package com.alibaba.fastjson.parser.deserializer;
import java.lang.reflect.Constructor;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.DefaultJSONParser;
import com.alibaba.fastjson.parser.DefaultJSONParser.ResolveTask;
import com.alibaba.fastjson.parser.Feature;
import com.alibaba.fastjson.parser.JSONLexer;
import com.alibaba.fastjson.parser.JSONToken;
import com.alibaba.fastjson.parser.ParseContext;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.FilterUtils;
import com.alibaba.fastjson.util.DeserializeBeanInfo;
import com.alibaba.fastjson.util.FieldInfo;
import com.alibaba.fastjson.util.TypeUtils;
public class JavaBeanDeserializer implements ObjectDeserializer {
private final Map<String, FieldDeserializer> feildDeserializerMap = new IdentityHashMap<String, FieldDeserializer>();
private final List<FieldDeserializer> fieldDeserializers = new ArrayList<FieldDeserializer>();
private final Class<?> clazz;
private DeserializeBeanInfo beanInfo;
public JavaBeanDeserializer(ParserConfig config, Class<?> clazz){
this(config, clazz, clazz);
}
public JavaBeanDeserializer(ParserConfig config, Class<?> clazz, Type type){
this.clazz = clazz;
beanInfo = DeserializeBeanInfo.computeSetters(clazz, type);
for (FieldInfo fieldInfo : beanInfo.getFieldList()) {
addFieldDeserializer(config, clazz, fieldInfo);
}
}
public Map<String, FieldDeserializer> getFieldDeserializerMap() {
return feildDeserializerMap;
}
public Class<?> getClazz() {
return clazz;
}
private void addFieldDeserializer(ParserConfig mapping, Class<?> clazz, FieldInfo fieldInfo) {
FieldDeserializer fieldDeserializer = createFieldDeserializer(mapping, clazz, fieldInfo);
feildDeserializerMap.put(fieldInfo.getName().intern(), fieldDeserializer);
fieldDeserializers.add(fieldDeserializer);
}
public FieldDeserializer createFieldDeserializer(ParserConfig mapping, Class<?> clazz, FieldInfo fieldInfo) {
return mapping.createFieldDeserializer(mapping, clazz, fieldInfo);
}
public Object createInstance(DefaultJSONParser parser, Type type) {
if (type instanceof Class) {
if (clazz.isInterface()) {
Class<?> clazz = (Class<?>) type;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
final JSONObject obj = new JSONObject();
Object proxy = Proxy.newProxyInstance(loader, new Class<?>[] { clazz }, obj);
return proxy;
}
}
if (beanInfo.getDefaultConstructor() == null) {
return null;
}
Object object;
try {
Constructor<?> constructor = beanInfo.getDefaultConstructor();
if (constructor.getParameterTypes().length == 0) {
object = constructor.newInstance();
} else {
object = constructor.newInstance(parser.getContext().getObject());
}
} catch (Exception e) {
throw new JSONException("create instance error, class " + clazz.getName(), e);
}
if (parser.isEnabled(Feature.InitStringFieldAsEmpty)) {
for (FieldInfo fieldInfo : beanInfo.getFieldList()) {
if (fieldInfo.getFieldClass() == String.class) {
try {
fieldInfo.set(object, "");
} catch (Exception e) {
throw new JSONException("create instance error, class " + clazz.getName(), e);
}
}
}
}
return object;
}
public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
return deserialze(parser, type, fieldName, null);
}
@SuppressWarnings("unchecked")
public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName, Object object) {
JSONLexer lexer = parser.getLexer(); // xxx
if (lexer.token() == JSONToken.NULL) {
lexer.nextToken(JSONToken.COMMA);
return null;
}
ParseContext context = parser.getContext();
if (object != null) {
context = context.getParentContext();
}
ParseContext childContext = null;
try {
Map<String, Object> fieldValues = null;
if (lexer.token() == JSONToken.RBRACE) {
lexer.nextToken(JSONToken.COMMA);
if (object == null) {
object = createInstance(parser, type);
}
return (T) object;
}
if (lexer.token() != JSONToken.LBRACE && lexer.token() != JSONToken.COMMA) {
StringBuffer buf = (new StringBuffer()) //
.append("syntax error, expect {, actual ") //
.append(lexer.tokenName()) //
.append(", pos ") //
.append(lexer.pos()) //
;
if (fieldName instanceof String) {
buf //
.append(", fieldName ") //
.append(fieldName);
}
throw new JSONException(buf.toString());
}
if (parser.getResolveStatus() == DefaultJSONParser.TypeNameRedirect) {
parser.setResolveStatus(DefaultJSONParser.NONE);
}
for (;;) {
String key = lexer.scanSymbol(parser.getSymbolTable());
if (key == null) {
if (lexer.token() == JSONToken.RBRACE) {
lexer.nextToken(JSONToken.COMMA);
break;
}
if (lexer.token() == JSONToken.COMMA) {
if (parser.isEnabled(Feature.AllowArbitraryCommas)) {
continue;
}
}
}
if ("$ref" == key) {
lexer.nextTokenWithColon(JSONToken.LITERAL_STRING);
if (lexer.token() == JSONToken.LITERAL_STRING) {
String ref = lexer.stringVal();
if ("@".equals(ref)) {
object = context.getObject();
} else if ("..".equals(ref)) {
ParseContext parentContext = context.getParentContext();
if (parentContext.getObject() != null) {
object = parentContext.getObject();
} else {
parser.addResolveTask(new ResolveTask(parentContext, ref));
parser.setResolveStatus(DefaultJSONParser.NeedToResolve);
}
} else if ("$".equals(ref)) {
ParseContext rootContext = context;
while (rootContext.getParentContext() != null) {
rootContext = rootContext.getParentContext();
}
if (rootContext.getObject() != null) {
object = rootContext.getObject();
} else {
parser.addResolveTask(new ResolveTask(rootContext, ref));
parser.setResolveStatus(DefaultJSONParser.NeedToResolve);
}
} else {
parser.addResolveTask(new ResolveTask(context, ref));
parser.setResolveStatus(DefaultJSONParser.NeedToResolve);
}
} else {
throw new JSONException("illegal ref, " + JSONToken.name(lexer.token()));
}
lexer.nextToken(JSONToken.RBRACE);
if (lexer.token() != JSONToken.RBRACE) {
throw new JSONException("illegal ref");
}
lexer.nextToken(JSONToken.COMMA);
parser.setContext(context, object, fieldName);
return (T) object;
}
if (JSON.DEFAULT_TYPE_KEY == key) {
lexer.nextTokenWithColon(JSONToken.LITERAL_STRING);
if (lexer.token() == JSONToken.LITERAL_STRING) {
String typeName = lexer.stringVal();
lexer.nextToken(JSONToken.COMMA);
if (type instanceof Class && typeName.equals(((Class<?>) type).getName())) {
if (lexer.token() == JSONToken.RBRACE) {
lexer.nextToken();
break;
}
continue;
}
Class<?> userType = TypeUtils.loadClass(typeName);
ObjectDeserializer deserizer = parser.getConfig().getDeserializer(userType);
return (T) deserizer.deserialze(parser, userType, fieldName);
} else {
throw new JSONException("syntax error");
}
}
if (object == null && fieldValues == null) {
object = createInstance(parser, type);
if (object == null) {
fieldValues = new HashMap<String, Object>(this.fieldDeserializers.size());
}
childContext = parser.setContext(context, object, fieldName);
}
boolean match = parseField(parser, key, object, type, fieldValues);
if (!match) {
if (lexer.token() == JSONToken.RBRACE) {
lexer.nextToken();
break;
}
continue;
}
if (lexer.token() == JSONToken.COMMA) {
continue;
}
if (lexer.token() == JSONToken.RBRACE) {
lexer.nextToken(JSONToken.COMMA);
break;
}
if (lexer.token() == JSONToken.IDENTIFIER || lexer.token() == JSONToken.ERROR) {
throw new JSONException("syntax error, unexpect token " + JSONToken.name(lexer.token()));
}
}
if (object == null) {
if (fieldValues == null) {
object = createInstance(parser, type);
return (T) object;
}
List<FieldInfo> fieldInfoList = beanInfo.getFieldList();
int size = fieldInfoList.size();
Object[] params = new Object[size];
for (int i = 0; i < size; ++i) {
FieldInfo fieldInfo = fieldInfoList.get(i);
params[i] = fieldValues.get(fieldInfo.getName());
}
if (beanInfo.getCreatorConstructor() != null) {
try {
object = beanInfo.getCreatorConstructor().newInstance(params);
} catch (Exception e) {
throw new JSONException("create instance error, "
+ beanInfo.getCreatorConstructor().toGenericString(), e);
}
} else if (beanInfo.getFactoryMethod() != null) {
try {
object = beanInfo.getFactoryMethod().invoke(null, params);
} catch (Exception e) {
throw new JSONException("create factory method error, "
+ beanInfo.getFactoryMethod().toString(), e);
}
}
}
return (T) object;
} finally {
if (childContext != null) {
childContext.setObject(object);
}
parser.setContext(context);
}
}
public boolean parseField(DefaultJSONParser parser, String key, Object object, Type objectType,
Map<String, Object> fieldValues) {
JSONLexer lexer = parser.getLexer(); // xxx
FieldDeserializer fieldDeserializer = feildDeserializerMap.get(key);
if (fieldDeserializer == null) {
for (Map.Entry<String, FieldDeserializer> entry : feildDeserializerMap.entrySet()) {
if (entry.getKey().equalsIgnoreCase(key)) {
fieldDeserializer = entry.getValue();
break;
}
}
}
if (fieldDeserializer == null) {
parseExtra(parser, object, key);
return false;
}
lexer.nextTokenWithColon(fieldDeserializer.getFastMatchToken());
fieldDeserializer.parseField(parser, object, objectType, fieldValues);
return true;
}
void parseExtra(DefaultJSONParser parser, Object object, String key) {
final JSONLexer lexer = parser.getLexer(); // xxx
if (!lexer.isEnabled(Feature.IgnoreNotMatch)) {
throw new JSONException("setter not found, class " + clazz.getName() + ", property " + key);
}
lexer.nextTokenWithColon();
Type type = FilterUtils.getExtratype(parser, object, key);
Object value;
if (type == null) {
value = parser.parse(); // skip
} else {
value = parser.parseObject(type);
}
FilterUtils.processExtra(parser, object, key, value);
}
public int getFastMatchToken() {
return JSONToken.LBRACE;
}
}