Metacat

/**

 *  '$RCSfile$'

 *  Copyright: 2000 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *

 * Author: John Harris 

 * '$Date: 2006-02-19 21:11:53 -0800 (Sun, 19 Feb 2006) $'

 * '$Revision: 2910 $'

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

package edu.ucsb.nceas.metacat.spatial;

import org.apache.log4j.Logger;

/**

 * Class that reflects a query against Metacat to gather spatial data  -- this

 * could be a text query that returns a spatial dataset or a spatial query that

 * returns a spatially-referenced dataset.

 */

public class MetacatSpatialQuery {

  private static Logger log = Logger.getLogger(MetacatSpatialQuery.class.getName());

  private MetacatSpatialDocument msd;

  private SpatialQueryProcessor mqp;

  public MetacatSpatialQuery() { }

  /// query that returns a dataset constarined by a bounding box

  public MetacatSpatialDataset queryDatasetByCartesianBounds(float _xmin,

                                                             float _ymin, 

                                                             float _xmax, 

                                                             float _ymax) {

    /** all database querying is carried out in the Query Processor */

    mqp = new  SpatialQueryProcessor();

    // return the proc's results

    return mqp.queryDatasetByCartesianBounds(_xmin, _ymin, _xmax, _ymax);

  }

  /**

   * returns the metacat spatial document retrieved by this query

   */

  public MetacatSpatialDocument getSpatialDocument(String docid) {

    msd = new MetacatSpatialDocument(docid);

    log.info("creating spatial reference for docid: " + docid);

    /** all database querying is carried out in the Query Processor */

    mqp = new  SpatialQueryProcessor();

    // this call will return the extents (a class) of the docid

    MetacatSpatialExtents _extents = mqp.queryExtentsByDocid(docid);

    //set the elements on the spatialdocument

    msd.setDocid(docid);

    msd.setExtents(_extents);

    // destroy the processor

    mqp.close();

   return msd; 

  }

}