gr.uoa.di.madgik.searchlibrary.operatorlibrary.google
Class GoogleOp

java.lang.Object
  gr.uoa.di.madgik.searchlibrary.operatorlibrary.google.GoogleOp

public class GoogleOp
extends Object

Operator class used to perform external lookups to the Google engine and create a org.gcube.searchservice.searchlibrary.resultset.ResultSet with the results

Author:

UoA

Field Summary

static String	ObjectIdFieldNameDef The default name for the Field of the object id
static String	PayloadFieldNameDef The default name for the Field of the payload
static long	TimeoutDef The default timeout used by the IRecordWriter.
static TimeUnit	TimeUnitDef The default timeout unit used by the RecordWriter.

Constructor Summary

GoogleOp(long timeout, TimeUnit timeUnit, StatsContainer stats)
Creates a new GoogleOp with the default field names for object id and payload

GoogleOp(StatsContainer stats)
Creates a new GoogleOp with the default timeout and the default field names for object id and payload

GoogleOp(String objectIdFieldName, String payloadFieldName, long timeout, TimeUnit timeUnit, StatsContainer stats)
Creates a new GoogleOp with configurable timeout and field names for object id and payload

Method Summary

URI	compute(String query, int resNo) Performs the external lookup

Methods inherited from class java.lang.Object

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

Field Detail

ObjectIdFieldNameDef

public static String ObjectIdFieldNameDef

The default name for the Field of the object id

PayloadFieldNameDef

public static String PayloadFieldNameDef

The default name for the Field of the payload

TimeoutDef

public static final long TimeoutDef

The default timeout used by the IRecordWriter. Currently set to 60.

See Also:

Constant Field Values

TimeUnitDef

public static final TimeUnit TimeUnitDef

The default timeout unit used by the RecordWriter. The current default unit is seconds.

Constructor Detail

GoogleOp

public GoogleOp(StatsContainer stats)

Creates a new GoogleOp with the default timeout and the default field names for object id and payload

Parameters:

stats - Statistics

GoogleOp

public GoogleOp(long timeout,
                TimeUnit timeUnit,
                StatsContainer stats)

Creates a new GoogleOp with the default field names for object id and payload

Parameters:

timeUnit - The time unit of the timeout

stats - Statistics

GoogleOp

public GoogleOp(String objectIdFieldName,
                String payloadFieldName,
                long timeout,
                TimeUnit timeUnit,
                StatsContainer stats)

Creates a new GoogleOp with configurable timeout and field names for object id and payload

Parameters:

objectIdFieldName - The name of the Field which will hold the object id

payloadFieldName - The name of the Field which will hold the payload

timeout - The timeout which will be used by the writer

timeUnit - The time unit of the timeout

stats - Statistics

Method Detail

compute

public URI compute(String query,
                   int resNo)
            throws Exception

Performs the external lookup

Parameters:

type - The type of resource to create

query - Teh query string

resNo - number of results

Returns:

The output org.gcube.searchservice.searchlibrary.resultset.ResultSet

Throws:

Exception - An unrecoverable for the operation error occurred