Added iOS helpers for classification result containers

mediapipe/tasks/ios/components/containers/utils/BUILD

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+# Copyright 2023 The MediaPipe Authors. All Rights Reserved.
+#
+# 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(default_visibility = ["//mediapipe/tasks:internal"])
+
+licenses(["notice"])
+
+objc_library(
+    name = "MPPCategoryHelpers",
+    srcs = ["sources/MPPCategory+Helpers.mm"],
+    hdrs = ["sources/MPPCategory+Helpers.h"],
+     deps = [
+        "//mediapipe/tasks/ios/components/containers:MPPCategory",
+        "//mediapipe/framework/formats:classification_cc_proto",
+        "//mediapipe/tasks/ios/common/utils:NSStringHelpers",
+    ],
+)
+
+objc_library(
+    name = "MPPClassificationResultHelpers",
+    srcs = ["sources/MPPClassificationResult+Helpers.mm"],
+    hdrs = ["sources/MPPClassificationResult+Helpers.h"],
+    deps = [
+        "//mediapipe/tasks/ios/components/containers:MPPClassificationResult",
+        ":MPPCategoryHelpers",
+        "//mediapipe/tasks/ios/common/utils:NSStringHelpers",
+        "//mediapipe/tasks/cc/components/containers/proto:classifications_cc_proto",
+    ],
+)

mediapipe/tasks/ios/components/containers/utils/sources/MPPCategory+Helpers.h

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+// 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.
+
+#include "mediapipe/framework/formats/classification.pb.h"
+#import "mediapipe/tasks/ios/components/containers/sources/MPPCategory.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MPPCategory (Helpers)
+
++ (MPPCategory *)categoryWithProto:(const mediapipe::Classification &)classificationProto;
+
+@end
+
+NS_ASSUME_NONNULL_END

mediapipe/tasks/ios/components/containers/utils/sources/MPPCategory+Helpers.mm

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+// 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.
+
+#import "mediapipe/tasks/ios/components/containers/utils/sources/MPPCategory+Helpers.h"
+
+#import "mediapipe/tasks/ios/common/utils/sources/NSString+Helpers.h"
+
+namespace {
+using ClassificationProto = ::mediapipe::Classification;
+}
+
+@implementation MPPCategory (Helpers)
+
++ (MPPCategory *)categoryWithProto:(const ClassificationProto &)clasificationProto {
+  NSString *categoryName;
+  NSString *displayName;
+
+  if (clasificationProto.has_label()) {
+    categoryName = [NSString stringWithCppString:clasificationProto.label()];
+  }
+
+  if (clasificationProto.has_display_name()) {
+    displayName = [NSString stringWithCppString:clasificationProto.display_name()];
+  }
+
+  return [[MPPCategory alloc] initWithIndex:clasificationProto.index()
+                                      score:clasificationProto.score()
+                                      categoryName:categoryName
+                                displayName:displayName];
+}
+
+@end

mediapipe/tasks/ios/components/containers/utils/sources/MPPClassificationResult+Helpers.h

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+// 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.
+
+#include "mediapipe/tasks/cc/components/containers/proto/classifications.pb.h"
+#import "mediapipe/tasks/ios/components/containers/sources/MPPClassificationResult.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MPPClassifications (Helpers)
+
++ (MPPClassifications *)classificationsWithProto:
+    (const mediapipe::tasks::components::containers::proto::Classifications &)classificationsProto;
+
+@end
+
+@interface MPPClassificationResult (Helpers)
+
++ (MPPClassificationResult *)classificationResultWithProto:
+    (const mediapipe::tasks::components::containers::proto::ClassificationResult &)
+        classificationResultProto;
+
+@end
+
+NS_ASSUME_NONNULL_END

mediapipe/tasks/ios/components/containers/utils/sources/MPPClassificationResult+Helpers.mm

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+// 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.
+
+#import "mediapipe/tasks/ios/components/containers/utils/sources/MPPClassificationResult+Helpers.h"
+
+#import "mediapipe/tasks/ios/common/utils/sources/NSString+Helpers.h"
+#import "mediapipe/tasks/ios/components/containers/utils/sources/MPPCategory+Helpers.h"
+
+namespace {
+using ClassificationsProto = ::mediapipe::tasks::components::containers::proto::Classifications;
+using ClassificationResultProto =
+    ::mediapipe::tasks::components::containers::proto::ClassificationResult;
+}  // namespace
+
+@implementation MPPClassifications (Helpers)
+
++ (MPPClassifications *)classificationsWithProto:
+    (const ClassificationsProto &)classificationsProto {
+  NSMutableArray<MPPCategory *> *categories = [NSMutableArray arrayWithCapacity:(NSUInteger)classificationsProto.classification_list().classification_size()];
+  for (const auto &classification : classificationsProto.classification_list().classification()) {
+    [categories addObject:[MPPCategory categoryWithProto:classification]];
+  }
+
+  NSString *headName;
+  if (classificationsProto.has_head_name()) {
+    headName = [NSString stringWithCppString:classificationsProto.head_name()];
+  }
+
+  return [[MPPClassifications alloc] initWithHeadIndex:(NSInteger)classificationsProto.head_index()
+                                              headName:headName
+                                            categories:categories];
+}
+
+@end
+
+@implementation MPPClassificationResult (Helpers)
+
++ (MPPClassificationResult *)classificationResultWithProto:
+    (const ClassificationResultProto &)classificationResultProto {
+  NSMutableArray *classifications = [NSMutableArray arrayWithCapacity:(NSUInteger)classificationResultProto.classifications_size()];
+  for (const auto &classificationsProto : classificationResultProto.classifications()) {
+    [classifications addObject:[MPPClassifications classificationsWithProto:classificationsProto]];
+  }
+
+  NSInteger timestampMs;
+  if (classificationResultProto.has_timestamp_ms()) {
+    timestampMs = (NSInteger)classificationResultProto.timestamp_ms();
+  }
+  
+  return [[MPPClassificationResult alloc] initWithClassifications:classifications timestampMs:timestampMs];;
+}
+
+@end