| /* |
| * Copyright 2022 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 androidx.wear.protolayout.expression.pipeline; |
| |
| import androidx.annotation.NonNull; |
| |
| import java.util.function.Function; |
| |
| /** |
| * Dynamic data node that can perform a transformation from an upstream node. This should be created |
| * by passing a {@link Function} in, which implements the transformation |
| * |
| * @param <I> The source data type of this node. |
| * @param <O> The data type that this node emits. |
| */ |
| class DynamicDataTransformNode<I, O> implements DynamicDataNode<O> { |
| private final DynamicTypeValueReceiverWithPreUpdate<I> mCallback; |
| |
| final DynamicTypeValueReceiverWithPreUpdate<O> mDownstream; |
| final Function<I, O> mTransformer; |
| |
| DynamicDataTransformNode( |
| DynamicTypeValueReceiverWithPreUpdate<O> downstream, |
| Function<I, O> transformer) { |
| this.mDownstream = downstream; |
| this.mTransformer = transformer; |
| |
| mCallback = |
| new DynamicTypeValueReceiverWithPreUpdate<I>() { |
| @Override |
| public void onPreUpdate() { |
| // Don't need to do anything here; just relay. |
| mDownstream.onPreUpdate(); |
| } |
| |
| @Override |
| public void onData(@NonNull I newData) { |
| O result = mTransformer.apply(newData); |
| mDownstream.onData(result); |
| } |
| |
| @Override |
| public void onInvalidated() { |
| mDownstream.onInvalidated(); |
| } |
| }; |
| } |
| |
| public DynamicTypeValueReceiverWithPreUpdate<I> getIncomingCallback() { |
| return mCallback; |
| } |
| } |
