Example usage for com.google.common.collect ImmutableListMultimap of

Introduction

In this page you can find the example usage for com.google.common.collect ImmutableListMultimap of.

Prototype

public static <K, V> ImmutableListMultimap<K, V> of(K k1, V v1, K k2, V v2) 

Source Link

Document

Returns an immutable multimap containing the given entries, in order.

Usage

From source file:com.tinspx.util.example.Collect.java

@SuppressWarnings({ "unchecked", "rawtypes" })
public static void selector() {
    Function<Object, String> search = CollectUtils.selector()
            //select value mapped to "a" in a Map or Multimap
            .key("a")
            //select the first value that is a Multimap
            .value(Predicates.instanceOf(Multimap.class))
            //select value mapped to "b" in a Map or Multimap
            .key("b")
            //select the value at index 1 (the second element)
            .value(1)//  w  w w .  j ava2  s.  c o m
            //build the Function expecting a String result
            .get(String.class);

    //create the object to traverse, this can contain any hierarchy
    //of Collection, List, Set, Multiset, Map, Multimap, Table
    Map map = MapUtils.newMutableSingletonMap("a",
            Arrays.asList(null, ImmutableListMultimap.of("b", "b-1", "b", "b-2")));

    String result = search.apply(map);
    System.out.println("map: " + map);
    System.out.println("result: " + result);
    //prints
    //map: {a=[null, {b=[b-1, b-2]}]}
    //result: b-2

    //now slightly modify the map so the search will fail
    map.put("a", Arrays.asList(null, ImmutableListMultimap.of("b", "b-1",
            //second value mapped to "b" is an Integer instead
            //of a String so the search will fail
            "b", 1)));

    result = search.apply(map);
    System.out.println("map: " + map);
    System.out.println("result: " + result);
    //prints
    //{a=[null, {b=[b-1, 1]}]}
    //null
}

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