CompareSizesByArea.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.camera.core.impl.utils;
import android.util.Size;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import java.util.Comparator;
/** Comparator based on area of the given {@link Size} objects. */
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public final class CompareSizesByArea implements Comparator<Size> {
private boolean mReverse = false;
/** Creates a comparator with standard total ordering. */
public CompareSizesByArea() {
this(false);
}
/** Creates a comparator which can reverse the total ordering. */
public CompareSizesByArea(boolean reverse) {
mReverse = reverse;
}
@Override
public int compare(@NonNull Size lhs, @NonNull Size rhs) {
// We cast here to ensure the multiplications won't overflow
int result =
Long.signum(
(long) lhs.getWidth() * lhs.getHeight()
- (long) rhs.getWidth() * rhs.getHeight());
if (mReverse) {
result *= -1;
}
return result;
}
}