ExtendableUseCaseConfigFactory.java
/*
* Copyright 2019 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.impl;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.camera.core.CameraInfo;
import java.util.HashMap;
import java.util.Map;
/**
* A {@link UseCaseConfigFactory} that uses {@link ConfigProvider}s to provide configurations.
*/
public final class ExtendableUseCaseConfigFactory implements UseCaseConfigFactory {
private final Map<Class<?>, ConfigProvider<?>> mDefaultProviders = new HashMap<>();
/** Inserts or overrides the {@link ConfigProvider} for the given config type. */
public <C extends Config> void installDefaultProvider(
@NonNull Class<C> configType, @NonNull ConfigProvider<C> defaultProvider) {
mDefaultProviders.put(configType, defaultProvider);
}
@Nullable
@Override
public <C extends UseCaseConfig<?>> C getConfig(@NonNull Class<C> configType,
@Nullable CameraInfo cameraInfo) {
@SuppressWarnings("unchecked") // Providers only could have been inserted with
// installDefaultProvider(), so the class should return the correct type.
ConfigProvider<C> provider = (ConfigProvider<C>) mDefaultProviders.get(configType);
if (provider != null) {
return provider.getConfig(cameraInfo);
}
return null;
}
}