Find top N elements in a Multiset from Google Collections?

Posted by dfrankow on Stack Overflow See other posts from Stack Overflow or by dfrankow
Published on 2010-06-12T15:25:22Z Indexed on 2010/06/12 15:32 UTC
Read the original article Hit count: 234

Filed under:

java

|

guava

|

multiset

A Google Collections Multiset is a set of elements each of which has a count (i.e. may be present multiple times).

I can't tell you how many times I want to do the following

Make a histogram (exactly Multiset)
Get the top N values from the histogram

Examples: top 10 URLs, top 10 tags, ...

What is the canonical way to do #2 given a Multiset?

Here is a blog post about it, but that code is not quite what I want. First, it returns everything, not just top N. Second, it copies (is it possible to avoid a copy?). Third, I usually want a deterministic sort, i.e. tiebreak if counts are equal.

© Stack Overflow or respective owner

Related posts about java

Tomcat 6: Access Control Exception?

as seen on Server Fault - Search for 'Server Fault'
I'm trying to setup a tomcat6 server, and I'm trying to match another setup someone else established. However, my deployment (default Ubuntu install) uses a policy.d/ directory structure, and the established server just uses a catalina.policy file. I've tried setting every entry in policy.d to match… >>> More
Problem in creation MDB Queue connection at Jboss StartUp

as seen on Stack Overflow - Search for 'Stack Overflow'
I am not able to create a Queue connection in JBOSS4.2.3GA Version & Java1.5, as I am using MDB as per the below details. I am putting this MDB in a jar file(named utsJar.jar) and copied it in deploy folder of JBOSS, In the test env. this MDB works well but in another env. [ env settings and… >>> More
failing to establish connection between Postgres db and gwt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am using Postgres and gwt 2.0 for one of my applications. I am facing problem connecting to the database. When I try to connect it gives "ClassNotFoundException". Here is what I get when I try to connect to database: java.lang.ClassNotFoundException: org.postgresql.Driver at java.net… >>> More
failing to establish connection between postgre db and gwt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, For i am using postgre and gwt 2.0 for one of my applications. I am facing problem connecting to the database. When i try to connect it gives "ClassNotFoundException". Here is what i get when i try to connect to database: java.lang.ClassNotFoundException: org.postgresql.Driver at java.net… >>> More
Migration and deployement problems JBoss 4.2.2.GA to JBoss 6.0.0.M2

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm trying to migrate an application running on JBoss 4.2.2.GA to JBoss 6.0.0.M2 I give you some log to explain my problem : boot.log : 2010-03-16 09:59:29,406 ERROR [org.jboss.system.server.profileservice.ProfileServiceBootstrap] (Thread-2) Failed to load profile: Summary of incomplete deployments… >>> More

Related posts about guava

is guava-libraries available in maven repo?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am looking to find guava-libraries in maven repository. It looks like guava is adding more features to google-collections library. >>> More
How do the versions of Guava work?

as seen on Stack Overflow - Search for 'Stack Overflow'
I would like to use Guava in a project, but my PM doesn't like the "r05" suffix, saying that it looks like it's not stable. In fact, the part I need is only the Google-Collections 1.0 which is now deprecated (my PM doesn't like that word either). So I don't really get the versioning of Guava/Google-Collections… >>> More
Combine guava's ImmutableList and varargs

as seen on Stack Overflow - Search for 'Stack Overflow'
I want create constructor that will take one or more integers and save it into field as ImmutableList. According to "The right way to use varargs to pass one or more arguments" by Bloch's Item 42 I create smt like class Foo{ private final ImmutableList<Integer> bar; public Foo(Integer… >>> More
Is Guava's ImmutableList.Builder thread safe?

as seen on Stack Overflow - Search for 'Stack Overflow'
What are the thread safety guarantees for Guava's ImmutableList.Builder? The javadocs don't say. >>> More
Where can I find PrimiteArrays in Guava?

as seen on Stack Overflow - Search for 'Stack Overflow'
I was using com.google.common.collect.PrimitiveArrays from Google Collections, however I cannot find it in Guava, was it renamed? Where can I find it? >>> More