FilterFactory cleanup - STEMLab/geotools GitHub Wiki

• Motivation: FilterFactory2 causes some confusion

• Contact: Jody Garnett

• Issue: https://osgeo-org.atlassian.net/browse/GEOT-3056

• Tagline: Pull up methods from FilterFactory2

Out of discussion with Micheal Bedward it seems that FilterFactory2 is the cause for some confusion.

Formally this is the difference between:

• FilterFactory - strictly limited to the data structure defined by Filter specifications
• FilterFactory2 - allows for extensions unique to the GeoTools project

Taking a look at the issue today I also note that many methods accept a literal ISO Geometry;
since we don't use that in practice this results in a lot of useless methods that nobody
will ever call.

This proposal is under construction.

Voting has not started yet:

• Andrea Aime
• Ben Caradoc-Davies
• Christian Mueller
• Ian Turton
• Justin Deoliveira
• Jody Garnett (current OSGeo representative)
• Michael Bedward
• Simone Giannecchini

This section is used to make sure your proposal is complete (did you remember documentation?) and has enough paid or volunteer time lined up to be a success

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

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

1. Moves all methods into FilterFactory

   • Pull up methods into FilterFactory; update javadocs to indiacte what is "Strict" and what is a geotools extension

2. Allows methods that expected a literal ISO Geometry to accept a JTS geometry.

   • Change methods using an ISO Geometry to take a Object instead

3. Update default implementation

BEFORE

public interface FilterFactory {
    ...
    /** Checks if the feature's geometry touches, but does not overlap with the geometry held by this object. */
    Touches touches(String propertyName, Geometry geometry);
    ...
}
public interface FilterFactory2 extends FilterFactory {
    /** Checks if the feature's geometry touches, but does not overlap with the geometry held by this object. */
    Touches     touches(Expression propertyName1, Expression geometry2);
}

AFTER

public interface FilterFactory {
    ...
    /** Checks if the feature's geometry touches, but does not overlap with the geometry held by this object. */
    Touches touches(String propertyName, Object geometry);
    /**
     * GeoTools extension to check if a geometry touches, but does not overlap with a second geometry.
     */
    Touches     touches(Expression propertyName1, Expression geometry2);
    ...
}
public interface FilterFactory2 extends FilterFactory {
    // empty
}

Code examples won't be effected by this proposal.