/**
* 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.filters.heuristics;
import de.l3s.boilerpipe.BoilerpipeFilter;
import de.l3s.boilerpipe.BoilerpipeProcessingException;
import de.l3s.boilerpipe.document.TextBlock;
import de.l3s.boilerpipe.document.TextDocument;
import de.l3s.boilerpipe.labels.DefaultLabels;
/**
* Marks all {@link TextBlock}s "content" which are between the headline and the part that
* has already been marked content, if they are marked {@link de.l3s.boilerpipe.labels.DefaultLabels#MIGHT_BE_CONTENT}.
*
* This filter is quite specific to the news domain.
*
* @author Christian Kohlschütter
*/
public final class ExpandTitleToContentFilter implements BoilerpipeFilter {
public static final ExpandTitleToContentFilter INSTANCE = new ExpandTitleToContentFilter();
/**
* Returns the singleton instance for ExpandTitleToContentFilter.
*/
public static ExpandTitleToContentFilter getInstance() {
return INSTANCE;
}
public boolean process(TextDocument doc)
throws BoilerpipeProcessingException {
int i = 0;
int title = -1;
int contentStart = -1;
for (TextBlock tb : doc.getTextBlocks()) {
if (contentStart == -1 && tb.hasLabel(DefaultLabels.TITLE)) {
title = i;
contentStart = -1;
}
if (contentStart == -1 && tb.isContent()) {
contentStart = i;
}
i++;
}
if (contentStart <= title || title == -1) {
return false;
}
boolean changes = false;
for (TextBlock tb : doc.getTextBlocks().subList(title, contentStart)) {
if (tb.hasLabel(DefaultLabels.MIGHT_BE_CONTENT)) {
changes = tb.setIsContent(true) | changes;
}
}
return changes;
}
}