LensFacingCameraFilter.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.experimental.UseExperimental;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraFilter;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ExperimentalCameraFilter;
import androidx.core.util.Preconditions;
import java.util.LinkedHashSet;
/**
* A filter that filters camera based on lens facing.
*/
@UseExperimental(markerClass = ExperimentalCameraFilter.class)
public class LensFacingCameraFilter implements CameraFilter {
@CameraSelector.LensFacing
private int mLensFacing;
public LensFacingCameraFilter(@CameraSelector.LensFacing int lensFacing) {
mLensFacing = lensFacing;
}
@NonNull
@Override
public LinkedHashSet<Camera> filter(@NonNull LinkedHashSet<Camera> cameras) {
LinkedHashSet<Camera> resultCameras = new LinkedHashSet<>();
for (Camera camera : cameras) {
Preconditions.checkState(camera instanceof CameraInternal,
"The camera doesn't contain internal implementation.");
Integer lensFacing = ((CameraInternal) camera).getCameraInfoInternal().getLensFacing();
if (lensFacing != null && lensFacing == mLensFacing) {
resultCameras.add(camera);
}
}
return resultCameras;
}
/** Returns the lens facing associated with this lens facing camera id filter. */
@CameraSelector.LensFacing
public int getLensFacing() {
return mLensFacing;
}
}