/*
* 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<Parse, ChunkSample> {
public ChunkSampleStream(ObjectStream<Parse> in) {
super(in);
}
private static void getInitialChunks(Parse p, List<Parse> ichunks) {
if (p.isPosTag()) {
ichunks.add(p);
}
else {
Parse[] kids = p.getChildren();
boolean allKidsAreTags = true;
for (int ci = 0, cl = kids.length; ci < cl; ci++) {
if (!kids[ci].isPosTag()) {
allKidsAreTags = false;
break;
}
}
if (allKidsAreTags) {
ichunks.add(p);
}
else {
for (int ci = 0, cl = kids.length; ci < cl; ci++) {
getInitialChunks(kids[ci], ichunks);
}
}
}
}
public static Parse[] getInitialChunks(Parse p) {
List<Parse> chunks = new ArrayList<Parse>();
getInitialChunks(p, chunks);
return chunks.toArray(new Parse[chunks.size()]);
}
public ChunkSample read() throws IOException {
Parse parse = samples.read();
if (parse != null) {
Parse[] chunks = getInitialChunks(parse);
List<String> toks = new ArrayList<String>();
List<String> tags = new ArrayList<String>();
List<String> preds = new ArrayList<String>();
for (int ci = 0, cl = chunks.length; ci < cl; ci++) {
Parse c = chunks[ci];
if (c.isPosTag()) {
toks.add(c.toString());
tags.add(c.getType());
preds.add(Parser.OTHER);
}
else {
boolean start = true;
String ctype = c.getType();
Parse[] kids = c.getChildren();
for (int ti=0,tl=kids.length;ti<tl;ti++) {
Parse tok = kids[ti];
toks.add(tok.toString());
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[toks.size()]),
tags.toArray(new String[tags.size()]),
preds.toArray(new String[preds.size()]));
}
else {
return null;
}
}
}