/**
* 构建ResultMap对象
*
* @param id
* @param clazz
* @param configuration
* @return
*/
private ResultMap buildResultMap(String id, Class<?> clazz, Configuration configuration) {
// 判断是否已经存在缓存里
if (configuration.hasResultMap(id)) {
return configuration.getResultMap(id);
}
List<ResultMapping> resultMappings = Lists.newArrayList();
Map<String, Field> columns = EntityUtil.getFields(clazz);
for (Map.Entry<String, Field> column : columns.entrySet()) {
Field field = column.getValue();
String fieldName = field.getName();
Class<?> columnTypeClass = resolveResultJavaType(clazz, fieldName, null);
List<ResultFlag> flags = Lists.newArrayList();
if (field.isAnnotationPresent(Id.class)) {
flags.add(ResultFlag.ID);
}
String columnName = column.getKey();
resultMappings.add(
buildResultMapping(configuration, fieldName, columnName, columnTypeClass, flags));
}
// 构建ResultMap
ResultMap.Builder resultMapBuilder =
new ResultMap.Builder(configuration, id, clazz, resultMappings);
ResultMap rm = resultMapBuilder.build();
// 放到缓存中
configuration.addResultMap(rm);
return rm;
}
