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java.lang.Objectorg.apache.accumulo.core.iterators.WrappingIterator
org.apache.accumulo.core.iterators.user.VersioningIterator
public class VersioningIterator
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from interface org.apache.accumulo.core.iterators.OptionDescriber |
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OptionDescriber.IteratorOptions |
| Field Summary | |
|---|---|
protected int |
maxVersions
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| Constructor Summary | |
|---|---|
VersioningIterator()
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| Method Summary | |
|---|---|
VersioningIterator |
deepCopy(IteratorEnvironment env)
Creates a deep copy of this iterator as though seek had not yet been called. |
OptionDescriber.IteratorOptions |
describeOptions()
Gets an iterator options object that contains information needed to configure this iterator. |
boolean |
hasTop()
Returns true if the iterator has more elements. |
void |
init(SortedKeyValueIterator<Key,Value> source,
Map<String,String> options,
IteratorEnvironment env)
Initializes the iterator. |
void |
next()
Advances to the next K,V pair. |
void |
seek(Range range,
Collection<ByteSequence> columnFamilies,
boolean inclusive)
Seeks to the first key in the Range, restricting the resulting K,V pairs to those with the specified columns. |
static void |
setMaxVersions(IteratorSetting cfg,
int maxVersions)
Encode the maximum number of versions to return onto the ScanIterator |
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.WrappingIterator |
|---|
getSource, getTopKey, getTopValue, setSource |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
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protected int maxVersions
| Constructor Detail |
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public VersioningIterator()
| Method Detail |
|---|
public VersioningIterator deepCopy(IteratorEnvironment env)
SortedKeyValueIterator
deepCopy in interface SortedKeyValueIterator<Key,Value>deepCopy in class WrappingIteratorenv - IteratorEnvironment environment in which iterator is being run.
public void next()
throws IOException
SortedKeyValueIterator
next in interface SortedKeyValueIterator<Key,Value>next in class WrappingIteratorIOException - if an I/O error occurs.public boolean hasTop()
SortedKeyValueIterator
hasTop in interface SortedKeyValueIterator<Key,Value>hasTop in class WrappingIterator
public void seek(Range range,
Collection<ByteSequence> columnFamilies,
boolean inclusive)
throws IOException
SortedKeyValueIterator
seek in interface SortedKeyValueIterator<Key,Value>seek in class WrappingIteratorrange - Range of keys to iterate over.columnFamilies - Collection of column families to include or exclude.inclusive - boolean that indicates whether to include (true) or exclude (false) column families.
IOException - if an I/O error occurs.
public void init(SortedKeyValueIterator<Key,Value> source,
Map<String,String> options,
IteratorEnvironment env)
throws IOException
SortedKeyValueIterator
init in interface SortedKeyValueIterator<Key,Value>init in class WrappingIteratorsource - 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.
IOException - unused.public OptionDescriber.IteratorOptions describeOptions()
OptionDescriber
describeOptions in interface OptionDescriberpublic boolean validateOptions(Map<String,String> options)
OptionDescriber
validateOptions in interface OptionDescriberoptions - a map of option names to option values
public static void setMaxVersions(IteratorSetting cfg,
int maxVersions)
cfg - maxVersions -
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