public final class BloomFilter<T extends @Nullable Object> implements Predicate<T>, Serializable {
  /**
   * A strategy to translate T instances, to {@code numHashFunctions} bit indexes.
   *
   * <p>Implementations should be collections of pure functions (i.e. stateless).
   */
  interface Strategy extends Serializable {

    /**
     * Sets {@code numHashFunctions} bits of the given bit array, by hashing a user element.
     *

        final String json = new JsonIndexExportFormatter().format(source, Collections.emptySet());

        assertFalse(json.contains("field_with_null"));
    }

    @Test
    public void test_jsonFormatter_emptyMap() {
        final String json = new JsonIndexExportFormatter().format(Collections.emptyMap(), Collections.emptySet());

        assertTrue(json.contains("{"));

            final boolean hasRelevantResults) {
        this.relevantDocIds = relevantDocIds != null ? Collections.unmodifiableList(relevantDocIds) : Collections.emptyList();
        this.relevantIndexes = relevantIndexes != null ? Collections.unmodifiableList(relevantIndexes) : Collections.emptyList();
        this.hasRelevantResults = hasRelevantResults;
    }

    /**
     * Returns the list of relevant document IDs.

        userResult.setToolchains(Collections.singletonList(toolchain));

        props = new Properties();
        props.put("key", "global_value");
        toolchain = new ToolchainModel();
        toolchain.setType("TYPE");
        toolchain.setProvides(props);
        PersistedToolchains globalResult = new PersistedToolchains();
        globalResult.setToolchains(Collections.singletonList(toolchain));

        final Set<String> merged = new LinkedHashSet<>();

        if (array1 != null) {
            Collections.addAll(merged, array1);
        }

        if (array2 != null) {
            Collections.addAll(merged, array2);
        }

        return merged.toArray(new String[merged.size()]);
    }

    /**

 *
 * <p>For example, to test {@link java.util.Collections#unmodifiableList(java.util.List)
 * Collections.unmodifiableList}'s iterator:
 *
 * {@snippet :
 * List<String> expectedElements = Arrays.asList("a", "b", "c", "d", "e");
 * List<String> actualElements =
 *     Collections.unmodifiableList(Arrays.asList("a", "b", "c", "d", "e"));
 * IteratorTester<String> iteratorTester =

      "capabilities": [
        {
          "group": "com.google.guava",
          "name": "guava",
          "version": "${pom.version}"
        },
        {
          "group": "com.google.collections",
          "name": "google-collections",
          "version": "${pom.version}"
        }
      ]
    },
    {
      "name": "${variant.jvmEnvironmentVariantName}RuntimeElements",
      "attributes": {

        return Collections.unmodifiableList(new MappedList<>(
                getMavenProject(project).getRemoteProjectRepositories(), session::getRemoteRepository));
    }

    @Override
    @Nonnull
    public List<RemoteRepository> getRemotePluginRepositories(@Nonnull Project project) {
        return Collections.unmodifiableList(

            .addValue(Arrays.asList("C"))
            .addValue(Arrays.asList())
            .add(SHORT_NAME, Collections.singletonMap("k1", "v1"))
            .add(LONG_NAME, Collections.singletonMap("k2", "v2"))
            .addValue(Collections.singletonMap("k3", "v3"))
            .addValue(Collections.emptyMap())
            .addValue(null)
            .add(SHORT_NAME, Optional.of("1"))
            .add(LONG_NAME, Optional.of("1"))

      assertThat(graph.edges()).isEmpty(); // no edges can remain if there's no nodes
      AbstractGraphTest.validateGraph(graph);

      Collections.shuffle(nodeList, gen);
      for (Integer node : nodeList) {
        assertThat(graph.addNode(node)).isTrue();
      }
      Collections.shuffle(edgeList, gen);
      for (EndpointPair<Integer> edge : edgeList) {
        assertThat(graph.putEdge(edge.nodeU(), edge.nodeV())).isTrue();