/**
* Create a {@link Filter} that selects features from the test table whose description contains
* the text specified in the argument (case-insensitive).
*
* @param descriptionContainsText text that description column must contain
* @return filter to select features containing text in their description
*/
private Filter buildFilter(String descriptionContainsText) {
FilterFactory filterFactory = new RegfuncFilterFactoryImpl();
// Programmatically build a filter like this fragment from an OGC WFS 1.1.0 Query:
//
// <ogc:Filter>
// <ogc:PropertyIsEqualTo>
// <ogc:Function name="contains_text">
// <ogc:PropertyName>
// gsml:specification/gsml:GeologicUnit/gml:description
// </ogc:PropertyName>
// <ogc:Literal>basalt</ogc:Literal>
// </ogc:Function>
// <ogc:Literal>1</ogc:Literal>
// </ogc:PropertyIsEqualTo>
// </ogc:Filter>
//
// Now step by step:
//
// Build <ogc:PropertyName>
Expression property = filterFactory.property(DESCRIPTION_COLUMN_NAME);
// Build <ogc:Literal>basalt</ogc:Literal> equivalent
Expression string = filterFactory.createLiteralExpression(descriptionContainsText);
// Build <ogc:Function name="contains_text"> equivalent and set its arguments
Expression function = filterFactory.function(TEST_FUNCTION_NAME, property, string);
// Sanity check
assertEquals(RegisteredFunction.class, function.getClass());
// Build <ogc:Literal>1</ogc:Literal>
Expression one = filterFactory.createLiteralExpression(TEST_FUNCTION_RETURN_TRUE);
// Build <ogc:PropertyIsEqualTo>, set its arguments, and return it
return filterFactory.equals(function, one);
}
