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 *    authors or contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
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package uk.ac.rdg.resc.edal.dataset;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import uk.ac.rdg.resc.edal.exceptions.DataReadingException;

/**
 * A simple in-memory implementation of an {@link HZTDataSource}.
 * 
 * @author Guy Griffiths
 */
public class InMemoryMeshDataSource implements HZTDataSource {

    private final Map<String, Number[][][]> data;

    public InMemoryMeshDataSource(Map<String, Number[][][]> data) {
        this.data = data;
    }

    @Override
    public List<Number> read(String variableId, List<MeshCoordinates3D> coordsToRead)
            throws DataReadingException {
        List<Number> ret = new ArrayList<>();
        
        for(MeshCoordinates3D coords : coordsToRead) {
            if (data.containsKey(variableId) && coords.t >= 0 && coords.z >= 0 && coords.h >= 0) {
                ret.add(data.get(variableId)[coords.t][coords.z][coords.h]);
            } else {
                ret.add(null);
            }
            
        }
        return ret;
    }
    
    @Override
    public void close() throws DataReadingException {
    }

}
