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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.spark.unsafe.types;
import org.apache.spark.unsafe.Platform;
import java.util.Arrays;
public final class ByteArray {
public static final byte[] EMPTY_BYTE = new byte[0];
/**
* Writes the content of a byte array into a memory address, identified by an object and an
* offset. The target memory address must already been allocated, and have enough space to
* hold all the bytes in this string.
*/
public static void writeToMemory(byte[] src, Object target, long targetOffset) {
Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET, target, targetOffset, src.length);
}
/**
* Returns a 64-bit integer that can be used as the prefix used in sorting.
*/
public static long getPrefix(byte[] bytes) {
if (bytes == null) {
return 0L;
} else {
final int minLen = Math.min(bytes.length, 8);
long p = 0;
for (int i = 0; i < minLen; ++i) {
p |= (128L + Platform.getByte(bytes, Platform.BYTE_ARRAY_OFFSET + i))
<< (56 - 8 * i);
}
return p;
}
}
public static byte[] subStringSQL(byte[] bytes, int pos, int len) {
// This pos calculation is according to UTF8String#subStringSQL
if (pos > bytes.length) {
return EMPTY_BYTE;
}
int start = 0;
int end;
if (pos > 0) {
start = pos - 1;
} else if (pos < 0) {
start = bytes.length + pos;
}
if ((bytes.length - start) < len) {
end = bytes.length;
} else {
end = start + len;
}
start = Math.max(start, 0); // underflow
if (start >= end) {
return EMPTY_BYTE;
}
return Arrays.copyOfRange(bytes, start, end);
}
}
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