/**
* 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.Iterator;
import java.util.List;
import de.l3s.boilerpipe.BoilerpipeFilter;
import de.l3s.boilerpipe.BoilerpipeProcessingException;
import de.l3s.boilerpipe.document.TextBlock;
import de.l3s.boilerpipe.document.TextDocument;
/**
* Merges two subsequent blocks if their text densities are equal.
*
* @author Christian Kohlschütter
*/
public class SimpleBlockFusionProcessor implements BoilerpipeFilter {
public static final SimpleBlockFusionProcessor INSTANCE = new SimpleBlockFusionProcessor();
/**
* Returns the singleton instance for BlockFusionProcessor.
*/
public static SimpleBlockFusionProcessor getInstance() {
return INSTANCE;
}
public boolean process(TextDocument doc)
throws BoilerpipeProcessingException {
List<TextBlock> textBlocks = doc.getTextBlocks();
boolean changes = false;
if (textBlocks.size() < 2) {
return false;
}
TextBlock b1 = textBlocks.get(0);
for (Iterator<TextBlock> it = textBlocks.listIterator(1); it.hasNext();) {
TextBlock b2 = it.next();
final boolean similar = (b1.getTextDensity() == b2.getTextDensity());
if(similar) {
b1.mergeNext(b2);
it.remove();
changes = true;
} else {
b1 = b2;
}
}
return changes;
}
}