| /* |
| * 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.rat.header; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.nio.CharBuffer; |
| |
| class FilteringSequenceFactory { |
| |
| private static final int BUFFER_CAPACITY = 5000; |
| |
| private final CharBuffer buffer; |
| private final CharFilter filter; |
| |
| public FilteringSequenceFactory(final CharFilter filter) { |
| this(BUFFER_CAPACITY, filter); |
| } |
| |
| public FilteringSequenceFactory(final int capacity, final CharFilter filter) { |
| this.buffer = CharBuffer.allocate(capacity); |
| this.filter = filter; |
| } |
| |
| public CharSequence filter(Reader reader) throws IOException { |
| return filter(new LineNumberReader(reader)); |
| } |
| |
| public CharSequence filter(LineNumberReader reader) throws IOException { |
| buffer.clear(); |
| boolean eof = false; |
| while(!eof) { |
| final int next = reader.read(); |
| if (next == -1 || !buffer.hasRemaining()) { |
| eof = true; |
| } else { |
| final char character = (char) next; |
| if (!filter.isFilteredOut(character)) |
| { |
| buffer.put(character); |
| } |
| } |
| } |
| buffer.limit(buffer.position()).rewind(); |
| return buffer; |
| } |
| } |