[Geotools-devel] [jira] Created: (GEOT-3783) Request feature to get transform method on all the classes implementing the interface CoordinateOperation

[lareina s. (JIRA) <ji...@co...>]

Request feature to get transform method on all the classes implementing the interface CoordinateOperation
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                 Key: GEOT-3783
                 URL: https://jira.codehaus.org/browse/GEOT-3783
             Project: GeoTools
          Issue Type: New Feature
          Components: api
    Affects Versions: 2.6.5
         Environment: CentOS 5;
Java 1.6+
            Reporter: lareina sun


We are using Geotools v2.6.5 to perform coordinate transformation
operations. We need to display to our users the details of the transform
method that will be used during the conversion but we can't find a method on
the CoordinateOperation interface that tells us what transform method(s) it
uses. We can only get the detailed description by calling toString() on
CoordinateOperation but this has too much detail (we want a short one-line
description.) We noticed that some concrete classes implementing
CoordinateOperation interface have a getMethod() method which returns an
OperationMethod object which we can call getName().getCode() which returns a
good description but this relies on casting and isn't available for all
CoordinateOperations. Is there an alternative way to get a brief
description of the transform method?

The following is the code we used:

CoordinateOperationFactory coFactory =
CRS.getCoordinateOperationFactory(true);
CoordinateReferenceSystem srcCrs = CRS.decode("EPSG:4267");
CoordinateReferenceSystem toCrs = CRS.decode("EPSG:4269");
CoordinateOperation coorOperation = coFactory.createOperation(srcCrs,
toCrs);
List<SingleOperation> ops =
((DefaultConcatenatedOperation)coorOperation).getOperations();
String methods = "";
for (SingleOperation op : ops)
{
methods += op.getName().getCode() + "->";
}

if (methods.endsWith("->"))
{ methods = methods.substring(0, methods.lastIndexOf("->")); }

In this example the output is "Geocentric transform->Datum shift->Geocentric
transform" but this only works for cases where the transform operations is a
DefaultConcatenatedOperation.

Can we have all the classes implemented the interface "CoordinateOperation" to implement getMethod() feature?

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