Added by jgarnett, last edited by Simone Giannecchini on Oct 31, 2008  (view change)

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Motivation: CQL is limitied to its specification; we need a text format for filter and expression
Contact: jgarnett Mauricio Pazos
Tracker: http://jira.codehaus.org/browse/GEOT-1666
Tagline: We need a text format for filter and expression

This page represents the current plan; for discussion please check the tracker link above.

Contents:

Description

The CQL format has a couple of limitations we need to break free of:

  • propertyName OP expression
  • there is no support for FeatureId filters

This proposal will create a new query language (called TXT) that looks like CQL but offers support for the above two ideas. We would call it WKT but since we are making up is is not yet known.

Status

Voting in progress:

Tasks

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

  no progress done impeded lack mandate/funds/time volunteer needed
status description Release
Define the BNF for TXT based on the CQL origional (see TXT Language Analysis) 2.6.0
Code refactoring in CQLCopiler class to separate the generated parser from filter builder logic 2.6.0
Create a TXT facade class that is method compatible with CQL 2.6.0
Develop ID predicate 2.6.0
Develop Comparison predicate 2.6.0
Develop Between predicate 2.6.0
Develop Null predicate 2.6.0
Develop IN predicate 2.6.0
Develop LIKE Text Pattern predicate 2.6.0
Develop Spatial Predicate Functions 2.6.0
  Update the user guide to present TXT as a non standard option. 2.6.0
  Develop Spatial Relation Predicates 2.6.1

API Changes

TXT Facade Class

class TXT {
    String toTXT( Expression );
    String toTXT( Filter );
    Expression toExpression( String );
    Expression toExpression( String, FilterFactory );
    Filter toFilter( String );
    Filter toFilter( String, FilterFactory );
    List<Filter> toFilterList(String);
    List<Filter> toFilterList(String,FilterFactory);
}

Documentation Changes

list the pages affected by this proposal

Resources

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