com.google.protobuf

Class ZeroByteStringHelper

java.lang.Object

com.google.protobuf.ZeroByteStringHelper

public class ZeroByteStringHelper
extends Object

Byte string and byte buffer converter

Author:

boyan (boyan@alibaba-inc.com) 2018-May-08 2:38:42 PM

Constructor Summary

Constructors

Constructor and Description
ZeroByteStringHelper()

Method Summary

Modifier and Type	Method and Description
static com.google.protobuf.ByteString	concatenate(com.google.protobuf.ByteString left, com.google.protobuf.ByteString right) Concatenate the given strings while performing various optimizations to slow the growth rate of tree depth and tree node count.
static com.google.protobuf.ByteString	concatenate(List<ByteBuffer> byteBuffers)
static byte[]	getByteArray(com.google.protobuf.ByteString byteString) Carry the byte[] from ByteString, if failed, then call ByteString.toByteArray().
static com.google.protobuf.ByteString	wrap(byte[] bs) Wrap a byte array into a ByteString.
static com.google.protobuf.ByteString	wrap(byte[] bs, int offset, int len) Wrap a byte array into a ByteString.
static com.google.protobuf.ByteString	wrap(ByteBuffer buf) Wrap a byte buffer into a ByteString.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ZeroByteStringHelper

public ZeroByteStringHelper()

Method Detail

wrap

public static com.google.protobuf.ByteString wrap(byte[] bs)

Wrap a byte array into a ByteString.

wrap

public static com.google.protobuf.ByteString wrap(byte[] bs,
                                                  int offset,
                                                  int len)

Wrap a byte array into a ByteString.

Parameters:

bs - the byte array

offset - read start offset in array

len - read data length

Returns:

the result byte string.

wrap

public static com.google.protobuf.ByteString wrap(ByteBuffer buf)

Wrap a byte buffer into a ByteString.

getByteArray

public static byte[] getByteArray(com.google.protobuf.ByteString byteString)

Carry the byte[] from ByteString, if failed, then call ByteString.toByteArray().

Parameters:

byteString - the byteString source data

Returns:

carried bytes

concatenate

public static com.google.protobuf.ByteString concatenate(com.google.protobuf.ByteString left,
                                                         com.google.protobuf.ByteString right)

Concatenate the given strings while performing various optimizations to slow the growth rate of tree depth and tree node count. The result is either a ByteString.LeafByteString or a RopeByteString depending on which optimizations, if any, were applied.

Small pieces of length less than ByteString.CONCATENATE_BY_COPY_SIZE may be copied by value here, as in BAP95. Large pieces are referenced without copy.

Most of the operation here is inspired by the now-famous paper

Parameters:

left - string on the left

right - string on the right

Returns:

concatenation representing the same sequence as the given strings

concatenate

public static com.google.protobuf.ByteString concatenate(List<ByteBuffer> byteBuffers)

See Also:

concatenate(ByteString, ByteString)