/**
* Copyright (c) 2011-2017, James Zhan 詹波 (jfinal@126.com).
*
* 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.jfinal.json;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.jfinal.kit.StrKit;
import com.jfinal.plugin.activerecord.Model;
import com.jfinal.plugin.activerecord.Record;
/**
* Json 转换 JFinal 实现.
*
* json 到 java 类型转换规则:
* string java.lang.String
* number java.lang.Number
* true|false java.lang.Boolean
* null null
* array java.util.List
* object java.util.Map
*/
@SuppressWarnings({"rawtypes", "unchecked"})
public class JFinalJson extends Json {
private static int defaultConvertDepth = 15;
protected int convertDepth = defaultConvertDepth;
protected String timestampPattern = "yyyy-MM-dd HH:mm:ss";
protected String datePattern = "yyyy-MM-dd";
/**
* 设置全局性默认转换深度
*/
public static void setDefaultConvertDepth(int defaultConvertDepth) {
if (defaultConvertDepth < 2) {
throw new IllegalArgumentException("defaultConvertDepth depth can not less than 2.");
}
JFinalJson.defaultConvertDepth = defaultConvertDepth;
}
public JFinalJson setConvertDepth(int convertDepth) {
if (convertDepth < 2) {
throw new IllegalArgumentException("convert depth can not less than 2.");
}
this.convertDepth = convertDepth;
return this;
}
public JFinalJson setTimestampPattern(String timestampPattern) {
if (StrKit.isBlank(timestampPattern)) {
throw new IllegalArgumentException("timestampPattern can not be blank.");
}
this.timestampPattern = timestampPattern;
return this;
}
public Json setDatePattern(String datePattern) {
if (StrKit.isBlank(datePattern)) {
throw new IllegalArgumentException("datePattern can not be blank.");
}
this.datePattern = datePattern;
return this;
}
public static JFinalJson getJson() {
return new JFinalJson();
}
protected String mapToJson(Map map, int depth) {
if(map == null) {
return "null";
}
StringBuilder sb = new StringBuilder();
boolean first = true;
Iterator iter = map.entrySet().iterator();
sb.append('{');
while(iter.hasNext()){
if(first)
first = false;
else
sb.append(',');
Map.Entry entry = (Map.Entry)iter.next();
toKeyValue(String.valueOf(entry.getKey()),entry.getValue(), sb, depth);
}
sb.append('}');
return sb.toString();
}
protected String toKeyValue(String key, Object value, StringBuilder sb, int depth){
sb.append('\"');
if(key == null)
sb.append("null");
else
escape(key, sb);
sb.append('\"').append(':');
sb.append(toJson(value, depth));
return sb.toString();
}
protected String iteratorToJson(Iterator iter, int depth) {
boolean first = true;
StringBuilder sb = new StringBuilder();
sb.append('[');
while(iter.hasNext()){
if(first)
first = false;
else
sb.append(',');
Object value = iter.next();
if(value == null){
sb.append("null");
continue;
}
sb.append(toJson(value, depth));
}
sb.append(']');
return sb.toString();
}
/**
* Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters (U+0000 through U+001F).
*/
protected String escape(String s) {
if(s == null)
return null;
StringBuilder sb = new StringBuilder();
escape(s, sb);
return sb.toString();
}
protected void escape(String s, StringBuilder sb) {
for(int i=0; i<s.length(); i++){
char ch = s.charAt(i);
switch(ch){
case '"':
sb.append("\\\"");
break;
case '\\':
sb.append("\\\\");
break;
case '\b':
sb.append("\\b");
break;
case '\f':
sb.append("\\f");
break;
case '\n':
sb.append("\\n");
break;
case '\r':
sb.append("\\r");
break;
case '\t':
sb.append("\\t");
break;
//case '/':
// sb.append("\\/");
// break;
default:
if((ch >= '\u0000' && ch <= '\u001F') || (ch >= '\u007F' && ch <= '\u009F') || (ch >= '\u2000' && ch <= '\u20FF')) {
String str = Integer.toHexString(ch);
sb.append("\\u");
for(int k=0; k<4-str.length(); k++) {
sb.append('0');
}
sb.append(str.toUpperCase());
}
else{
sb.append(ch);
}
}
}
}
public String toJson(Object object) {
return toJson(object, convertDepth);
}
protected String toJson(Object value, int depth) {
if(value == null || (depth--) < 0)
return "null";
if(value instanceof String)
return "\"" + escape((String)value) + "\"";
if(value instanceof Double){
if(((Double)value).isInfinite() || ((Double)value).isNaN())
return "null";
else
return value.toString();
}
if(value instanceof Float){
if(((Float)value).isInfinite() || ((Float)value).isNaN())
return "null";
else
return value.toString();
}
if(value instanceof Number)
return value.toString();
if(value instanceof Boolean)
return value.toString();
if (value instanceof java.util.Date) {
if (value instanceof java.sql.Timestamp) {
return "\"" + new SimpleDateFormat(timestampPattern).format(value) + "\"";
}
if (value instanceof java.sql.Time) {
return "\"" + value.toString() + "\"";
}
// 优先使用对象级的属性 datePattern, 然后才是全局性的 defaultDatePattern
String dp = datePattern != null ? datePattern : getDefaultDatePattern();
if (dp != null) {
return "\"" + new SimpleDateFormat(dp).format(value) + "\"";
} else {
return "" + ((java.util.Date)value).getTime();
}
}
if(value instanceof Collection) {
return iteratorToJson(((Collection)value).iterator(), depth);
}
if(value instanceof Map) {
return mapToJson((Map)value, depth);
}
String result = otherToJson(value, depth);
if (result != null)
return result;
// 类型无法处理时当作字符串处理,否则ajax调用返回时js无法解析
// return value.toString();
return "\"" + escape(value.toString()) + "\"";
}
protected String otherToJson(Object value, int depth) {
if (value instanceof Character) {
return "\"" + escape(value.toString()) + "\"";
}
if (value instanceof Model) {
Map map = com.jfinal.plugin.activerecord.CPI.getAttrs((Model)value);
return mapToJson(map, depth);
}
if (value instanceof Record) {
Map map = ((Record)value).getColumns();
return mapToJson(map, depth);
}
if (value.getClass().isArray()) {
int len = Array.getLength(value);
List<Object> list = new ArrayList<Object>(len);
for (int i=0; i<len; i++) {
list.add(Array.get(value, i));
}
return iteratorToJson(list.iterator(), depth);
}
if (value instanceof Iterator) {
return iteratorToJson((Iterator)value, depth);
}
if (value instanceof Enumeration) {
ArrayList<?> list = Collections.list((Enumeration<?>)value);
return iteratorToJson(list.iterator(), depth);
}
if (value instanceof Enum) {
return "\"" + ((Enum)value).toString() + "\"";
}
return beanToJson(value, depth);
}
protected String beanToJson(Object model, int depth) {
Map map = new HashMap();
Method[] methods = model.getClass().getMethods();
for (Method m : methods) {
String methodName = m.getName();
int indexOfGet = methodName.indexOf("get");
if (indexOfGet == 0 && methodName.length() > 3) { // Only getter
String attrName = methodName.substring(3);
if (!attrName.equals("Class")) { // Ignore Object.getClass()
Class<?>[] types = m.getParameterTypes();
if (types.length == 0) {
try {
Object value = m.invoke(model);
map.put(StrKit.firstCharToLowerCase(attrName), value);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
}
}
else {
int indexOfIs = methodName.indexOf("is");
if (indexOfIs == 0 && methodName.length() > 2) {
String attrName = methodName.substring(2);
Class<?>[] types = m.getParameterTypes();
if (types.length == 0) {
try {
Object value = m.invoke(model);
map.put(StrKit.firstCharToLowerCase(attrName), value);
} catch (Exception e) {
throw new RuntimeException(e.getMessage(), e);
}
}
}
}
}
return mapToJson(map, depth);
}
public <T> T parse(String jsonString, Class<T> type) {
throw new RuntimeException("jfinal " + com.jfinal.core.Const.JFINAL_VERSION +
"默认 json 实现暂不支持 json 到 object 的转换,建议使用 active recrord 的 Generator 生成 base model，" +
"再通过 me.setJsonFactory(new JacksonFactory()) 来支持");
}
}