opennlp.tools.formats.BioNLP2004NameSampleStream 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.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import opennlp.tools.namefind.NameSample;
import opennlp.tools.util.InputStreamFactory;
import opennlp.tools.util.ObjectStream;
import opennlp.tools.util.PlainTextByLineStream;
import opennlp.tools.util.Span;
import opennlp.tools.util.StringUtil;
/**
* Parser for the training files of the BioNLP/NLPBA 2004 shared task.
*
* The data contains five named entity types: DNA, RNA, protein, cell_type and cell_line.
*
* Data can be found on this web site:
* http://www-tsujii.is.s.u-tokyo.ac.jp/GENIA/ERtask/report.html
*
* Note: Do not use this class, internal use only!
*/
public class BioNLP2004NameSampleStream implements ObjectStream {
public static final int GENERATE_DNA_ENTITIES = 0x01;
public static final int GENERATE_PROTEIN_ENTITIES = 0x01 << 1;
public static final int GENERATE_CELLTYPE_ENTITIES = 0x01 << 2;
public static final int GENERATE_CELLLINE_ENTITIES = 0x01 << 3;
public static final int GENERATE_RNA_ENTITIES = 0x01 << 4;
private final int types;
private final ObjectStream lineStream;
public BioNLP2004NameSampleStream(InputStreamFactory in, int types) throws IOException {
try {
this.lineStream = new PlainTextByLineStream(in, StandardCharsets.UTF_8);
System.setOut(new PrintStream(System.out, true, "UTF-8"));
} catch (UnsupportedEncodingException e) {
// UTF-8 is available on all JVMs, will never happen
throw new IllegalStateException(e);
}
this.types = types;
}
public NameSample read() throws IOException {
List sentence = new ArrayList<>();
List tags = new ArrayList<>();
boolean isClearAdaptiveData = false;
// Empty line indicates end of sentence
String line;
while ((line = lineStream.read()) != null && !StringUtil.isEmpty(line.trim())) {
if (line.startsWith("###MEDLINE:")) {
isClearAdaptiveData = true;
lineStream.read();
continue;
}
if (line.contains("ABSTRACT TRUNCATED"))
continue;
String[] fields = line.split("\t");
if (fields.length == 2) {
sentence.add(fields[0]);
tags.add(fields[1]);
}
else {
throw new IOException("Expected two fields per line in training data, got " +
fields.length + " for line '" + line + "'!");
}
}
if (sentence.size() > 0) {
// convert name tags into spans
List names = new ArrayList<>();
int beginIndex = -1;
int endIndex = -1;
for (int i = 0; i < tags.size(); i++) {
String tag = tags.get(i);
if (tag.endsWith("DNA") && (types & GENERATE_DNA_ENTITIES) == 0)
tag = "O";
if (tag.endsWith("protein") && (types & GENERATE_PROTEIN_ENTITIES) == 0)
tag = "O";
if (tag.endsWith("cell_type") && (types & GENERATE_CELLTYPE_ENTITIES) == 0)
tag = "O";
if (tag.endsWith("cell_line") && (types & GENERATE_CELLTYPE_ENTITIES) == 0)
tag = "O";
if (tag.endsWith("RNA") && (types & GENERATE_RNA_ENTITIES) == 0)
tag = "O";
if (tag.startsWith("B-")) {
if (beginIndex != -1) {
names.add(new Span(beginIndex, endIndex, tags.get(beginIndex).substring(2)));
beginIndex = -1;
endIndex = -1;
}
beginIndex = i;
endIndex = i + 1;
}
else if (tag.startsWith("I-")) {
endIndex++;
}
else if (tag.equals("O")) {
if (beginIndex != -1) {
names.add(new Span(beginIndex, endIndex, tags.get(beginIndex).substring(2)));
beginIndex = -1;
endIndex = -1;
}
}
else {
throw new IOException("Invalid tag: " + tag);
}
}
// if one span remains, create it here
if (beginIndex != -1)
names.add(new Span(beginIndex, endIndex, tags.get(beginIndex).substring(2)));
return new NameSample(sentence.toArray(new String[sentence.size()]),
names.toArray(new Span[names.size()]), isClearAdaptiveData);
}
else if (line != null) {
// Just filter out empty events, if two lines in a row are empty
return read();
}
else {
// source stream is not returning anymore lines
return null;
}
}
public void reset() throws IOException, UnsupportedOperationException {
lineStream.reset();
}
public void close() throws IOException {
lineStream.close();
}
}