/**
* 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.mahout.text;
import com.google.common.io.Closeables;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.mahout.common.iterator.FileLineIterable;
import org.apache.mahout.utils.io.ChunkedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Map;
/**
* Default parser for parsing text into sequence files.
*/
public final class PrefixAdditionFilter extends SequenceFilesFromDirectoryFilter {
public PrefixAdditionFilter(Configuration conf,
String keyPrefix,
Map<String, String> options,
ChunkedWriter writer,
Charset charset,
FileSystem fs) {
super(conf, keyPrefix, options, writer, charset, fs);
}
@Override
protected void process(FileStatus fst, Path current) throws IOException {
FileSystem fs = getFs();
ChunkedWriter writer = getWriter();
if (fst.isDir()) {
String dirPath = getPrefix() + Path.SEPARATOR + current.getName() + Path.SEPARATOR + fst.getPath().getName();
fs.listStatus(fst.getPath(),
new PrefixAdditionFilter(getConf(), dirPath, getOptions(), writer, getCharset(), fs));
} else {
InputStream in = null;
try {
in = fs.open(fst.getPath());
StringBuilder file = new StringBuilder();
for (String aFit : new FileLineIterable(in, getCharset(), false)) {
file.append(aFit).append('\n');
}
String name = current.getName().equals(fst.getPath().getName())
? current.getName()
: current.getName() + Path.SEPARATOR + fst.getPath().getName();
writer.write(getPrefix() + Path.SEPARATOR + name, file.toString());
} finally {
Closeables.close(in, false);
}
}
}
}