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MapStream extensions - anyMatch, allMatch, noneMatch with BiPredicate #1832

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Oct 19, 2018
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MapStream extensions - anyMatch, allMatch, noneMatch with BiPredicate #1832

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MapStream extensions - anyMatch, allMatch, noneMatch with BiPredicate
Oct 19, 2018
d3d0ad4
Forgotten import
Oct 19, 2018
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39 changes: 39 additions & 0 deletions modules/collect/src/main/java/com/opengamma/strata/collect/MapStream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
import java.util.Spliterator;
import java.util.function.BiConsumer;
import java.util.function.BiFunction;
import java.util.function.BiPredicate;
import java.util.function.BinaryOperator;
import java.util.function.Consumer;
import java.util.function.Function;
Expand Down Expand Up @@ -546,6 +547,44 @@ public Optional<Map.Entry<K, V>> maxValues(Comparator<? super V> comparator) {
return underlying.max((e1, e2) -> comparator.compare(e1.getValue(), e2.getValue()));
}

//-----------------------------------------------------------------------
/**
* Returns whether any elements of this stream match the provided predicate.
* <p>
* This is a short-circuiting terminal operation.
*
* @param predicate the predicate to apply to the entries
* @return whether any of the entries matched the predicate
*/
public boolean anyMatch(BiPredicate<? super K, ? super V> predicate) {
return underlying.anyMatch(e -> predicate.test(e.getKey(), e.getValue()));
}


/**
* Returns whether all elements of this stream match the provided predicate.
* <p>
* This is a short-circuiting terminal operation.
*
* @param predicate the predicate to apply to the entries
* @return whether all of the entries matched the predicate
*/
public boolean allMatch(BiPredicate<? super K, ? super V> predicate) {
return underlying.allMatch(e -> predicate.test(e.getKey(), e.getValue()));
}

/**
* Returns whether no elements of this stream match the provided predicate.
* <p>
* This is a short-circuiting terminal operation.
*
* @param predicate the predicate to apply to the entries
* @return whether none of the entries matched the predicate
*/
public boolean noneMatch(BiPredicate<? super K, ? super V> predicate) {
return underlying.noneMatch(e -> predicate.test(e.getKey(), e.getValue()));
}

//-------------------------------------------------------------------------
/**
* Returns an immutable map built from the entries in the stream.
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19 changes: 19 additions & 0 deletions modules/collect/src/test/java/com/opengamma/strata/collect/MapStreamTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -276,6 +276,25 @@ public void maxValues() {
assertThat(result).isEqualTo(entry("four", 4));
}

//-----------------------------------------------------------------------
public void anyMatch() {
assertThat(MapStream.of(map).anyMatch((key, value) -> key.length() + value < 10)).isTrue();
assertThat(MapStream.of(map).anyMatch((key, value) -> key.length() + value < 8)).isTrue();
assertThat(MapStream.of(map).anyMatch((key, value) -> key.length() + value < 4)).isFalse();
}

public void allMatch() {
assertThat(MapStream.of(map).allMatch((key, value) -> key.length() + value < 10)).isTrue();
assertThat(MapStream.of(map).allMatch((key, value) -> key.length() + value < 8)).isFalse();
assertThat(MapStream.of(map).allMatch((key, value) -> key.length() + value < 4)).isFalse();
}

public void noneMatch() {
assertThat(MapStream.of(map).noneMatch((key, value) -> key.length() + value < 10)).isFalse();
assertThat(MapStream.of(map).noneMatch((key, value) -> key.length() + value < 8)).isFalse();
assertThat(MapStream.of(map).noneMatch((key, value) -> key.length() + value < 4)).isTrue();
}

//-----------------------------------------------------------------------
public void forEach() {
HashMap<Object, Object> mutableMap = new HashMap<>();
Expand Down