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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.fop.layoutmgr;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.apache.fop.layoutmgr.Alternative.FittingStrategy;
/*
* Utility class used in {@link MultiSwitchLayoutManager}
* to handle the <i>best-fit</i> property value if specified in {@link MultiSwitch}
*/
public final class BestFitLayoutUtils {
private BestFitLayoutUtils() { }
static class BestFitPosition extends Position {
public List<ListElement> knuthList;
public BestFitPosition(LayoutManager lm) {
super(lm);
}
public List<Position> getPositionList() {
List<Position> positions = new LinkedList<Position>();
if (knuthList != null) {
SpaceResolver.performConditionalsNotification(knuthList, 0, knuthList.size() - 1, -1);
for (ListElement elem : knuthList) {
if (elem.getPosition() != null && elem.getLayoutManager() != null) {
positions.add(elem.getPosition());
}
}
}
return positions;
}
public void setKnuthList(List<ListElement> knuthList) {
this.knuthList = knuthList;
}
public List<ListElement> getKnuthList() {
return knuthList;
}
}
public static Alternative makeAlternative(List<ListElement> childList) {
// Add a zero penalty to make the SpaceResolver
// transform Space elements into Knuth glues.
childList.add(KnuthPenalty.DUMMY_ZERO_PENALTY);
SpaceResolver.resolveElementList(childList);
int contentLength = ElementListUtils.calcContentLength(childList);
return new Alternative(childList, contentLength);
}
public static List<ListElement> getKnuthList(LayoutManager lm,
List<List<ListElement>> childrenLists,
FittingStrategy strategy) {
List<ListElement> knuthList = new LinkedList<ListElement>();
Iterator<List<ListElement>> iter = childrenLists.iterator();
BestFitPenalty bestFitPenalty = new BestFitPenalty(strategy, new BestFitPosition(lm));
while (iter.hasNext()) {
List<ListElement> childList = iter.next();
bestFitPenalty.addAlternative(makeAlternative(childList));
}
// A penalty must always be preceded by a box
// to be considered as a valid breakpoint.
addKnuthPenalty(lm, knuthList, bestFitPenalty);
return knuthList;
}
public static void addKnuthPenalty(LayoutManager lm, List<ListElement> list,
KnuthPenalty bestFitPenalty) {
list.add(0, new KnuthBox(0, new Position(lm), false));
list.add(bestFitPenalty);
list.add(new KnuthBox(0, new Position(lm), false));
}
public static List<Position> getPositionList(LayoutManager lm, PositionIterator posIter) {
// "unwrap" the NonLeafPositions stored in parentIter
// and put them in a new list;
LinkedList<Position> positionList = new LinkedList<Position>();
Position pos;
while (posIter.hasNext()) {
pos = posIter.next();
if (pos instanceof BestFitPosition) {
positionList.addAll(((BestFitPosition) pos).getPositionList());
} else {
positionList.add(pos);
}
}
return positionList;
}
}
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