1 import com.google.common.collect.Maps;
2 import org.apache.commons.lang3.StringUtils;
3
4 import java.lang.reflect.Method;
5 import java.util.ArrayList;
6 import java.util.List;
7 import java.util.Map;
8
9 public class ListChangeMapUtils {
10
11 public static <T> Map<String, List<T>> objStringAndListToMapClassificationByName(List<T> list, String name) {
12 Map<String, List<T>> resultMap = Maps.newHashMap();
13 for (T obj : list) {
14 try {
15 Method method = obj.getClass().getMethod("get" + name);
16 String keyName = (String) method.invoke(obj);
17 if (StringUtils.isBlank(keyName)) {
18 continue;
19 }
20 List<T> tempList = null;
21 if (!resultMap.containsKey(keyName)) {
22 tempList = new ArrayList<>();
23 } else {
24 tempList = resultMap.get(keyName);
25 }
26 tempList.add(obj);
27 resultMap.put(keyName, tempList);
28 } catch (Exception e) {
29
30 }
31 }
32 return resultMap;
33 }
34
35 public static <T> Map<Long, List<T>> objLongAndListToMapClassificationByName(List<T> list, String name) {
36 Map<Long, List<T>> resultMap = Maps.newHashMap();
37 for (T obj : list) {
38 try {
39 Method method = obj.getClass().getMethod("get" + name);
40 Long keyName = (Long) method.invoke(obj);
41 if (keyName == null) {
42 continue;
43 }
44 List<T> tempList = null;
45 if (!resultMap.containsKey(keyName)) {
46 tempList = new ArrayList<>();
47 } else {
48 tempList = resultMap.get(keyName);
49 }
50 tempList.add(obj);
51 resultMap.put(keyName, tempList);
52 } catch (Exception e) {
53
54 }
55 }
56 return resultMap;
57 }
58
59 public static <T> Map<Integer, List<T>> objIntegerAndListToMapClassificationByName(List<T> list, String name) {
60 Map<Integer, List<T>> resultMap = Maps.newHashMap();
61 for (T obj : list) {
62 try {
63 Method method = obj.getClass().getMethod("get" + name);
64 Integer keyName = (Integer) method.invoke(obj);
65 if (keyName == null) {
66 continue;
67 }
68 List<T> tempList = null;
69 if (!resultMap.containsKey(keyName)) {
70 tempList = new ArrayList<>();
71 } else {
72 tempList = resultMap.get(keyName);
73 }
74 tempList.add(obj);
75 resultMap.put(keyName, tempList);
76 } catch (Exception e) {
77
78 }
79 }
80 return resultMap;
81 }
82 }
