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
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
Modifier and TypeClassDescriptionstatic class
Provides the ability to encode scientific notation.static class
static class
static class
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
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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
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionGets 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
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Constructor Details
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BigDecimalCombiner
public BigDecimalCombiner()
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Method Details
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init
public void init(SortedKeyValueIterator<Key, Value> source, Map<String, throws IOExceptionString> options, IteratorEnvironment env) 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, provided by Accumulo itself and is expected to be non-null.- Throws:
IOException
- unused.
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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
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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