@FunctionalInterface public interface StringLookup
This class represents the simplest form of a string to string map. It has a benefit over a map in that it can create the result on demand based on the key.
For example, it would be possible to implement a lookup that used the key as a primary key, and looked up the value on demand from the database.
The internal implementation may use any mechanism to return the value. The simplest implementation is to use a Map. However, virtually any implementation is possible.
For example, it would be possible to implement a lookup that used the key as a primary key, and looked up the value on demand from the database Or, a numeric based implementation could be created that treats the key as an integer, increments the value and return the result as a string - converting 1 to 2, 15 to 16 etc.
This method always returns a String, regardless of the underlying data, by converting it as necessary. For example:
Map<String, Object> map = new HashMap<String, Object>(); map.put("number", new Integer(2)); assertEquals("2", StringLookupFactory.mapStringLookup(map).lookup("number"));
key- the key to look up, may be null.
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