| /** |
| * 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.hadoop.io.erasurecode; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * A wrapper for ByteBuffer or bytes array for an erasure code chunk. |
| */ |
| public class ECChunk { |
| |
| private ByteBuffer chunkBuffer; |
| |
| /** |
| * Wrapping a ByteBuffer |
| * @param buffer buffer to be wrapped by the chunk |
| */ |
| public ECChunk(ByteBuffer buffer) { |
| this.chunkBuffer = buffer; |
| } |
| |
| /** |
| * Wrapping a bytes array |
| * @param buffer buffer to be wrapped by the chunk |
| */ |
| public ECChunk(byte[] buffer) { |
| this.chunkBuffer = ByteBuffer.wrap(buffer); |
| } |
| |
| /** |
| * Convert to ByteBuffer |
| * @return ByteBuffer |
| */ |
| public ByteBuffer getBuffer() { |
| return chunkBuffer; |
| } |
| |
| /** |
| * Convert an array of this chunks to an array of ByteBuffers |
| * @param chunks chunks to convert into buffers |
| * @return an array of ByteBuffers |
| */ |
| public static ByteBuffer[] toBuffers(ECChunk[] chunks) { |
| ByteBuffer[] buffers = new ByteBuffer[chunks.length]; |
| |
| ECChunk chunk; |
| for (int i = 0; i < chunks.length; i++) { |
| chunk = chunks[i]; |
| if (chunk == null) { |
| buffers[i] = null; |
| } else { |
| buffers[i] = chunk.getBuffer(); |
| } |
| } |
| |
| return buffers; |
| } |
| |
| /** |
| * Convert to a bytes array, just for test usage. |
| * @return bytes array |
| */ |
| public byte[] toBytesArray() { |
| byte[] bytesArr = new byte[chunkBuffer.remaining()]; |
| // Avoid affecting the original one |
| chunkBuffer.mark(); |
| chunkBuffer.get(bytesArr); |
| chunkBuffer.reset(); |
| |
| return bytesArr; |
| } |
| } |