http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * 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: LMiter.java 1610839 2014-07-15 20:25:58Z vhennebert $ */

package org.apache.fop.layoutmgr;

import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;


An iterator for layout managers. 
/** An iterator for layout managers. */
public class LMiter implements ListIterator<LayoutManager> {

    
list of layout managers 
/** list of layout managers */
    protected List<LayoutManager> listLMs;
    
current position in iteration 
/** current position in iteration */
    protected int curPos;
    
The LayoutManager to which this LMiter is attached 
/** The LayoutManager to which this LMiter is attached **/
    private LayoutManager lp;

    
Construct a layout manager iterator.

Params:
  • lp – the associated layout manager (parent)
/**
     * Construct a layout manager iterator.
     * @param lp the associated layout manager (parent)
     */
    public LMiter(LayoutManager lp) {
        this.lp = lp;
        listLMs = lp.getChildLMs();
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public boolean hasNext() {
        return (curPos < listLMs.size()) || lp.createNextChildLMs(curPos);
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public boolean hasPrevious() {
        return (curPos > 0);
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public LayoutManager previous() throws NoSuchElementException {
        if (curPos > 0) {
            return listLMs.get(--curPos);
        } else {
            throw new NoSuchElementException();
        }
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public LayoutManager next() throws NoSuchElementException {
        if (curPos < listLMs.size()) {
            return listLMs.get(curPos++);
        } else {
            throw new NoSuchElementException();
        }
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
     public void remove() throws NoSuchElementException {
        if (curPos > 0) {
            listLMs.remove(--curPos);
            // Note: doesn't actually remove it from the base!
        } else {
            throw new NoSuchElementException();
        }
    }


    
{@inheritDoc} 
/** {@inheritDoc} */
   public void add(LayoutManager lm) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("LMiter doesn't support add");
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public void set(LayoutManager lm) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("LMiter doesn't support set");
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public int nextIndex() {
        return curPos;
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public int previousIndex() {
        return curPos - 1;
    }

}