| /* |
| * 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.tika.parser.txt; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.charset.Charset; |
| |
| import org.apache.tika.config.Field; |
| import org.apache.tika.detect.EncodingDetector; |
| import org.apache.tika.metadata.Metadata; |
| |
| public class UniversalEncodingDetector implements EncodingDetector { |
| |
| private static final int BUFSIZE = 1024; |
| |
| private static final int DEFAULT_MARK_LIMIT = 16 * BUFSIZE; |
| |
| private int markLimit = DEFAULT_MARK_LIMIT; |
| |
| public Charset detect(InputStream input, Metadata metadata) throws IOException { |
| if (input == null) { |
| return null; |
| } |
| |
| input.mark(markLimit); |
| try { |
| UniversalEncodingListener listener = new UniversalEncodingListener(metadata); |
| |
| byte[] b = new byte[BUFSIZE]; |
| int n = 0; |
| int m = input.read(b); |
| while (m != -1 && n < markLimit && !listener.isDone()) { |
| n += m; |
| listener.handleData(b, 0, m); |
| m = input.read(b, 0, Math.min(b.length, markLimit - n)); |
| } |
| |
| return listener.dataEnd(); |
| } catch (LinkageError e) { |
| return null; // juniversalchardet is not available |
| } finally { |
| input.reset(); |
| } |
| } |
| |
| public int getMarkLimit() { |
| return markLimit; |
| } |
| |
| /** |
| * How far into the stream to read for charset detection. |
| * Default is 8192. |
| * |
| * @param markLimit |
| */ |
| @Field |
| public void setMarkLimit(int markLimit) { |
| this.markLimit = markLimit; |
| } |
| } |