Java Array Truncate truncate(final byte[] arr, final int len)

Description

Returns a possibly truncated version of arr which is guaranteed to be exactly len elements long.

License

Open Source License

Declaration

public static byte[] truncate(final byte[] arr, final int len) throws IllegalArgumentException 

Method Source Code

//package com.java2s;
/*/*from   w w  w . j a  v  a2  s .  c om*/
 * Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except
 * in compliance with the License. A copy of the License is located at
 * 
 * http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file 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.
 */

import java.util.Arrays;

public class Main {
    /**
     * Returns a possibly truncated version of {@code arr} which is guaranteed to be exactly
     * {@code len} elements long. If {@code arr} is already exactly {@code len} elements long, then
     * {@code arr} is returned without copy or modification. If {@code arr} is longer than
     * {@code len}, then a truncated copy is returned. If {@code arr} is shorter than {@code len}
     * then this throws an {@link IllegalArgumentException}.
     */
    public static byte[] truncate(final byte[] arr, final int len) throws IllegalArgumentException {
        if (arr.length == len) {
            return arr;
        } else if (arr.length > len) {
            return Arrays.copyOf(arr, len);
        } else {
            throw new IllegalArgumentException("arr is not at least " + len + " elements long");
        }
    }
}

Related

1. truncate(byte[] array, int newLength)
2. truncate(byte[] element, int length)
3. truncate(byte[] nextPartBytes, int partSize)
4. truncate(int[] array, int maxLen)
5. truncate(int[] values, int value)
6. truncate(short[] value, int maxSize)
7. truncateAndConvertToInt(long[] longArray)