gr.uoa.di.madgik.searchlibrary.operatorlibrary.filter
Class FilterOp

java.lang.Object
  gr.uoa.di.madgik.searchlibrary.operatorlibrary.filter.FilterOp

public class FilterOp
extends Object

Operator class used to perform an xPath based filtering operation on its input org.gcube.searchservice.searchlibrary.resultset.ResultSet and produce a new org.gcube.searchservice.searchlibrary.resultset.ResultSet output holding the passing records

Author:

UoA

Constructor Summary

FilterOp(URI inLocator, String payloadFieldName, StatsContainer stats)
Creates a new FilterOp with the default timeout for the reader and the writer

FilterOp(URI inLocator, String payloadFieldName, StatsContainer stats, long timeout, TimeUnit timeUnit)
Creates a new FilterOp with configurable timeout for the reader and the writer

Method Summary

URI	compute(String xPath) Performs the filtering operation

Methods inherited from class java.lang.Object

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

Constructor Detail

FilterOp

public FilterOp(URI inLocator,
                String payloadFieldName,
                StatsContainer stats)

Creates a new FilterOp with the default timeout for the reader and the writer

Parameters:

locator - The locator of the input

payloadFieldName - The name of the Field which contains the payload to apply the filtering operation on

stats - Statistics

FilterOp

public FilterOp(URI inLocator,
                String payloadFieldName,
                StatsContainer stats,
                long timeout,
                TimeUnit timeUnit)

Creates a new FilterOp with configurable timeout for the reader and the writer

Parameters:

locator - The locator of the input

payloadFieldName - The name of the Field which contains the payload to apply the filtering operation on

stats - Statistics

timeout - The timeout to be used both by the reader and the writer

timeUnit - The time unit of the timeout used

Method Detail

compute

public URI compute(String xPath)
            throws Exception

Performs the filtering operation

Parameters:

xPath - The xpath expression to use

Returns:

The locator of the produced output

Throws:

Exception - An unrecoverable error for the operation occured