StackOverflow2013

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plurals

PO
primarykey
Id
10931209
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-06-07T11:50:23.913
FavoriteCount
0
LastActivityDate
2018-05-30T12:45:15.893
LastEditDate
2018-05-30T12:45:15.893
LastEditorUserId
142983
OwnerUserId
142983
ParentId
10930443
PostTypeId
2
Score
13
ViewCount
0
LastEditorDisplayName
text
Body
The fully "functional" way, using Guava, would combine <code>Ordering#explicit()</code> with <code>Ordering#onResultOf()</code> <pre><code>public class UserService { @Inject private UserDao userDao; public List<User> getUsersWithIds(List<Integer> userIds) { List<User> users = userDao.loadUsersWithIds(userIds); Ordering<User> orderById = Ordering.explicit(userIds).onResultOf(UserFunctions.getId()); return orderById.immutableSortedCopy(users); } } </code></pre> You could declare an anonymous function inline, but I like to declare my functions as static factory methods in a separate class, for a cleaner code (the verbosity of Java's function declarations is hidden in the utility class): <pre><code>/** * Static factory methods to create {@link Function}s for {@link User}s. */ public final class UserFunctions { private UserFunctions() { /* prevents instantiation */ } /** * @return a {@link Function} that returns an {@link User}'s id. */ public static Function<User, Integer> getId() { return GetIdFunction.INSTANCE; } // enum singleton pattern private enum GetIdFunction implements Function<User, Integer> { INSTANCE; public Integer apply(User user) { return user.getId(); } } } </code></pre> <hr> As mentioned by @Arne in a comment, this can be simplified in Java 8, using a method reference instead of the <code>UserFunctions</code> class: <pre><code>public class UserService { @Inject private UserDao userDao; public List<User> getUsersWithIds(List<Integer> userIds) { List<User> users = userDao.loadUsersWithIds(userIds); Ordering<User> orderById = Ordering.explicit(userIds).onResultOf(User::getId); return orderById.immutableSortedCopy(immutableSortedCopy(users)); } } </code></pre>
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PostParentId
1. POGuava way of sorting List according to another list?
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1. USEtienne Neveu
UserOwnerUserId
1. USEtienne Neveu
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1. POGuava way of sorting List according to another list?
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