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-rw-r--r--models-base/src/main/java/org/onap/policy/models/base/PfUtils.java23
-rw-r--r--models-base/src/test/java/org/onap/policy/models/base/PfUtilsTest.java20
2 files changed, 40 insertions, 3 deletions
diff --git a/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java b/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java
index a18315ceb..8e77d3fcf 100644
--- a/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java
+++ b/models-base/src/main/java/org/onap/policy/models/base/PfUtils.java
@@ -1,6 +1,7 @@
-/*-
+/*
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
+ * Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -20,6 +21,10 @@
package org.onap.policy.models.base;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
/**
* Utility class for Policy Framework concept utilities.
*
@@ -56,4 +61,20 @@ public final class PfUtils {
return 0;
}
+
+ /**
+ * Convenience method to apply a mapping function to all of the elements of a list,
+ * generating a new list.
+ *
+ * @param source list whose elements are to be mapped, or {@code null}
+ * @param mapFunc mapping function
+ * @return a new list, containing mappings of all of the items in the original list
+ */
+ public static <T> List<T> mapList(List<T> source, Function<T, T> mapFunc) {
+ if (source == null) {
+ return null;
+ }
+
+ return source.stream().map(mapFunc).collect(Collectors.toList());
+ }
}
diff --git a/models-base/src/test/java/org/onap/policy/models/base/PfUtilsTest.java b/models-base/src/test/java/org/onap/policy/models/base/PfUtilsTest.java
index 2b495a1e7..bdbab5c36 100644
--- a/models-base/src/test/java/org/onap/policy/models/base/PfUtilsTest.java
+++ b/models-base/src/test/java/org/onap/policy/models/base/PfUtilsTest.java
@@ -1,6 +1,7 @@
-/*-
+/*
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
+ * Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -22,7 +23,10 @@ package org.onap.policy.models.base;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import java.util.Arrays;
+import java.util.List;
import org.junit.Test;
/**
@@ -33,11 +37,23 @@ import org.junit.Test;
public class PfUtilsTest {
@Test
- public void testPfUtils() {
+ public void testCompareObjects() {
assertEquals(0, PfUtils.compareObjects(null, null));
assertEquals(-1, PfUtils.compareObjects("hello", null));
assertEquals(1, PfUtils.compareObjects(null, "hello"));
assertFalse(PfUtils.compareObjects("hello", "goodbye") == 0);
assertEquals(0, PfUtils.compareObjects("hello", "hello"));
}
+
+ @Test
+ public void testMapList() {
+ assertNull(PfUtils.mapList(null, item -> {
+ throw new RuntimeException("should not be invoked");
+ }));
+
+ List<String> origList = Arrays.asList("abc", "def");
+ List<String> newList = PfUtils.mapList(origList, text -> text + "X");
+
+ assertEquals(Arrays.asList("abcX", "defX"), newList);
+ }
}