Package org.forgerock.openig.filter

Class FileAttributesFilter

java.lang.Object

org.forgerock.openig.filter.FileAttributesFilter

All Implemented Interfaces:

Filter

public class FileAttributesFilter
extends Object
implements Filter

Retrieves and exposes a record from a delimiter-separated file. Lookup of the record is performed using a specified key, whose value is derived from an expression. The resulting record is exposed in a Map object, whose location is specified by the target expression. If a matching record cannot be found, then the resulting map will be empty.

The retrieval of the record is performed lazily; it does not occur until the first attempt to access a value in the target. This defers the overhead of file operations and text processing until a value is first required. This also means that the value expression will not be evaluated until the map is first accessed.

See Also:

SeparatedValuesFile

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FileAttributesFilter.Heaplet	Creates and initializes a separated values file attribute provider in a heap environment.

Constructor Summary

Constructors

Constructor	Description
FileAttributesFilter(SeparatedValuesFile file, String key, Expression<String> value, LeftValueExpression<Map> target)	Builds a new FileAttributesFilter extracting values from the given separated values file.

Method Summary

Modifier and Type	Method	Description
Promise<Response,NeverThrowsException>	filter(Context context, Request request, Handler next)	Filters the request and/or response of an exchange.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileAttributesFilter

public FileAttributesFilter(SeparatedValuesFile file,
                            String key,
                            Expression<String> value,
                            LeftValueExpression<Map> target)

Builds a new FileAttributesFilter extracting values from the given separated values file.

Parameters:

file - The file to read separated values from (csv file)

key - The name of the field in the file to perform the lookup on

value - Expression that yields the value to be looked-up within the file

target - Expression that yields the target object that will contain the record

Method Detail

filter

public Promise<Response,NeverThrowsException> filter(Context context,
                                                           Request request,
                                                           Handler next)

Description copied from interface: Filter

Filters the request and/or response of an exchange. To pass the request to the next filter or handler in the chain, the filter calls next.handle(context, request).

This method may elect not to pass the request to the next filter or handler, and instead handle the request itself. It can achieve this by merely avoiding a call to next.handle(context, request) and creating its own response object. The filter is also at liberty to replace a response with another of its own by intercepting the response returned by the next handler.

Specified by:

filter in interface Filter

Parameters:

context - The request context.

request - The request.

next - The next filter or handler in the chain to handle the request.

Returns:

A Promise representing the response to be returned to the client.