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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 java.util.Iterator;
import java.util.NoSuchElementException;
public abstract class PositionIterator implements Iterator {
Iterator parentIter;
Object nextObj;
LayoutManager childLM;
boolean bHasNext;
PositionIterator(Iterator pIter) {
parentIter = pIter;
lookAhead();
//checkNext();
}
public LayoutManager getNextChildLM() {
// Move to next "segment" of iterator, ie: new childLM
if (childLM == null && nextObj != null) {
childLM = getLM(nextObj);
bHasNext = true;
}
return childLM;
}
protected abstract LayoutManager getLM(Object nextObj);
protected abstract Position getPos(Object nextObj);
private void lookAhead() {
if (parentIter.hasNext()) {
bHasNext = true;
nextObj = parentIter.next();
} else {
endIter();
}
}
protected boolean checkNext() {
LayoutManager lm = getLM(nextObj);
if (childLM == null) {
childLM = lm;
} else if (childLM != lm) {
// End of this sub-sequence with same child LM
bHasNext = false;
childLM = null;
return false;
}
return true;
}
protected void endIter() {
bHasNext = false;
nextObj = null;
childLM = null;
}
public boolean hasNext() {
return (bHasNext && checkNext());
}
public Object next() throws NoSuchElementException {
if (bHasNext) {
Object retObj = getPos(nextObj);
lookAhead();
return retObj;
} else {
throw new NoSuchElementException("PosIter");
}
}
protected Object peekNext() {
return nextObj;
}
public void remove() throws UnsupportedOperationException {
throw new UnsupportedOperationException("PositionIterator doesn't support remove");
}
}
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