org.josql.filters

Class JoSQLLogRecordFilter

java.lang.Object

org.josql.filters.AbstractJoSQLFilter

org.josql.filters.DefaultObjectFilter

org.josql.filters.JoSQLLogRecordFilter

public class JoSQLLogRecordFilter
extends DefaultObjectFilter

A Filter that uses a JoSQL statement to provide the filtering. The value returned by the isLoggable(LogRecord) method is determined by executing the WHERE clause of a JoSQL statement on each LogRecord passed in.

Since this uses a sub-set of the JoSQL functionality certain restrictions apply:

• The SELECT clause is ignored.
• The object defined in the FROM clause must be java.util.logging.LogRecord
• EXECUTE ON functions are not supported here since there is no way to get the entire set of objects to work on.
• ORDER BY, GROUP BY, HAVING and LIMIT clauses are ignored.

Examples:

   SELECT *
   FROM   java.tuil.logging.LogRecord
   WHERE  name $LIKE '%.html'
   AND    millis > toDateMillis('12-04-2004')
   AND    sequenceNumber BETWEEN (10000 AND 20000)
   AND    message $LIKE '%internal%'
   AND    loggerName = 'internal_logger'
   AND    level.name IN ('SEVERE', 'WARNING')
 

If you are using a custom log record then you can always just extend this class and override the getExpectedClass() method to return your specific sub-class.

Field Summary

Fields

Modifier and Type	Field and Description
protected Class	expected

Fields inherited from class org.josql.filters.AbstractJoSQLFilter

badQuery, exp, q

Constructor Summary

Constructors

Constructor and Description
JoSQLLogRecordFilter(Query q) Init this filter with the query already built and parsed.
JoSQLLogRecordFilter(String q) Init this filter with the query.

Method Summary

Modifier and Type	Method and Description
boolean	accept(Object o) Apply the WHERE clause of the statement to the object passed in.
Class	getExpectedClass() Always returns LogRecord.
boolean	isLoggable(LogRecord l) Apply the WHERE clause of the statement to the LogRecord passed in.

Methods inherited from class org.josql.filters.AbstractJoSQLFilter

clearException, getException, getQuery, setQuery, setQuery

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

expected

protected Class expected

Constructor Detail

JoSQLLogRecordFilter

public JoSQLLogRecordFilter(String q)
                     throws QueryParseException

Init this filter with the query.

Parameters:

q - The query.

Throws:

QueryParseException - If there is an issue with the parsing of the query, or if the FROM class is not LogRecord.

JoSQLLogRecordFilter

public JoSQLLogRecordFilter(Query q)
                     throws IllegalStateException,
                            QueryParseException

Init this filter with the query already built and parsed.

Parameters:

q - The query.

Throws:

IllegalStateException - If the Query object has not been parsed.

QueryParseException - If the FROM class is not LogRecord.

Method Detail

accept

public boolean accept(Object o)

Description copied from class: DefaultObjectFilter

Apply the WHERE clause of the statement to the object passed in. If an exception is thrown by the execution of the WHERE clause the Query is marked as "dirty" and the where clause is no longer executed on the passed in objects (since it is likely that the WHERE clause will fail for all objects). You can get access to exception by using: AbstractJoSQLFilter.getException().

Overrides:

accept in class DefaultObjectFilter

Parameters:

o - The object to evaluate the WHERE on.

Returns:

true if the WHERE clause evaluates to true.

isLoggable

public boolean isLoggable(LogRecord l)

Apply the WHERE clause of the statement to the LogRecord passed in. If an exception is thrown by the execution of the WHERE clause the Query is marked as "dirty" and the where clause is no longer executed on the passed in files (since it is likely that the WHERE clause will fail for all LogRecord objects). You can get access to exception by using: AbstractJoSQLFilter.getException().

Parameters:

l - The log record to evaluate the WHERE on.

Returns:

true if the WHERE clause evaluates to true.

getExpectedClass

public Class getExpectedClass()

Always returns LogRecord.

Overrides:

getExpectedClass in class DefaultObjectFilter

Returns:

The log record class.