Editable multimap index

Editable multimap index

By : user2955505
Date : November 22 2020, 10:40 AM
I hope this helps . You can create a method that return a mutable Multimap, like the index function, like this:
code :
public static <K, V> Multimap<K, V> indexMutable(Iterable<V> values,
        Function<? super V, K> function) {

    // check null value, function
    Multimap<K, V> map = ArrayListMultimap.create();

    for (V v : values) {
        // check null V
        map.put(function.apply(v), v);

    return map;
public void testMutableMap() throws Exception {

    List<String> badGuys = Arrays.asList("Inky", "Blinky", "Pinky",
            "Pinky", "Clyde");
    Function<String, Integer> stringLengthFunction = new Function<String, Integer>() {

        public Integer apply(String input) {
            return input.length();

    Multimap<Integer, String> multipmap = indexMutable(badGuys,

    System.out.println("It's mutable!");

    for (String guy : badGuys) {

{4=[Inky], 5=[Pinky, Pinky, Clyde], 6=[Blinky]}
It's mutable!
{4=[Inky], 5=[Pinky, Pinky, Clyde], 6=[Blinky]}

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RavenDB MultiMap Index

RavenDB MultiMap Index

By : Gabriel St-Hilaire
Date : March 29 2020, 07:55 AM
hop of those help? It looks like you're trying to fit a document database with an object model that has relationships. This blog may help you:
Keeping a Domain Model Pure with RavenDB
Raven DB: What's wrong with this multimap/reduce index?

Raven DB: What's wrong with this multimap/reduce index?

By : Gareth
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The indexing error sequence contains no matching elements is a result of invoking First on an empty collection which is why you should use FirstOrDefault. Also, referencing your own classes in map and reduce declarations will cause errors because RavenDB can't resolve those types at indexing time.
How to index a multimap based on several criteria?

How to index a multimap based on several criteria?

By : Erik
Date : March 29 2020, 07:55 AM
it should still fix some issue The problem with your code is the key. Collapsing value into a string in order to obtain a key is not a good idea. I would create a key object and use the rest of your code:
code :
public class PersonGroup{
    private String name;
    private Date input;
    private Date output;
    private String value;

    public PersonGroup(String name, Date input, Date output, String value) {
        this.name = name;
        this.input = input;
        this.output = output;
        this.value = value;

    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        PersonGroup that = (PersonGroup) o;

        if (input != null ? !input.equals(that.input) : that.input != null) return false;
        if (name != null ? !name.equals(that.name) : that.name != null) return false;
        if (output != null ? !output.equals(that.output) : that.output != null) return false;
        if (value != null ? !value.equals(that.value) : that.value != null) return false;

        return true;

    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + (input != null ? input.hashCode() : 0);
        result = 31 * result + (output != null ? output.hashCode() : 0);
        result = 31 * result + (value != null ? value.hashCode() : 0);
        return result;
private ImmutableListMultimap<PersonGroup, SomeClass> getGrouped() {
        return Multimaps.index
                (someClassList, new Function<SomeClass, PersonGroup>() {
                    public PersonGroup apply(SomeClass someClass) {
                        return new PersonGroup(someClass.getName(), someClass.getInputDate(), someClass
                                .getOutputDate(), someClass.getValue());
RavenDB Multimap index - documents not in both collections

RavenDB Multimap index - documents not in both collections

By : itsalive
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You don't need to create a multimap index. With the Index below you can get get all your waiting lists with the client:
code :
session.Store(new Client() { Id = "client/1", Name = "Client 1" });
session.Store(new Client() { Id = "client/2", Name = "Client 2" });
session.Store(new Client() { Id = "client/3", Name = "Client 3" });

session.Store(new WaitingListEntry() { Id = "waitingListEntry/1", ClientId = "client/1", OtherDocumentInformation = "Info" });
session.Store(new WaitingListEntry() { Id = "waitingListEntry/2", ClientId = "client/2", OtherDocumentInformation = "Info" });

How to get index of an element in value of MultiMap

How to get index of an element in value of MultiMap

By : John Caliente
Date : March 29 2020, 07:55 AM
This might help you First of all, MultiValueMap is deprecated, you should use MultiValuedMap instead. https://commons.apache.org/proper/commons-collections/apidocs/org/apache/commons/collections4/MultiValuedMap.html
code :
MultiValuedMap<String, String> mhm = new ArrayListValuedHashMap<String, String>();
List<String> itemsWithKey = mhm.get(key);
MultiMap mhm = new MultiValueMap();
String key ="";
key = "Group One";
mhm.put(key, "Item One");
mhm.put(key, "Item Two");
mhm.put(key, "Item Three");

key = "Group Two";
mhm.put(key, "Item Four");
mhm.put(key, "Item Five");

System.out.println(mhm.containsValue("Item One"));
System.out.println(mhm.containsValue("Item Nine"));
MultiMap mhm = new MultiValueMap();
String key ="";
key = "Group One";
mhm.put(key, "Item One");
mhm.put(key, "Item Two");
mhm.put(key, "Item Three");

key = "Group Two";
mhm.put(key, "Item Four");
mhm.put(key, "Item Five");

Set<String> keys = mhm.keySet();

String itemToLookFor = "Item Four";

for(String k : keys) {
    List<String> itemsWithKey = (List<String>) mhm.get(k);
    boolean doesExists = itemsWithKey.contains(itemToLookFor);
    System.out.println("does " + itemToLookFor + " exists for key " + k + ": " +doesExists); 
does Item Four exists for key Group One: false
does Item Four exists for key Group Two: true
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