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examples/src/test/java/examples/HowToCollectToCustomTypesTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,39 +1,57 @@ | ||
| package examples; | ||
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| import static com.google.common.truth.Truth.assertThat; | ||
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| import org.junit.Test; | ||
| import org.junit.runner.RunWith; | ||
| import org.junit.runners.JUnit4; | ||
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| import com.google.common.collect.ImmutableListMultimap; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import com.google.common.collect.ImmutableRangeMap; | ||
| import com.google.common.collect.Range; | ||
| import com.google.mu.util.stream.BiCollector; | ||
| import com.google.mu.util.stream.BiStream; | ||
| import org.junit.Test; | ||
| import org.junit.runner.RunWith; | ||
| import org.junit.runners.JUnit4; | ||
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| import java.util.function.Function; | ||
| import java.util.stream.Collector; | ||
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| import static com.google.common.truth.Truth.assertThat; | ||
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| /** Some examples to show how {@link BiStream#collect} can be used to collect to custom types. */ | ||
| @RunWith(JUnit4.class) | ||
| public class HowToCollectToCustomTypesTest { | ||
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| @Test public void how_to_collect_to_immutableMap() { | ||
| BiStream<String, Integer> biStream = BiStream.of("one", 1, "two", 2); | ||
| ImmutableMap<String, Integer> map = biStream.collect(ImmutableMap::toImmutableMap); | ||
| ImmutableMap<String, Integer> map = biStream.collect(new BiCollector<String, Integer, ImmutableMap<String, Integer>>() { | ||
| @Override | ||
| public <E> Collector<E, ?, ImmutableMap<String, Integer>> bisecting(Function<E, String> toKey, Function<E, Integer> toValue) { | ||
| return ImmutableMap.toImmutableMap(toKey,toValue); | ||
| } | ||
| }); | ||
| assertThat(map).containsExactly("one", 1, "two", 2); | ||
| } | ||
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| @Test public void how_to_collect_to_immutableListMultimap() { | ||
| BiStream<String, Integer> biStream = BiStream.of("one", 1, "two", 2); | ||
| ImmutableListMultimap<String, Integer> map = | ||
| biStream.collect(ImmutableListMultimap::toImmutableListMultimap); | ||
| biStream.collect(new BiCollector<String, Integer, ImmutableListMultimap<String, Integer>>() { | ||
| @Override | ||
| public <E> Collector<E, ?, ImmutableListMultimap<String, Integer>> bisecting(Function<E, String> toKey, Function<E, Integer> toValue) { | ||
| return ImmutableListMultimap.toImmutableListMultimap(toKey,toValue); | ||
| } | ||
| }); | ||
| assertThat(map).containsExactly("one", 1, "two", 2); | ||
| } | ||
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| @Test public void how_to_collect_to_immutableRangeMap() { | ||
| BiStream<Range<Integer>, String> biStream = | ||
| BiStream.of(Range.closed(10, 19), "ten", Range.closed(20, 29), "twenty"); | ||
| ImmutableRangeMap<Integer, String> map = | ||
| biStream.collect(ImmutableRangeMap::toImmutableRangeMap); | ||
| biStream.collect(new BiCollector<Range<Integer>, String, ImmutableRangeMap<Integer, String>>() { | ||
| @Override | ||
| public <E> Collector<E, ?, ImmutableRangeMap<Integer, String>> bisecting(Function<E, Range<Integer>> toKey, Function<E, String> toValue) { | ||
| return ImmutableRangeMap.toImmutableRangeMap(toKey,toValue); | ||
| } | ||
| }); | ||
| assertThat(map.get(12)).isEqualTo("ten"); | ||
| } | ||
| } |
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