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/*
* $Id: PositionIterator.java,v 1.11 2003/03/07 07:58:51 jeremias Exp $
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
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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