
Appendix B RFID Event Manager Component Reference 169
Delta Filter
This component reports RFID tags leaving and entering the radio frequency fields.
For example, on a reader, if at time T1, two EPCs were discovered, then two TagsIn
events are reported. If at time T2, one of the EPCs disappeared, then a TagsOut
event is reported.
TABLE B-2 Delta Filter Properties
Property Description Value
classname Java class name. com.sun.autoid.filter.Delta
LogLevel Defines a set of standard logging
levels that can be used to control
logging output.
Possible values are:
• SEVERE (highest value)
• WARNING
• INFO
• CONFIG
• FINE
• FINER
• FINEST (lowest value)
reportIn Specifies whether to report the
incoming tags.
Default = true
reportOut Specifies whether to report the
leaving tags.
Default = true
reportOnEmpty Specifies whether to report even
if no tags have changed.
Default = false
useRecord Specifies whether to use
recorded events from the
previous run.
Default = false
RecordRoot Specifies the path to get and
save the events.
Default = java.io.tmpdir
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