HBASE-10431 Rename com.google.protobuf.ZeroCopyLiteralByteString - delete ZeroCopyLiteralByteString
git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1562577 13f79535-47bb-0310-9956-ffa450edef68
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.protobuf; // This is a lie.
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/**
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* Helper class to extract byte arrays from {@link ByteString} without copy.
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* <p>
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* Without this protobufs would force us to copy every single byte array out
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* of the objects de-serialized from the wire (which already do one copy, on
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* top of the copies the JVM does to go from kernel buffer to C buffer and
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* from C buffer to JVM buffer).
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*
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* @since 0.96.1
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*/
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public final class ZeroCopyLiteralByteString extends LiteralByteString {
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// Gotten from AsyncHBase code base with permission.
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/** Private constructor so this class cannot be instantiated. */
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private ZeroCopyLiteralByteString() {
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super(null);
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throw new UnsupportedOperationException("Should never be here.");
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}
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/**
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* Wraps a byte array in a {@link ByteString} without copying it.
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*/
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public static ByteString wrap(final byte[] array) {
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return new LiteralByteString(array);
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}
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/**
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* Wraps a subset of a byte array in a {@link ByteString} without copying it.
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*/
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public static ByteString wrap(final byte[] array, int offset, int length) {
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return new BoundedByteString(array, offset, length);
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}
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// TODO:
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// ZeroCopyLiteralByteString.wrap(this.buf, 0, this.count);
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/**
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* Extracts the byte array from the given {@link ByteString} without copy.
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* @param buf A buffer from which to extract the array. This buffer must be
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* actually an instance of a {@code LiteralByteString}.
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*/
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public static byte[] zeroCopyGetBytes(final ByteString buf) {
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if (buf instanceof LiteralByteString) {
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return ((LiteralByteString) buf).bytes;
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}
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throw new UnsupportedOperationException("Need a LiteralByteString, got a "
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+ buf.getClass().getName());
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}
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}
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