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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.lib.json.ToStringUtil.ARRAY_END;
import static com.feilong.lib.json.ToStringUtil.ARRAY_START;
import static com.feilong.lib.json.ToStringUtil.OBJECT_END;
import static com.feilong.lib.json.ToStringUtil.OBJECT_START;
import java.lang.annotation.Annotation;
import com.feilong.lib.json.processors.JsonValueProcessor;
import com.feilong.lib.json.processors.JsonVerifier;
import com.feilong.lib.json.util.JSONUtils;
/**
* 值的处理工具类.
*
* @author feilong
* @since 3.0.0
*/
public class ProcessValueUtil{
/** Don't let anyone instantiate this class. */
private ProcessValueUtil(){
//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!");
}
//---------------------------------------------------------------
/**
* Process value.
*
* @param value
* the value
* @param jsonConfig
* the json config
* @return the object
*/
static Object processArrayValue(Object value,JsonConfig jsonConfig){
if (value != null){
//Finds a JsonValueProcessor registered to the target type.
//Returns null if none is registered.
//[Java -> JSON]
JsonValueProcessor jsonValueProcessor = jsonConfig.getTypeMap().get(value.getClass());
if (jsonValueProcessor != null){
value = jsonValueProcessor.processArrayValue(value, jsonConfig);
if (!JsonVerifier.isValidJsonValue(value)){
throw new JSONException("Value is not a valid JSON value. " + value);
}
}
}
//---------------------------------------------------------------
if (value instanceof JSONTokener){
return JSONTokenerParser.toJSONArray((JSONTokener) value, jsonConfig);
}
if (value != null && Enum.class.isAssignableFrom(value.getClass())){
return ((Enum) value).name();
}
if (value instanceof Annotation || (value != null && value.getClass().isAnnotation())){
throw new JSONException("Unsupported type");
}
return process(value, jsonConfig);
}
//---------------------------------------------------------------
/**
* Process value.
*
* @param key
* the key
* @param value
* the value
* @param jsonConfig
* the json config
* @return the object
*/
static Object processJsonObjectValue(String key,Object value,JsonConfig jsonConfig){
if (value != null){
JsonValueProcessor jsonValueProcessor = jsonConfig.findJsonValueProcessor(value.getClass(), key);
if (jsonValueProcessor != null){
value = jsonValueProcessor.processObjectValue(null, value, jsonConfig);
if (!JsonVerifier.isValidJsonValue(value)){
throw new JSONException("Value is not a valid JSON value. " + value);
}
}
}
if (value instanceof JSONTokener){
return JSONTokenerParser.toJSONObject((JSONTokener) value, jsonConfig);
}
if (value != null && Enum.class.isAssignableFrom(value.getClass())){
return ((Enum) value).name();
}
return process(value, jsonConfig);
}
//---------------------------------------------------------------
/**
* Process value.
*
* @param value
* the value
* @param jsonConfig
* the json config
* @return the object
*/
private static Object process(Object value,JsonConfig jsonConfig){
if (JSONNull.getInstance().equals(value)){
return JSONNull.getInstance();
}
if (Class.class.isAssignableFrom(value.getClass()) || value instanceof Class){
return ((Class) value).getName();
}
//---------------------------------------------------------------
if (value instanceof JSON){
return JSONSerializer.toJSON(value, jsonConfig);
}
if (JSONUtils.isArray(value)){
return JSONArrayBuilder.build(value, jsonConfig);
}
//---------------------------------------------------------------
if (JSONUtils.isString(value)){
String str = String.valueOf(value);
if (JSONUtils.hasQuotes(str)){
String stripped = JSONUtils.stripQuotes(str);
if (stripped.startsWith(OBJECT_START) && stripped.endsWith(OBJECT_END)){
return stripped;
}
if (stripped.startsWith(ARRAY_START) && stripped.endsWith(ARRAY_END)){
return stripped;
}
return str;
}
//---------------------------------------------------------------
if (JSONUtils.isJsonKeyword(str)){
return str;
}
if (JSONUtils.mayBeJSON(str)){
try{
return JSONSerializer.toJSON(str, jsonConfig);
}catch (JSONException jsone){
return str;
}
}
return str;
}
//---------------------------------------------------------------
if (JSONUtils.isNumber(value)){
JSONUtils.testValidity(value);
return JSONUtils.transformNumber((Number) value);
}
if (JSONUtils.isBoolean(value)){
return value;
}
return JSONObjectBuilder.build(value, jsonConfig);
}
}