Add common CollectionUtils.{any,all} methods.

Test: new tests for this
Change-Id: I482c958af499bf8cdc8824c9586e9da619cd1f39

2 files changed, 76 insertions, 0 deletions

diff --git a/common/framework/com/android/net/module/util/CollectionUtils.java b/common/framework/com/android/net/module/util/CollectionUtils.java
index 74f738da..cb1e3e74 100644
--- a/common/framework/com/android/net/module/util/CollectionUtils.java
+++ b/common/framework/com/android/net/module/util/CollectionUtils.java
@@ -66,6 +66,28 @@ public final class CollectionUtils {
     }
 
     /**
+     * @return True if all elements satisfy the predicate, false otherwise.
+     *   Note that means this always returns true for empty collections.
+     */
+    public static <T> boolean all(@NonNull Collection<T> elem, @NonNull Predicate<T> predicate) {
+        for (final T e : elem) {
+            if (!predicate.test(e)) return false;
+        }
+        return true;
+
+    }
+    /**
+     * @return True if any element satisfies the predicate, false otherwise.
+     *   Note that means this always returns false for empty collections.
+     */
+    public static <T> boolean any(@NonNull Collection<T> elem, @NonNull Predicate<T> predicate) {
+        for (final T e : elem) {
+            if (predicate.test(e)) return true;
+        }
+        return false;
+    }
+
+    /**
      * @return True if there exists at least one element in the sparse array for which
      * condition {@code predicate}
      */
diff --git a/common/tests/unit/src/com/android/net/module/util/CollectionUtilsTest.kt b/common/tests/unit/src/com/android/net/module/util/CollectionUtilsTest.kt
new file mode 100644
index 00000000..00077420
--- /dev/null
+++ b/common/tests/unit/src/com/android/net/module/util/CollectionUtilsTest.kt
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * 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.android.net.module.util
+
+import androidx.test.filters.SmallTest
+import androidx.test.runner.AndroidJUnit4
+import org.junit.Test
+import org.junit.runner.RunWith
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+@RunWith(AndroidJUnit4::class)
+@SmallTest
+class CollectionUtilsTest {
+    @Test
+    fun testAny() {
+        assertTrue(CollectionUtils.any(listOf("A", "B", "C", "D", "E")) { it == "E" })
+        assertFalse(CollectionUtils.any(listOf("A", "B", "C", "D", "E")) { it == "F" })
+        assertTrue(CollectionUtils.any(listOf("AA", "BBB")) { it.length >= 3 })
+        assertFalse(CollectionUtils.any(listOf("A", "BB", "CCC")) { it.length >= 4 })
+        assertFalse(CollectionUtils.any(listOf("A", "BB", "CCC")) { it.length < 0 })
+        assertFalse(CollectionUtils.any(listOf<String>()) { true })
+        assertFalse(CollectionUtils.any(listOf<String>()) { false })
+        assertTrue(CollectionUtils.any(listOf("A")) { true })
+        assertFalse(CollectionUtils.any(listOf("A")) { false })
+    }
+
+    @Test
+    fun testAll() {
+        assertFalse(CollectionUtils.all(listOf("A", "B", "C", "D", "E")) { it != "E" })
+        assertTrue(CollectionUtils.all(listOf("A", "B", "C", "D", "E")) { it != "F" })
+        assertFalse(CollectionUtils.all(listOf("A", "BB", "CCC")) { it.length > 2 })
+        assertTrue(CollectionUtils.all(listOf("A", "BB", "CCC")) { it.length >= 1 })
+        assertTrue(CollectionUtils.all(listOf("A", "BB", "CCC")) { it.length < 4 })
+        assertTrue(CollectionUtils.all(listOf<String>()) { true })
+        assertTrue(CollectionUtils.all(listOf<String>()) { false })
+        assertTrue(CollectionUtils.all(listOf(1)) { true })
+        assertFalse(CollectionUtils.all(listOf(1)) { false })
+    }
+}