1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one *
3 * or more contributor license agreements. See the NOTICE file *
4 * distributed with this work for additional information *
5 * regarding copyright ownership. The ASF licenses this file *
6 * to you under the Apache License, Version 2.0 (the *
7 * "License"); you may not use this file except in compliance *
8 * with the License. You may obtain a copy of the License at *
9 * *
10 * http://www.apache.org/licenses/LICENSE-2.0 *
11 * *
12 * Unless required by applicable law or agreed to in writing, *
13 * software distributed under the License is distributed on an *
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
15 * KIND, either express or implied. See the License for the *
16 * specific language governing permissions and limitations *
17 * under the License. *
18 */
19 package org.apache.rat.header;
20
21 import org.apache.rat.DeprecationReporter;
22
23 import java.io.IOException;
24 import java.io.Reader;
25 import java.nio.CharBuffer;
26 @Deprecated // since 0.17
27 @DeprecationReporter.Info(since = "0.17", forRemoval = true)
28 class FilteringSequenceFactory {
29
30 private static final int BUFFER_CAPACITY = 5000;
31
32 private final CharBuffer buffer;
33 private final CharFilter filter;
34
35 public FilteringSequenceFactory(final CharFilter filter) {
36 this(BUFFER_CAPACITY, filter);
37 }
38
39 public FilteringSequenceFactory(final int capacity, final CharFilter filter) {
40 DeprecationReporter.logDeprecated(this.getClass());
41 this.buffer = CharBuffer.allocate(capacity);
42 this.filter = filter;
43 }
44
45 public CharSequence filter(Reader reader) throws IOException {
46 return filter(new LineNumberReader(reader));
47 }
48
49 public CharSequence filter(LineNumberReader reader) throws IOException {
50 buffer.clear();
51 boolean eof = false;
52 while(!eof) {
53 final int next = reader.read();
54 if (next == -1 || !buffer.hasRemaining()) {
55 eof = true;
56 } else {
57 final char character = (char) next;
58 if (!filter.isFilteredOut(character))
59 {
60 buffer.put(character);
61 }
62 }
63 }
64 buffer.limit(buffer.position()).rewind();
65 return buffer;
66 }
67 }