cascading.operation
Class Debug

java.lang.Object
  cascading.operation.BaseOperation<Long>
      cascading.operation.Debug

All Implemented Interfaces:

Filter<Long>, Operation<Long>, Serializable

public class Debug
extends BaseOperation<Long>
implements Filter<Long>

Class Debug is a Filter that will never remove an item from a stream, but will print the Tuple to either stdout or stderr.

Currently, if printFields is true, they will print every 10 Tuples.

The frequency that fields and tuples are printed can be set via setPrintFieldsEvery(int) and setPrintTupleEvery(int) methods, respectively.

See Also:

Serialized Form

Nested Class Summary

static class

Debug.Output

Field Summary

Fields inherited from class cascading.operation.BaseOperation

fieldDeclaration, numArgs, trace

Fields inherited from interface cascading.operation.Operation

ANY

Constructor Summary

Debug()
Constructor Debug creates a new Debug instance that prints to stderr by default, and does not print the Tuple instance field names.

Debug(boolean printFields)
Constructor Debug creates a new Debug instance that prints to stderr and will print the current Tuple instance field names if printFields is true.

Debug(Debug.Output output)
Constructor Debug creates a new Debug instance that prints to the declared stream and does not print the Tuple field names.

Debug(Debug.Output output, boolean printFields)
Constructor Debug creates a new Debug instance that prints to the declared stream and will print the Tuple instances field names if printFields is true.

Debug(Debug.Output output, String prefix)
Constructor Debug creates a new Debug instance that prints to the declared stream and does not print the Tuple field names.

Debug(Debug.Output output, String prefix, boolean printFields)
Constructor Debug creates a new Debug instance that prints to the declared stream and will print the Tuple instances field names if printFields is true.

Debug(String prefix)
Constructor Debug creates a new Debug instance that prints to stderr by default, and does not print the Tuple instance field names.

Debug(String prefix, boolean printFields)
Constructor Debug creates a new Debug instance that prints to stderr and will print the current Tuple instance field names if printFields is true.

Method Summary

int	getPrintFieldsEvery() Method getPrintFieldsEvery returns the printFieldsEvery interval value of this Debug object.
int	getPrintTupleEvery() Method getPrintTupleEvery returns the printTupleEvery interval value of this Debug object.
boolean	isRemove(FlowProcess flowProcess, FilterCall<Long> filterCall) Method isRemove returns true if input should be removed from the tuple stream.
void	prepare(FlowProcess flowProcess, OperationCall<Long> operationCall) Method prepare does nothing, and may safely be overridden.
void	setPrintFieldsEvery(int printFieldsEvery) Method setPrintFieldsEvery sets the printFieldsEvery interval value of this Debug object.
void	setPrintTupleEvery(int printTupleEvery) Method setPrintTupleEvery sets the printTupleEvery interval value of this Debug object.

Methods inherited from class cascading.operation.BaseOperation

cleanup, getFieldDeclaration, getNumArgs, getTrace, printOperationInternal, toString, toStringInternal

Methods inherited from class java.lang.Object

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

Methods inherited from interface cascading.operation.Operation

cleanup, getFieldDeclaration, getNumArgs

Constructor Detail

Debug

public Debug()

Constructor Debug creates a new Debug instance that prints to stderr by default, and does not print the Tuple instance field names.

Debug

public Debug(String prefix)

Constructor Debug creates a new Debug instance that prints to stderr by default, and does not print the Tuple instance field names.

Parameters:

prefix - of type String

Debug

public Debug(String prefix,
             boolean printFields)

Constructor Debug creates a new Debug instance that prints to stderr and will print the current Tuple instance field names if printFields is true.

Parameters:

prefix - of type String

printFields - of type boolean

Debug

public Debug(boolean printFields)

Constructor Debug creates a new Debug instance that prints to stderr and will print the current Tuple instance field names if printFields is true.

Parameters:

printFields - of type boolean

Debug

public Debug(Debug.Output output)

Constructor Debug creates a new Debug instance that prints to the declared stream and does not print the Tuple field names.

Parameters:

output - of type Output

Debug

public Debug(Debug.Output output,
             String prefix)

Constructor Debug creates a new Debug instance that prints to the declared stream and does not print the Tuple field names.

Parameters:

output - of type Output

prefix - of type String

Debug

public Debug(Debug.Output output,
             String prefix,
             boolean printFields)

Constructor Debug creates a new Debug instance that prints to the declared stream and will print the Tuple instances field names if printFields is true.

Parameters:

output - of type Output

prefix - of type String

printFields - of type boolean

Debug

public Debug(Debug.Output output,
             boolean printFields)

Constructor Debug creates a new Debug instance that prints to the declared stream and will print the Tuple instances field names if printFields is true.

Parameters:

output - of type Output

printFields - of type boolean

Method Detail

getPrintFieldsEvery

public int getPrintFieldsEvery()

Method getPrintFieldsEvery returns the printFieldsEvery interval value of this Debug object.

Returns:

the printFieldsEvery (type int) of this Debug object.

setPrintFieldsEvery

public void setPrintFieldsEvery(int printFieldsEvery)

Method setPrintFieldsEvery sets the printFieldsEvery interval value of this Debug object.

Parameters:

printFieldsEvery - the printFieldsEvery of this Debug object.

getPrintTupleEvery

public int getPrintTupleEvery()

Method getPrintTupleEvery returns the printTupleEvery interval value of this Debug object.

Returns:

the printTupleEvery (type int) of this Debug object.

setPrintTupleEvery

public void setPrintTupleEvery(int printTupleEvery)

Method setPrintTupleEvery sets the printTupleEvery interval value of this Debug object.

Parameters:

printTupleEvery - the printTupleEvery of this Debug object.

prepare

public void prepare(FlowProcess flowProcess,
                    OperationCall<Long> operationCall)

Description copied from class: BaseOperation

Method prepare does nothing, and may safely be overridden.

Specified by:

prepare in interface Operation<Long>

Overrides:

prepare in class BaseOperation<Long>

isRemove

public boolean isRemove(FlowProcess flowProcess,
                        FilterCall<Long> filterCall)

Description copied from interface: Filter

Method isRemove returns true if input should be removed from the tuple stream.

Specified by:

isRemove in interface Filter<Long>

Parameters:

flowProcess - of type FlowProcess

filterCall - of type FilterCall

Returns:

boolean

See Also:

Filter.isRemove(cascading.flow.FlowProcess, FilterCall)