org.apache.ctakes.temporal.ae.feature.TimeWordTypeExtractor.java Source code

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Here is the source code for org.apache.ctakes.temporal.ae.feature.TimeWordTypeExtractor.java

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/*
 * 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 org.apache.ctakes.temporal.ae.feature;

import java.io.IOException;
import java.net.URL;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.apache.uima.jcas.JCas;
import org.apache.uima.jcas.tcas.Annotation;
import org.apache.uima.resource.ResourceInitializationException;
import org.cleartk.ml.Feature;
import org.cleartk.ml.feature.extractor.CleartkExtractorException;
import org.cleartk.ml.feature.extractor.FeatureExtractor1;
import org.cleartk.timeml.util.TimeWordsExtractor;

import com.google.common.base.Charsets;
import com.google.common.collect.Maps;
import com.google.common.io.Resources;

public class TimeWordTypeExtractor<T extends Annotation> implements FeatureExtractor1<T> {

    private static final String FEATURE_NAME = "TimeWordType";

    private static final String LOOKUP_PATH = "/org/apache/ctakes/temporal/time_word_types.txt";

    private Map<String, String> wordTypes;

    public TimeWordTypeExtractor() throws ResourceInitializationException {
        this.wordTypes = Maps.newHashMap();
        URL url = TimeWordsExtractor.class.getResource(LOOKUP_PATH);
        try {
            for (String line : Resources.readLines(url, Charsets.US_ASCII)) {
                String[] typeAndWord = line.split("\\s+");
                if (typeAndWord.length != 2) {
                    throw new IllegalArgumentException("Expected '<type> <word>', found: " + line);
                }
                this.wordTypes.put(typeAndWord[1], typeAndWord[0]);
            }
        } catch (IOException e) {
            throw new ResourceInitializationException(e);
        }
    }

    @Override
    public List<Feature> extract(JCas view, Annotation focusAnnotation) throws CleartkExtractorException {
        String type = this.wordTypes.get(focusAnnotation.getCoveredText().toLowerCase());
        List<Feature> features;
        if (type == null) {
            features = Collections.emptyList();
        } else {
            features = Collections.singletonList(new Feature(FEATURE_NAME, type));
        }
        return features;
    }
}