From 1dea01aecc3ae30acf7698ac9eb5acf120712eb2 Mon Sep 17 00:00:00 2001
From: MediaPipe Team <mediapipe-team@google.com>
Date: Tue, 2 May 2023 22:55:12 -0700
Subject: [PATCH] Internal change

PiperOrigin-RevId: 528996603
---
 .../com/google/mediapipe/tasks/vision/BUILD   |   1 +
 .../HandLandmarksConnections.java             | 105 ++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 mediapipe/tasks/java/com/google/mediapipe/tasks/vision/handlandmarker/HandLandmarksConnections.java

diff --git a/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/BUILD b/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/BUILD
index c27da79c7..a2dbe351a 100644
--- a/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/BUILD
+++ b/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/BUILD
@@ -213,6 +213,7 @@ android_library(
         "handlandmarker/HandLandmark.java",
         "handlandmarker/HandLandmarker.java",
         "handlandmarker/HandLandmarkerResult.java",
+        "handlandmarker/HandLandmarksConnections.java",
     ],
     javacopts = [
         "-Xep:AndroidJdkLibsChecker:OFF",
diff --git a/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/handlandmarker/HandLandmarksConnections.java b/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/handlandmarker/HandLandmarksConnections.java
new file mode 100644
index 000000000..c60923840
--- /dev/null
+++ b/mediapipe/tasks/java/com/google/mediapipe/tasks/vision/handlandmarker/HandLandmarksConnections.java
@@ -0,0 +1,105 @@
+// Copyright 2023 The MediaPipe Authors.
+//
+// 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.google.mediapipe.tasks.vision.handlandmarker;
+
+import com.google.auto.value.AutoValue;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+/** Hand landmarks connection constants. */
+public final class HandLandmarksConnections {
+
+  /** Value class representing hand landmarks connection. */
+  @AutoValue
+  public abstract static class Connection {
+    static Connection create(int start, int end) {
+      return new AutoValue_HandLandmarksConnections_Connection(start, end);
+    }
+
+    public abstract int start();
+
+    public abstract int end();
+  }
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_PALM_CONNECTIONS =
+      Collections.unmodifiableSet(
+          new HashSet<>(
+              Arrays.asList(
+                  Connection.create(0, 1),
+                  Connection.create(0, 5),
+                  Connection.create(9, 13),
+                  Connection.create(13, 17),
+                  Connection.create(5, 9),
+                  Connection.create(0, 17))));
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_THUMB_CONNECTIONS =
+      Collections.unmodifiableSet(
+          new HashSet<>(
+              Arrays.asList(
+                  Connection.create(1, 2), Connection.create(2, 3), Connection.create(3, 4))));
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_INDEX_FINGER_CONNECTIONS =
+      Collections.unmodifiableSet(
+          new HashSet<>(
+              Arrays.asList(
+                  Connection.create(5, 6), Connection.create(6, 7), Connection.create(7, 8))));
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_MIDDLE_FINGER_CONNECTIONS =
+      Collections.unmodifiableSet(
+          new HashSet<>(
+              Arrays.asList(
+                  Connection.create(9, 10), Connection.create(10, 11), Connection.create(11, 12))));
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_RING_FINGER_CONNECTIONS =
+      Collections.unmodifiableSet(
+          new HashSet<>(
+              Arrays.asList(
+                  Connection.create(13, 14),
+                  Connection.create(14, 15),
+                  Connection.create(15, 16))));
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_PINKY_FINGER_CONNECTIONS =
+      Collections.unmodifiableSet(
+          new HashSet<>(
+              Arrays.asList(
+                  Connection.create(17, 18),
+                  Connection.create(18, 19),
+                  Connection.create(19, 20))));
+
+  @SuppressWarnings("ConstantCaseForConstants")
+  public static final Set<Connection> HAND_CONNECTIONS =
+      Collections.unmodifiableSet(
+          Stream.of(
+                  HAND_PALM_CONNECTIONS.stream(),
+                  HAND_THUMB_CONNECTIONS.stream(),
+                  HAND_INDEX_FINGER_CONNECTIONS.stream(),
+                  HAND_MIDDLE_FINGER_CONNECTIONS.stream(),
+                  HAND_RING_FINGER_CONNECTIONS.stream(),
+                  HAND_PINKY_FINGER_CONNECTIONS.stream())
+              .flatMap(i -> i)
+              .collect(Collectors.toSet()));
+
+  private HandLandmarksConnections() {}
+}