| package org.apache.lucene.store; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.io.IOException; |
| import java.util.zip.CRC32; |
| import java.util.zip.Checksum; |
| |
| /** Writes bytes through to a primary IndexOutput, computing |
| * checksum. |
| * |
| * @lucene.internal |
| */ |
| public class ChecksumIndexOutput extends IndexOutput { |
| IndexOutput main; |
| Checksum digest; |
| |
| public ChecksumIndexOutput(IndexOutput main) { |
| this.main = main; |
| digest = new CRC32(); |
| } |
| |
| @Override |
| public void writeByte(byte b) throws IOException { |
| digest.update(b); |
| main.writeByte(b); |
| } |
| |
| @Override |
| public void writeBytes(byte[] b, int offset, int length) throws IOException { |
| digest.update(b, offset, length); |
| main.writeBytes(b, offset, length); |
| } |
| |
| public long getChecksum() { |
| return digest.getValue(); |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| main.flush(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| main.close(); |
| } |
| |
| @Override |
| public long getFilePointer() { |
| return main.getFilePointer(); |
| } |
| |
| /** writes the checksum */ |
| public void finishCommit() throws IOException { |
| main.writeLong(getChecksum()); |
| } |
| |
| @Override |
| public long length() throws IOException { |
| return main.length(); |
| } |
| } |