/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
* (c) 2001 - 2014 OpenPlans
* This code is licensed under the GPL 2.0 license, available at the root
* application directory.
*/
package org.geoserver.wms.dimension.impl;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.geoserver.catalog.CoverageInfo;
import org.geoserver.catalog.DimensionInfo;
import org.geoserver.catalog.ResourceInfo;
import org.geoserver.catalog.util.ReaderDimensionsAccessor;
import org.geoserver.wms.dimension.AbstractDefaultValueSelectionStrategy;
import org.geotools.coverage.grid.io.GridCoverage2DReader;
import org.geotools.util.Converters;
import org.geotools.util.logging.Logging;
/**
* Default implementation for selecting the default values for dimensions of
* coverage (raster) resources using the minimum domain value strategy.
*
* @author Ilkka Rinne / Spatineo Inc for the Finnish Meteorological Institute
*
*/
public class CoverageMinimumValueSelectionStrategyImpl extends AbstractDefaultValueSelectionStrategy {
private static Logger LOGGER = Logging.getLogger(CoverageMinimumValueSelectionStrategyImpl.class);
/**
* Default constructor.
*/
public CoverageMinimumValueSelectionStrategyImpl() {
}
@Override
public <T> T getDefaultValue(ResourceInfo resource, String dimensionName,
DimensionInfo dimension, Class<T> clz) {
Object retval = null;
try {
GridCoverage2DReader reader = (GridCoverage2DReader) ((CoverageInfo) resource)
.getGridCoverageReader(null, null);
ReaderDimensionsAccessor dimAccessor = new ReaderDimensionsAccessor(reader);
if (dimensionName.equals(ResourceInfo.TIME)) {
retval = dimAccessor.getMinTime();
} else if (dimensionName.equals(ResourceInfo.ELEVATION)) {
retval = dimAccessor.getMinElevation();
} else if (dimensionName.startsWith(ResourceInfo.CUSTOM_DIMENSION_PREFIX)){
String custDimName = dimensionName.substring(ResourceInfo.CUSTOM_DIMENSION_PREFIX.length());
// see if we have an optimize way to get the minimum
String min = reader.getMetadataValue(custDimName.toUpperCase()
+ "_DOMAIN_MINIMUM");
if (min != null) {
retval = min;
}
else {
// ok, get the full domain then
List<String> domain = dimAccessor.getDomain(custDimName);
if (domain.isEmpty()) {
retval = null;
} else {
//Just a lexical (string) sort.
//Should we be prepared for numeric and date values?
Collections.sort(domain);
retval = domain.get(0);
}
}
}
} catch (IOException e) {
LOGGER.log(Level.FINER, e.getMessage(), e);
}
return Converters.convert(retval, clz);
}
}