/**
* Copyright (C) 2013 Christian Kohlschütter (ckkohl79@gmail.com)
*
* 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.l3s.boilerpipe.estimators;
import de.l3s.boilerpipe.BoilerpipeExtractor;
import de.l3s.boilerpipe.document.TextDocumentStatistics;
import de.l3s.boilerpipe.extractors.ArticleExtractor;
import de.l3s.boilerpipe.extractors.DefaultExtractor;
/**
* Estimates the "goodness" of a {@link BoilerpipeExtractor} on a given document.
*
* @author Christian Kohlschütter
*/
public final class SimpleEstimator {
/**
* Returns the singleton instance of {@link de.l3s.boilerpipe.estimators.SimpleEstimator}
*/
public static final SimpleEstimator INSTANCE = new SimpleEstimator();
private SimpleEstimator() {
}
/**
* Given the statistics of the document before and after applying the {@link BoilerpipeExtractor},
* can we regard the extraction quality (too) low?
*
* Works well with {@link DefaultExtractor}, {@link ArticleExtractor} and others.
*
* @param dsBefore
* @param dsAfter
* @return true if low quality is to be expected.
*/
public boolean isLowQuality(final TextDocumentStatistics dsBefore, final TextDocumentStatistics dsAfter) {
if (dsBefore.getNumWords() < 90 || dsAfter.getNumWords() < 70) {
return true;
}
if (dsAfter.avgNumWords() < 25) {
return true;
}
return false;
}
}