org.apache.fop.layoutmgr.KnuthPossPosIter Maven / Gradle / Ivy
/*
* 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.
*/
/* $Id: KnuthPossPosIter.java 1067353 2011-02-05 00:13:18Z adelmelle $ */
package org.apache.fop.layoutmgr;
import java.util.List;
/**
* A dedicated {@link PositionIterator} that is backed by an iterator
* over a list of {@link KnuthElement}s.
*/
public class KnuthPossPosIter extends PositionIterator {
private int iterCount;
/**
* Main constructor
* @param elementList List of Knuth elements
* @param startPos starting position, inclusive
* @param endPos ending position, exclusive
*/
public KnuthPossPosIter(List elementList, int startPos, int endPos) {
super(elementList.listIterator(startPos));
iterCount = endPos - startPos;
}
/**
* Auxiliary constructor
* @param elementList List of Knuth elements
*/
public KnuthPossPosIter(List elementList) {
this(elementList, 0, elementList.size());
}
// Check position < endPos
/** {@inheritDoc} */
@Override
protected boolean checkNext() {
if (iterCount > 0) {
return super.checkNext();
} else {
endIter();
return false;
}
}
/** {@inheritDoc} */
@Override
public Position next() {
--iterCount;
return super.next();
}
/**
* Peek at next, returning as ListElement.
* @return peek at next as ListElement
*/
public ListElement getKE() {
return (ListElement) peekNext();
}
/** {@inheritDoc} */
@Override
protected LayoutManager getLM(Object nextObj) {
return ((ListElement) nextObj).getLayoutManager();
}
/** {@inheritDoc} */
@Override
protected Position getPos(Object nextObj) {
return ((ListElement) nextObj).getPosition();
}
}