public Helmert getWGS84Transformation(GeographicCRS sourceCRS) {
if (sourceCRS == null) {
return null;
}
if (LOG.isDebug()) {
LOG.logDebug(
"Searching for wgs84 transformation for given sourceCRS: "
+ Arrays.toString(sourceCRS.getIdentifiers()));
}
Helmert result = cachedWGS84Transformations.get(sourceCRS);
if (result == null) {
Transformation parsedTransformation = getTransformation(sourceCRS, null);
if (parsedTransformation instanceof Helmert) {
LOG.logDebug(
"Found an helmert transformation for sourceCRS: "
+ Arrays.toString(sourceCRS.getIdentifiers()));
result = (Helmert) parsedTransformation;
} else {
if (parsedTransformation instanceof CRSTransformation) {
CoordinateSystem target = ((CRSTransformation) parsedTransformation).getTargetCRS();
GeographicCRS t = null;
if (LOG.isDebug()) {
LOG.logDebug(
"Found crstransformation for sourceCRS: "
+ Arrays.toString(sourceCRS.getIdentifiers())
+ " and targetCRS: "
+ Arrays.toString(target.getIdentifiers())
+ " will now use the targetCRS to find a Helmert transformation.");
}
if (target.getType() == CoordinateSystem.COMPOUND_CRS) {
if (((CompoundCRS) target).getUnderlyingCRS().getType()
== CoordinateSystem.PROJECTED_CRS) {
t = ((ProjectedCRS) ((CompoundCRS) target).getUnderlyingCRS()).getGeographicCRS();
} else if (((CompoundCRS) target).getUnderlyingCRS().getType()
== CoordinateSystem.GEOGRAPHIC_CRS) {
t = (GeographicCRS) target;
} else {
LOG.logWarning(
"Wgs84 Transformation lookup is currently only supported for GeographicCRS-chains.");
}
} else if (target.getType() == CoordinateSystem.PROJECTED_CRS) {
t = ((ProjectedCRS) target).getGeographicCRS();
} else if (target.getType() == CoordinateSystem.GEOGRAPHIC_CRS) {
t = (GeographicCRS) target;
} else {
LOG.logWarning(
"Wgs84 Transformation lookup is currently only supported for GeographicCRS-chains.");
}
if (t != null) {
if (LOG.isDebug()) {
LOG.logDebug(
"Trying to resolve target to find a wgs84transformation for the 'targetCRS': "
+ Arrays.toString(t.getIdentifiers()));
}
result = getWGS84Transformation(t);
}
} else {
LOG.logWarning(
"The transformation is not an instance of CRSTransformation nor a Helmert, ignoring it.");
}
}
}
if (result != null) {
if (LOG.isDebug()) {
LOG.logDebug(
"For the given crs: "
+ sourceCRS.getIdentifier()
+ " following helmert transformation was found:\n"
+ result);
}
cachedWGS84Transformations.put(sourceCRS, result);
} else {
LOG.logInfo(
"No helmert transformation found for the given crs: " + sourceCRS.getIdentifier());
}
return result;
}
