/**
* 将params中的属性([attr(string)->value(object)]，放入到实体类中。
*
* <p>如果引用到了别的实体，那么<br>
* 如果params中的id为null，则将该实体的置为null.<br>
* 否则新生成一个实体，将其id设为params中指定的值。 空字符串按照null处理
*/
public Object populate(Object entity, String entityName, Map<String, Object> params) {
Type type = Model.getType(entityName);
for (final Map.Entry<String, Object> paramEntry : params.entrySet()) {
String attr = paramEntry.getKey();
Object value = paramEntry.getValue();
if (value instanceof String) {
if (Strings.isEmpty((String) value)) {
value = null;
} else if (TRIM_STR) {
value = ((String) value).trim();
}
}
// 主键
if (null != type
&& type.isEntityType()
&& attr.equals(((EntityType) type).getIdPropertyName())) {
if (ValidEntityKeyPredicate.INSTANCE.evaluate(value)) {
setValue(attr, value, entity);
} else {
try {
PropertyUtils.setProperty(entity, attr, null);
} catch (Exception e) {
throw new RuntimeException(e.getMessage());
}
}
continue;
}
// 普通属性
if (-1 == attr.indexOf('.')) {
setValue(attr, value, entity);
} else {
String parentAttr = Strings.substring(attr, 0, attr.lastIndexOf('.'));
try {
ObjectAndType ot = initProperty(entity, entityName, parentAttr);
if (null == ot) {
logger.error("error attr:[" + attr + "] value:[" + value + "]");
continue;
}
// 属性也是实体类对象
if (ot.getType().isEntityType()) {
String foreignKey = ((EntityType) ot.getType()).getIdPropertyName();
if (attr.endsWith("." + foreignKey)) {
if (null == value) {
setValue(parentAttr, null, entity);
} else {
Object foreignValue = PropertyUtils.getProperty(entity, attr);
// 如果外键已经有值
if (null != foreignValue) {
if (!foreignValue.toString().equals(value.toString())) {
setValue(parentAttr, null, entity);
initProperty(entity, entityName, parentAttr);
setValue(attr, value, entity);
}
} else {
setValue(attr, value, entity);
}
}
} else {
setValue(attr, value, entity);
}
} else {
setValue(attr, value, entity);
}
} catch (Exception e) {
logger.error("error attr:[" + attr + "] value:[" + value + "]", e);
}
}
if (logger.isDebugEnabled()) logger.debug("populate attr:[{}] value:[{}]", attr, value);
}
return entity;
}
