StrLookup.MapStrLookup<V>
Modifier | Constructor and Description |
---|---|
private |
SystemPropertiesStrLookup() |
Modifier and Type | Method and Description |
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java.lang.String |
lookup(java.lang.String key)
Looks up a String key to a String value.
|
mapLookup, noneLookup, systemPropertiesLookup
public java.lang.String lookup(java.lang.String key)
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.
The StrLookup.lookup(String)
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", Integer.valueOf(2)); assertEquals("2", StrLookup.mapLookup(map).lookup("number"));This implementation directly accesses system properties.