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org.josql.filters
Class JoSQLFileFilter  

java.lang.Object
  org.josql.filters.AbstractJoSQLFilter
      org.josql.filters.JoSQLFileFilter

All Implemented Interfaces:

java.io.FileFilter

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public class JoSQLFileFilter

extends AbstractJoSQLFilter

implements java.io.FileFilter

A java.io.FileFilter that uses a JoSQL statement to provide the filtering. The value returned by the accept(File) 55 method is determined by executing the WHERE clause of a JoSQL statement on each File 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.io.File
• 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.io.File
   WHERE  name $LIKE '%.html'
   AND    lastModified > toDateMillis 55 ('12-04-2004')
   AND    file
 

Last Modified By: $Author: barrygently $
Last Modified On: $Date: 2005/01/07 17:10:40 $
Current Revision: $Revision: 1.1 $

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Field Summary

 

Fields inherited from class org.josql.filters.AbstractJoSQLFilter

badQuery, exp, q

 

Constructor Summary

JoSQLFileFilter(org.josql.Query q)           Init this file filter with the query already built and parsed.

JoSQLFileFilter(java.lang.String q)           Init this file filter with the query.

 

Method Summary
boolean	accept(java.io.File f)           Apply the WHERE clause of the statement to the java.io.File passed in.
boolean	accept(java.lang.Object o)
java.lang.Class	getExpectedClass()           Always returns java.io.File.

 

Methods inherited from class org.josql.filters.AbstractJoSQLFilter

getException, getQuery, setQuery, setQuery

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

JoSQLFileFilter

public JoSQLFileFilter(java.lang.String q)
                throws org.josql.QueryParseException

Init this file filter with the query.

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JoSQLFileFilter

public JoSQLFileFilter(org.josql.Query q)
                throws java.lang.IllegalStateException,
                       org.josql.QueryParseException

Init this file filter with the query already built and parsed.

Method Detail

accept

public boolean accept(java.lang.Object o)

Specified by:

accept in class AbstractJoSQLFilter

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accept

public boolean accept(java.io.File f)

Apply the WHERE clause of the statement to the java.io.File 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 File objects). You can get access to exception by using: AbstractJoSQLFilter.getException() 55 .

Specified by:

accept in interface java.io.FileFilter

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getExpectedClass

public java.lang.Class getExpectedClass()

Always returns java.io.File.

Specified by:

getExpectedClass in class AbstractJoSQLFilter

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