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net_io.utils.JSONUtils Maven / Gradle / Ivy
package net_io.utils;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import net_io.utils.Mixed.ENTITY_TYPE;
public class JSONUtils {
public final static String ANONYMOUS_NODE = "__ANONYMOUS_NODE__";
public final static String EMPTY_NAME_NODE = "__EMPTY_NAME_NODE__";
protected static final char[][] CHARS_ESCAPE = {
{'\b', 'b'},
{'\n', 'n'},
{'\t', 't'},
{'\f', 'f'},
{'\r', 'r'},
{'\"', '\"'},
{'\\', '\\'},
};
private final static int SPACE_CHAR = 32;
private final static String INDENT = " ";
public static String escape(String str) {
int len = str.length();
StringBuffer sb = new StringBuffer();
for(int i=0; i= CHARS_ESCAPE.length) {
sb.append(ch);
}
}
return sb.toString();
}
public static String unescape(String str) {
int len = str.length();
StringBuffer sb = new StringBuffer();
for(int i=0; i= len) {
//TODO: Exception
break; //忽略最后一个 \\u
}
sb.append((char)Integer.parseInt(str.substring(i+1, i+5), 16));
i += 4;
} else { //转义字符
int j = 0;
for(; j= CHARS_ESCAPE.length) {
sb.append(ch); //转义字符表查不到，直接保存原文
}
}
} else {
sb.append(ch);
}
}
return sb.toString();
}
private byte[] data = null;
private int offset = 0;
private JSONUtils(byte[] data) {
this.data = data;
this.offset = 0;
}
public static Document toDOM(Mixed result) throws ParserConfigurationException {
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.newDocument();
Element rootElement = doc.createElement("ROOT");
doc.appendChild(rootElement);
processOneNode(doc, result, rootElement);
return doc;
}
private static void processOneNode(Document doc, Mixed result, Element element) {
Mixed.ENTITY_TYPE type = result.type();
if(type == Mixed.ENTITY_TYPE.LIST) {
for(int i=0; i SPACE_CHAR) {
break;
}
}
}
private Mixed parseStart() throws JSONException {
Mixed ret = null;
filterEmptyChar(); //忽略全部空白字符
if(offset >= data.length) {
return null;
}
switch(data[offset]) {
case '{':
ret = parseObject();
break;
case '[':
ret = parseArray();
break;
case '"':
ret = parseString();
break;
default:
ret = parsePrimitive();
}
return ret;
}
private Mixed parseObject() throws JSONException {
@SuppressWarnings("rawtypes")
Mixed map = new Mixed(new HashMap());
String key = null;
offset++; //跳过({)
while(offset < data.length) {
filterEmptyChar(); //过滤空白字符
//对象结束符“}”检查
if(offset >= data.length || data[offset] == '}') {
offset++;
return map;
}
//解析KEY
key = parseKey().toString();
filterEmptyChar(); //过滤空白字符
//解析Value
if(offset >= data.length || data[offset] != ':') {
throw new JSONException("Miss the (:).");
}
offset++; //跳过(:)
Object ret = parseStart();
//保存结果
map.set(key, ret);
filterEmptyChar(); //忽略全部空白字符
//下一元素处理
if(data[offset] == ',') {
offset++;
continue;
}
break;
}
offset++; //跳过(})
return map;
}
private Mixed parseArray() throws JSONException {
@SuppressWarnings("rawtypes")
Mixed list = new Mixed(new ArrayList());
offset++; //跳过([)
while(offset < data.length) {
filterEmptyChar(); //忽略全部空白字符
//数组结束符“]”检查
if(offset >= data.length || data[offset] == ']') {
offset++; //跳过(])
return list;
}
Object ret = parseStart();
//保存结果
list.add(ret);
filterEmptyChar(); //忽略全部空白字符
//下一元素处理
if(data[offset] == ',') {
offset++;
continue;
}
break;
}
offset++; //跳过(])
return list;
}
private Mixed parseKey() throws JSONException {
//存在单引号或双引号作为定界符，则按正常的字符串解析
if(data[offset] == '"' || data[offset] == '\'') {
return parseString();
}
int start = offset;
try {
while(offset < data.length) {
if(data[offset] <= SPACE_CHAR || data[offset] == ':') {
String str = new String(data, start, offset-start, "UTF-8");
str = unescape(str);
//要求：offset最后停留（:）
while(offset < data.length && data[offset] != ':') {
offset++;
}
return new Mixed(str);
}
if(data[offset] == '\\') {
offset += 2;
} else {
offset++;
}
}
} catch (UnsupportedEncodingException e) {
throw new JSONException("UnsupportedEncoding - "+e.getMessage());
}
throw new JSONException("Format error. not found (\").");
}
private Mixed parseString() throws JSONException {
if(data[offset] != '"' && data[offset] != '\'') {
throw new JSONException("String data type must start with (\" or ').");
}
byte limitChar = data[offset];
offset++; //跳过第1个(")
int start = offset;
try {
while(offset < data.length) {
if(data[offset] == limitChar) {
String str = new String(data, start, offset-start, "UTF-8");
str = unescape(str);
offset++; //跳过第2个(")
return new Mixed(str);
}
if(data[offset] == '\\') {
offset += 2;
} else {
offset++;
}
}
} catch (UnsupportedEncodingException e) {
throw new JSONException("UnsupportedEncoding - "+e.getMessage());
}
throw new JSONException("Format error. not found ("+(limitChar=='"'?'"':'\'')+").");
}
private Mixed parsePrimitive() throws JSONException {
filterEmptyChar(); //忽略全部空白字符
int start = offset;
for(; offset
