Package org.apache.accumulo.core.iterators.user

Class BigDecimalCombiner

java.lang.Object

org.apache.accumulo.core.iterators.WrappingIterator

org.apache.accumulo.core.iterators.Combiner

org.apache.accumulo.core.iterators.TypedValueCombiner<BigDecimal>

org.apache.accumulo.core.iterators.user.BigDecimalCombiner

All Implemented Interfaces:

OptionDescriber, SortedKeyValueIterator<Key,Value>, YieldingKeyValueIterator<Key,Value>

Direct Known Subclasses:

BigDecimalCombiner.BigDecimalMaxCombiner, BigDecimalCombiner.BigDecimalMinCombiner, BigDecimalCombiner.BigDecimalSummingCombiner

public abstract class BigDecimalCombiner
extends TypedValueCombiner<BigDecimal>

A family of combiners that treat values as BigDecimals, encoding and decoding using the built-in BigDecimal String input/output functions.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BigDecimalCombiner.BigDecimalEncoder	Provides the ability to encode scientific notation.
static class	BigDecimalCombiner.BigDecimalMaxCombiner
static class	BigDecimalCombiner.BigDecimalMinCombiner
static class	BigDecimalCombiner.BigDecimalSummingCombiner

Nested classes/interfaces inherited from class org.apache.accumulo.core.iterators.Combiner

Combiner.ValueIterator

Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber

OptionDescriber.IteratorOptions

Field Summary

Fields inherited from class org.apache.accumulo.core.iterators.TypedValueCombiner

LOSSY

Fields inherited from class org.apache.accumulo.core.iterators.Combiner

ALL_OPTION, COLUMNS_OPTION, REDUCE_ON_FULL_COMPACTION_ONLY_OPTION

Constructor Summary

Constructors

Constructor	Description
BigDecimalCombiner()

Method Summary

Modifier and Type	Method	Description
OptionDescriber.IteratorOptions	describeOptions()	Gets an iterator options object that contains information needed to configure this iterator.
void	init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options, IteratorEnvironment env)	Initializes the iterator.
boolean	validateOptions(Map<String,String> options)	Check to see if an options map contains all options required by an iterator and that the option values are in the expected formats.

Methods inherited from class org.apache.accumulo.core.iterators.TypedValueCombiner

deepCopy, reduce, setEncoder, setEncoder, setLossyness, testEncoder, testEncoder, typedReduce

Methods inherited from class org.apache.accumulo.core.iterators.Combiner

getTopKey, getTopValue, hasTop, next, seek, setColumns, setCombineAllColumns, setReduceOnFullCompactionOnly

Methods inherited from class org.apache.accumulo.core.iterators.WrappingIterator

getSource, setSource

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.accumulo.core.iterators.YieldingKeyValueIterator

enableYielding

Constructor Details

BigDecimalCombiner

public BigDecimalCombiner()

Method Details

init

public void init(SortedKeyValueIterator<Key,Value> source,
 Map<String,String> options,
 IteratorEnvironment env)
          throws IOException

Description copied from interface: SortedKeyValueIterator

Initializes the iterator. Data should not be read from the source in this method.

Specified by:

init in interface SortedKeyValueIterator<Key,Value>

Overrides:

init in class TypedValueCombiner<BigDecimal>

Parameters:

source - SortedKeyValueIterator source to read data from.

options - Map map of string option names to option values.

env - IteratorEnvironment environment in which iterator is being run, provided by Accumulo itself and is expected to be non-null.

Throws:

IOException - unused.

describeOptions

public OptionDescriber.IteratorOptions describeOptions()

Description copied from interface: OptionDescriber

Gets an iterator options object that contains information needed to configure this iterator. This object will be used by the accumulo shell to prompt the user to input the appropriate information.

Specified by:

describeOptions in interface OptionDescriber

Overrides:

describeOptions in class TypedValueCombiner<BigDecimal>

Returns:

an iterator options object

validateOptions

public boolean validateOptions(Map<String,String> options)

Description copied from interface: OptionDescriber

Check to see if an options map contains all options required by an iterator and that the option values are in the expected formats.

Specified by:

validateOptions in interface OptionDescriber

Overrides:

validateOptions in class TypedValueCombiner<BigDecimal>

Parameters:

options - a map of option names to option values

Returns:

true if options are valid, false otherwise (IllegalArgumentException preferred)