Package org.apache.log4j.rule
Class ExistsRule
- java.lang.Object
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- org.apache.log4j.rule.AbstractRule
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- org.apache.log4j.rule.ExistsRule
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- All Implemented Interfaces:
java.io.Serializable
,Rule
public class ExistsRule extends AbstractRule
A Rule class implementing a not null (and not empty string) check.- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description private java.lang.String
field
field name.private static LoggingEventFieldResolver
RESOLVER
field resolver.(package private) static long
serialVersionUID
Serialization id.
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Constructor Summary
Constructors Modifier Constructor Description private
ExistsRule(java.lang.String fld)
Create new instance.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
evaluate(org.apache.log4j.spi.LoggingEvent event, java.util.Map matches)
Returns true if this implementation of the rule accepts the LoggingEvent, or false if not.static Rule
getRule(java.lang.String field)
Get an instance of ExistsRule.static Rule
getRule(java.util.Stack stack)
Create an instance of ExistsRule using the top name on the stack.-
Methods inherited from class org.apache.log4j.rule.AbstractRule
addPropertyChangeListener, firePropertyChange, firePropertyChange, removePropertyChangeListener
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Field Detail
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serialVersionUID
static final long serialVersionUID
Serialization id.- See Also:
- Constant Field Values
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RESOLVER
private static final LoggingEventFieldResolver RESOLVER
field resolver.
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field
private final java.lang.String field
field name.
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Method Detail
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getRule
public static Rule getRule(java.lang.String field)
Get an instance of ExistsRule.- Parameters:
field
- field.- Returns:
- instance of ExistsRule.
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getRule
public static Rule getRule(java.util.Stack stack)
Create an instance of ExistsRule using the top name on the stack.- Parameters:
stack
- stack- Returns:
- instance of ExistsRule.
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evaluate
public boolean evaluate(org.apache.log4j.spi.LoggingEvent event, java.util.Map matches)
Returns true if this implementation of the rule accepts the LoggingEvent, or false if not.What True/False means can be client-specific.
- Parameters:
event
- LoggingEvent this instance will evaluatematches
- a Map of event field keys to Sets of matching strings (may be null) which will be updated during execution of this method to include field and string matches based on the rule evaluation results- Returns:
- true if this Rule instance accepts the event, otherwise false.
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