SEL: Add support for Array/List contains

netflix-sel/src/main/java/com/netflix/sel/type/SelArray.java

@@ -159,6 +159,29 @@ public SelLong field(SelString field) {
     throw new UnsupportedOperationException(type() + " DO NOT support accessing field: " + field);
   }
 
+  @Override
+  public SelType call(String methodName, SelType[] args) {
+    if ("contains".equals(methodName) && args.length == 1) {
+      return contains(args[0]);
+    }
+    throw new UnsupportedOperationException(
+        type()
+            + " DO NOT support calling method: "
+            + methodName
+            + " with args: "
+            + Arrays.toString(args));
+  }
+
+  private SelBoolean contains(SelType element) {
+    for (SelType item : val) {
+      SelBoolean isEqual = (SelBoolean) item.binaryOps(SelOp.EQUAL, element);
+      if (isEqual.booleanVal()) {
+        return SelBoolean.of(true);
+      }
+    }
+    return SelBoolean.of(false);
+  }
+
   @Override
   public String toString() {
     return Arrays.toString(val);

netflix-sel/src/test/java/com/netflix/sel/type/SelArrayTest.java

@@ -83,4 +83,26 @@ public void field() {
   public void invalidField() {
     one.field(SelString.of("size"));
   }
+
+  @Test
+  public void testContainsTrue() {
+    SelBoolean result = (SelBoolean) one.call("contains", new SelType[] {SelString.of("foo")});
+    assertTrue(result.booleanVal());
+  }
+
+  @Test
+  public void testContainsFalse() {
+    SelBoolean result = (SelBoolean) one.call("contains", new SelType[] {SelString.of("baz")});
+    assertFalse(result.booleanVal());
+  }
+
+  @Test(expected = UnsupportedOperationException.class)
+  public void testContainsInvalidArgs() {
+    one.call("contains", new SelType[] {});
+  }
+
+  @Test(expected = UnsupportedOperationException.class)
+  public void testInvalidMethod() {
+    one.call("invalidMethod", new SelType[] {SelString.of("test")});
+  }
 }