org.apache.accumulo.core.iterators.user

Class GrepIterator

java.lang.Object

org.apache.accumulo.core.iterators.WrappingIterator

org.apache.accumulo.core.iterators.Filter

org.apache.accumulo.core.iterators.user.GrepIterator

All Implemented Interfaces:

OptionDescriber, SortedKeyValueIterator<Key,Value>

Direct Known Subclasses:

GrepIterator

public class GrepIterator
extends Filter

This iterator provides exact string matching. It searches both the Key and Value for the string. The string to match is specified by the "term" option.

Nested Class Summary

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.Filter

NEGATE

Constructor Summary

Constructors

Constructor and Description
GrepIterator()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	accept(Key k, Value v)
SortedKeyValueIterator<Key,Value>	deepCopy(IteratorEnvironment env) Creates a deep copy of this iterator as though seek had not yet been called.
void	init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options, IteratorEnvironment env) Initializes the iterator.
static void	setTerm(IteratorSetting cfg, String term) Encode the grep term as an option for a ScanIterator

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

describeOptions, findTop, next, seek, setNegate, validateOptions

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

getSource, getTopKey, getTopValue, hasTop, setSource

Methods inherited from class java.lang.Object

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

Constructor Detail

GrepIterator

public GrepIterator()

Method Detail

accept

public boolean accept(Key k,
             Value v)

Specified by:

accept in class Filter

Returns:

true if the key/value pair is accepted by the filter.

deepCopy

public SortedKeyValueIterator<Key,Value> deepCopy(IteratorEnvironment env)

Description copied from interface: SortedKeyValueIterator

Creates a deep copy of this iterator as though seek had not yet been called. init should be called on an iterator before deepCopy is called. init should not need to be called on the copy that is returned by deepCopy; that is, when necessary init should be called in the deepCopy method on the iterator it returns. The behavior is unspecified if init is called after deepCopy either on the original or the copy.

Specified by:

deepCopy in interface SortedKeyValueIterator<Key,Value>

Overrides:

deepCopy in class Filter

Parameters:

env - IteratorEnvironment environment in which iterator is being run.

Returns:

SortedKeyValueIterator a copy of this iterator (with the same source and settings).

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 Filter

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.

setTerm

public static void setTerm(IteratorSetting cfg,
           String term)

Encode the grep term as an option for a ScanIterator