introduction of getinfo - STEMLab/geotools GitHub Wiki

• Contact: Jody Garnett, Johann Sorel

• Tracker: https://osgeo-org.atlassian.net/browse/GEOT-1657

• Tagline: What is this? No really...

We need to access a description of what a spatial resources is. The goal is to make this information available to GeoTools developers:

• will give widgets swing pending some more information to display and describe;
• will allow uDig to back port some code. In some cases it will allow uDig to close up some anonymous subclasses: JDBC DataStores often subclassed for connection, WFSDataStore subclassed for capabilities information.

Previous work focused on making the description available for searching, this proposal is about making the description available on the classes directly.

What the description is is well understood; it is: "Dublin Core plus a little bit more" (ie bounds and crs). In GeoTools 2.4.x this ideas is represented as GeoResourceInfo and ServiceInfo.

ServiceInfo

shapefile

postgis

wms

wfs

description

title

for display in user interface

keywords

description

publisher

schema

type of service

source

icon

for display in user interface

shapefile

postgis

wms

wfs

additions

access fees

do not care

ResourceInfo

shapefile

postgis

wms

wfs

notes

title

for display in user interface

keywords

description

name

already part of data access api?

schema

type of data

source

icon

for display in user interface

bounds

crs

matches bounds crs

shapefile

postgis

wms

wfs

additions

latlonextent

do we care?

These info classes will be moved into org.geotools.data as part of the proposal (see This is NOT catalog above).

There have been two suggestions on how to extend this core set:

• add a Map of some kind to the data structure, with static final constants for known keys
• extend the interface specifically

This proposal has been accepted:

• Andrea Aime +1
• Ian Turton +0
• Justin Deoliveira +0
• Jody Garnett +1
• Martin Desruisseaux +1 with comments (see below)
• Simone Giannecchini +0

Community support:

• Gabriel Roldán +1

• Jesse Eichar +1

      | :white_check_mark: | :no_entry: | :warning:               | :negative_squared_cross_mark: |
  

------------|--------------------|------------|-------------------------|-------------------------------| no progress | done | impeded | lack mandate/funds/time | volunteer needed |

1. ✅ Move catalog stuff out of the way to an unsupported/module to prevent confusion
2. ✅ Add org.geotools.data.ServiceInfo and org.geotools.data.ResourceInfo (remove a few stray getTile methods)
3. ✅ Add getInfo methods to WFSDataStore for gabriel to review
4. ✅ Add getInfo methods to ShapefileDataSTore for Jesse to review
5. ✅ Add getInfo method to AbstractGridCoverage2DReader
6. ✅ Add getInfo method to DataStore and stub at the AbstractDataStore, JDBCDataStore, ContentDataStore, Implement for stand alone implementations like ArcSDE
7. ✅ Take the best of geotools or udig getInfo code as the implementation
8. ✅ Cut over uDig to use this code as the final sanity check
   This was done to communicate WFS GetCapabilities information
9. ✅ Provide an example use in the user guide: http://docs.geotools.org/latest/userguide/library/api/datastore.html

package org.geotools.catalog;
interface ServiceInfo {
   ...
}

package org.geotools.catalog;
interface GeoResourceInfo {
   ...
}

Move ServiceInfo to org.geotools.data.ServiceInfo

package org.geotools.data;
interface ServiceInfo {
   String getTitle();
   String getDescription();
   Icon getIcon();
   Set<String> getKeywords();
   URI getPublisher();
   URI getSchema();
   URI getSource();
}

Move GeoResourceInfo to org.geotools.data.ResourceInfo:

package org.geotools.data;
interface ResourceInfo {
  // Dublin Core
  String getName();
  String getTitle();
  String getDescription();
  Icon getIcon();
  Set<String> getKeywords();
  URI getSchema();

  // And a little bit more
  ReferencedEnvelope getBounds();
  CoordinateReferenceSystem getCRS();
}

ServiceInfo can be accessed from DataStore:

import org.geotools.data.ServiceInfo;
interface DataStore {
    ServiceInfo getInfo();
}

ResourceInfo can be accessed from FeatureSource:

import org.geotools.data.ResourceInfo;
interface FeatureSource {
    ResourceInfo getInfo();
}

ServiceInfo and ResourceInfo can be accessed from AbstractGridCoverageReader2DReader:

import org.geotools.data.ServiceInfo;
import org.geotools.data.ResourceInfo;
interface AbstractGridCoverageReader2DReader{
   ServiceInfo getInfo();
   ResourceInfo getInfo( String subname );
}

ServiceInfo and ResourceInfo can be accessed from WebMapServer:

class WebMapServer extends AbstractOpenWebService {
  ServiceInfo getInfo();
}
class Layer {
  ResourceInfo getInfo();
}

list the pages effected by this proposal

• https://github.com/geotools/geotools/tree/master/gt/demo/example/
• User Guide