/**
 * Version 1.0 is to handle single variable 2DSquareCelled raster data.
 * Copyright (C) 2005 Andy Turner, CCG, University of Leeds, UK.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
package uk.ac.leeds.ccg.andyt.grids.core;
import java.util.HashMap;
import java.util.Iterator;
import java.util.NoSuchElementException;
import uk.ac.leeds.ccg.andyt.grids.utilities.AbstractIterator;

/**
 * For iterating through the values in a Grid2DSquareCellInt instance. The 
 * values are not returned in any particular order.
 */
public class Grid2DSquareCellIntIterator 
        extends AbstractIterator {
    
    private Iterator grid2DSquareCellIntHashMapIterator;
    private AbstractGrid2DSquareCellIntChunk grid2DSquareCellIntChunk;
    private AbstractIterator grid2DSquareCellIntChunkIterator;
    
    /** Creates a new instance of Grid2DSquareIntIterator */
    public Grid2DSquareCellIntIterator() {}
    
    /**
     * Creates a new instance of Grid2DSquareIntIterator
     * @param grid2DSquareCellInt The Grid2DSquareCellInt to iterate over.
     */
    public Grid2DSquareCellIntIterator( 
            Grid2DSquareCellInt grid2DSquareCellInt ) {
        this.grid2DSquareCellIntHashMapIterator = 
                grid2DSquareCellInt._ChunkID_AbstractGrid2DSquareCellChunk_HashMap.values().iterator();
        if ( grid2DSquareCellIntHashMapIterator.hasNext() ) {
            this.grid2DSquareCellIntChunk = 
                    ( AbstractGrid2DSquareCellIntChunk ) 
                    this.grid2DSquareCellIntHashMapIterator.next();
            initGrid2DSquareCellIntChunkIterator();
        }
    }
    
    /**
     * Initialises this.grid2DSquareCellIntChunkIterator from this.grid2DSquareCellIntChunk
     */
    private void initGrid2DSquareCellIntChunkIterator() {
        try {
            this.grid2DSquareCellIntChunkIterator = 
                    new Grid2DSquareCellIntChunk64CellMapIterator( 
                    ( Grid2DSquareCellIntChunk64CellMap ) this.grid2DSquareCellIntChunk );
        } catch ( ClassCastException cce0 ) {
            try {
                this.grid2DSquareCellIntChunkIterator = 
                        new Grid2DSquareCellIntChunkArrayIterator( 
                        ( Grid2DSquareCellIntChunkArray ) this.grid2DSquareCellIntChunk );
            } catch ( ClassCastException cce1 ) {
                try {
                    this.grid2DSquareCellIntChunkIterator = 
                            new Grid2DSquareCellIntChunkJAIIterator( 
                            ( Grid2DSquareCellIntChunkJAI ) this.grid2DSquareCellIntChunk );
                } catch ( ClassCastException cce2 ) {
                    this.grid2DSquareCellIntChunkIterator = 
                            new Grid2DSquareCellIntChunkMapIterator( 
                            ( Grid2DSquareCellIntChunkMap ) this.grid2DSquareCellIntChunk );
                }
            }
        }
    }
    
    /**
     * Initialises this.grid2DSquareCellIntChunkIterator from this.grid2DSquareCellIntChunk
     */
    public AbstractIterator initGrid2DSquareCellIntChunkIterator(
            AbstractGrid2DSquareCellIntChunk grid2DSquareCellIntChunk ) {
        AbstractIterator grid2DSquareCellIntChunkIterator;
        try {
            grid2DSquareCellIntChunkIterator = 
                    new Grid2DSquareCellIntChunk64CellMapIterator( 
                    ( Grid2DSquareCellIntChunk64CellMap ) grid2DSquareCellIntChunk );
        } catch ( ClassCastException cce0 ) {
            try {
                grid2DSquareCellIntChunkIterator = 
                        new Grid2DSquareCellIntChunkArrayIterator( 
                        ( Grid2DSquareCellIntChunkArray ) grid2DSquareCellIntChunk );
            } catch ( ClassCastException cce1 ) {
                try {
                    grid2DSquareCellIntChunkIterator = 
                            new Grid2DSquareCellIntChunkJAIIterator( 
                            ( Grid2DSquareCellIntChunkJAI ) grid2DSquareCellIntChunk );
                } catch ( ClassCastException cce2 ) {
                    grid2DSquareCellIntChunkIterator = 
                            new Grid2DSquareCellIntChunkMapIterator( 
                            ( Grid2DSquareCellIntChunkMap ) grid2DSquareCellIntChunk );
                }
            }
        }
        return grid2DSquareCellIntChunkIterator;
    }
    
    /**
     * Returns <tt>true</tt> if the iteration has more elements. (In other
     * words, returns <tt>true</tt> if <tt>next</tt> would return an element
     * rather than throwing an exception.)
     *
     * @return <tt>true</tt> if the iterator has more elements.
     */
    @Override
    public boolean hasNext() {
        if ( this.grid2DSquareCellIntChunkIterator.hasNext() ) {
            return true;
        } else {
            while ( grid2DSquareCellIntHashMapIterator.hasNext() ) {
                AbstractGrid2DSquareCellIntChunk grid2DSquareCellIntChunk = 
                        ( AbstractGrid2DSquareCellIntChunk ) 
                        this.grid2DSquareCellIntHashMapIterator.next();
                AbstractIterator grid2DSquareCellIntChunkIterator =
                        initGrid2DSquareCellIntChunkIterator( grid2DSquareCellIntChunk );
                if ( grid2DSquareCellIntChunkIterator.hasNext() ) {
                    return true;
                }
            }
        }
        return false;
    }
    
    /**
     * Returns the next element in the iteration.
     *
     * @return the next element in the iteration.
     * @exception NoSuchElementException iteration has no more elements.
     */
    @Override
    public Object next() {
        try {
            if ( this.grid2DSquareCellIntChunkIterator.hasNext() ) {
                return this.grid2DSquareCellIntChunkIterator.next();
            } else {
                while ( grid2DSquareCellIntHashMapIterator.hasNext() ) {
                    this.grid2DSquareCellIntChunk = 
                            ( AbstractGrid2DSquareCellIntChunk ) 
                            this.grid2DSquareCellIntHashMapIterator.next();
                    this.grid2DSquareCellIntChunkIterator = 
                            initGrid2DSquareCellIntChunkIterator( grid2DSquareCellIntChunk );
                    if ( this.grid2DSquareCellIntChunkIterator.hasNext() ) {
                        return this.grid2DSquareCellIntChunkIterator.next();
                    }
                }
            }
        } catch ( NoSuchElementException nsee0 ) {
            nsee0.printStackTrace();
            System.out.println( nsee0.toString() );
        }
        return null;
    }
    
    /**
     *
     * Removes from the underlying collection the last element returned by the
     * iterator (optional operation).  This method can be called only once per
     * call to <tt>next</tt>.  The behavior of an iterator is unspecified if
     * the underlying collection is modified while the iteration is in
     * progress in any way other than by calling this method.
     *
     * @exception UnsupportedOperationException if the <tt>remove</tt>
     *		  operation is not supported by this Iterator.
     *
     * @exception IllegalStateException if the <tt>next</tt> method has not
     *		  yet been called, or the <tt>remove</tt> method has already
     *		  been called after the last call to the <tt>next</tt>
     *		  method.
     */
    @Override
    public void remove() {}
    
}