/*
* Copyright 2015-2016 the original author or authors.
*
* 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 org.springframework.data.redis.util;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.util.Assert;
/**
* Some handy methods for dealing with byte arrays.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 1.7
*/
public final class ByteUtils {
private ByteUtils() {}
public static byte[] concat(byte[] arg1, byte[] arg2) {
byte[] result = Arrays.copyOf(arg1, arg1.length + arg2.length);
System.arraycopy(arg2, 0, result, arg1.length, arg2.length);
return result;
}
public static byte[] concatAll(byte[]... args) {
if (args.length == 0) {
return new byte[] {};
}
if (args.length == 1) {
return args[0];
}
byte[] cur = concat(args[0], args[1]);
for (int i = 2; i < args.length; i++) {
cur = concat(cur, args[i]);
}
return cur;
}
public static byte[][] split(byte[] source, int c) {
if (source == null || source.length == 0) {
return new byte[][] {};
}
List<byte[]> bytes = new ArrayList<byte[]>();
int offset = 0;
for (int i = 0; i <= source.length; i++) {
if (i == source.length) {
bytes.add(Arrays.copyOfRange(source, offset, i));
break;
}
if (source[i] == c) {
bytes.add(Arrays.copyOfRange(source, offset, i));
offset = i + 1;
}
}
return bytes.toArray(new byte[bytes.size()][]);
}
/**
* Merge multiple {@code byte} arrays into one array
*
* @param firstArray must not be {@literal null}
* @param additionalArrays must not be {@literal null}
* @return
*/
public static byte[][] mergeArrays(byte[] firstArray, byte[]... additionalArrays) {
Assert.notNull(firstArray, "first array must not be null");
Assert.notNull(additionalArrays, "additional arrays must not be null");
byte[][] result = new byte[additionalArrays.length + 1][];
result[0] = firstArray;
System.arraycopy(additionalArrays, 0, result, 1, additionalArrays.length);
return result;
}
/**
* Extract a byte array from {@link ByteBuffer} without consuming it.
*
* @param byteBuffer must not be {@literal null}.
* @return
* @since 2.0
*/
public static byte[] getBytes(ByteBuffer byteBuffer) {
Assert.notNull(byteBuffer, "ByteBuffer must not be null!");
ByteBuffer duplicate = byteBuffer.duplicate();
byte[] bytes = new byte[duplicate.remaining()];
duplicate.get(bytes);
return bytes;
}
}