public class StreamGroovyMethods extends Object
| Type Params | Return Type | Name and description | 
|---|---|---|
|  | public static DoubleStream | doubleStream(double[] self)Returns a sequential DoubleStream with the specified array as its source. | 
|  | public void | forEachRemaining(Consumer<? super T> action) | 
| <T> | public static Stream<T> | from(Stream<T> self, IntRange range)Returns a (possibly empty) stream. | 
| <T> | public static Stream<T> | from(Stream<T> self, EmptyRange range)Returns an empty stream. | 
| <T> | public static T | getAt(Stream<T> self, int index)Returns element at indexornull. | 
| <T> | public static List<T> | getAt(Stream<T> self, IntRange range)Returns element(s) in rangeor an empty list. | 
| <T> | public static List<T> | getAt(Stream<T> self, EmptyRange range)Returns an empty list. | 
|  | public static IntStream | intStream(int[] self)Returns a sequential IntStream with the specified array as its source. | 
|  | public static LongStream | longStream(long[] self)Returns a sequential LongStream with the specified array as its source. | 
| <T> | public static Stream<T> | plus(Stream<? extends T> lhs, Collection<? extends T> rhs)Returns a lazily concatenated stream whose elements are all the elements of this stream followed by all the elements of the Collection object. | 
| <T> | public static Stream<T> | plus(Stream<? extends T> lhs, Iterable<? extends T> rhs)Returns a lazily concatenated stream whose elements are all the elements of this stream followed by all the elements of the Iterable object. | 
| <T> | public static Stream<T> | plus(Stream<? extends T> lhs, Stream<? extends T> rhs)Returns a lazily concatenated stream whose elements are all the elements of this stream followed by all the elements of the second stream. | 
| <T> | public static Stream<T> | stream(T self)Returns a sequential Stream containing a single element. | 
| <T> | public static Stream<T> | stream(T[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Integer> | stream(int[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Long> | stream(long[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Double> | stream(double[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Character> | stream(char[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Byte> | stream(byte[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Short> | stream(short[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Boolean> | stream(boolean[] self)Returns a sequential Stream with the specified array as its source. | 
|  | public static Stream<Float> | stream(float[] self)Returns a sequential Stream with the specified array as its source. | 
| <T> | public static Stream<T> | stream(Enumeration<T> self)Returns a sequential Stream with the specified element(s) as its source. | 
| <T> | public static Stream<T> | stream(Iterable<T> self)Returns a sequential Stream with the specified element(s) as its source. | 
| <T> | public static Stream<T> | stream(Iterator<T> self)Returns a sequential Stream with the specified element(s) as its source. | 
| <T> | public static Stream<T> | stream(Spliterator<T> self)Returns a sequential Stream with the specified element(s) as its source. | 
| <T> | public static Stream<T> | stream(NullObject self)Returns an empty sequential Stream. | 
| <T> | public static Stream<T> | stream(Optional<T> self)If a value is present in the Optional, returns a Stream with the value as its source or else an empty stream. | 
|  | public static IntStream | stream(OptionalInt self)If a value is present in the OptionalInt, returns an IntStream with the value as its source or else an empty stream. | 
|  | public static LongStream | stream(OptionalLong self)If a value is present in the OptionalLong, returns a LongStream with the value as its source or else an empty stream. | 
|  | public static DoubleStream | stream(OptionalDouble self)If a value is present in the OptionalDouble, returns a DoubleStream with the value as its source or else an empty stream. | 
| <T> | public static T[] | toArray(Stream<? extends T> self, Class<T> type)Returns an array containing the elements of the stream. | 
| <T> | public static List<T> | toList(Stream<T> self)Accumulates the elements of stream into a new List. | 
| <T> | public static List<T> | toList(BaseStream<T, ? extends BaseStream> self)Accumulates the elements of stream into a new List. | 
| <T> | public static Set<T> | toSet(Stream<T> self)Accumulates the elements of stream into a new Set. | 
| <T> | public static Set<T> | toSet(BaseStream<T, ? extends BaseStream> self)Accumulates the elements of stream into a new Set. | 
|  | public boolean | tryAdvance(Consumer<? super T> action) | 
Returns a sequential DoubleStream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a (possibly empty) stream.
This is a short-circuiting intermediate operation.
 import java.util.stream.Stream
 import static groovy.test.GroovyAssert.shouldFail
 Stream<String> stream = ['foo','bar','baz'].stream()
 shouldFail(IllegalArgumentException) { stream.from(-1..0) }
 stream = ['foo','bar','baz'].stream()
 shouldFail(IllegalArgumentException) { stream.from(0..-1) }
 stream = ['foo','bar','baz'].stream()
 assert stream.from(0..<1).toList() == ['foo']
 stream = ['foo','bar','baz'].stream()
 assert stream.from(1..<2).toList() == ['bar']
 stream = ['foo','bar','baz'].stream()
 assert stream.from(2..<3).toList() == ['baz']
 stream = ['foo','bar','baz'].stream()
 assert stream.from(3..<4).toList() == []
 stream = ['foo','bar','baz'].stream()
 assert stream.from(0<..2).toList() == ['bar','baz']
 stream = ['foo','bar','baz'].stream()
 assert stream.from(0<..<2).toList() == ['bar']
 stream = ['foo','bar','baz'].stream()
 assert stream.from(0..99).toList() == ['foo','bar','baz']
 Returns an empty stream.
import java.util.stream.Stream Stream<String> stream = ['foo','bar','baz'].stream() assert !stream.from(1..<1).findAny().isPresent()
 Returns element at index or null.
 
This is a short-circuiting terminal operation.
import java.util.stream.Stream import static groovy.test.GroovyAssert.shouldFail Streamstream = ['foo','bar','baz'].stream() shouldFail(IllegalArgumentException) { stream[-1] } stream = ['foo','bar','baz'].stream() assert stream[0] == 'foo' stream = ['foo','bar','baz'].stream() assert stream[1] == 'bar' stream = ['foo','bar','baz'].stream() assert stream[2] == 'baz' stream = ['foo','bar','baz'].stream() assert stream[3] === null 
index is negative Returns element(s) in range or an empty list.
 
This is a short-circuiting terminal operation.
 import java.util.stream.Stream
 import static groovy.test.GroovyAssert.shouldFail
 Stream<String> stream = ['foo','bar','baz'].stream()
 shouldFail(IllegalArgumentException) { stream[-1..0] }
 stream = ['foo','bar','baz'].stream()
 shouldFail(IllegalArgumentException) { stream[0..-1] }
 stream = ['foo','bar','baz'].stream()
 assert stream[0..<1] == ['foo']
 stream = ['foo','bar','baz'].stream()
 assert stream[1..<2] == ['bar']
 stream = ['foo','bar','baz'].stream()
 assert stream[2..<3] == ['baz']
 stream = ['foo','bar','baz'].stream()
 assert stream[3..<4] == []
 stream = ['foo','bar','baz'].stream()
 assert stream[0<..2] == ['bar','baz']
 stream = ['foo','bar','baz'].stream()
 assert stream[0..99] == ['foo','bar','baz']
 Returns an empty list.
import java.util.stream.Stream Stream<String> stream = ['foo','bar','baz'].stream() assert stream[1..<1].isEmpty()
Returns a sequential IntStream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential LongStream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a lazily concatenated stream whose elements are all the elements of this stream followed by all the elements of the Collection object.
import java.util.stream.Stream assert (Stream.of(1) + [2]).toList() == [1,2] assert (Stream.of(1) + []).toList() == [1]
Returns a lazily concatenated stream whose elements are all the elements of this stream followed by all the elements of the Iterable object.
import java.util.stream.Stream assert (Stream.of(1) + [2]).toList() == [1,2] assert (Stream.of(1) + []).toList() == [1]
Returns a lazily concatenated stream whose elements are all the elements of this stream followed by all the elements of the second stream.
import java.util.stream.Stream assert (Stream.of(1) + Stream.<Integer>empty()).toList() == [1] assert (Stream.of(1) + Stream.of(2)).toList() == [1,2] assert (Stream.of(1) + [2].stream()).toList() == [1,2]
Returns a sequential Stream containing a single element.
def item = 'string' assert item.stream().toList() == ['string'] assert item.stream().findFirst().isPresent()
Returns a sequential Stream with the specified array as its source.
T -  The type of the array elementsself -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified array as its source.
self -  The array, assumed to be unmodified during useStream for the arrayReturns a sequential Stream with the specified element(s) as its source.
 def tokens = new StringTokenizer('one two')
 assert tokens.stream().toList() == ['one', 'two']
 
      Returns a sequential Stream with the specified element(s) as its source.
class Items implements Iterable{ Iterator<String> iterator() { ['one', 'two'].iterator() } } def items = new Items() assert items.stream().toList() == ['one', 'two'] 
Returns a sequential Stream with the specified element(s) as its source.
[].iterator().stream().toList().isEmpty() ['one', 'two'].iterator().stream().toList() == ['one', 'two']
Returns a sequential Stream with the specified element(s) as its source.
assert [].spliterator().stream().toList().isEmpty() assert ['one', 'two'].spliterator().stream().toList() == ['one', 'two']
Returns an empty sequential Stream.
def item = null assert item.stream().toList() == [] assert !item.stream().findFirst().isPresent()
If a value is present in the Optional, returns a Stream with the value as its source or else an empty stream.
If a value is present in the OptionalInt, returns an IntStream with the value as its source or else an empty stream.
If a value is present in the OptionalLong, returns a LongStream with the value as its source or else an empty stream.
If a value is present in the OptionalDouble, returns a DoubleStream with the value as its source or else an empty stream.
Returns an array containing the elements of the stream.
 import static groovy.test.GroovyAssert.shouldFail
 assert Arrays.equals([].stream().toArray(Object), new Object[0])
 assert Arrays.equals([].stream().toArray(String), new String[0])
 assert Arrays.equals([].stream().toArray(String[]), new String[0][])
 assert Arrays.equals(['x'].stream().toArray(Object), ['x'].toArray())
 assert Arrays.equals(['x'].stream().toArray(String), ['x'] as String[])
 assert Arrays.deepEquals([['x'] as String[]].stream().toArray(String[]), [['x'] as String[]] as String[][])
 assert Arrays.equals(['x'].stream().toArray(CharSequence), ['x'] as CharSequence[])
 shouldFail(ArrayStoreException) {
     ['x'].stream().toArray(Thread)
 }
 shouldFail(IllegalArgumentException) {
     ['x'].stream().toArray((Class) null)
 }
 // Stream#toArray(IntFunction) should still be used for closure literal:
 assert Arrays.equals(['x'].stream().toArray { n -> new String[n] }, ['x'] as String[])
 // Stream#toArray(IntFunction) should still be used for method reference:
 assert Arrays.equals(['x'].stream().toArray(String[]::new), ['x'] as String[])
 
      self -  the streamtype -  the array element typeAccumulates the elements of stream into a new List.
self -  the streamT -  the type of elementjava.util.List instanceAccumulates the elements of stream into a new List.
self -  the java.util.stream.BaseStreamT -  the type of elementjava.util.List instanceAccumulates the elements of stream into a new Set.
self -  the streamT -  the type of elementjava.util.Set instanceAccumulates the elements of stream into a new Set.
self -  the java.util.stream.BaseStreamT -  the type of elementjava.util.Set instance