opennlp.tools.parser.ChunkSampleStream 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.parser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import opennlp.tools.chunker.ChunkSample;
import opennlp.tools.parser.chunking.Parser;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;
public class ChunkSampleStream extends FilterObjectStream {
/**
* Initializes a {@link ChunkSampleStream instance}.
*
* @param in A {@link ObjectStream stream} used as input.
*/
public ChunkSampleStream(ObjectStream in) {
super(in);
}
private static void getInitialChunks(Parse p, List ichunks) {
if (p.isPosTag()) {
ichunks.add(p);
}
else {
Parse[] kids = p.getChildren();
boolean allKidsAreTags = true;
for (Parse kid : kids) {
if (!kid.isPosTag()) {
allKidsAreTags = false;
break;
}
}
if (allKidsAreTags) {
ichunks.add(p);
}
else {
for (Parse kid : kids) {
getInitialChunks(kid, ichunks);
}
}
}
}
public static Parse[] getInitialChunks(Parse p) {
List chunks = new ArrayList<>();
getInitialChunks(p, chunks);
return chunks.toArray(new Parse[0]);
}
@Override
public ChunkSample read() throws IOException {
Parse parse = samples.read();
if (parse != null) {
Parse[] chunks = getInitialChunks(parse);
List toks = new ArrayList<>();
List tags = new ArrayList<>();
List preds = new ArrayList<>();
for (Parse c : chunks) {
if (c.isPosTag()) {
toks.add(c.getCoveredText());
tags.add(c.getType());
preds.add(Parser.OTHER);
} else {
boolean start = true;
String ctype = c.getType();
Parse[] kids = c.getChildren();
for (Parse tok : kids) {
toks.add(tok.getCoveredText());
tags.add(tok.getType());
if (start) {
preds.add(Parser.START + ctype);
start = false;
} else {
preds.add(Parser.CONT + ctype);
}
}
}
}
return new ChunkSample(toks.toArray(new String[0]),
tags.toArray(new String[0]),
preds.toArray(new String[0]));
}
else {
return null;
}
}
}