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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
 *
 *   Portions of this software were developed by the Unidata Program at the
 *   University Corporation for Atmospheric Research.
 *
 *   Access and use of this software shall impose the following obligations
 *   and understandings on the user. The user is granted the right, without
 *   any fee or cost, to use, copy, modify, alter, enhance and distribute
 *   this software, and any derivative works thereof, and its supporting
 *   documentation for any purpose whatsoever, provided that this entire
 *   notice appears in all copies of the software, derivative works and
 *   supporting documentation.  Further, UCAR requests that the user credit
 *   UCAR/Unidata in any publications that result from the use of this
 *   software or in any product that includes this software. The names UCAR
 *   and/or Unidata, however, may not be used in any advertising or publicity
 *   to endorse or promote any products or commercial entity unless specific
 *   written permission is obtained from UCAR/Unidata. The user also
 *   understands that UCAR/Unidata is not obligated to provide the user with
 *   any support, consulting, training or assistance of any kind with regard
 *   to the use, operation and performance of this software nor to provide
 *   the user with any updates, revisions, new versions or "bug fixes."
 *
 *   THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS 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 UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 *   INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 *   FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 *   NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 *   WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package ucar.nc2.ft;

/**
 * An iterator over PointFeatureCollections.
 *   try {
   while (iter.hasNext())
     process(iter.next());
  } finally {
    iter.finish();
  }
  
 *
 * @author caron
 */
public interface PointFeatureCollectionIterator {

  /**
   * true if another PointFeatureCollection is available
   * @return true if another PointFeatureCollection is available
   * @throws java.io.IOException on i/o error
   */
  public boolean hasNext() throws java.io.IOException;

  /**
   * Returns the next PointFeatureCollection
   * You must call hasNext() before calling next(), even if you know it will return true.
   * @return the next PointFeatureCollection 
   * @throws java.io.IOException on i/o error
   */
  public PointFeatureCollection next() throws java.io.IOException;

  /**
   * Make sure that the iterator is complete, and recover resources.
   * You must complete the iteration (until hasNext() returns false) or call finish().
   * may be called more than once.
   */
  public void finish();

  /**
   * Hint to use this much memory in buffering the iteration.
   * No guarantee that it will be used by the implementation.
   * @param bytes amount of memory in bytes
   */
  public void setBufferSize( int bytes);

  /**
   * A filter on PointFeatureCollection.
   */
  public interface Filter {
   /**
     * Filter collections.
     * @param pointFeatureCollection check this collection
     * @return true if the collection passes the filter
     */
    public boolean filter(PointFeatureCollection pointFeatureCollection);
  }

}