undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/util/stream/GatherersScanTest.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2023, 2024, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.util.LinkedList;
+import java.util.List;
+import java.util.stream.Gatherers;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assumptions.*;
+
+/**
+ * @test
+ * @summary Tests the API and contract of Gatherers.scan
+ * @run junit GatherersScanTest
+ */
+
+public class GatherersScanTest {
+
+    record Config(int streamSize, boolean parallel) {
+        Stream<Integer> stream() {
+            var stream = Stream.iterate(1, i -> i + 1).limit(streamSize);
+            stream = parallel ? stream.parallel() : stream.sequential();
+            return stream;
+        }
+    }
+
+    static final Stream<Integer> sizes(){
+        return Stream.of(0,1,10,33,99,9999);
+    }
+
+    static final Stream<Config> sequentialAndParallel(int size) {
+        return Stream.of(false, true)
+                .map(parallel ->
+                        new Config(size, parallel));
+    }
+
+    static final Stream<Config> configurations() {
+        return sizes().flatMap(i -> sequentialAndParallel(i));
+    }
+
+    @Test
+    public void throwsNPEWhenStateSupplierIsNull() {
+        assertThrows(NullPointerException.class,
+                () -> Gatherers.<String, String>scan(null, (state, next) -> state));
+    }
+
+    @Test
+    public void throwsNPEWhenScannerFunctionIsNull() {
+        assertThrows(NullPointerException.class,
+                () -> Gatherers.<String, String>scan(() -> "", null));
+    }
+
+    @ParameterizedTest
+    @MethodSource("configurations")
+    public void behavesAsExpected(Config config) {
+        final List<Long> expectedResult;
+        if (config.streamSize() == 0) {
+            expectedResult = List.of();
+        } else {
+            expectedResult = config.stream()
+                .sequential()
+                .reduce(
+                        new LinkedList<Long>(),
+                        (acc, next) -> {
+                            acc.addLast((acc.isEmpty() ? 0L : acc.getLast()) + next);
+                            return acc;
+                        },
+                        (l, r) -> { throw new IllegalStateException(); }
+                );
+        }
+
+        final var result = config.stream()
+                .gather(Gatherers.scan(() -> 0L, (acc, next) -> acc + next))
+                .toList();
+
+        assertEquals(expectedResult, result);
+    }
+}