1 files changed, 72 insertions, 0 deletions
diff --git a/src/main/java/com/code_intelligence/jazzer/mutation/support/StreamSupport.java b/src/main/java/com/code_intelligence/jazzer/mutation/support/StreamSupport.java
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index 00000000..b61980c4
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+++ b/src/main/java/com/code_intelligence/jazzer/mutation/support/StreamSupport.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2023 Code Intelligence GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.code_intelligence.jazzer.mutation.support;
+
+import static java.util.stream.Collectors.toList;
+
+import java.util.AbstractMap.SimpleEntry;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Optional;
+import java.util.function.IntFunction;
+import java.util.stream.Stream;
+
+public final class StreamSupport {
+  private StreamSupport() {}
+
+  public static boolean[] toBooleanArray(Stream<Boolean> stream) {
+    List<Boolean> list = stream.collect(toList());
+    boolean[] array = new boolean[list.size()];
+    for (int i = 0; i < list.size(); i++) {
+      array[i] = list.get(i);
+    }
+    return array;
+  }
+
+  /**
+   * @return the first present value, otherwise {@link Optional#empty()}
+   */
+  public static <T> Optional<T> findFirstPresent(Stream<Optional<T>> stream) {
+    return stream.filter(Optional::isPresent).map(Optional::get).findFirst();
+  }
+
+  /**
+   * @return an array with the values if all {@link Optional}s are present, otherwise
+   * {@link Optional#empty()}
+   */
+  public static <T> Optional<T[]> toArrayOrEmpty(
+      Stream<Optional<T>> stream, IntFunction<T[]> newArray) {
+    try {
+      return Optional.of(stream.map(Optional::get).toArray(newArray));
+    } catch (NoSuchElementException e) {
+      return Optional.empty();
+    }
+  }
+
+  /**
+   * Return a stream containing the optional value if present, otherwise an empty stream.
+   *
+   * @return stream containing the optional value
+   */
+  public static <T> Stream<T> getOrEmpty(Optional<T> optional) {
+    return optional.isPresent() ? Stream.of(optional.get()) : Stream.empty();
+  }
+
+  public static <K, V> SimpleEntry<K, V> entry(K key, V value) {
+    return new SimpleEntry<>(key, value);
+  }
+}