Enum PropertiesPlugin.NullLookup
- All Implemented Interfaces:
Serializable
,Comparable<PropertiesPlugin.NullLookup>
,java.lang.constant.Constable
,StrLookup
- Enclosing class:
- PropertiesPlugin
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Nested Class Summary
Nested classes/interfaces inherited from class java.lang.Enum
Enum.EnumDesc<E extends Enum<E>>
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Enum Constant Summary
Enum Constants -
Field Summary
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionSame asStrLookup.lookup(String)
, but provides additional metadata describing the result.Same asStrLookup.lookup(LogEvent, String)
, but provides additional metadata describing the result.Looks up a String key to a String value.Looks up a String key to a String value possibly using the current LogEvent.static PropertiesPlugin.NullLookup
Returns the enum constant of this type with the specified name.static PropertiesPlugin.NullLookup[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Details
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INSTANCE
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Constructor Details
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NullLookup
private NullLookup()
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Method Details
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values
Returns an array containing the constants of this enum type, in the order they are declared.- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
IllegalArgumentException
- if this enum type has no constant with the specified nameNullPointerException
- if the argument is null
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lookup
Description copied from interface:StrLookup
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"));
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lookup
Description copied from interface:StrLookup
Looks up a String key to a String value possibly using the current LogEvent.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"));
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evaluate
Description copied from interface:StrLookup
Same asStrLookup.lookup(String)
, but provides additional metadata describing the result. Returns null if the key cannot be evaluated, otherwise aLookupResult
wrapping the non-null string value. -
evaluate
Description copied from interface:StrLookup
Same asStrLookup.lookup(LogEvent, String)
, but provides additional metadata describing the result. Returns null if the key cannot be evaluated, otherwise aLookupResult
wrapping the non-null string value.
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