opennlp.tools.formats.TwentyNewsgroupSampleStream Maven / Gradle / Ivy
/*
* 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 opennlp.tools.formats;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import opennlp.tools.doccat.DocumentSample;
import opennlp.tools.tokenize.Tokenizer;
import opennlp.tools.util.ObjectStream;
public class TwentyNewsgroupSampleStream implements ObjectStream {
private final Tokenizer tokenizer;
private final Map catFileMap = new HashMap<>();
private Iterator> catFileTupleIterator;
TwentyNewsgroupSampleStream(Tokenizer tokenizer, Path dataDir) throws IOException {
this.tokenizer = tokenizer;
for (Path dir : Files.newDirectoryStream(dataDir, Files::isDirectory)) {
for (Path file : Files.newDirectoryStream(dir)) {
catFileMap.put(file, dir.getFileName().toString());
}
}
reset();
}
@Override
public DocumentSample read() throws IOException {
if (catFileTupleIterator.hasNext()) {
Map.Entry catFileTuple = catFileTupleIterator.next();
String text = new String(Files.readAllBytes(catFileTuple.getKey()));
return new DocumentSample(catFileTuple.getValue(), tokenizer.tokenize(text));
}
return null;
}
@Override
public void reset() throws IOException, UnsupportedOperationException {
catFileTupleIterator = catFileMap.entrySet().iterator();
}
}