Helper.java
/*
* Copyright 2021 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.tiles.material;
import static androidx.wear.tiles.DimensionBuilders.dp;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.annotation.RestrictTo.Scope;
import androidx.wear.tiles.DeviceParametersBuilders;
import androidx.wear.tiles.DeviceParametersBuilders.DeviceParameters;
import androidx.wear.tiles.DimensionBuilders.DpProp;
/**
* Helper class used for Tiles Material.
*
* @hide
*/
@RestrictTo(Scope.LIBRARY_GROUP)
public class Helper {
private Helper() {}
/**
* Returns given value if not null or throws {@code NullPointerException} otherwise.
*/
@NonNull
public static <T> T checkNotNull(@Nullable T value) {
if (value == null) {
throw new NullPointerException();
}
return value;
}
/** Returns radius in {@link DpProp} of the given diameter. */
static DpProp radiusOf(DpProp diameter) {
return dp(diameter.getValue() / 2);
}
/**
* Returns true if the given DeviceParameters belong to the round screen device.
*/
public static boolean isRoundDevice(@NonNull DeviceParameters deviceParameters) {
return deviceParameters.getScreenShape() == DeviceParametersBuilders.SCREEN_SHAPE_ROUND;
}
}