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*
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// $Id: ZebraClassTrajectoryObsDataset.java 63 2006-07-12 21:50:51Z edavis $
package ucar.nc2.dt.trajectory;
import ucar.nc2.Dimension;
import ucar.nc2.Variable;
import ucar.nc2.Attribute;
import ucar.nc2.constants.FeatureType;
import ucar.nc2.dt.TypedDataset;
import ucar.nc2.dt.TypedDatasetFactoryIF;
import ucar.nc2.dataset.NetcdfDataset;
import ucar.nc2.units.DateUnit;
import ucar.nc2.units.SimpleUnit;
import java.io.IOException;
import java.util.Date;
import java.util.List;
/**
* Implements TrajectoryDataset for datasets with these characteristics:
* <ul>
* <li> it has only one dimension, the dimension is UNLIMITED and is named "time"</li>
* <li> it has one coordinate variable, time(time), with units that
* are udunits time units</li>
* <li> has the variables latitude(time), longitude(time), and altitude(time) with
* units "deg", "deg", and "m", respectively.
* </ul>
*
* @author edavis
* @since Feb 22, 2005T5:37:14 PM
*/
public class ZebraClassTrajectoryObsDataset extends SingleTrajectoryObsDataset implements TypedDatasetFactoryIF
{
private static String timeDimName = "time";
private static String timeVarName = "time";
private static String latVarName = "lat";
private static String lonVarName = "lon";
private static String elevVarName = "alt";
private static String trajId = "trajectory data";
static public boolean isValidFile(NetcdfDataset ncd)
{
return ( buildConfig( ncd ) != null );
}
private static Config buildConfig( NetcdfDataset ncd )
{
// Check for "zebra_platform" attribute w/ value of "class".
Attribute attrib = ncd.findGlobalAttributeIgnoreCase( "zebra_platform" );
if ( attrib == null ) return null;
if ( !attrib.isString() ) return null;
if ( !attrib.getStringValue().equals( "class" ) ) return null;
// Check for "history" attribute w/ value of "ClassNcFile".
attrib = ncd.findGlobalAttributeIgnoreCase( "history" );
if ( attrib == null ) return null;
if ( !attrib.isString() ) return null;
if ( !attrib.getStringValue().equals( "ClassNcFile" ) ) return null;
// Check for existence of global attribute "AvapsEditorVersion".
attrib = ncd.findGlobalAttributeIgnoreCase( "AvapsEditorVersion" );
if ( attrib == null ) return null;
if ( !attrib.isString() ) return null;
// Check for existence of global attribute "SoundingDescription".
attrib = ncd.findGlobalAttributeIgnoreCase( "SoundingDescription" );
if ( attrib == null ) return null;
if ( !attrib.isString() ) return null;
// Check that only one dimension and that it is the time dimension.
List list = ncd.getRootGroup().getDimensions();
if ( list.size() != 1) return null;
Dimension d = (Dimension) list.get(0);
if ( ! d.getName().equals( timeDimName )) return null;
Config trajConfig = new Config();
trajConfig.setTimeDim( d);
// Check that have time variable with units that are udunits time
Variable var = ncd.getRootGroup().findVariable( timeVarName );
if ( var == null) return null;
list = var.getDimensions();
if ( list.size() != 1) return null;
d = (Dimension) list.get(0);
if ( ! d.getName().equals( timeDimName )) return null;
String units = var.findAttribute( "units").getStringValue();
Date date = DateUnit.getStandardDate( "0 " + units);
if ( date == null) return null;
trajConfig.setTimeVar( var);
// Check for latitude variable with time dimension and units convertable to "degrees_north".
var = ncd.getRootGroup().findVariable( latVarName );
if ( var == null) return null;
list = var.getDimensions();
if ( list.size() != 1) return null;
d = (Dimension) list.get(0);
if ( ! d.getName().equals( timeDimName)) return null;
units = var.findAttribute( "units").getStringValue();
if ( ! SimpleUnit.isCompatible( units, "degrees_north")) return null;
trajConfig.setLatVar( var);
// Check for longitude variable with time dimension and units convertable to "degrees_east".
var = ncd.getRootGroup().findVariable( lonVarName);
if ( var == null) return null;
list = var.getDimensions();
if ( list.size() != 1) return null;
d = (Dimension) list.get(0);
if ( ! d.getName().equals( timeDimName )) return null;
units = var.findAttribute( "units").getStringValue();
if ( ! SimpleUnit.isCompatible( units, "degrees_east")) return null;
trajConfig.setLonVar( var);
// Check for altitude variable with time dimension and units convertable to "m".
var = ncd.getRootGroup().findVariable( elevVarName);
if ( var == null) return null;
list = var.getDimensions();
if ( list.size() != 1) return null;
d = (Dimension) list.get(0);
if ( ! d.getName().equals( timeDimName )) return null;
units = var.findAttribute( "units").getStringValue();
if ( ! SimpleUnit.isCompatible( units, "meters")) return null;
trajConfig.setElevVar( var);
trajConfig.setTrajectoryId( trajId);
return trajConfig;
}
/////////////////////////////////////////////////
// TypedDatasetFactoryIF
public boolean isMine(NetcdfDataset ds) { return isValidFile(ds); }
public TypedDataset open( NetcdfDataset ncd, ucar.nc2.util.CancelTask task, StringBuilder errlog) throws IOException {
return new ZebraClassTrajectoryObsDataset( ncd);
}
public FeatureType getScientificDataType() { return FeatureType.TRAJECTORY; }
public ZebraClassTrajectoryObsDataset() {}
public ZebraClassTrajectoryObsDataset( NetcdfDataset ncd ) throws IOException
{
super( ncd);
Config trajConfig = buildConfig( ncd);
this.setTrajectoryInfo( trajConfig );
}
}