Edge.java
/*
* 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.camera.core.processing;
import static kotlin.jvm.internal.Intrinsics.checkNotNull;
import android.view.Surface;
import androidx.annotation.NonNull;
import androidx.core.util.Consumer;
/**
* A {@link Consumer} that can be listened to by another {@link Consumer}.
*
* <p>This is a publisher/subscriber mechanism that follows the pattern of the {@link Surface}
* API, where the upstream pipeline publishes data to the class by calling {@link #accept}, which
* will be automatically sent to the downstream pipeline registered via {@link #setListener}.
*
* @param <T> the data type.
*/
public class Edge<T> implements Consumer<T> {
private Consumer<T> mListener;
@Override
public void accept(@NonNull T t) {
checkNotNull(mListener, "Listener is not set.");
mListener.accept(t);
}
/**
* Sets a listener that will get data updates.
*/
public void setListener(@NonNull Consumer<T> listener) {
mListener = listener;
}
}