de.tu.darmstadt.lt.ner.feature.extractor.CamelCaseFeatureExtractor.java Source code

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Here is the source code for de.tu.darmstadt.lt.ner.feature.extractor.CamelCaseFeatureExtractor.java

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/*******************************************************************************
 * Copyright 2014
 * FG Language Technology
 * Technische Universitt Darmstadt
 *
 * 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 de.tu.darmstadt.lt.ner.feature.extractor;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

import org.apache.commons.lang.StringUtils;
import org.cleartk.ml.Feature;
import org.cleartk.ml.feature.function.FeatureFunction;

public class CamelCaseFeatureExtractor implements FeatureFunction {

    public CamelCaseFeatureExtractor() throws IOException {
        // read
    }

    public static final String DEFAULT_NAME = "CamelCase";

    @Override
    public List<Feature> apply(Feature feature) {

        Object featureValue = feature.getValue();

        if (featureValue == null) {
            return Collections.singletonList(new Feature("CapsFeature", "CapsFeature_null"));
        }

        String value = featureValue.toString();
        if (value == null || value.length() == 0) {
            return Collections.singletonList(new Feature("CapsFeature", "CapsFeature_null"));
        }

        if (StringUtils.isAllUpperCase(value)) {
            return Collections
                    .singletonList(new Feature("CapsFeature", StringUtils.capitalize(value.toLowerCase())));
        } else {
            return Collections.singletonList(new Feature("CapsFeature", value));
        }

    }
}