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.
| Modifier and Type | Method and Description |
|---|---|
| public default String | Returns: The matching value, null if no match.the key to look up, may be null. key)Implements java. Looks up a String key to provide a String value. |
| public String | Returns: The matching value, null if no match.the key to look up, may be null. key)
Deprecated
Use
apply(String).
Looks up a String key to provide a String value. |
| apply | back to summary |
|---|---|
| public default String apply(final String key) Implements java. Looks up a String key to provide 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", Integer.valueOf(2));
assertEquals("2", StringLookupFactory.mapStringLookup(map).lookup("number"));
| |
| lookup | back to summary |
|---|---|
| public String lookup(String key)
Deprecated Use Looks up a String key to provide 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", Integer.valueOf(2));
assertEquals("2", StringLookupFactory.mapStringLookup(map).lookup("number"));
| |