Scala (Play 2.7.x)

java.lang.Object
- play.libs.Scala

```
public class Scala
extends java.lang.Object
```
Class that contains useful java <-> scala conversion helpers.

Constructor Summary

Constructors
Constructor and Description

Scala()

Constructors
Constructor and Description
`Scala()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <T> T[]`	`asArray(java.lang.Class<T> clazz, scala.collection.Seq<T> scalaList)` Converts a Scala List to an Array.
`static <K,V> java.util.Map<K,V>`	`asJava(scala.collection.Map<K,V> scalaMap)` Converts a Scala Map to Java.
`static <T> java.util.List<T>`	`asJava(scala.collection.Seq<T> scalaList)` Converts a Scala List to Java.
`static <A,B> F.Tuple<A,B>`	`asJava(scala.Tuple2<A,B> tuple)` Converts a scala `Tuple2` to a java F.Tuple.
`static <A> scala.Function0<A>`	`asScala(java.util.concurrent.Callable<A> callable)` Converts a Java Callable to a Scala Function0.
`static <A> scala.collection.immutable.Seq<A>`	`asScala(java.util.Collection<A> javaCollection)` Converts a Java Collection to a Scala Seq.
`static <K,V> scala.collection.immutable.Map<K,V>`	`asScala(java.util.Map<K,V> javaMap)` Converts a Java Map to Scala.
`static <A> scala.Function0<scala.concurrent.Future<A>>`	`asScalaWithFuture(java.util.concurrent.Callable<java.util.concurrent.CompletionStage<A>> callable)` Converts a Java Callable to a Scala Function0.
`static <C> scala.reflect.ClassTag<C>`	`classTag()`
`static <A,B> scala.collection.immutable.Map<A,B>`	`emptyMap()`
`static <T> scala.collection.Seq<T>`	`emptySeq()`
`static java.lang.RuntimeException`	`noMatch()` Throw this exception to indicate that a partial function doesn't match.
`static <T> scala.Option<T>`	`None()`
`static <T> scala.Option<T>`	`Option(T t)` Wrap a value into a Scala Option.
`static <T> T`	`orElse(scala.Option<T> opt, T defaultValue)` Wraps a Scala Option, handling None by returning a defaultValue
`static <T> T`	`orNull(scala.Option<T> opt)` Wraps a Scala Option, handling None as null.
`static <A,B> scala.PartialFunction<A,B>`	`partialFunction(java.util.function.Function<A,B> f)` Create a Scala PartialFunction from a function.
`static <T> scala.collection.immutable.Seq<T>`	`toSeq(java.util.List<T> list)` Converts a Java List to Scala Seq.
`static <T> scala.collection.immutable.Seq<T>`	`toSeq(T[] array)` Converts a Java Array to Scala Seq.
`static <A,B> scala.Tuple2<A,B>`	`Tuple(A a, B b)` Creates a Scala `Tuple2`.
`static <T> scala.collection.immutable.Seq<T>`	`varargs(T... array)` Converts a Java varargs to Scala varargs.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Scala
```
public Scala()
```
- Method Detail
  - orNull
```
public static <T> T orNull(scala.Option<T> opt)
```
    Wraps a Scala Option, handling None as null.
    
    Type Parameters:
    
    T - the type in the Option.
    
    Parameters:
    
    opt - the scala option.
    
    Returns:
    
    the value of the option, or null if opt.isDefined is false.
  - orElse
```
public static <T> T orElse(scala.Option<T> opt,
                           T defaultValue)
```
    Wraps a Scala Option, handling None by returning a defaultValue
    
    Type Parameters:
    
    T - the type in the Option.
    
    Parameters:
    
    opt - the scala option.
    
    defaultValue - the default value if None is found.
    
    Returns:
    
    the return value.
  - asJava
```
public static <K,V> java.util.Map<K,V> asJava(scala.collection.Map<K,V> scalaMap)
```
    Converts a Scala Map to Java.
    
    Type Parameters:
    
    K - key type
    
    V - value type
    
    Parameters:
    
    scalaMap - the scala map.
    
    Returns:
    
    the java map.
  - asScala
```
public static <K,V> scala.collection.immutable.Map<K,V> asScala(java.util.Map<K,V> javaMap)
```
    Converts a Java Map to Scala.
    
    Type Parameters:
    
    K - key type
    
    V - value type
    
    Parameters:
    
    javaMap - the java map
    
    Returns:
    
    the scala map.
  - asScala
```
public static <A> scala.collection.immutable.Seq<A> asScala(java.util.Collection<A> javaCollection)
```
    Converts a Java Collection to a Scala Seq.
    
    Type Parameters:
    
    A - the type of Seq element
    
    Parameters:
    
    javaCollection - the java collection
    
    Returns:
    
    the scala Seq.
  - asScala
```
public static <A> scala.Function0<A> asScala(java.util.concurrent.Callable<A> callable)
```
    Converts a Java Callable to a Scala Function0.
    
    Type Parameters:
    
    A - the return type.
    
    Parameters:
    
    callable - the java callable.
    
    Returns:
    
    the scala function.
  - asScalaWithFuture
```
public static <A> scala.Function0<scala.concurrent.Future<A>> asScalaWithFuture(java.util.concurrent.Callable<java.util.concurrent.CompletionStage<A>> callable)
```
    Converts a Java Callable to a Scala Function0.
    
    Type Parameters:
    
    A - the return type.
    
    Parameters:
    
    callable - the java callable.
    
    Returns:
    
    the scala function in a Scala Future.
  - asJava
```
public static <T> java.util.List<T> asJava(scala.collection.Seq<T> scalaList)
```
    Converts a Scala List to Java.
    
    Type Parameters:
    
    T - the return type.
    
    Parameters:
    
    scalaList - the scala list.
    
    Returns:
    
    the java list
  - asArray
```
public static <T> T[] asArray(java.lang.Class<T> clazz,
                              scala.collection.Seq<T> scalaList)
```
    Converts a Scala List to an Array.
    
    Type Parameters:
    
    T - the return type.
    
    Parameters:
    
    clazz - the element class type
    
    scalaList - the scala list.
    
    Returns:
    
    the array
  - Option
```
public static <T> scala.Option<T> Option(T t)
```
    Wrap a value into a Scala Option.
    
    Type Parameters:
    
    T - the element type.
    
    Parameters:
    
    t - the java value.
    
    Returns:
    
    the converted Option.
  - None
```
public static <T> scala.Option<T> None()
```
    Type Parameters:
    
    T - the type parameter
    
    Returns:
    
    a scala None.
  - Tuple
```
public static <A,B> scala.Tuple2<A,B> Tuple(A a,
                                            B b)
```
    Creates a Scala Tuple2.
    
    Type Parameters:
    
    A - input parameter type
    
    B - return type.
    
    Parameters:
    
    a - element one of the tuple.
    
    b - element two of the tuple.
    
    Returns:
    
    an instance of Tuple2 with the elements.
  - asJava
```
public static <A,B> F.Tuple<A,B> asJava(scala.Tuple2<A,B> tuple)
```
    Converts a scala Tuple2 to a java F.Tuple.
    
    Type Parameters:
    
    A - input parameter type
    
    B - return type.
    
    Parameters:
    
    tuple - the Scala Tuple.
    
    Returns:
    
    an instance of Tuple with the elements.
  - emptySeq
```
public static <T> scala.collection.Seq<T> emptySeq()
```
    Type Parameters:
    
    T - the type parameter
    
    Returns:
    
    an empty Scala Seq.
  - emptyMap
```
public static <A,B> scala.collection.immutable.Map<A,B> emptyMap()
```
    Type Parameters:
    
    A - input parameter type
    
    B - return type.
    
    Returns:
    
    an empty Scala Map.
  - classTag
```
public static <C> scala.reflect.ClassTag<C> classTag()
```
    Type Parameters:
    
    C - the classtag's type.
    
    Returns:
    
    an any ClassTag typed according to the Java compiler as C.
  - partialFunction
```
public static <A,B> scala.PartialFunction<A,B> partialFunction(java.util.function.Function<A,B> f)
```
    Create a Scala PartialFunction from a function.
    A PartialFunction is one that isn't defined for the whole of its domain. If the function isn't defined for a particular input parameter, it can throw F.noMatch(), and this will be translated into the semantics of a Scala PartialFunction.
    For example:
```
     Flow<String, Integer, ?> collectInts = Flow.<String>collect(Scala.partialFunction( str -> {
         try {
             return Integer.parseInt(str);
         } catch (NumberFormatException e) {
             throw Scala.noMatch();
         }
     }));
 
```
    The above code will convert a flow of String into a flow of Integer, dropping any strings that can't be parsed as integers.
    Type Parameters:
    
    A - input parameter type
    
    B - return type.
    
    Parameters:
    
    f - The function to make a partial function from.
    
    Returns:
    
    a Scala PartialFunction.
  - noMatch
```
public static java.lang.RuntimeException noMatch()
```
    Throw this exception to indicate that a partial function doesn't match.
    
    Returns:
    
    An exception that indicates a partial function doesn't match.
  - toSeq
```
public static <T> scala.collection.immutable.Seq<T> toSeq(java.util.List<T> list)
```
    Converts a Java List to Scala Seq.
    
    Type Parameters:
    
    T - the element type.
    
    Parameters:
    
    list - the java list.
    
    Returns:
    
    the converted Seq.
  - toSeq
```
public static <T> scala.collection.immutable.Seq<T> toSeq(T[] array)
```
    Converts a Java Array to Scala Seq.
    
    Type Parameters:
    
    T - the element type.
    
    Parameters:
    
    array - the java array.
    
    Returns:
    
    the converted Seq.
  - varargs
```
@SafeVarargs
public static <T> scala.collection.immutable.Seq<T> varargs(T... array)
```
    Converts a Java varargs to Scala varargs.
    
    Type Parameters:
    
    T - the element type.
    
    Parameters:
    
    array - the java array.
    
    Returns:
    
    the Scala varargs

Class Scala

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Scala

Method Detail

orNull

orElse

asJava

asScala

asScala

asScala

asScalaWithFuture

asJava

asArray

Option

None

Tuple

asJava

emptySeq

emptyMap

classTag

partialFunction

noMatch

toSeq

toSeq

varargs