Package org.apache.commons.lang3.text
Class StrLookup.SystemPropertiesStrLookup
- java.lang.Object
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- org.apache.commons.lang3.text.StrLookup<java.lang.String>
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- org.apache.commons.lang3.text.StrLookup.SystemPropertiesStrLookup
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.commons.lang3.text.StrLookup
StrLookup.MapStrLookup<V>
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Constructor Summary
Constructors Modifier Constructor Description private
SystemPropertiesStrLookup()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.String
lookup(java.lang.String key)
Looks up a String key to a String value.-
Methods inherited from class org.apache.commons.lang3.text.StrLookup
mapLookup, noneLookup, systemPropertiesLookup
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Method Detail
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lookup
public java.lang.String lookup(java.lang.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.
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.
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