| /* |
| * 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.lucene.store; |
| |
| |
| import java.io.IOException; |
| import java.util.zip.CRC32; |
| import java.util.zip.Checksum; |
| |
| /** |
| * Simple implementation of {@link ChecksumIndexInput} that wraps |
| * another input and delegates calls. |
| */ |
| public class BufferedChecksumIndexInput extends ChecksumIndexInput { |
| final IndexInput main; |
| final Checksum digest; |
| |
| /** Creates a new BufferedChecksumIndexInput */ |
| public BufferedChecksumIndexInput(IndexInput main) { |
| super("BufferedChecksumIndexInput(" + main + ")"); |
| this.main = main; |
| this.digest = new BufferedChecksum(new CRC32()); |
| } |
| |
| @Override |
| public byte readByte() throws IOException { |
| final byte b = main.readByte(); |
| digest.update(b); |
| return b; |
| } |
| |
| @Override |
| public void readBytes(byte[] b, int offset, int len) |
| throws IOException { |
| main.readBytes(b, offset, len); |
| digest.update(b, offset, len); |
| } |
| |
| @Override |
| public long getChecksum() { |
| return digest.getValue(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| main.close(); |
| } |
| |
| @Override |
| public long getFilePointer() { |
| return main.getFilePointer(); |
| } |
| |
| @Override |
| public long length() { |
| return main.length(); |
| } |
| |
| @Override |
| public IndexInput clone() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public IndexInput slice(String sliceDescription, long offset, long length) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| } |