org.apache.crunch.contrib.text
Class Extractors

java.lang.Object
  org.apache.crunch.contrib.text.Extractors

public final class Extractors
extends Object

Factory methods for constructing common Extractor types.

Constructor Summary

Extractors()

Method Summary

static Extractor<Boolean>	xboolean() Returns an Extractor for booleans.
static Extractor<Boolean>	xboolean(Boolean defaultValue)
static <T> Extractor<Collection<T>>	xcollect(TokenizerFactory scannerFactory, Extractor<T> extractor)
static <T extends Tuple> Extractor<T>	xcustom(Class<T> clazz, TokenizerFactory scannerFactory, Extractor... extractors) Returns an Extractor for a subclass of Tuple with a constructor that has the given extractor types that uses the given TokenizerFactory for parsing the sub-fields.
static Extractor<Double>	xdouble() Returns an Extractor for doubles.
static Extractor<Double>	xdouble(Double defaultValue)
static Extractor<Float>	xfloat() Returns an Extractor for floats.
static Extractor<Float>	xfloat(Float defaultValue)
static Extractor<Integer>	xint() Returns an Extractor for integers.
static Extractor<Integer>	xint(Integer defaultValue) Returns an Extractor for integers.
static Extractor<Long>	xlong() Returns an Extractor for longs.
static Extractor<Long>	xlong(Long defaultValue) Returns an Extractor for longs.
static <K,V> Extractor<Pair<K,V>>	xpair(TokenizerFactory scannerFactory, Extractor<K> one, Extractor<V> two) Returns an Extractor for pairs of the given types that uses the given TokenizerFactory for parsing the sub-fields.
static <A,B,C,D> Extractor<Tuple4<A,B,C,D>>	xquad(TokenizerFactory scannerFactory, Extractor<A> a, Extractor<B> b, Extractor<C> c, Extractor<D> d) Returns an Extractor for quads of the given types that uses the given TokenizerFactory for parsing the sub-fields.
static Extractor<String>	xstring() Returns an Extractor for strings.
static Extractor<String>	xstring(String defaultValue)
static <A,B,C> Extractor<Tuple3<A,B,C>>	xtriple(TokenizerFactory scannerFactory, Extractor<A> a, Extractor<B> b, Extractor<C> c) Returns an Extractor for triples of the given types that uses the given TokenizerFactory for parsing the sub-fields.
static Extractor<TupleN>	xtupleN(TokenizerFactory scannerFactory, Extractor... extractors) Returns an Extractor for an arbitrary number of types that uses the given TokenizerFactory for parsing the sub-fields.

Methods inherited from class java.lang.Object

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

Constructor Detail

Extractors

public Extractors()

Method Detail

xint

public static Extractor<Integer> xint()

Returns an Extractor for integers.

xint

public static Extractor<Integer> xint(Integer defaultValue)

Returns an Extractor for integers.

xlong

public static Extractor<Long> xlong()

Returns an Extractor for longs.

xlong

public static Extractor<Long> xlong(Long defaultValue)

Returns an Extractor for longs.

xfloat

public static Extractor<Float> xfloat()

Returns an Extractor for floats.

xfloat

public static Extractor<Float> xfloat(Float defaultValue)

xdouble

public static Extractor<Double> xdouble()

Returns an Extractor for doubles.

xdouble

public static Extractor<Double> xdouble(Double defaultValue)

xboolean

public static Extractor<Boolean> xboolean()

Returns an Extractor for booleans.

xboolean

public static Extractor<Boolean> xboolean(Boolean defaultValue)

xstring

public static Extractor<String> xstring()

Returns an Extractor for strings.

xstring

public static Extractor<String> xstring(String defaultValue)

xcollect

public static <T> Extractor<Collection<T>> xcollect(TokenizerFactory scannerFactory,
                                                    Extractor<T> extractor)

xpair

public static <K,V> Extractor<Pair<K,V>> xpair(TokenizerFactory scannerFactory,
                                               Extractor<K> one,
                                               Extractor<V> two)

Returns an Extractor for pairs of the given types that uses the given TokenizerFactory for parsing the sub-fields.

xtriple

public static <A,B,C> Extractor<Tuple3<A,B,C>> xtriple(TokenizerFactory scannerFactory,
                                                       Extractor<A> a,
                                                       Extractor<B> b,
                                                       Extractor<C> c)

Returns an Extractor for triples of the given types that uses the given TokenizerFactory for parsing the sub-fields.

xquad

public static <A,B,C,D> Extractor<Tuple4<A,B,C,D>> xquad(TokenizerFactory scannerFactory,
                                                         Extractor<A> a,
                                                         Extractor<B> b,
                                                         Extractor<C> c,
                                                         Extractor<D> d)

Returns an Extractor for quads of the given types that uses the given TokenizerFactory for parsing the sub-fields.

xtupleN

public static Extractor<TupleN> xtupleN(TokenizerFactory scannerFactory,
                                        Extractor... extractors)

Returns an Extractor for an arbitrary number of types that uses the given TokenizerFactory for parsing the sub-fields.

xcustom

public static <T extends Tuple> Extractor<T> xcustom(Class<T> clazz,
                                                     TokenizerFactory scannerFactory,
                                                     Extractor... extractors)

Returns an Extractor for a subclass of Tuple with a constructor that has the given extractor types that uses the given TokenizerFactory for parsing the sub-fields.