cascading.operation.aggregator
Class Min

java.lang.Object
  cascading.operation.BaseOperation<ExtremaBase.Context>
      cascading.operation.aggregator.ExtremaBase
          cascading.operation.aggregator.Min

All Implemented Interfaces:

Aggregator<ExtremaBase.Context>, Operation<ExtremaBase.Context>, Serializable

public class Min
extends ExtremaBase

Class Min is an Aggregator that returns the minimum value encountered in the current group.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class cascading.operation.aggregator.ExtremaBase

ExtremaBase.Context

Field Summary

static String

FIELD_NAME Field FIELD_NAME

Fields inherited from class cascading.operation.aggregator.ExtremaBase

ignoreValues

Fields inherited from class cascading.operation.BaseOperation

fieldDeclaration, numArgs, trace

Fields inherited from interface cascading.operation.Operation

ANY

Constructor Summary

Min()
Constructs a new instance that returns the Min value encoutered in the field name "min".

Min(Fields fieldDeclaration)
Constructs a new instance that returns the minimum value encoutered in the given fieldDeclaration field name.

Min(Fields fieldDeclaration, Object... ignoreValues)
Constructs a new instance that returns the minimum value encoutered in the given fieldDeclaration field name.

Method Summary

protected boolean	compare(Number lhs, Number rhs)
protected double	getInitialValue()

Methods inherited from class cascading.operation.aggregator.ExtremaBase

aggregate, complete, getResult, start

Methods inherited from class cascading.operation.BaseOperation

cleanup, getFieldDeclaration, getNumArgs, getTrace, prepare, 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, prepare

Field Detail

FIELD_NAME

public static final String FIELD_NAME

Field FIELD_NAME

See Also:

Constant Field Values

Constructor Detail

Min

public Min()

Constructs a new instance that returns the Min value encoutered in the field name "min".

Min

public Min(Fields fieldDeclaration)

Constructs a new instance that returns the minimum value encoutered in the given fieldDeclaration field name.

Parameters:

fieldDeclaration - of type Fields

Min

public Min(Fields fieldDeclaration,
           Object... ignoreValues)

Constructs a new instance that returns the minimum value encoutered in the given fieldDeclaration field name. Any argument matching an ignoredValue won't be compared.

Parameters:

fieldDeclaration - of type Fields

ignoreValues - of type Object...

Method Detail

compare

protected boolean compare(Number lhs,
                          Number rhs)

Specified by:

compare in class ExtremaBase

getInitialValue

protected double getInitialValue()

Specified by:

getInitialValue in class ExtremaBase