org.codehaus.groovy.vmplugin.v8

Class PluginDefaultGroovyMethods

java.lang.Object

org.codehaus.groovy.vmplugin.v8.PluginDefaultGroovyMethods

public class PluginDefaultGroovyMethods
extends java.lang.Object

Defines new Groovy methods which appear on normal JDK 8 classes inside the Groovy environment.

Since:

2.5.0

Method Summary

Modifier and Type	Method and Description
static boolean	asBoolean(java.util.Optional<?> optional) Coerce an Optional instance to a boolean value.
static <S,T> java.util.concurrent.Future<T>	collect(java.util.concurrent.Future<S> self, Closure<T> transform) Returns a Future asynchronously returning a transformed result.
static <S,T> java.util.Optional<T>	collect(java.util.Optional<S> self, Closure<T> transform) If the optional contains a value, returns an optional containing the transformed value obtained using the transform closure or otherwise an empty optional.
static java.util.stream.Stream<java.lang.Boolean>	stream(boolean[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Byte>	stream(byte[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Character>	stream(char[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Double>	stream(double[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Float>	stream(float[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Integer>	stream(int[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Long>	stream(long[] self) Returns a sequential Stream with the specified array as its source.
static java.util.stream.Stream<java.lang.Short>	stream(short[] self) Returns a sequential Stream with the specified array as its source.
static <T> java.util.stream.Stream<T>	stream(T[] self) Returns a sequential Stream with the specified array as its source.
static <T> java.util.List<T>	toList(java.util.stream.BaseStream<T,? extends java.util.stream.BaseStream> stream) Accumulates the elements of stream into a new List.
static <T> java.util.List<T>	toList(java.util.stream.Stream<T> stream) Accumulates the elements of stream into a new List.
static <T> java.util.Set<T>	toSet(java.util.stream.BaseStream<T,? extends java.util.stream.BaseStream> stream) Accumulates the elements of stream into a new Set.
static <T> java.util.Set<T>	toSet(java.util.stream.Stream<T> stream) Accumulates the elements of stream into a new Set.

Methods inherited from class java.lang.Object

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

Method Detail

asBoolean

public static boolean asBoolean(java.util.Optional<?> optional)

Coerce an Optional instance to a boolean value.

Parameters:

optional - the Optional

Returns:

true if a value is present, otherwise false

collect

public static <S,T> java.util.Optional<T> collect(java.util.Optional<S> self,
                                                  Closure<T> transform)

If the optional contains a value, returns an optional containing the transformed value obtained using the transform closure or otherwise an empty optional.

 assert Optional.of("foobar").collect{ it.size() }.get() == 6
 assert !Optional.empty().collect{ it.size() }.isPresent()
 

Parameters:

self - an Optional

transform - the closure used to transform the optional value if present

Returns:

an Optional containing the transformed value or empty if the optional is empty or the transform returns null

collect

public static <S,T> java.util.concurrent.Future<T> collect(java.util.concurrent.Future<S> self,
                                                           Closure<T> transform)

Returns a Future asynchronously returning a transformed result.

 import java.util.concurrent.*
 def executor = Executors.newSingleThreadExecutor()
 Future foobar = executor.submit{ "foobar" }
 Future foobarSize = foobar.collect{ it.size() }
 assert foobarSize.get() == 6
 executor.shutdown()
 

Parameters:

self - a Future

transform - the closure used to transform the Future value

Returns:

a Future allowing the transformed value to be obtained asynchronously

toList

public static <T> java.util.List<T> toList(java.util.stream.Stream<T> stream)

Accumulates the elements of stream into a new List.

Type Parameters:

T - the type of element

Parameters:

stream - the Stream

Returns:

a new java.util.List instance

toSet

public static <T> java.util.Set<T> toSet(java.util.stream.Stream<T> stream)

Accumulates the elements of stream into a new Set.

Type Parameters:

T - the type of element

Parameters:

stream - the Stream

Returns:

a new java.util.Set instance

toList

public static <T> java.util.List<T> toList(java.util.stream.BaseStream<T,? extends java.util.stream.BaseStream> stream)

Accumulates the elements of stream into a new List.

Type Parameters:

T - the type of element

Parameters:

stream - the java.util.stream.BaseStream

Returns:

a new java.util.List instance

toSet

public static <T> java.util.Set<T> toSet(java.util.stream.BaseStream<T,? extends java.util.stream.BaseStream> stream)

Accumulates the elements of stream into a new Set.

Type Parameters:

T - the type of element

Parameters:

stream - the java.util.stream.BaseStream

Returns:

a new java.util.Set instance

stream

public static <T> java.util.stream.Stream<T> stream(T[] self)

Returns a sequential Stream with the specified array as its source.

Type Parameters:

T - The type of the array elements

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Integer> stream(int[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Long> stream(long[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Double> stream(double[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Character> stream(char[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Byte> stream(byte[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Short> stream(short[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Boolean> stream(boolean[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array

stream

public static java.util.stream.Stream<java.lang.Float> stream(float[] self)

Returns a sequential Stream with the specified array as its source.

Parameters:

self - The array, assumed to be unmodified during use

Returns:

a Stream for the array