ArraySetJvmUtil.java
/*
* Copyright 2022 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.collection;
import java.lang.reflect.Array;
class ArraySetJvmUtil {
private ArraySetJvmUtil() {
}
// Necessary to implement in Java to allow allocating a typed array without a callback for
// initialization. We also need to ignore the nullity of the type in order to null out the
// (n+1)'th item for behavior compatibility.
@SuppressWarnings("unchecked")
static <T> T[] resizeForToArray(T[] destination, int size) {
if (destination.length < size) {
return (T[]) Array.newInstance(destination.getClass().getComponentType(), size);
} else {
if (destination.length > size) {
destination[size] = null;
}
return destination;
}
}
}