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/*
* Copyright (C) 2017 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.tvprovider.media.tv;
import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP_PREFIX;
import androidx.annotation.RestrictTo;
import java.util.Arrays;
/**
* Static utilities for collections
* @hide
*/
@RestrictTo(LIBRARY_GROUP_PREFIX)
public class CollectionUtils {
/**
* Returns an array with the arrays concatenated together.
*
* @see <a href="http://stackoverflow.com/a/784842/1122089">Stackoverflow answer</a> by
* <a href="http://stackoverflow.com/users/40342/joachim-sauer">Joachim Sauer</a>
*/
@SuppressWarnings("unchecked")
public static <T> T[] concatAll(T[] first, T[]... rest) {
int totalLength = first.length;
for (T[] array : rest) {
totalLength += array.length;
}
T[] result = Arrays.copyOf(first, totalLength);
int offset = first.length;
for (T[] array : rest) {
System.arraycopy(array, 0, result, offset, array.length);
offset += array.length;
}
return result;
}
private CollectionUtils() {
}
}