protected bool doCanRead(Object source, AVList parameters)
{
if (WWUtil.isEmpty(source))
{
return(false);
}
if (null == parameters)
{
File file = WWIO.getFileForLocalAddress(source);
if (null == file)
{
return(false);
}
return(GDALUtils.canOpen(file));
}
bool canOpen = false;
GDALDataRaster raster = null;
try
{
raster = new GDALDataRaster(source, true); // read data raster quietly
parameters.setValues(raster.getMetadata());
canOpen = true;
}
catch (Throwable t)
{
// we purposely ignore any exception here, this should be a very quiet mode
canOpen = false;
}
finally
{
if (null != raster)
{
raster.dispose();
raster = null;
}
}
return(canOpen);
}
protected bool doCanRead(Object source, AVList parameters)
{
File file = this.getFile(source);
if (null == file)
{
return(false);
}
// Assume that a proper suffix reliably identifies a DTED file. Otherwise the file will have to be loaded
// to determine that, and there are often tens of thousands of DTED files, which causes raster server start-up
// times to be excessive.
if (this.canReadSuffix(source))
{
parameters.setValue(AVKey.PIXEL_FORMAT, AVKey.ELEVATION); // we know that DTED is elevation data
return(true);
}
bool canRead = false;
try
{
AVList metadata = DTED.readMetadata(file);
if (null != metadata)
{
if (null != parameters)
{
parameters.setValues(metadata);
}
canRead = AVKey.ELEVATION.Equals(metadata.getValue(AVKey.PIXEL_FORMAT));
}
}
catch (Throwable t)
{
Logging.logger().finest(t.getMessage());
canRead = false;
}
return(canRead);
}