1 package org.apache.lucene.store;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 import java.io.IOException;
21 import java.util.zip.CRC32;
22 import java.util.zip.Checksum;
24 /** Writes bytes through to a primary IndexOutput, computing
25 * checksum as it goes. Note that you cannot use seek().
29 public class ChecksumIndexInput extends IndexInput {
33 public ChecksumIndexInput(IndexInput main) {
34 super("ChecksumIndexInput(" + main + ")");
40 public byte readByte() throws IOException {
41 final byte b = main.readByte();
47 public void readBytes(byte[] b, int offset, int len)
49 main.readBytes(b, offset, len);
50 digest.update(b, offset, len);
54 public long getChecksum() {
55 return digest.getValue();
59 public void close() throws IOException {
64 public long getFilePointer() {
65 return main.getFilePointer();
69 public void seek(long pos) {
70 throw new RuntimeException("not allowed");
74 public long length() {