Package org.xmlunit.util
Class Linqy
- java.lang.Object
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- org.xmlunit.util.Linqy
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public final class Linqy extends java.lang.Object
A couple of (functional) sequence processing constructs.
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Nested Class Summary
Nested Classes Modifier and Type Class Description private static class
Linqy.FilteringIterator<T>
private static class
Linqy.MappingIterator<F,T>
private static class
Linqy.OnceOnlyIterator<E>
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Constructor Summary
Constructors Modifier Constructor Description private
Linqy()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static <T> boolean
all(java.lang.Iterable<T> sequence, Predicate<? super T> predicate)
Determines whether a given predicate holds true for all elements.static <T> boolean
any(java.lang.Iterable<T> sequence, Predicate<? super T> predicate)
Determines whether a given predicate holds true for at least one element.static <E> java.util.List<E>
asList(java.lang.Iterable<E> i)
Turns the iterable into a list.static <E> java.lang.Iterable<E>
cast(java.lang.Iterable i)
Turns an iterable into its type-safe cousin.static int
count(java.lang.Iterable seq)
Count the number of elements in a sequence.static <T> java.lang.Iterable<T>
filter(java.lang.Iterable<T> sequence, Predicate<? super T> filter)
Exclude all elements from an iterable that don't match a given predicate.static <F,T>
java.lang.Iterable<T>map(java.lang.Iterable<F> from, Mapper<? super F,T> mapper)
Create a new iterable by applying a mapper function to each element of a given sequence.static <E> java.lang.Iterable<E>
singleton(E single)
An iterable containing a single element.
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Method Detail
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asList
public static <E> java.util.List<E> asList(java.lang.Iterable<E> i)
Turns the iterable into a list.- Type Parameters:
E
- element type- Parameters:
i
- the iterable- Returns:
- a list containing all elements of the Iterable passed in
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cast
public static <E> java.lang.Iterable<E> cast(java.lang.Iterable i)
Turns an iterable into its type-safe cousin.- Type Parameters:
E
- target element type- Parameters:
i
- the iterable- Returns:
- a type-safe iterable containing all elements of the Iterable passed in
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singleton
public static <E> java.lang.Iterable<E> singleton(E single)
An iterable containing a single element.- Type Parameters:
E
- element type- Parameters:
single
- the element of the iterable to return- Returns:
- an Iterable returning
single
once and only once
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map
public static <F,T> java.lang.Iterable<T> map(java.lang.Iterable<F> from, Mapper<? super F,T> mapper)
Create a new iterable by applying a mapper function to each element of a given sequence.- Type Parameters:
F
- source element typeT
- target element type- Parameters:
from
- the iterable to transformmapper
- the function to apply to each element offrom
- Returns:
- an iterable where each element is the result of applying the function to an element of the original iterable
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filter
public static <T> java.lang.Iterable<T> filter(java.lang.Iterable<T> sequence, Predicate<? super T> filter)
Exclude all elements from an iterable that don't match a given predicate.- Type Parameters:
T
- element type- Parameters:
sequence
- the iterable to filterfilter
- the predicate to apply- Returns:
- an iterable containing all elements of the original sequence that match the predicate
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count
public static int count(java.lang.Iterable seq)
Count the number of elements in a sequence.- Parameters:
seq
- the sequence to count- Returns:
- the number of elements in the sequence
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any
public static <T> boolean any(java.lang.Iterable<T> sequence, Predicate<? super T> predicate)
Determines whether a given predicate holds true for at least one element.Returns false for an empty sequence.
- Type Parameters:
T
- element type- Parameters:
sequence
- the sequence to examinepredicate
- the predicate to test- Returns:
- true if any element of the sequence matches the predicate
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all
public static <T> boolean all(java.lang.Iterable<T> sequence, Predicate<? super T> predicate)
Determines whether a given predicate holds true for all elements.Returns true for an empty sequence.
- Type Parameters:
T
- element type- Parameters:
sequence
- the sequence to examinepredicate
- the predicate to test- Returns:
- true if all elements of the sequence match the predicate
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