@SuppressWarnings({"unchecked", "rawtypes"})
public static boolean filterFields(
Object obj, FieldMatcher matcher, Dao dao, Callback2<MappingField, Object> callback) {
if (obj == null) return false;
obj = Lang.first(obj);
if (obj == null) {
return false;
}
if (obj.getClass() == Class.class) {
throw Lang.impossible();
}
if (obj instanceof String || obj instanceof Number || obj instanceof Boolean) {
throw Lang.impossible();
}
Entity en = dao.getEntity(obj.getClass());
if (en == null) {
throw Lang.impossible();
}
List<MappingField> mfs = en.getMappingFields();
if (matcher != null) {
Iterator<MappingField> it = mfs.iterator();
while (it.hasNext()) {
MappingField mf = it.next();
if (!matcher.match(mf.getName())) it.remove();
}
}
boolean flag = false;
for (MappingField mf : mfs) {
if (matcher.isIgnoreId() && mf.isId()) continue;
if (matcher.isIgnoreName() && mf.isName()) continue;
if (matcher.isIgnorePk() && mf.isCompositePk()) continue;
Object val = mf.getValue(obj);
if (val == null) {
if (matcher.isIgnoreNull()) continue;
}
if (val instanceof Number && ((Number) val).doubleValue() == 0.0) {
if (matcher.isIgnoreZero()) continue;
}
if (val instanceof Date) {
if (matcher.isIgnoreDate()) continue;
}
callback.invoke(mf, val);
flag = true;
}
return flag;
}
/**
* 转换一个 POJO 从一个指定的类型到另外的类型
*
* @param src 源对象
* @param fromType 源对象类型
* @param toType 目标类型
* @param args 转换时参数。有些 Castor 可能需要这个参数，比如 Array2Map
* @return 目标对象
* @throws FailToCastObjectException 如果没有找到转换器，或者转换失败
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public <F, T> T cast(Object src, Class<F> fromType, Class<T> toType, String... args)
throws FailToCastObjectException {
if (null == src) {
// 原生数据的默认值
if (toType.isPrimitive()) {
if (toType == int.class) return (T) Integer.valueOf(0);
else if (toType == long.class) return (T) Long.valueOf(0L);
else if (toType == byte.class) return (T) Byte.valueOf((byte) 0);
else if (toType == short.class) return (T) Short.valueOf((short) 0);
else if (toType == float.class) return (T) Float.valueOf(.0f);
else if (toType == double.class) return (T) Double.valueOf(.0);
else if (toType == boolean.class) return (T) Boolean.FALSE;
else if (toType == char.class) return (T) Character.valueOf(' ');
throw Lang.impossible();
}
// 是对象，直接返回 null
return null;
}
if (fromType == toType || toType == null || fromType == null) return (T) src;
if (fromType.getName().equals(toType.getName())) return (T) src;
if (toType.isAssignableFrom(fromType)) return (T) src;
Mirror<?> from = Mirror.me(fromType, extractor);
if (from.canCastToDirectly(toType)) // Use language built-in cases
return (T) src;
Castor c = find(from, toType);
if (null == c)
throw new FailToCastObjectException(
String.format(
"Can not find castor for '%s'=>'%s' in (%d) because:\n%s",
fromType.getName(), toType.getName(), map.size(), "Fail to find matched castor"));
try {
return (T) c.cast(src, toType, args);
} catch (FailToCastObjectException e) {
throw e;
} catch (Exception e) {
throw new FailToCastObjectException(
String.format(
"Fail to cast from <%s> to <%s> for {%s} because:\n%s:%s",
fromType.getName(),
toType.getName(),
src,
e.getClass().getSimpleName(),
e.getMessage()),
Lang.unwrapThrow(e));
}
}
private Tmpl(String tmpl, Pattern ptn, int groupIndex) {
this(ptn, groupIndex);
// 开始解析
Matcher m = _P.matcher(tmpl);
int lastIndex = 0;
while (m.find()) {
int pos = m.start();
// 看看是否要生成静态对象
if (pos > lastIndex) {
list.add(new TmplStaticEle(tmpl.substring(lastIndex, pos)));
}
// 分析键
Matcher m2 = _P2.matcher(m.group(this.groupIndex));
if (!m2.find()) throw Lang.makeThrow("Fail to parse tmpl key '%s'", m.group(1));
String key = m2.group(1);
String type = Strings.sNull(m2.group(3), "string");
String fmt = m2.group(5);
String dft = m2.group(7);
// 记录键
keys.add(key);
// 创建元素
if ("string".equals(type)) {
list.add(new TmplStringEle(key, dft));
}
// int
else if ("int".equals(type)) {
list.add(new TmplIntEle(key, fmt, dft));
}
// long
else if ("long".equals(type)) {
list.add(new TmplLongEle(key, fmt, dft));
}
// boolean
else if ("boolean".equals(type)) {
list.add(new TmplBooleanEle(key, fmt, dft));
}
// float
else if ("float".equals(type)) {
list.add(new TmplFloatEle(key, fmt, dft));
}
// double
else if ("double".equals(type)) {
list.add(new TmplDoubleEle(key, fmt, dft));
}
// date
else if ("date".equals(type)) {
list.add(new TmplDateEle(key, fmt, dft));
}
// 靠不可能
else {
throw Lang.impossible();
}
// 记录
lastIndex = m.end();
}
// 最后结尾是否要加入一个对象
if (!(lastIndex >= tmpl.length())) {
list.add(new TmplStaticEle(tmpl.substring(lastIndex)));
}
}