org.apache.hudi.common.util.collection.ArrayUtils Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.hudi.common.util.collection;
/**
* Operations on arrays, primitive arrays (like {@code int[]}) and
* primitive wrapper arrays (like {@code Integer[]}).
*
* This class tries to handle {@code null} input gracefully.
* An exception will not be thrown for a {@code null}
* array input. However, an Object array that contains a {@code null}
* element may throw an exception. Each method documents its behaviour.
*
* NOTE : Adapted from org.apache.commons.lang3.ArrayUtils
*/
public class ArrayUtils {
/**
* An empty immutable {@code long} array.
*/
public static final long[] EMPTY_LONG_ARRAY = new long[0];
// Long array converters
// ----------------------------------------------------------------------
/**
* Converts an array of object Longs to primitives.
*
* This method returns {@code null} for a {@code null} input array.
*
* @param array a {@code Long} array, may be {@code null}
* @return a {@code long} array, {@code null} if null array input
* @throws NullPointerException if array content is {@code null}
*/
public static long[] toPrimitive(Long[] array) {
if (array == null) {
return null;
} else if (array.length == 0) {
return EMPTY_LONG_ARRAY;
}
final long[] result = new long[array.length];
for (int i = 0; i < array.length; i++) {
result[i] = array[i].longValue();
}
return result;
}
}