From 7912a08dd16a5605baaa13f10baeb5efc2e264a0 Mon Sep 17 00:00:00 2001
From: Harald Musum <musum@verizonmedia.com>
Date: Thu, 16 Jul 2020 14:12:26 +0200
Subject: Revert "Reapply load platform bundles separately"

---
 .../java/com/yahoo/collections/PredicateSplit.java | 40 ++++++++++++++++++++++
 .../yahoo/collections/PredicateSplitTestCase.java  | 30 ++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 vespajlib/src/main/java/com/yahoo/collections/PredicateSplit.java
 create mode 100644 vespajlib/src/test/java/com/yahoo/collections/PredicateSplitTestCase.java

(limited to 'vespajlib')

diff --git a/vespajlib/src/main/java/com/yahoo/collections/PredicateSplit.java b/vespajlib/src/main/java/com/yahoo/collections/PredicateSplit.java
new file mode 100644
index 00000000000..1b3941df7bf
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/collections/PredicateSplit.java
@@ -0,0 +1,40 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.collections;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.function.Predicate;
+
+/**
+ * Class holding the result of a partition-by-predicate operation.
+ **/
+public class PredicateSplit<E> {
+    public final List<E> falseValues; /// list of values where the predicate returned false
+    public final List<E> trueValues;  /// list of values where the predicate returned true
+
+    private PredicateSplit() {
+	falseValues = new ArrayList<E>();
+	trueValues = new ArrayList<E>();
+    }
+
+    /**
+     * Perform a partition-by-predicate operation.
+     * Each value in the input is tested by the predicate and
+     * added to either the falseValues list or the trueValues list.
+     * @param collection The input collection.
+     * @param predicate A test for selecting the target list.
+     * @return Two lists bundled in an object.
+     **/
+    public static <V> PredicateSplit<V> partition(Iterable<V> collection, Predicate<? super V> predicate)
+    {
+        PredicateSplit<V> r = new PredicateSplit<V>();
+        for (V value : collection) {
+            if (predicate.test(value)) {
+                r.trueValues.add(value);
+            } else {
+                r.falseValues.add(value);
+            }
+        }
+        return r;
+    }
+}
diff --git a/vespajlib/src/test/java/com/yahoo/collections/PredicateSplitTestCase.java b/vespajlib/src/test/java/com/yahoo/collections/PredicateSplitTestCase.java
new file mode 100644
index 00000000000..05a719d6a4d
--- /dev/null
+++ b/vespajlib/src/test/java/com/yahoo/collections/PredicateSplitTestCase.java
@@ -0,0 +1,30 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.collections;
+
+import org.junit.Test;
+
+import java.util.List;
+import java.util.ArrayList;
+
+import static org.junit.Assert.assertEquals;
+
+public class PredicateSplitTestCase {
+    @Test
+    public void requireThatSplitWorks() {
+        List<Integer> l = new ArrayList<Integer>();
+        l.add(1);
+        l.add(6);
+        l.add(2);
+        l.add(4);
+        l.add(5);
+        PredicateSplit<Integer> result = PredicateSplit.partition(l, x -> (x % 2 == 0));
+        assertEquals((long) result.falseValues.size(), 2L);
+        assertEquals((long) result.falseValues.get(0), 1L);
+        assertEquals((long) result.falseValues.get(1), 5L);
+
+        assertEquals((long) result.trueValues.size(), 3L);
+        assertEquals((long) result.trueValues.get(0), 6L);
+        assertEquals((long) result.trueValues.get(1), 2L);
+        assertEquals((long) result.trueValues.get(2), 4L);
+    }
+}
-- 
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