org.apache.tika.batch.fs.FSListCrawler Maven / Gradle / Ivy
package org.apache.tika.batch.fs;
/*
* 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.
*/
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.ArrayBlockingQueue;
import org.apache.tika.batch.FileResource;
import org.apache.tika.batch.FileResourceCrawler;
/**
* Class that "crawls" a list of files.
*/
public class FSListCrawler extends FileResourceCrawler {
private final BufferedReader reader;
private final Path root;
/**
*
* @param fileQueue
* @param numConsumers
* @param root
* @param list
* @param encoding
* @throws FileNotFoundException
* @throws UnsupportedEncodingException
* @deprecated
* @see #FSListCrawler(ArrayBlockingQueue, int, Path, Path, Charset)
*/
@Deprecated
public FSListCrawler(ArrayBlockingQueue fileQueue,
int numConsumers, File root, File list, String encoding)
throws FileNotFoundException, UnsupportedEncodingException {
super(fileQueue, numConsumers);
reader = new BufferedReader(new InputStreamReader(new FileInputStream(list), encoding));
this.root = Paths.get(root.toURI());
}
/**
* Constructor for a crawler that reads a list of files to process.
*
* The list should be paths relative to the root.
*
* @param fileQueue queue for batch
* @param numConsumers number of consumers
* @param root root input director
* @param list text file list (one file per line) of paths relative to
* the root for processing
* @param charset charset of the file
* @throws IOException
*/
public FSListCrawler(ArrayBlockingQueue fileQueue,
int numConsumers, Path root, Path list, Charset charset)
throws IOException {
super(fileQueue, numConsumers);
reader = Files.newBufferedReader(list, charset);
this.root = root;
}
public void start() throws InterruptedException {
String line = nextLine();
while (line != null) {
if (Thread.currentThread().isInterrupted()) {
throw new InterruptedException("file adder interrupted");
}
Path f = Paths.get(root.toString(), line);
if (! Files.exists(f)) {
logger.warn("File doesn't exist:"+f.toAbsolutePath());
line = nextLine();
continue;
}
if (Files.isDirectory(f)) {
logger.warn("File is a directory:"+f.toAbsolutePath());
line = nextLine();
continue;
}
tryToAdd(new FSFileResource(root, f));
line = nextLine();
}
}
private String nextLine() {
String line = null;
try {
line = reader.readLine();
} catch (IOException e) {
throw new RuntimeException(e);
}
return line;
}
}