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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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.
*/
/* $Id$ */
package org.apache.fop.layoutmgr;
import java.util.Iterator;
import java.util.NoSuchElementException;
public abstract class PositionIterator implements Iterator {
private Iterator parentIter;
private Object nextObj;
private LayoutProcessor childLM;
private boolean bHasNext;
PositionIterator(Iterator pIter) {
parentIter = pIter;
lookAhead();
//checkNext();
}
public LayoutProcessor getNextChildLM() {
// Move to next "segment" of iterator, ie: new childLM
if (childLM == null && nextObj != null) {
childLM = getLM(nextObj);
bHasNext = true;
}
return childLM;
}
protected abstract LayoutProcessor 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() {
LayoutProcessor 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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