Class BigDecimalCombiner
- java.lang.Object
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- org.apache.accumulo.core.iterators.WrappingIterator
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- org.apache.accumulo.core.iterators.Combiner
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- org.apache.accumulo.core.iterators.TypedValueCombiner<BigDecimal>
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- org.apache.accumulo.core.iterators.user.BigDecimalCombiner
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- 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.
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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
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Nested classes/interfaces inherited from class org.apache.accumulo.core.iterators.Combiner
Combiner.ValueIterator
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Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber
OptionDescriber.IteratorOptions
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Field Summary
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Fields inherited from class org.apache.accumulo.core.iterators.TypedValueCombiner
LOSSY
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Fields inherited from class org.apache.accumulo.core.iterators.Combiner
ALL_OPTION, COLUMNS_OPTION, REDUCE_ON_FULL_COMPACTION_ONLY_OPTION
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Constructor Summary
Constructors Constructor Description BigDecimalCombiner()
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Method Summary
All Methods Instance Methods Concrete Methods 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
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Methods inherited from class org.apache.accumulo.core.iterators.Combiner
getTopKey, getTopValue, hasTop, next, seek, setColumns, setCombineAllColumns, setReduceOnFullCompactionOnly
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Methods inherited from class org.apache.accumulo.core.iterators.WrappingIterator
getSource, setSource
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.accumulo.core.iterators.YieldingKeyValueIterator
enableYielding
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Method Detail
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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 interfaceSortedKeyValueIterator<Key,Value>
- Overrides:
init
in classTypedValueCombiner<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.- Throws:
IOException
- unused.
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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 interfaceOptionDescriber
- Overrides:
describeOptions
in classTypedValueCombiner<BigDecimal>
- Returns:
- an iterator options object
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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 interfaceOptionDescriber
- Overrides:
validateOptions
in classTypedValueCombiner<BigDecimal>
- Parameters:
options
- a map of option names to option values- Returns:
- true if options are valid, false otherwise (IllegalArgumentException preferred)
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