isAssignableFrom(type)){
dynaBean.set(key, value);
}else{
dynaBean.set(key, toDynaBean((JSONObject) value));
}
}else{
if (type.isPrimitive()){
// assume assigned default value
LOGGER.warn("Tried to assign null value to {}:{}", key, type.getName());
dynaBean.set(key, JSONUtils.getMorpherRegistry().morph(type, null));
}else{
dynaBean.set(key, null);
}
}
}catch (Exception e){
throw new JSONException("Error while setting property=" + name + " type" + type, e);
}
}
return dynaBean;
}
//Triple.of(name, key, value)
private static List> buildTripleList(Object rootBean,JSONObject jsonObject,JsonConfig jsonConfig){
List names = jsonObject.names(jsonConfig);
Class rootClass = jsonConfig.getRootClass();
PropertyFilter javaPropertyFilter = jsonConfig.getJavaPropertyFilter();
PropertyNameProcessor propertyNameProcessor = findJavaPropertyNameProcessor(rootClass, jsonConfig);
List> list = newArrayList();
for (String name : names){
Object value = jsonObject.get(name);
if (javaPropertyFilter != null && javaPropertyFilter.apply(rootBean, name, value)){
continue;
}
//---------------------------------------------------------------
String key = jsonConfig.getJavaIdentifierTransformer().transformToJavaIdentifier(name);
key = KeyUpdater.update(rootClass, key, propertyNameProcessor);
list.add(Triple.of(name, key, value));
}
return list;
}
private static boolean isCommonType(Class type){
return String.class.isAssignableFrom(type) || //
JSONUtils.isBoolean(type) || //
JSONUtils.isNumber(type) || //
JSONUtils.isString(type);
}
/**
* Finds a PropertyNameProcessor registered to the target class.
* Returns null if none is registered.
* [JSON -> Java]
*
* @param beanClass
* the bean class
* @param jsonConfig
* @return the property name processor
*/
private static PropertyNameProcessor findJavaPropertyNameProcessor(Class beanClass,JsonConfig jsonConfig){
Map, PropertyNameProcessor> javaPropertyNameProcessorMap = jsonConfig.getJavaPropertyNameProcessorMap();
return javaPropertyNameProcessorMap.isEmpty() ? null
: javaPropertyNameProcessorMap
.get(PropertyNameProcessorMatcher.getMatch(beanClass, javaPropertyNameProcessorMap.keySet()));
}
}