terrestris GeoTools filter functions

Prerequisites: Java 11 and maven 3.5

• build with mvn install
• copy into Geoserver's WEB-INF/lib to enable

After that, you currently have the following extra functions available:

stringFormat

A function that utilizes Java's String.format function for better control of string conversions. It takes three parameters:

• format - the format string as per https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Formatter.html#syntax
• class - the (fully qualified) class name of the parameter value, eg. java.lang.Double
• target - the target value

Example:

CQL_FILTER = stringFormat('%f', 'java.lang.Double', some_attribute) ilike '%123%'