package com.alibaba.fastjson.parser.deserializer;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import com.alibaba.fastjson.parser.DefaultJSONParser;
import com.alibaba.fastjson.parser.JSONLexer;
import com.alibaba.fastjson.parser.JSONToken;
import com.alibaba.fastjson.util.TypeUtils;
public class NumberDeserializer implements ObjectDeserializer {
public final static NumberDeserializer instance = new NumberDeserializer();
@SuppressWarnings("unchecked")
public <T> T deserialze(DefaultJSONParser parser, Type clazz, Object fieldName) {
final JSONLexer lexer = parser.getLexer();
if (lexer.token() == JSONToken.LITERAL_INT) {
if (clazz == double.class || clazz == Double.class) {
String val = lexer.numberString();
lexer.nextToken(JSONToken.COMMA);
return (T) Double.valueOf(Double.parseDouble(val));
}
long val = lexer.longValue();
lexer.nextToken(JSONToken.COMMA);
if (clazz == short.class || clazz == Short.class) {
return (T) Short.valueOf((short) val);
}
if (clazz == byte.class || clazz == Byte.class) {
return (T) Byte.valueOf((byte) val);
}
if (val >= Integer.MIN_VALUE && val <= Integer.MAX_VALUE) {
return (T) Integer.valueOf((int) val);
}
return (T) Long.valueOf(val);
}
if (lexer.token() == JSONToken.LITERAL_FLOAT) {
if (clazz == double.class || clazz == Double.class) {
String val = lexer.numberString();
lexer.nextToken(JSONToken.COMMA);
return (T) Double.valueOf(Double.parseDouble(val));
}
BigDecimal val = lexer.decimalValue();
lexer.nextToken(JSONToken.COMMA);
if (clazz == short.class || clazz == Short.class) {
return (T) Short.valueOf(val.shortValue());
}
if (clazz == byte.class || clazz == Byte.class) {
return (T) Byte.valueOf(val.byteValue());
}
return (T) val;
}
Object value = parser.parse();
if (value == null) {
return null;
}
if (clazz == double.class || clazz == Double.class) {
return (T) TypeUtils.castToDouble(value);
}
if (clazz == short.class || clazz == Short.class) {
return (T) TypeUtils.castToShort(value);
}
if (clazz == byte.class || clazz == Byte.class) {
return (T) TypeUtils.castToByte(value);
}
return (T) TypeUtils.castToBigDecimal(value);
}
public int getFastMatchToken() {
return JSONToken.LITERAL_INT;
}
}