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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.layoutmgr;
import org.apache.fop.fo.FObj;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
public class LMiter implements ListIterator {
private ListIterator baseIter;
private FObj curFO;
protected List listLMs;
protected int curPos = 0;
public LMiter(ListIterator bIter) {
baseIter = bIter;
listLMs = new ArrayList(10);
}
public boolean hasNext() {
return (curPos < listLMs.size()) ? true : preLoadNext();
}
protected boolean preLoadNext() {
// skip over child FObj's that don't add lms
while (baseIter.hasNext()) {
Object theobj = baseIter.next();
if(theobj instanceof FObj) {
FObj fobj = (FObj) theobj;
//listLMs.add(fobj.getLayoutManager());
fobj.addLayoutManager(listLMs);
if(curPos < listLMs.size()) {
return true;
}
}
}
return false;
}
public boolean hasPrevious() {
return (curPos > 0);
}
public Object previous() throws NoSuchElementException {
if (curPos > 0) {
return listLMs.get(--curPos);
} else
throw new NoSuchElementException();
}
public Object next() throws NoSuchElementException {
if (curPos < listLMs.size()) {
return listLMs.get(curPos++);
} else
throw new NoSuchElementException();
}
public void remove() throws NoSuchElementException {
if (curPos > 0) {
listLMs.remove(--curPos);
// Note: doesn't actually remove it from the base!
} else
throw new NoSuchElementException();
}
public void add(Object o) throws UnsupportedOperationException {
throw new UnsupportedOperationException("LMiter doesn't support add");
}
public void set(Object o) throws UnsupportedOperationException {
throw new UnsupportedOperationException("LMiter doesn't support set");
}
public int nextIndex() {
return curPos;
}
public int previousIndex() {
return curPos - 1;
}
}
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