/**
* 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.io.IOException;
import java.io.RandomAccessFile;
import uk.ac.leeds.ccg.andyt.grids.utilities.AbstractIterator;
/**
* For iterating through the values in a Grid2DSquareCellIntChunkRAF instance.
* The values are not returned in any particular order.
*/
public class Grid2DSquareCellIntChunkRAFIterator extends AbstractIterator {
private RandomAccessFile data;
/** Creates a new instance of Grid2DSquareIntIterator */
public Grid2DSquareCellIntChunkRAFIterator() {}
/**
* Creates a new instance of Grid2DSquareIntIterator
* @param grid2DSquareCellIntChunkRAF The Grid2DSquareCellIntChunkRAF to
* iterate over.
*/
public Grid2DSquareCellIntChunkRAFIterator(
Grid2DSquareCellIntChunkRAF grid2DSquareCellIntChunkRAF) {
this.data = grid2DSquareCellIntChunkRAF.getData();
try {
this.data.seek( 0L );
} catch ( IOException ioe0 ) {
// Shouldn't happen!
ioe0.printStackTrace();
}
}
/**
* Returns true if the iteration has more elements. (In other
* words, returns true if next would return an element
* rather than throwing an exception.)
*
* @return true if the iterator has more elements.
*/
@Override
public boolean hasNext() {
try {
if ( this.data.getFilePointer() < this.data.length() ) {
return true;
}
} catch ( IOException ioe0 ) {
// Shouldn't happen...
ioe0.printStackTrace();
}
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 {
return new Integer( this.data.readInt() );
} catch ( IOException ioe0 ) {
// Should be at the end of the file...
ioe0.printStackTrace();
}
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 next. 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 remove
* operation is not supported by this Iterator.
* @exception IllegalStateException if the next method has not
* yet been called, or the remove method has already
* been called after the last call to the next
* method.
*/
@Override
public void remove() {}
}