io.learningbox.controller.APIController.java Source code

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Here is the source code for io.learningbox.controller.APIController.java

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/**
 * This software is licensed under the Apache License, version 2 ("ALv2"), quoted below.
 *
 * Copyright 2016 Gianluca Tomasino <http://www.gianlucatomasino.me>
 *
 * Licensed 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 io.learningbox.controller;

import io.learningbox.model.LearningSet;
import io.learningbox.service.LearningSetRepository;
import opennlp.tools.doccat.DoccatFactory;
import opennlp.tools.doccat.DoccatModel;
import opennlp.tools.doccat.DocumentCategorizerME;
import opennlp.tools.doccat.DocumentSample;
import opennlp.tools.util.ObjectStream;
import opennlp.tools.util.TrainingParameters;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.SortedMap;

@RestController
@RequestMapping("/api")
public class APIController {

    @Autowired
    private LearningSetRepository repository;

    @RequestMapping(value = "/categorize/{area}", method = RequestMethod.POST)
    public SortedMap<Double, Set<String>> categorize(@PathVariable final String area, @RequestBody String input)
            throws IOException {
        List<LearningSet> l = repository.findByArea(area);
        final Iterator<LearningSet> sets = l.iterator();

        ObjectStream<DocumentSample> stream = new ObjectStream<DocumentSample>() {

            @Override
            public DocumentSample read() throws IOException {
                if (sets.hasNext()) {
                    LearningSet s = sets.next();

                    return new DocumentSample(s.getCategory(), s.getText());
                }
                return null;
            }

            @Override
            public void reset() throws IOException, UnsupportedOperationException {
                throw new UnsupportedOperationException();
            }

            @Override
            public void close() throws IOException {
                //Do nothing
            }
        };

        TrainingParameters trainingParameters = TrainingParameters.defaultParams();
        trainingParameters.put(TrainingParameters.ITERATIONS_PARAM, Integer.toString(1000));
        trainingParameters.put(TrainingParameters.CUTOFF_PARAM, Integer.toString(1));

        DoccatModel model = DocumentCategorizerME.train("en", stream, trainingParameters, new DoccatFactory());
        DocumentCategorizerME myCategorizer = new DocumentCategorizerME(model);
        return myCategorizer.sortedScoreMap(input);
    }

}