@SuppressWarnings({"rawtypes", "unchecked"})
private void autoMap(Invocation invocation, String name) throws ClassNotFoundException {
final Object[] queryArgs = invocation.getArgs();
final MappedStatement ms = (MappedStatement) queryArgs[0];
final Object parameter = queryArgs[1];
String statementId = ms.getId();
MapperMeta meta = getMapperMeta(ms.getConfiguration(), statementId);
if (meta.isFillEntity()) {
// 将泛型类加入到参数中供CrudTemplate使用
if (parameter != null) {
Map map;
if (parameter instanceof Map) {
map = (HashMap) parameter;
map.put(CrudProvider.CLASS_KEY, meta.getEntity());
} else {
map = new HashMap();
map.put(CrudProvider.PARA_KEY, parameter);
map.put(CrudProvider.CLASS_KEY, meta.getEntity());
}
queryArgs[1] = map;
} else {
queryArgs[1] = meta.getEntity();
}
}
if (meta.isFillResultMap()) {
MetaObject metaMappedStatement = getMetaObject(ms);
metaMappedStatement.setValue("resultMaps", meta.getResultMaps());
}
if (name.equals("query")) {
final RowBounds rowBounds = (RowBounds) queryArgs[2];
if (rowBounds == null || rowBounds == RowBounds.DEFAULT) {
Page p = findPageParameter(queryArgs[1]);
if (p != null) {
queryArgs[2] = new RowBounds(p.getOffset(), p.getLimit());
}
}
}
}
/**
* 根据namespace查找需要的信息，避免每次反射的耗时操作
*
* @param conf
* @param statementId
* @return
* @throws ClassNotFoundException
*/
private MapperMeta getMapperMeta(Configuration conf, final String statementId)
throws ClassNotFoundException {
MapperMeta meta = CACHED.get(statementId);
if (meta == null) {
int pos = statementId.lastIndexOf('.');
String namespace = statementId.substring(0, pos); // mapper类名
String methodName = statementId.substring(pos + 1);
Class<?> mapperClass;
mapperClass = Class.forName(namespace);
synchronized (this) {
meta = CACHED.get(statementId);
if (meta == null) {
meta = buildMapperMeta(conf, namespace, methodName, mapperClass);
CACHED.put(statementId, meta);
}
}
}
return meta;
}
