/*
* 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.doccat;
import java.util.Iterator;
import opennlp.model.Event;
import opennlp.tools.util.AbstractEventStream;
import opennlp.tools.util.ObjectStream;
/**
* Iterator-like class for modeling document classification events.
*/
public class DocumentCategorizerEventStream extends AbstractEventStream<DocumentSample> {
private DocumentCategorizerContextGenerator mContextGenerator;
/**
* Initializes the current instance.
*
* @param data {@link ObjectStream} of {@link DocumentSample}s
*
* @param featureGenerators
*/
public DocumentCategorizerEventStream(ObjectStream<DocumentSample> data, FeatureGenerator... featureGenerators) {
super(data);
mContextGenerator =
new DocumentCategorizerContextGenerator(featureGenerators);
}
/**
* Initializes the current instance.
*
* @param samples {@link ObjectStream} of {@link DocumentSample}s
*/
public DocumentCategorizerEventStream(ObjectStream<DocumentSample> samples) {
super(samples);
mContextGenerator =
new DocumentCategorizerContextGenerator(new BagOfWordsFeatureGenerator());
}
@Override
protected Iterator<Event> createEvents(final DocumentSample sample) {
return new Iterator<Event>(){
private boolean isVirgin = true;
public boolean hasNext() {
return isVirgin;
}
public Event next() {
isVirgin = false;
return new Event(sample.getCategory(),
mContextGenerator.getContext(sample.getText()));
}
public void remove() {
throw new UnsupportedOperationException();
}};
}
}