Package org.apache.commons.text
Class StrLookup.SystemPropertiesStrLookup
java.lang.Object
org.apache.commons.text.StrLookup<String>
org.apache.commons.text.StrLookup.SystemPropertiesStrLookup
- All Implemented Interfaces:
StringLookup
Lookup implementation based on system properties.
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Nested Class Summary
Nested classes/interfaces inherited from class org.apache.commons.text.StrLookup
StrLookup.MapStrLookup<V>
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Constructor Summary
Constructors -
Method Summary
Methods inherited from class org.apache.commons.text.StrLookup
mapLookup, noneLookup, resourceBundleLookup, systemPropertiesLookup
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Constructor Details
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SystemPropertiesStrLookup
private SystemPropertiesStrLookup()
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Method Details
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lookup
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", new Integer(2)); assertEquals("2", StringLookupFactory.mapStringLookup(map).lookup("number"));
This implementation directly accesses system properties.- Parameters:
key
- the key to look up, may be null.- Returns:
- The matching value, null if no match.
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