Package com.intergral.deep.agent.api.utils.string.lookup

Interface StringLookup

  • public interface StringLookup
    Lookup a String key to a String value.

    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

    Since:
    1.3

    • Method Detail

      • lookup

        String lookup​(String key)
        Looks up a String key to a String value.

        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", StrLookup.mapLookup(map).lookup("number"));
        Parameters:
        key - the key to look up, may be null
        Returns:
        the matching value, null if no match