opennlp.tools.formats.frenchtreebank.ConstitParseSampleStream 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.frenchtreebank;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.SAXException;
import opennlp.tools.parser.Parse;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;
public class ConstitParseSampleStream extends FilterObjectStream {
private SAXParser saxParser;
private List parses = new ArrayList<>();
protected ConstitParseSampleStream(ObjectStream samples) {
super(samples);
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
saxParser = factory.newSAXParser();
} catch (ParserConfigurationException | SAXException e) {
throw new IllegalStateException(e);
}
}
public Parse read() throws IOException {
if (parses.isEmpty()) {
byte[] xmlbytes = samples.read();
if (xmlbytes != null) {
List producedParses = new ArrayList<>();
try {
saxParser.parse(new ByteArrayInputStream(xmlbytes),
new ConstitDocumentHandler(producedParses));
} catch (SAXException e) {
//TODO update after Java6 upgrade
throw new IOException(e.getMessage(), e);
}
parses.addAll(producedParses);
}
}
if (parses.size() > 0) {
return parses.remove(0);
}
return null;
}
}