package com.github.ltsopensource.core.json;
import com.github.ltsopensource.core.commons.utils.Base64;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.Map;
/**
* from fastjson
* @author Robert HG (254963746@qq.com) on 11/21/15.
*/
public class TypeUtils {
public static final String castToString(Object value) {
if (value == null) {
return null;
}
return value.toString();
}
public static final Byte castToByte(Object value) {
if (value == null) {
return null;
}
if (value instanceof Number) {
return ((Number) value).byteValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.length() == 0) {
return null;
}
return Byte.parseByte(strVal);
}
throw new JSONException("can not cast to byte, value : " + value);
}
public static final Short castToShort(Object value) {
if (value == null) {
return null;
}
if (value instanceof Number) {
return ((Number) value).shortValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.length() == 0) {
return null;
}
return Short.parseShort(strVal);
}
throw new JSONException("can not cast to short, value : " + value);
}
public static final BigDecimal castToBigDecimal(Object value) {
if (value == null) {
return null;
}
if (value instanceof BigDecimal) {
return (BigDecimal) value;
}
if (value instanceof BigInteger) {
return new BigDecimal((BigInteger) value);
}
String strVal = value.toString();
if (strVal.length() == 0) {
return null;
}
return new BigDecimal(strVal);
}
public static final BigInteger castToBigInteger(Object value) {
if (value == null) {
return null;
}
if (value instanceof BigInteger) {
return (BigInteger) value;
}
if (value instanceof Float || value instanceof Double) {
return BigInteger.valueOf(((Number) value).longValue());
}
String strVal = value.toString();
if (strVal.length() == 0) {
return null;
}
return new BigInteger(strVal);
}
public static final Float castToFloat(Object value) {
if (value == null) {
return null;
}
if (value instanceof Number) {
return ((Number) value).floatValue();
}
if (value instanceof String) {
String strVal = value.toString();
if (strVal.length() == 0) {
return null;
}
return Float.parseFloat(strVal);
}
throw new JSONException("can not cast to float, value : " + value);
}
public static final Double castToDouble(Object value) {
if (value == null) {
return null;
}
if (value instanceof Number) {
return ((Number) value).doubleValue();
}
if (value instanceof String) {
String strVal = value.toString();
if (strVal.length() == 0) {
return null;
}
return Double.parseDouble(strVal);
}
throw new JSONException("can not cast to double, value : " + value);
}
public static final Date castToDate(Object value) {
if (value == null) {
return null;
}
if (value instanceof Calendar) {
return ((Calendar) value).getTime();
}
if (value instanceof Date) {
return (Date) value;
}
long longValue = -1;
if (value instanceof Number) {
longValue = ((Number) value).longValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.indexOf('-') != -1) {
String format;
if (strVal.length() == 10) {
format = "yyyy-MM-dd";
} else if (strVal.length() == "yyyy-MM-dd HH:mm:ss".length()) {
format = "yyyy-MM-dd HH:mm:ss";
} else {
format = "yyyy-MM-dd HH:mm:ss.SSS";
}
SimpleDateFormat dateFormat = new SimpleDateFormat(format);
try {
return (Date) dateFormat.parse(strVal);
} catch (ParseException e) {
throw new JSONException("can not cast to Date, value : " + strVal);
}
}
if (strVal.length() == 0) {
return null;
}
longValue = Long.parseLong(strVal);
}
if (longValue < 0) {
throw new JSONException("can not cast to Date, value : " + value);
}
return new Date(longValue);
}
public static final java.sql.Date castToSqlDate(Object value) {
if (value == null) {
return null;
}
if (value instanceof Calendar) {
return new java.sql.Date(((Calendar) value).getTimeInMillis());
}
if (value instanceof java.sql.Date) {
return (java.sql.Date) value;
}
if (value instanceof java.util.Date) {
return new java.sql.Date(((java.util.Date) value).getTime());
}
long longValue = 0;
if (value instanceof Number) {
longValue = ((Number) value).longValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.length() == 0) {
return null;
}
longValue = Long.parseLong(strVal);
}
if (longValue <= 0) {
throw new JSONException("can not cast to Date, value : " + value);
}
return new java.sql.Date(longValue);
}
public static final java.sql.Timestamp castToTimestamp(Object value) {
if (value == null) {
return null;
}
if (value instanceof Calendar) {
return new java.sql.Timestamp(((Calendar) value).getTimeInMillis());
}
if (value instanceof java.sql.Timestamp) {
return (java.sql.Timestamp) value;
}
if (value instanceof java.util.Date) {
return new java.sql.Timestamp(((java.util.Date) value).getTime());
}
long longValue = 0;
if (value instanceof Number) {
longValue = ((Number) value).longValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.length() == 0) {
return null;
}
longValue = Long.parseLong(strVal);
}
if (longValue <= 0) {
throw new JSONException("can not cast to Date, value : " + value);
}
return new java.sql.Timestamp(longValue);
}
public static final Long castToLong(Object value) {
if (value == null) {
return null;
}
if (value instanceof Number) {
return ((Number) value).longValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.length() == 0) {
return null;
}
try {
return Long.parseLong(strVal);
} catch (NumberFormatException ex) {
//
}
}
throw new JSONException("can not cast to long, value : " + value);
}
public static final Integer castToInt(Object value) {
if (value == null) {
return null;
}
if (value instanceof Integer) {
return (Integer) value;
}
if (value instanceof Number) {
return ((Number) value).intValue();
}
if (value instanceof String) {
String strVal = (String) value;
if (strVal.length() == 0) {
return null;
}
return Integer.parseInt(strVal);
}
throw new JSONException("can not cast to int, value : " + value);
}
public static final byte[] castToBytes(Object value) {
if (value instanceof byte[]) {
return (byte[]) value;
}
if (value instanceof String) {
return Base64.decodeFast((String) value);
}
throw new JSONException("can not cast to int, value : " + value);
}
public static final Boolean castToBoolean(Object value) {
if (value == null) {
return null;
}
if (value instanceof Boolean) {
return (Boolean) value;
}
if (value instanceof Number) {
return ((Number) value).intValue() == 1;
}
if (value instanceof String) {
String str = (String) value;
if (str.length() == 0) {
return null;
}
if ("true".equals(str)) {
return Boolean.TRUE;
}
if ("false".equals(str)) {
return Boolean.FALSE;
}
if ("1".equals(str)) {
return Boolean.TRUE;
}
}
throw new JSONException("can not cast to int, value : " + value);
}
public static final <T> T castToJavaBean(Object obj, Class<T> clazz) {
return cast(obj, clazz);
}
@SuppressWarnings({"unchecked", "rawtypes"})
public static final <T> T cast(Object obj, Class<T> clazz) {
if (obj == null) {
return null;
}
if (clazz == null) {
throw new IllegalArgumentException("clazz is null");
}
if (clazz == obj.getClass()) {
return (T) obj;
}
if (obj instanceof Map) {
if (clazz == Map.class) {
return (T) obj;
}
return castToJavaBean(obj, clazz);
}
if (clazz.isArray()) {
if (obj instanceof Collection) {
Collection collection = (Collection) obj;
int index = 0;
Object array = Array.newInstance(clazz.getComponentType(), collection.size());
for (Object item : collection) {
Object value = cast(item, clazz.getComponentType());
Array.set(array, index, value);
index++;
}
return (T) array;
}
}
if (clazz.isAssignableFrom(obj.getClass())) {
return (T) obj;
}
if (clazz == boolean.class || clazz == Boolean.class) {
return (T) castToBoolean(obj);
}
if (clazz == byte.class || clazz == Byte.class) {
return (T) castToByte(obj);
}
// if (clazz == char.class || clazz == Character.class) {
// return (T) castToCharacter(obj);
// }
if (clazz == short.class || clazz == Short.class) {
return (T) castToShort(obj);
}
if (clazz == int.class || clazz == Integer.class) {
return (T) castToInt(obj);
}
if (clazz == long.class || clazz == Long.class) {
return (T) castToLong(obj);
}
if (clazz == float.class || clazz == Float.class) {
return (T) castToFloat(obj);
}
if (clazz == double.class || clazz == Double.class) {
return (T) castToDouble(obj);
}
if (clazz == String.class) {
return (T) castToString(obj);
}
if (clazz == BigDecimal.class) {
return (T) castToBigDecimal(obj);
}
if (clazz == BigInteger.class) {
return (T) castToBigInteger(obj);
}
if (clazz == Date.class) {
return (T) castToDate(obj);
}
if (clazz == java.sql.Date.class) {
return (T) castToSqlDate(obj);
}
if (clazz == java.sql.Timestamp.class) {
return (T) castToTimestamp(obj);
}
if (clazz.isEnum()) {
return (T) castToEnum(obj, clazz);
}
if (Calendar.class.isAssignableFrom(clazz)) {
Date date = castToDate(obj);
Calendar calendar;
if (clazz == Calendar.class) {
calendar = Calendar.getInstance();
} else {
try {
calendar = (Calendar) clazz.newInstance();
} catch (Exception e) {
throw new JSONException("can not cast to : " + clazz.getName(), e);
}
}
calendar.setTime(date);
return (T) calendar;
}
if (obj instanceof String) {
String strVal = (String) obj;
if (strVal.length() == 0) {
return null;
}
}
throw new JSONException("can not cast to : " + clazz.getName());
}
@SuppressWarnings({"unchecked", "rawtypes"})
public static final <T> T castToEnum(Object obj, Class<T> clazz) {
try {
if (obj instanceof String) {
String name = (String) obj;
if (name.length() == 0) {
return null;
}
return (T) Enum.valueOf((Class<? extends Enum>) clazz, name);
}
if (obj instanceof Number) {
int ordinal = ((Number) obj).intValue();
Method method = clazz.getMethod("values");
Object[] values = (Object[]) method.invoke(null);
for (Object value : values) {
Enum e = (Enum) value;
if (e.ordinal() == ordinal) {
return (T) e;
}
}
}
} catch (Exception ex) {
throw new JSONException("can not cast to : " + clazz.getName(), ex);
}
throw new JSONException("can not cast to : " + clazz.getName());
}
}