LensFacingConverter.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.CameraSelector;
/**
* Helper class that defines certain enum-like methods for {@link CameraSelector.LensFacing}
*/
public class LensFacingConverter {
private LensFacingConverter() {
}
/**
* @return an array containing the constants of {@link CameraSelector.LensFacing} in the
* order they're declared.
*/
@NonNull
public static Integer[] values() {
return new Integer[]{CameraSelector.LENS_FACING_FRONT, CameraSelector.LENS_FACING_BACK};
}
/**
* Returns the {@link CameraSelector.LensFacing} constant for the specified name
*
* @param name The name of the {@link CameraSelector.LensFacing} to return
* @return The {@link CameraSelector.LensFacing} constant for the specified name
*/
@CameraSelector.LensFacing
public static int valueOf(@Nullable final String name) {
if (name == null) {
throw new NullPointerException("name cannot be null");
}
switch (name) {
case "FRONT":
return CameraSelector.LENS_FACING_FRONT;
case "BACK":
return CameraSelector.LENS_FACING_BACK;
default:
throw new IllegalArgumentException("Unknown len facing name " + name);
}
}
/**
* Returns the name of the {@link CameraSelector.LensFacing} constant, exactly as it is
* declared.
*
* @param lensFacing A {@link CameraSelector.LensFacing} constant
* @return The name of the {@link CameraSelector.LensFacing} constant.
*/
@NonNull
public static String nameOf(@CameraSelector.LensFacing final int lensFacing) {
switch (lensFacing) {
case CameraSelector.LENS_FACING_FRONT:
return "FRONT";
case CameraSelector.LENS_FACING_BACK:
return "BACK";
default:
throw new IllegalArgumentException("Unknown lens facing " + lensFacing);
}
}
}