/**
* 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 java.util.List;
import java.util.ListIterator;
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;
public final class ContentFusion implements BoilerpipeFilter {
public static final ContentFusion INSTANCE = new ContentFusion();
/**
* Creates a new {@link de.l3s.boilerpipe.filters.heuristics.ContentFusion} instance.
*
*/
public ContentFusion() {
}
public boolean process(TextDocument doc)
throws BoilerpipeProcessingException {
List<TextBlock> textBlocks = doc.getTextBlocks();
if (textBlocks.size() < 2) {
return false;
}
TextBlock prevBlock = textBlocks.get(0);
boolean changes = false;
do {
changes = false;
for (ListIterator<TextBlock> it = textBlocks.listIterator(1); it
.hasNext();) {
TextBlock block = it.next();
if (prevBlock.isContent()
&& block.getLinkDensity() < 0.56
&& !block.hasLabel(DefaultLabels.STRICTLY_NOT_CONTENT)) {
prevBlock.mergeNext(block);
it.remove();
changes = true;
} else {
prevBlock = block;
}
}
} while (changes);
return true;
}
}